Shallow Interval Soil Metal Sampling Platte to Park Hill 39 th Avenue Channel Project Area City and County of Denver, Colorado

Transcription

1 Page intentionally left blank to accommodate double-sided printing July 31, 2017 Shallow Interval Soil Metal Sampling Platte to Park Hill 39 th Avenue Channel Project Area City and County of Denver, Colorado Prepared for: City and County of Denver, Department of Environmental Health 200 West 14th Avenue, Suite 310 Denver, CO Pinyon Project No.: 1/

2 July 31, 2017 Shallow Interval Soil Metal Sampling Platte to Park Hill 39th Avenue Channel Project Area City and County of Denver, Colorado Prepared for: City and County of Denver, Department of Environmental Health 200 West 14th Avenue, Suite 310 Denver, CO Pinyon Project No.: 1/ Prepared by: Timothy R. Grenier, P.E. Environmental Engineer Reviewed by: Brian R. Partington Principal

3 Table of Contents 1. Introduction and Purpose... 1 Study Goals... 1 Previous Studies and Known Conditions Methods Results... 4 Soil Guidance, Cleanup, and Screening Values Arsenic Risk Management Guidance Values VB/I-70 Arsenic and Lead Cleanup Values Lead Regional Screening Levels Lead and Arsenic 20 Times Rule... 4 Soil Results Conclusions Recommendations ations References Tables Table 3-1 VB/I-70 Cleanup Value, EPA Regional Screening Value, or 20 Times Rule Exceedances... 5 Figures Figure 1 Figure 2 Site Location Boring Locations and Screening/Cleanup Level Exceedances Appendices Appendix A Appendix B Appendix C Soil Analytical Results Table Laboratory Analytical Results EPA Regional Screening Levels EPA Toxicity Characteristic Maximum Concentration of Contaminants

4 1. Introduction and Purpose Pinyon Environmental, Inc. (Pinyon), has completed shallow interval soil metal sampling to identify potential environmental concerns to support the 39 th Avenue Channel area (Project Area) of the City and County of Denver (CCOD) Platte to Park Hill (P2P) Drainage Project. The P2P Drainage Project design consists of new stormwater conveyance structures (buried pipes, culverts, or open channels) and new detention facilities for three discrete areas: The 39 th Avenue Greenway and Open Channel, Park Hill outfall, and City Park outfall. The purpose of the drainage improvements is to alleviate flooding issues that currently plague the area. This investigation targeted the 39 th Avenue Channel area, which is part of the 39 th Avenue Greenway and Open Channel. The 39 th Avenue Channel is located within sections of East 39 th Avenue, East 40 th Avenue, and Clayton Street Right of Ways (Figure 1). The Project Area is located within the boundaries of Operable Unit 1 (OU1) of the Vasquez Boulevard/Interstate 70 (VB/I-70) Superfund Site; OU1 is limited to residential areas where surface impacts were predominantly related to private application of arsenic containing crabgrass herbicides. A historical railroad alignment also extends along East 39 th Avenue and curves north north just east of Madison Street. Study Goals The construction of the P2P project is an important project for the CCOD and involves numerous key stakeholders and community leaders. Advancement of the Platte to Park Hill: Stormwater Systems master plan is the fundamental goal of the services presented in this investigation, with an emphasis placed on providing information that can be easily and seamlessly incorporated into the project planning efforts, particularly as they relate to material handling and disposal decisions at the Project Area. The following is a summary of the goals of this investigation: Provide information to better inform proposers and bidding contractors of potential environmental risks involved with the construction of the project to facilitate concise bids, assignment of responsibility, and to allow contractors and project personnel to make informed decisions that are protective of human health and the environment. Provide analytical data to evaluate whether impacts to soil occurred as a result of historical or current land uses and activities that occurred within or adjacent to the Project Area. These data will be compared to state and federal promulgated standards as part of this evaluation (see Section 3.2 and Appendix A). Previous Studies and Known Conditions Prior to the completion of this shallow interval soil metal sampling investigation, Pinyon completed an evaluation of historical and current uses to identify potential recognized environmental conditions (RECs) for the 39 th Avenue Greenway and Open Channel project area. Several RECs were identified for the 39 th Avenue Greenway and Open Channel, the details can be found in Evaluation of Historical Uses and Potential Recognized Environmental Conditions- Platte to Park Hill Drainage Project- Montclair Outfall (REC Report), completed by Pinyon, dated September 16, 2016 (Pinyon, 2016a). Because of the RECs identified in the REC report, a subsurface investigation was completed to evaluate potential impacts resulting from the identified RECs, and to provide information on the potential for the RECs to impact project and contractor liability during the construction phase of the project (Pinyon, 2016b). Complete details regarding the subsurface investigation can be found in the Final Soil Investigation Report completed by Pinyon, dated November 17, 2016 (Pinyon, 2016b). The subsurface investigation identified several locations with arsenic concentrations above the Colorado Department of Public Health and Environment (CDPHE) guidance value of 11 milligrams per kilogram (mg/kg). Based on the findings of the Shallow Interval Soil Metal Sampling Page 1 39th Avenue Channel Project Area Denver, Colorado

5 subsurface investigation, CCOD requested the collection of additional shallow interval soil samples to further investigate potential impacts from historical uses at the Project Area. Shallow Interval Soil Metal Sampling Page 2 39th Avenue Channel Project Area Denver, Colorado

6 2. Methods The scope of services to evaluate the potential environmental impacts of shallow interval soil included the following: Pinyon completed 38 shallow soil borings (to 24-inches below ground surface [bgs]); the boring locations were selected so that the sampling density was greatest in residential areas (Figure 2). Borings were completed using a hand-auger. The hand-auger was decontaminated between each boring. Decontamination procedures consisted of scrubbing equipment with a brush and soapy (Liquinox ) water, followed by rinsing equipment with clean tap water, and a final distilled water rinse. Two samples were collected from each boring; a composite of the 0 to 6-inch interval and a composite of the 6 to 24-inch interval. Each sample was placed in a zip-lock bag and mixed thoroughly. The sample was then transferred to a laboratory-supplied container, labeled, placed on ice in a cooler, and submitted to (Origins), under chain-of-custody for analysis of arsenic and lead by Environmental Protection Agency (EPA) method SW6010C. Borings were backfilled with the soil cuttings, and the surfaces returned to existing conditions. The locations of each boring were recorded using a hand-held global position system (GPS). Shallow Interval Soil Metal Sampling Page 3 39th Avenue Channel Project Area Denver, Colorado

7 3. Results Soil Guidance, Cleanup, and Screening Values Arsenic Risk Management Guidance Values In Colorado, arsenic occurs naturally, and often at concentrations greater than the EPA Regional Screening Levels (RSLs). Due to this, the CDPHE released guidance related to evaluating arsenic concentrations in soil (CDPHE, 2014). The guidance is based on the collection of over 2,700 samples from 44 counties in Colorado. The average concentration of arsenic in soils based on this sampling was 11 mg/kg. Arsenic values were compared to these CDPHE guidance values VB/I-70 Arsenic and Lead Cleanup Values The Project Area is located within OU1 of the VB/I-70 Superfund Site which is defined as residential yards with concentrations of lead or arsenic in soil that present an unacceptable risk to human health. OU1 constituted the highest priority for the EPA, as it had the highest potential for human exposure to contaminants of concern located in residential yards. On July 16, 1997, the CDPHE collected 25 soil samples from the residential yards in the Elyria and Swansea neighborhoods of Denver, situated to the north of the elevated portion of Interstate 70. The purpose of this sampling was to determine whether a threat to human health existed in the area due to historical smelting operations. Analysis of the 25 soil samples indicated that elevated levels of arsenic, cadmium, and lead were present. The discovery of these contaminants prompted further investigation to delineate the extent of arsenic, cadmium and lead present in soils of north Denver. An extensive soil sampling program was conducted in April 1998 and included the collection of 3,550 samples from parks, schools, and residences in the area. Samples were screened for impacts in the field and approximately 10 percent were sent for confirmatory laboratory analyses. Very low levels of arsenic and lead were detected in the samples from the schools and parks sampled; removal and replacement of the soil at these properties were not required. Based on the results of the sampling programs, the EPA determined that residential properties within the VB/I-70 site had been impacted by concentrations of arsenic or lead at levels that could present unacceptable health risks to residents with long-term exposures. On this basis, the EPA proposed the VB/I-70 site for inclusion on the National Priorities List (NPL) in January 1999 and with cleanup levels of 70 mg/kg for arsenic and 400 mg/kg for lead Lead Regional Screening Levels Lead concentrations were compared to the VB/I-70 cleanup value of 400 mg/kg, which is identical to the EPA Regional Screening Levels for Residential Soil (RRSL). The lead values were also compared to the EPA Regional Screening Level for Industrial Soil (IRSL), which is 800 mg/kg (Appendix C) Lead and Arsenic 20 Times Rule Waste Management (the operator of the Denver-Arapahoe Disposal Site [DADS]) will accept solid material where concentrations as determined by the toxicity characteristic leaching procedure (TCLP) method are less than 20 times the EPA Toxicity Maximum Concentrations of Contaminants (included as Appendix C); this is referred to as the 20 Times Rule. As an example, the regulatory level for lead provided by the EPA Toxicity Maximum Concentrations of Contaminants is 5.0 milligrams per liter (mg/l) when analyzed by TCLP. The Waste Management acceptable limit, when analyzed by totals analysis, would then be less than 100 mg/kg, using the 20 Times Rule. If concentrations of any contaminant exceeds the 20 Times Rule by totals analysis, then Shallow Interval Soil Metal Sampling Page 4 39th Avenue Channel Project Area Denver, Colorado

8 analysis for TCLP is required. If the TCLP results exceed the toxicity characteristic maximum concentration, then the material would require disposal at a hazardous waste disposal site in accordance with CDPHE requirements. Soil Results Pinyon completed 38 soil borings with one sample collected from the zero to six-inch bgs interval and one sample from the 6 to 24-inch bgs interval from each boring, for a total of 76 soil samples. Each of these samples were analyzed for arsenic and lead, and the detected concentrations were compared to the values discussed in Section 3.1. The CDPHE guidance value, VB/I-70 cleanup value, EPA RSL, and 20 Times Rule exceedances can be found in Table 3.1. A complete laboratory analytical results table can be found in Appendix A. Of the 76 total samples collected and analyzed, thirteen exceeded the CDPHE guidance value of 11 mg/kg for arsenic, with one of the samples also exceeding the VB/I-70 cleanup value of 70 mg/kg. Two samples exceeded the VB/I-70 cleanup value of 400 mg/kg for lead with no exceedances of the IRSL of 800 mg/kg. Fourteen of the samples exceeded the 20 Times Rule for lead, and one sample exceeded the 20 Times Rule for arsenic. TCLP analysis for lead and arsenic were below the EPA toxicity characteristic values for hazardous waste. Each of the guidance, screening, and/or cleanup value exceedances, except for sample MS09 (0-6), were detected along the historical railroad alignment that extend along East 39 th Avenue and curves north just east of Madison Street. Sample MS09(0-6) was collected from the northeast corner of the East 39 th Avenue and High Street intersection. Table 3-1 VB/I-70 Cleanup Value, EPA Regional Screening Value, or 20 Times Rule Exceedances Sample ID Sample Date Matrix TCLP TCLP Chem Name Arsenic Lead Arsenic Lead Units mg/kg mg/kg mg/l mg/l Colorado Specific CDPHE Arsenic * 11 NV NV NV I70/VB Arsenic Value ** 70 NV NV NV 40 CFR Part 261 rule of EPA IRSLs NV 800 NV NV EPA RRSLs NV 400 NV NV MS02(0-6) 5/15/2017 Soil NA MS02(6-24) 5/15/2017 Soil NA <0.033 MS03(0-6) 5/15/2017 Soil NA MS07(0-6) 5/17/2017 Soil NA J MS08(0-6) 5/15/2017 Soil NA MS09(0-6) 5/15/2017 Soil NA MS10(0-6) 5/15/2017 Soil NA NA MS11(0-6) 5/15/2017 Soil NA MS11(6-24) 5/15/2017 Soil NA NA MS12(0-6) 5/15/2017 Soil NA NA MS12(6-24) 5/15/2017 Soil NA NA MS13(0-6) 5/15/17 Soil NA MS14(0-6) 5/15/2017 Soil NA J MS14(6-24) 5/15/2017 Soil NA NA Shallow Interval Soil Metal Sampling Page 5 39th Avenue Channel Project Area Denver, Colorado

9 Sample ID Sample Date Matrix TCLP TCLP Chem Name Arsenic Lead Arsenic Lead Units mg/kg mg/kg mg/l mg/l Colorado Specific CDPHE Arsenic * 11 NV NV NV I70/VB Arsenic Value ** 70 NV NV NV 40 CFR Part 261 rule of EPA IRSLs NV 800 NV NV EPA RRSLs NV 400 NV NV MS15(0-6) 5/15/2017 Soil NA MS20(6-24) 5/15/2017 Soil NA NA MS22(0-6) 5/17/2017 Soil NA NA MS22(6-24) 5/17/2017 Soil <0.033 MS23(6-24) 5/17/2017 Soil NA NA MS24(6-24) 5/17/2017 Soil NA NA MS25(6-24) 5/17/2017 Soil NA NA MS27(0-6) 5/15/2017 Soil NA J MS29(0-6) 5/17/2017 Soil NA J MS30(0-6) 5/17/2017 Soil NA Notes: NA Not Applicable NV No regulatory value mg/kg milligrams per kilogram mg/l milligrams per liter J Greater than the detection limit but less than the reporting limit * - Colorado has a state specific CDPHE screening value for arsenic, 11 mg/kg, ** - Sampling was completed within OU1 of the I70/VB site and subject to the 70 mg/kg cleanup value. EPA IRSL U.S. Environmental Protection Agency Regional Screening Level for Industrial Soil (Target Cancer Risk of 1E-06, Hazard Quotient=0.1), June EPA RRSL U.S. Environmental Protection Agency Regional Screening Level for Residential Soil (Target Cancer Risk of 1E-06, Hazard Quotient=0.1), June CFR Part 261 Rule of times the EPA Toxicity Characteristic Maximum Concentration of Contaminants Orange highlights for concentrations exceeding CDPHE arsenic screening level Red highlights for concentrations exceeding the I70/VB cleanup value Green highlights for concentrations exceeding the EPA RRSL Bold Values exceed the EPA Toxicity Characteristic Maximum Concentration of Contaminants, 20 Times Rule. Values exceeding this were further analyzed by the Toxicity Characteristic Leaching Procedure. Shallow Interval Soil Metal Sampling Page 6 39th Avenue Channel Project Area Denver, Colorado

10 4. Conclusions Pinyon has completed this shallow interval soil metal sampling investigation to support the 39 th Avenue Channel Project Area, which is part of the larger P2P Drainage Project. The purpose of this shallow interval soil metal sampling was to collect additional soil samples to investigate potential shallow soil impacts from historical activities along the Project Area. This information will then be used to make necessary material handling and disposal decisions. This investigation only addresses soils from the surface to 24-inches bgs, with only arsenic and lead analysis being completed. Details regarding deeper interval soil samples and other compounds of concern can be found in the Final Soil Investigation Report (Pinyon, 2016b). The screening and cleanup value exceedances were predominantly concentrated along the historical railroad alignment where there is no landscaping or paved surfaces. One exceedance was also detected outside of the historical railroad alignment at the northeast corner of the East 39 th Avenue and High Street intersection. Shallow Interval Soil Metal Sampling Page 7 39th Avenue Channel Project Area Denver, Colorado

11 5. Recommendations Based on the finding of this surface metal soil sampling investigation, Pinyon recommends the following: It is recommended that a project-specific Materials Management Plan (MMP) be developed for the entire P2P Drainage Project corridor, including the 39 th Avenue Greenway and Open Channel, which the 39 th Avenue Channel Project Area is a part of. The MMP can be used to assist field operations, particularly construction, in preparing for identification and management of impacted soil and allow for informed decisions with regards to reuse options of excavated soil that results from construction. The MMP should incorporate procedures that adhere to the guidance document for the reuse of excess soils from City projects at third party properties provided by the CCOD (CCOD, 2015), and the contract documents. The MMP should include guidance to be used to reduce dust emissions from the project area. Methods that may be considered include adequate wetting of soils using water. The implementation of an MMP will also allow work activities to be completed in a manner that protects human health and the environment. Further, an MMP could help minimize potential delays, and clarify standard procedures to be implemented as needed in the event that regulated materials are encountered during construction. ed samples along the former railroad grades exhibited concentrations of arsenic and lead above the CDPHE guidance value and EPA screening and cleanup levels. Much of the Project Area, where exceedances were identified, is proposed to be constructed as an open channel; therefore, soil is likely to be displaced by the construction of the project. Shallow interval soils that do not exceed the VB/I-70 cleanup value and EPA RRSL may be reused along the P2P Drainage Project corridor or at an off-site location, although evaluations per the MMP may require additional evaluation. Shallow Interval Soil Metal Sampling Page 8 39th Avenue Channel Project Area Denver, Colorado

12 6. ations This report was prepared by Pinyon Environmental, Inc., at the request of and for the sole benefit of the City and County of Denver, or any entity controlling, controlled by, or under common control with the City and County of Denver. The conclusions and recommendations offered in this report are based on the data obtained from a limited number of samples. Soil conditions typically vary even over short distances. Thus, the nature and extent of variations outside the subsurface investigation may not become evident except through further investigation. This report is the exclusive and present use of the City and County of Denver, or any entity controlling, controlled by, or under common control with the City and County of Denver. Laboratory analysis has been performed for specific constituents during the course of this investigation, as described in the text. This study makes no attempt to assess constituents not searched for in the laboratory analysis. Conclusions stated herein refer only to the specific site at the time of the investigation. Shallow Interval Soil Metal Sampling Page 9 39th Avenue Channel Project Area Denver, Colorado

13 7. References CCOD, Guidance for Third Party Reuse of Excess Soil from City Projects, City and County of Denver, Department of Environmental Health, April 29, CDPHE, Risk Management Guidance for Evaluating Arsenic Concentrations in Soil. Colorado Department of Public Health and Environment, Hazardous Materials and Waste Management Division, Revised July Pinyon, 2016a. Evaluation of Historical Uses and Potential Recognized Environmental Conditions- Platte to Park Hill Drainage Project- Montclair Outfall. Pinyon Environmental, Inc., September 16, Pinyon, 2016b. Final Soil Investigation Report, Pinyon Environmental, Inc., Project #1/ , November, 17, Shallow Interval Soil Metal Sampling Page 10 39th Avenue Channel Project Area Denver, Colorado

14 Figures Shallow Interval Soil Metal Sampling 39th Avenue Channel Project Area Denver, Colorado

15 ³ Sources: Esri, HERE, DeLorme, Intermap, increment P Corp., GEBCO, USGS, FAO, NPS, NRCAN, GeoBase, IGN, Kadaster NL, Ordnance Survey, Esri Japan, METI, Esri China (Hong Kong), swisstopo, MapmyIndia, OpenStreetMap contributors, and the GIS User Community Legend Site Boundary Site Location: Sections 23 and 24, Township 3S, Range 68W, 6th Principal Meridian Pinyon Project Number: 1/ Document Path: Z:\PROJECTS\2016\ Two Basin Drainage\Surface Metal Sampling\Figures\ArcMap\MXDs\REM01_Site Location.mxd ,500 Feet SITE LOCATION Platte to Park Hill 39th Avenue Channel Project Area City and County of Denver, Colorado Drawn By: JAF Reviewed By: TRG Figure 1 Date: 7/18/2017

16 ³ Legend (! (! Soil Boring - No Exceedances Soil Boring - Exceedance Site Boundary Site Location: Sections 23 and 24, Township 3S, Range 68W, 6th Principal Meridian Pinyon Project Number: 1/ Document Path: Z:\PROJECTS\2016\ Two Basin Drainage\Surface Metal Sampling\Figures\ArcMap\MXDs\REM02_Boring Locations and Exceedances.mxd Notes: All units are in milligrams per kilogram (mg/kg) Red text - Exceeds CDPHE Arsenic Guidance Value of 11 mg/kg Red Bold text - Exceeds VB/I-70 Arsenic Cleanup Value of 70 mg/kg Blue text - Exceeds EPA Regional Screening Level for Residential Soil and VB/I-70 Lead Cleanup Value of 400 mg/kg Feet BORING LOCATIONS AND SCREENING/ CLEANUP LEVEL EXCEEDANCES Platte to Park Hill 39th Avenue Channel Project Area City and County of Denver, Colorado Drawn By: JAF Reviewed By: TRG Figure 2 Date: 7/18/2017

17 Appendices Shallow Interval Soil Metal Sampling 39th Avenue Channel Project Area Denver, Colorado

18 Appendix A Soil Analytical Results Table Sample ID Sample Date Matrix TCLP TCLP Chem Name Arsenic Lead Arsenic Lead Units mg/kg mg/kg mg/l mg/l Colorado Specific CDPHE Arsenic * 11 NA VB/I-70 Arsenic Value ** 70 NA 40 CFR Part 261 rule of EPA IRSLs NA 800 EPA RRSLs NA 400 MS01(0-6) 5/15/2017 Soil NA NA MS01(6-24) 5/15/2017 Soil NA NA MS02(0-6) 5/15/2017 Soil NA 0.082J MS02(6-24) 5/15/2017 Soil NA <0.033 MS03(0-6) 5/15/2017 Soil NA MS03(6-24) 5/15/2017 Soil NA NA MS04(0-6) 5/15/2017 Soil NA NA MS04(6-24) 5/15/2017 Soil NA NA MS05(0-6) 5/15/2017 Soil NA NA MS05(6-24) 5/15/2017 Soil NA NA MS06(0-6) 5/15/2017 Soil NA NA MS06(6-24) 5/15/2017 Soil NA NA MS07(0-6) 5/17/2017 Soil NA J MS07(6-24) 5/17/2017 Soil NA NA MS08(0-6) 5/15/2017 Soil NA J MS08(6-24) 5/15/2017 Soil NA NA MS09(0-6) 5/15/2017 Soil NA MS09(6-24) 5/15/2017 Soil NA NA MS10(0-6) 5/15/2017 Soil NA NA MS10(6-24) 5/15/2017 Soil NA NA MS11(0-6) 5/15/2017 Soil NA MS11(6-24) 5/15/2017 Soil NA NA MS12(0-6) 5/15/2017 Soil NA NA MS12(6-24) 5/15/2017 Soil NA NA MS13(0-6) 5/15/2017 Soil NA J MS13(6-24) 5/15/2017 Soil NA NA MS14(0-6) 5/15/2017 Soil NA J MS14(6-24) 5/15/2017 Soil NA NA MS15(0-6) 5/15/2017 Soil NA MS15(6-24) 5/15/2017 Soil NA NA MS16(0-6) 5/15/2017 Soil NA NA MS16(6-24) 5/15/2017 Soil NA NA Shallow Interval Soil Metal Sampling 39th Avenue Channel Project Area Denver, Colorado

19 Sample ID Sample Date Matrix TCLP TCLP Chem Name Arsenic Lead Arsenic Lead Units mg/kg mg/kg mg/l mg/l Colorado Specific CDPHE Arsenic * 11 NA VB/I-70 Arsenic Value ** 70 NA 40 CFR Part 261 rule of EPA IRSLs NA 800 EPA RRSLs NA 400 MS17(0-6) 5/15/2017 Soil NA NA MS17(6-24) 5/15/2017 Soil NA NA MS18(0-6) 5/15/2017 Soil NA NA MS18(6-24) 5/15/2017 Soil NA NA MS19(0-6) 5/15/2017 Soil NA NA MS19(6-24) 5/15/2017 Soil NA NA MS20(0-6) 5/15/2017 Soil NA NA MS20(6-24) 5/15/2017 Soil NA NA MS21(0-6) 5/15/2017 Soil NA NA MS21(6-24) 5/15/2017 Soil NA NA MS22(0-6) 5/17/2017 Soil NA NA MS22(6-24) 5/17/2017 Soil <0.033 MS23(0-6) 5/17/2017 Soil NA NA MS23(6-24) 5/17/2017 Soil NA NA MS24(0-6) 5/17/2017 Soil NA NA MS24(6-24) 5/17/2017 Soil NA NA MS25(0-6) 5/17/2017 Soil NA NA MS25(6-24) 5/17/2017 Soil NA NA MS26(0-6) 5/17/2017 Soil NA NA MS26(6-24) 5/17/2017 Soil NA NA MS27(0-6) 5/15/2017 Soil NA 0.546J MS27(6-24) 5/15/2017 Soil NA NA MS28(0-6) 5/17/2017 Soil NA NA MS28(6-24) 5/17/2017 Soil NA NA MS29(0-6) 5/17/2017 Soil NA J MS29(6-24) 5/17/2017 Soil NA NA MS30(0-6) 5/17/2017 Soil NA MS30(6-24) 5/17/2017 Soil NA NA MS31(0-6) 5/17/2017 Soil NA NA MS31(6-24) 5/17/2017 Soil NA NA MS32(0-6) 5/17/2017 Soil NA NA MS32(6-24) 5/17/2017 Soil NA NA MS33(0-6) 5/17/2017 Soil NA NA MS33(6-24) 5/17/2017 Soil NA NA Shallow Interval Soil Metal Sampling 39th Avenue Channel Project Area Denver, Colorado

20 Sample ID Sample Date Matrix TCLP TCLP Chem Name Arsenic Lead Arsenic Lead Units mg/kg mg/kg mg/l mg/l Colorado Specific CDPHE Arsenic * 11 NA VB/I-70 Arsenic Value ** 70 NA 40 CFR Part 261 rule of EPA IRSLs NA 800 EPA RRSLs NA 400 MS34(0-6) 5/17/2017 Soil NA NA MS34(6-24) 5/17/2017 Soil NA NA MS35(0-6) 5/17/2017 Soil NA NA MS35(6-24) 5/17/2017 Soil NA NA MS36(0-6) 5/17/2017 Soil NA NA MS36(6-24) 5/17/2017 Soil NA NA MS37(0-6) 5/17/2017 Soil NA NA MS37(6-24) 5/17/2017 Soil NA NA MS38(0-6) 5/17/2017 Soil NA NA MS38(6-24) 5/17/2017 Soil NA NA Notes: NA Not Applicable mg/kg milligrams per kilogram NV No regulatory value J Greater than the detection limit but less than the reporting limit * - Colorado has a state specific CDPHE screening value for arsenic, 11 mg/kg, ** - Sampling was completed within OU1 of the VB/I-70 site and subject to the 70 mg/kg cleanup value. EPA IRSL U.S. Environmental Protection Agency Regional Screening Level for Industrial Soil (Target Cancer Risk of 1E-06, Hazard Quotient=0.1), June EPA RRSL U.S. Environmental Protection Agency Regional Screening Level for Residential Soil (Target Cancer Risk of 1E-06, Hazard Quotient=0.1), June CFR Part 261 Rule of times the EPA Toxicity Characteristic Maximum Concentration of Contaminants Orange highlights for concentrations exceeding CDPHE arsenic screening level Red highlights for concentrations exceeding the VB/I-70 cleanup value Blue highlights for concentrations exceeding the EPA IRSL Green highlights for concentrations exceeding the EPA RRSL Bold Values exceed the EPA Toxicity Characteristic Maximum Concentration of Contaminants, 20 Times Rule. Values exceeding this were further analyzed by the Toxicity Characteristic Leaching Procedure. Shallow Interval Soil Metal Sampling 39th Avenue Channel Project Area Denver, Colorado

21 Appendix B Laboratory Analytical Results Shallow Interval Soil Metal Sampling 39th Avenue Channel Project Area Denver, Colorado

22 July 31, 2017 Project Name - Platte to Park Hill Project Number Attached are your analytical results for Platte to Park Hill received by May 17, This project is associated with Origins project number Y The analytical results in the following report were analyzed under the guidelines of EPA Methods. These methods are identified as follows; "SW" are defined in SW-846, "EPA" are defined in 40CFR part 136 and "SM" are defined in the most current revision of Standard Methods For the Examination of Water and Wastewater. The analytical results apply specifically to the samples and analyses specified per the attached Chain of Custody. As such, this report shall not be reproduced except in full, without the written approval of Origin's laboratory. Unless otherwise noted, the analytical results for all soil samples are reported on a wet weight basis. All analytical analyses were performed under NELAP guidelines unless noted by a data qualifier. Any holding time exceedances, deviations from the method specifications or deviations from Origins Laboratory's Standard Operating Procedures are outlined in the case narrative. Thank you for selecting Origins for your analytical needs. Please contact us with any questions concerning this report, or if we can help with anything at all o-squad@oelabinc.com

23 Project Number: Sample ID Laboratory ID Matrix CROSS REFERENCE REPORT Date Sampled Date Received MS22 (0-6) Y Soil May 17, :25 05/17/ :30 MS22 (6-24) Y Soil May 17, :30 05/17/ :30 MS23 (0-6) Y Soil May 17, :20 05/17/ :30 MS23 (6-24) Y Soil May 17, :22 05/17/ :30 MS24 (0-6) Y Soil May 17, :08 05/17/ :30 MS24 (6-24) Y Soil May 17, :10 05/17/ :30 MS25 (0-6) Y Soil May 17, :00 05/17/ :30 MS25 (6-24) Y Soil May 17, :03 05/17/ :30 MS26 (0-6) Y Soil May 17, :50 05/17/ :30 MS26 (6-24) Y Soil May 17, :52 05/17/ :30 MS28 (0-6) Y Soil May 17, :42 05/17/ :30 MS28 (6-24) Y Soil May 17, :45 05/17/ :30 MS29 (0-6) Y Soil May 17, :10 05/17/ :30 MS29 (6-24) Y Soil May 17, :12 05/17/ :30 Page 2 of 47

24 Project Number: Sample ID Laboratory ID Matrix CROSS REFERENCE REPORT Date Sampled Date Received MS30 (0-6) Y Soil May 17, :02 05/17/ :30 MS30 (6-24) Y Soil May 17, :03 05/17/ :30 MS31 (0-6) Y Soil May 17, :50 05/17/ :30 MS31 (6-24) Y Soil May 17, :52 05/17/ :30 MS32 (0-6) Y Soil May 17, :55 05/17/ :30 MS32 (6-24) Y Soil May 17, :57 05/17/ :30 MS33 (0-6) Y Soil May 17, :05 05/17/ :30 MS33 (6-24) Y Soil May 17, :07 05/17/ :30 MS34 (0-6) Y Soil May 17, :10 05/17/ :30 MS34 (6-24) Y Soil May 17, :12 05/17/ :30 MS35 (0-6) Y Soil May 17, :20 05/17/ :30 MS35 (6-24) Y Soil May 17, :22 05/17/ :30 MS36 (0-6) Y Soil May 17, :30 05/17/ :30 MS36 (6-24) Y Soil May 17, :32 05/17/ :30 Page 3 of 47

25 Project Number: Sample ID Laboratory ID Matrix CROSS REFERENCE REPORT Date Sampled Date Received MS37 (0-6) Y Soil May 17, :35 05/17/ :30 MS37 (6-24) Y Soil May 17, :37 05/17/ :30 MS38 (0-6) Y Soil May 17, :45 05/17/ :30 MS38 (6-24) Y Soil May 17, :48 05/17/ :30 MS07 (0-6) Y Soil May 17, :35 05/17/ :30 MS07 (6-24) Y Soil May 17, :40 05/17/ :30 Page 4 of 47

26 Project Number: COC Goes Here Page 5 of 47

27 Project Number: COC Goes Here Page 6 of 47

28 Project Number: COC Goes Here Page 7 of 47

29 Project Number: COC Goes Here Page 8 of 47

30 Project Number: COC Goes Here Page 9 of 47

31 Project Number: MS22 (0-6) 5/17/2017 1:25:00PM Units Dilution Batch Y (Soil) Arsenic Lead /19/ /22/2017 Page 10 of 47

32 Project Number: MS22 (6-24) 5/17/2017 1:30:00PM Units Dilution Batch Y (Soil) TCLP Metals by 1311/6010C Arsenic Lead ND mg/l /26/ /26/2017 U Arsenic Lead /19/ /22/2017 Page 11 of 47

33 Project Number: MS23 (0-6) 5/17/2017 1:20:00PM Units Dilution Batch Y (Soil) Arsenic Lead /19/ /22/2017 Page 12 of 47

34 Project Number: MS23 (6-24) 5/17/2017 1:22:00PM Units Dilution Batch Y (Soil) Arsenic Lead /19/ /22/2017 Page 13 of 47

35 Project Number: MS24 (0-6) 5/17/2017 1:08:00PM Units Dilution Batch Y (Soil) Arsenic Lead /19/ /22/2017 Page 14 of 47

36 Project Number: MS24 (6-24) 5/17/2017 1:10:00PM Units Dilution Batch Y (Soil) Arsenic Lead /19/ /22/2017 Page 15 of 47

37 Project Number: MS25 (0-6) 5/17/2017 1:00:00PM Units Dilution Batch Y (Soil) Arsenic Lead /19/ /22/2017 Page 16 of 47

38 Project Number: MS25 (6-24) 5/17/2017 1:03:00PM Units Dilution Batch Y (Soil) Arsenic Lead /19/ /22/2017 Page 17 of 47

39 Project Number: MS26 (0-6) 5/17/ :50:00PM Units Dilution Batch Y (Soil) Arsenic Lead /19/ /22/2017 Page 18 of 47

40 Project Number: MS26 (6-24) 5/17/ :52:00PM Units Dilution Batch Y (Soil) Arsenic Lead /19/ /22/2017 Page 19 of 47

41 Project Number: MS28 (0-6) 5/17/2017 1:42:00PM Units Dilution Batch Y (Soil) Arsenic Lead /19/ /22/2017 J Page 20 of 47

42 Project Number: MS28 (6-24) 5/17/2017 1:45:00PM Units Dilution Batch Y (Soil) Arsenic Lead /19/ /22/2017 J Page 21 of 47

43 Project Number: MS29 (0-6) 5/17/2017 3:10:00PM Units Dilution Batch Y (Soil) TCLP Metals by 1311/6010C Lead mg/l /26/ /26/2017 J Arsenic Lead /19/ /22/2017 Page 22 of 47

44 Project Number: MS29 (6-24) 5/17/2017 3:12:00PM Units Dilution Batch Y (Soil) Arsenic Lead /19/ /22/2017 Page 23 of 47

45 Project Number: MS30 (0-6) 5/17/2017 3:02:00PM Units Dilution Batch Y (Soil) TCLP Metals by 1311/6010C Lead mg/l /26/ /26/2017 Arsenic Lead /19/ /22/2017 Page 24 of 47

46 Project Number: MS30 (6-24) 5/17/2017 3:03:00PM Units Dilution Batch Y (Soil) Arsenic Lead /19/ /22/2017 Page 25 of 47

47 Project Number: MS31 (0-6) 5/17/2017 2:50:00PM Units Dilution Batch Y (Soil) Arsenic Lead /19/ /22/2017 Page 26 of 47

48 Project Number: MS31 (6-24) 5/17/2017 2:52:00PM Units Dilution Batch Y (Soil) Arsenic Lead /19/ /22/2017 Page 27 of 47

49 Project Number: MS32 (0-6) 5/17/2017 1:55:00PM Units Dilution Batch Y (Soil) Arsenic Lead /19/ /22/2017 Page 28 of 47

50 Project Number: MS32 (6-24) 5/17/2017 1:57:00PM Units Dilution Batch Y (Soil) Arsenic Lead /19/ /22/2017 Page 29 of 47

51 Project Number: MS33 (0-6) 5/17/2017 2:05:00PM Units Dilution Batch Y (Soil) Arsenic Lead /19/ /22/2017 Page 30 of 47

52 Project Number: MS33 (6-24) 5/17/2017 2:07:00PM Units Dilution Batch Y (Soil) Arsenic Lead /19/ /22/2017 Page 31 of 47

53 Project Number: MS34 (0-6) 5/17/2017 2:10:00PM Units Dilution Batch Y (Soil) Arsenic Lead /19/ /22/2017 Page 32 of 47

54 Project Number: MS34 (6-24) 5/17/2017 2:12:00PM Units Dilution Batch Y (Soil) Arsenic Lead /19/ /22/2017 Page 33 of 47

55 Project Number: MS35 (0-6) 5/17/2017 2:20:00PM Units Dilution Batch Y (Soil) Arsenic Lead /19/ /22/2017 Page 34 of 47

56 Project Number: MS35 (6-24) 5/17/2017 2:22:00PM Units Dilution Batch Y (Soil) Arsenic Lead /19/ /22/2017 Page 35 of 47

57 Project Number: MS36 (0-6) 5/17/2017 2:30:00PM Units Dilution Batch Y (Soil) Arsenic Lead /19/ /22/2017 Page 36 of 47

58 Project Number: MS36 (6-24) 5/17/2017 2:32:00PM Units Dilution Batch Y (Soil) Arsenic Lead /19/ /22/2017 Page 37 of 47

59 Project Number: MS37 (0-6) 5/17/2017 2:35:00PM Units Dilution Batch Y (Soil) Arsenic Lead /19/ /22/2017 Page 38 of 47

60 Project Number: MS37 (6-24) 5/17/2017 2:37:00PM Units Dilution Batch Y (Soil) Arsenic Lead /19/ /22/2017 Page 39 of 47

61 Project Number: MS38 (0-6) 5/17/2017 2:45:00PM Units Dilution Batch Y (Soil) Arsenic Lead /19/ /22/2017 Page 40 of 47

62 Project Number: MS38 (6-24) 5/17/2017 2:48:00PM Units Dilution Batch Y (Soil) Arsenic Lead /19/ /22/2017 Page 41 of 47

63 Project Number: MS07 (0-6) 5/17/2017 3:35:00PM Units Dilution Batch Y (Soil) TCLP Metals by 1311/6010C Lead mg/l /26/ /26/2017 J Arsenic Lead /19/ /22/2017 Page 42 of 47

64 Project Number: MS07 (6-24) 5/17/2017 3:40:00PM Units Dilution Batch Y (Soil) Arsenic Lead /19/ /22/2017 Page 43 of 47

65 Project Number: TCLP Metals by 1311/6010C - Quality Control Analyte Result Units Spike Level Source Result %REC %REC s RPD RPD Notes Batch SW A MS ( S) Prepared: 07/26/2017 Analyzed: 07/26/2017 Source: Lead mg/l Arsenic " 5.00 < TB ( BLK) Prepared: 07/26/2017 Analyzed: 07/26/2017 Arsenic ND mg/l - U Lead ND " - U BLANK ( BLK) Prepared: 07/26/2017 Analyzed: 07/26/2017 Arsenic ND mg/l - U Lead ND " - U LCS ( BKS) Prepared: 07/26/2017 Analyzed: 07/27/2017 Arsenic mg/l Lead " DUP ( D) Prepared: 07/26/2017 Analyzed: 07/26/2017 Source: Arsenic ND mg/l < NR 20 U Lead " J Page 44 of 47

66 Project Number: Quality Control Analyte Result Units Spike Level Source Result %REC %REC s RPD RPD Notes Batch SW B BLANK ( BLK) Prepared: 05/19/2017 Analyzed: 05/22/2017 Lead ND mg/kg - U Arsenic ND 2.87 " - U LCS ( BKS) Prepared: 05/19/2017 Analyzed: 05/22/2017 Lead mg/kg Arsenic " DUP ( D) Prepared: 05/19/2017 Analyzed: 05/22/2017 Source: Y Arsenic mg/kg dry Lead " MS ( S) Prepared: 05/19/2017 Analyzed: 05/22/2017 Source: Y Arsenic mg/kg dry Lead " BLANK ( BLK) Prepared: 05/19/2017 Analyzed: 05/22/2017 Arsenic ND 2.77 mg/kg - U Lead ND " - U LCS ( BKS) Prepared: 05/19/2017 Analyzed: 05/22/2017 Arsenic mg/kg Lead " DUP ( D) Prepared: 05/19/2017 Analyzed: 05/22/2017 Source: Y Arsenic mg/kg dry Lead " MS ( S) Prepared: 05/19/2017 Analyzed: 05/22/2017 Source: Y Lead mg/kg dry Page 45 of 47

67 Project Number: Quality Control Analyte Result Units Spike Level Source Result %REC %REC s RPD RPD Notes Batch SW B MS ( S) Prepared: 05/19/2017 Analyzed: 05/22/2017 Source: Y Arsenic mg/kg dry Page 46 of 47

68 Project Number: Notes and Definitions U Result not detected above the detection limit J Greater than the detection limit but less than the reporting limit ND Analyte NOT DETECTED at or above the reporting limit RPD Relative Percent Difference All soil results are reported on a wet weight basis. Page 47 of 47

69 July 31, 2017 Project Name - Platte to Park Hill Project Number - [none] Attached are your analytical results for Platte to Park Hill received by May 15, This project is associated with Origins project number Y The analytical results in the following report were analyzed under the guidelines of EPA Methods. These methods are identified as follows; "SW" are defined in SW-846, "EPA" are defined in 40CFR part 136 and "SM" are defined in the most current revision of Standard Methods For the Examination of Water and Wastewater. The analytical results apply specifically to the samples and analyses specified per the attached Chain of Custody. As such, this report shall not be reproduced except in full, without the written approval of Origin's laboratory. Unless otherwise noted, the analytical results for all soil samples are reported on a wet weight basis. All analytical analyses were performed under NELAP guidelines unless noted by a data qualifier. Any holding time exceedances, deviations from the method specifications or deviations from Origins Laboratory's Standard Operating Procedures are outlined in the case narrative. Thank you for selecting Origins for your analytical needs. Please contact us with any questions concerning this report, or if we can help with anything at all o-squad@oelabinc.com

70 Project Number: [none] Sample ID Laboratory ID Matrix CROSS REFERENCE REPORT Date Sampled Date Received MS01 (0-6) Y Soil May 15, :55 05/15/ :20 MS01 (6-24) Y Soil May 15, :05 05/15/ :20 MS02 (0-6) Y Soil May 15, :05 05/15/ :20 MS02 (6-24) Y Soil May 15, :10 05/15/ :20 MS03 (0-6) Y Soil May 15, :20 05/15/ :20 MS03 (6-24) Y Soil May 15, :25 05/15/ :20 MS04 (0-6) Y Soil May 15, :30 05/15/ :20 MS04 (6-24) Y Soil May 15, :35 05/15/ :20 MS05 (0-6) Y Soil May 15, :42 05/15/ :20 MS05 (6-24) Y Soil May 15, :45 05/15/ :20 MS06 (0-6) Y Soil May 15, :50 05/15/ :20 MS06 (6-24) Y Soil May 15, :52 05/15/ :20 MS08 (0-6) Y Soil May 15, :57 05/15/ :20 MS08 (6-24) Y Soil May 15, :59 05/15/ :20 Page 2 of 57

71 Project Number: [none] Sample ID Laboratory ID Matrix CROSS REFERENCE REPORT Date Sampled Date Received MS09 (0-6) Y Soil May 15, :22 05/15/ :20 MS09 (6-24) Y Soil May 15, :25 05/15/ :20 MS10 (0-6) Y Soil May 15, :37 05/15/ :20 MS10 (6-24) Y Soil May 15, :40 05/15/ :20 MS11 (0-6) Y Soil May 15, :47 05/15/ :20 MS11 (6-24) Y Soil May 15, :49 05/15/ :20 MS12 (0-6) Y Soil May 15, :56 05/15/ :20 MS12 (6-24) Y Soil May 15, :59 05/15/ :20 MS13 (0-6) Y Soil May 15, :03 05/15/ :20 MS13 (6-24) Y Soil May 15, :05 05/15/ :20 MS14 (0-6) Y Soil May 15, :13 05/15/ :20 MS14 (6-24) Y Soil May 15, :15 05/15/ :20 MS15 (0-6) Y Soil May 15, :21 05/15/ :20 MS15 (6-24) Y Soil May 15, :23 05/15/ :20 Page 3 of 57

72 Project Number: [none] Sample ID Laboratory ID Matrix CROSS REFERENCE REPORT Date Sampled Date Received MS16 (0-6) Y Soil May 15, :41 05/15/ :20 MS16 (6-24) Y Soil May 15, :42 05/15/ :20 MS17 (0-6) Y Soil May 15, :51 05/15/ :20 MS17 (6-24) Y Soil May 15, :53 05/15/ :20 MS18 (0-6) Y Soil May 15, :00 05/15/ :20 MS18 (6-24) Y Soil May 15, :03 05/15/ :20 MS19 (0-6) Y Soil May 15, :16 05/15/ :20 MS19 (6-24) Y Soil May 15, :18 05/15/ :20 MS20 (0-6) Y Soil May 15, :30 05/15/ :20 MS20 (6-24) Y Soil May 15, :32 05/15/ :20 MS21 (0-6) Y Soil May 15, :35 05/15/ :20 MS21 (6-24) Y Soil May 15, :37 05/15/ :20 MS27 (0-6) Y Soil May 15, :05 05/15/ :20 MS27 (6-24) Y Soil May 15, :08 05/15/ :20 Page 4 of 57

73 Project Number: [none] Page 5 of 57

74 Project Number: [none] COC Goes Here Page 6 of 57

75 Project Number: [none] COC Goes Here Page 7 of 57

76 Project Number: [none] COC Goes Here Page 8 of 57

77 Project Number: [none] COC Goes Here Page 9 of 57

78 Project Number: [none] COC Goes Here Page 10 of 57

79 Project Number: [none] COC Goes Here Page 11 of 57

80 Project Number: [none] MS01 (0-6) 5/15/ :55:00AM Units Dilution Batch Y (Soil) Arsenic Lead /17/ /18/2017 Page 12 of 57

81 Project Number: [none] MS01 (6-24) 5/15/ :05:00PM Units Dilution Batch Y (Soil) Arsenic Lead /17/ /18/2017 Page 13 of 57

82 Project Number: [none] MS02 (0-6) 5/15/ :05:00PM Units Dilution Batch Y (Soil) TCLP Metals by 1311/6010C Lead mg/l /26/ /26/2017 J Arsenic Lead /17/ /18/2017 Page 14 of 57

83 Project Number: [none] MS02 (6-24) 5/15/ :10:00PM Units Dilution Batch Y (Soil) TCLP Metals by 1311/6010C Lead ND mg/l /26/ /26/2017 U Arsenic Lead /17/ /18/2017 Page 15 of 57

84 Project Number: [none] MS03 (0-6) 5/15/ :20:00PM Units Dilution Batch Y (Soil) TCLP Metals by 1311/6010C Lead mg/l /26/ /26/2017 Arsenic Lead /17/ /18/2017 Page 16 of 57

85 Project Number: [none] MS03 (6-24) 5/15/ :25:00PM Units Dilution Batch Y (Soil) Arsenic Lead /17/ /18/2017 Page 17 of 57

86 Project Number: [none] MS04 (0-6) 5/15/ :30:00PM Units Dilution Batch Y (Soil) Arsenic Lead /17/ /18/2017 Page 18 of 57

87 Project Number: [none] MS04 (6-24) 5/15/ :35:00PM Units Dilution Batch Y (Soil) Arsenic Lead /17/ /18/2017 J Page 19 of 57

88 Project Number: [none] MS05 (0-6) 5/15/ :42:00PM Units Dilution Batch Y (Soil) Arsenic Lead /17/ /18/2017 Page 20 of 57

89 Project Number: [none] MS05 (6-24) 5/15/ :45:00PM Units Dilution Batch Y (Soil) Arsenic Lead /17/ /18/2017 Page 21 of 57

90 Project Number: [none] MS06 (0-6) 5/15/ :50:00PM Units Dilution Batch Y (Soil) Arsenic Lead /17/ /18/2017 Page 22 of 57

91 Project Number: [none] MS06 (6-24) 5/15/ :52:00PM Units Dilution Batch Y (Soil) Arsenic Lead /17/ /18/2017 Page 23 of 57

92 Project Number: [none] MS08 (0-6) 5/15/ :57:00PM Units Dilution Batch Y (Soil) TCLP Metals by 1311/6010C Lead mg/l /26/ /26/2017 J Arsenic Lead /17/ /18/2017 Page 24 of 57

93 Project Number: [none] MS08 (6-24) 5/15/ :59:00PM Units Dilution Batch Y (Soil) Arsenic Lead /17/ /18/2017 Page 25 of 57

94 Project Number: [none] MS09 (0-6) 5/15/2017 1:22:00PM Units Dilution Batch Y (Soil) TCLP Metals by 1311/6010C Lead mg/l /26/ /26/2017 Arsenic Lead /17/ /18/2017 Page 26 of 57

95 Project Number: [none] MS09 (6-24) 5/15/2017 1:25:00PM Units Dilution Batch Y (Soil) Arsenic Lead /17/ /18/2017 Page 27 of 57

96 Project Number: [none] MS10 (0-6) 5/15/2017 1:37:00PM Units Dilution Batch Y (Soil) Arsenic Lead /17/ /18/2017 Page 28 of 57

97 Project Number: [none] MS10 (6-24) 5/15/2017 1:40:00PM Units Dilution Batch Y (Soil) Arsenic Lead /17/ /18/2017 Page 29 of 57

98 Project Number: [none] MS11 (0-6) 5/15/2017 1:47:00PM Units Dilution Batch Y (Soil) TCLP Metals by 1311/6010C Lead mg/l /26/ /26/2017 Arsenic Lead /17/ /18/2017 Page 30 of 57

99 Project Number: [none] MS11 (6-24) 5/15/2017 1:49:00PM Units Dilution Batch Y (Soil) Arsenic Lead /17/ /18/2017 Page 31 of 57

100 Project Number: [none] MS12 (0-6) 5/15/2017 1:56:00PM Units Dilution Batch Y (Soil) Arsenic Lead /17/ /18/2017 Page 32 of 57

101 Project Number: [none] MS12 (6-24) 5/15/2017 1:59:00PM Units Dilution Batch Y (Soil) Arsenic Lead /17/ /18/2017 Page 33 of 57

102 Project Number: [none] MS13 (0-6) 5/15/2017 2:03:00PM Units Dilution Batch Y (Soil) TCLP Metals by 1311/6010C Lead mg/l /26/ /26/2017 J Arsenic Lead /17/ /18/2017 Page 34 of 57

103 Project Number: [none] MS13 (6-24) 5/15/2017 2:05:00PM Units Dilution Batch Y (Soil) Arsenic Lead /17/ /18/2017 Page 35 of 57

104 Project Number: [none] MS14 (0-6) 5/15/2017 2:13:00PM Units Dilution Batch Y (Soil) TCLP Metals by 1311/6010C Lead mg/l /26/ /26/2017 J Arsenic Lead /17/ /18/2017 Page 36 of 57

105 Project Number: [none] MS14 (6-24) 5/15/2017 2:15:00PM Units Dilution Batch Y (Soil) Arsenic Lead /17/ /18/2017 Page 37 of 57

106 Project Number: [none] MS15 (0-6) 5/15/2017 2:21:00PM Units Dilution Batch Y (Soil) TCLP Metals by 1311/6010C Lead mg/l /26/ /26/2017 Arsenic Lead /17/ /18/2017 Page 38 of 57

107 Project Number: [none] MS15 (6-24) 5/15/2017 2:23:00PM Units Dilution Batch Y (Soil) Arsenic Lead /17/ /18/2017 Page 39 of 57

108 Project Number: [none] MS16 (0-6) 5/15/2017 2:41:00PM Units Dilution Batch Y (Soil) Arsenic Lead /17/ /18/2017 Page 40 of 57

109 Project Number: [none] MS16 (6-24) 5/15/2017 2:42:00PM Units Dilution Batch Y (Soil) Arsenic Lead /17/ /18/2017 Page 41 of 57

110 Project Number: [none] MS17 (0-6) 5/15/2017 2:51:00PM Units Dilution Batch Y (Soil) Arsenic Lead /17/ /18/2017 Page 42 of 57

111 Project Number: [none] MS17 (6-24) 5/15/2017 2:53:00PM Units Dilution Batch Y (Soil) Arsenic Lead /17/ /18/2017 Page 43 of 57

112 Project Number: [none] MS18 (0-6) 5/15/2017 3:00:00PM Units Dilution Batch Y (Soil) Arsenic Lead /17/ /18/2017 Page 44 of 57

113 Project Number: [none] MS18 (6-24) 5/15/2017 3:03:00PM Units Dilution Batch Y (Soil) Arsenic Lead /17/ /18/2017 Page 45 of 57

114 Project Number: [none] MS19 (0-6) 5/15/2017 3:16:00PM Units Dilution Batch Y (Soil) Arsenic Lead /17/ /18/2017 J Page 46 of 57

115 Project Number: [none] MS19 (6-24) 5/15/2017 3:18:00PM Units Dilution Batch Y (Soil) Arsenic Lead /17/ /18/2017 Page 47 of 57

116 Project Number: [none] MS20 (0-6) 5/15/2017 3:30:00PM Units Dilution Batch Y (Soil) Arsenic Lead /17/ /18/2017 Page 48 of 57

117 Project Number: [none] MS20 (6-24) 5/15/2017 3:32:00PM Units Dilution Batch Y (Soil) Arsenic Lead /17/ /18/2017 Page 49 of 57

118 Project Number: [none] MS21 (0-6) 5/15/2017 3:35:00PM Units Dilution Batch Y (Soil) Arsenic Lead /17/ /18/2017 Page 50 of 57

119 Project Number: [none] MS21 (6-24) 5/15/2017 3:37:00PM Units Dilution Batch Y (Soil) Arsenic Lead /17/ /18/2017 Page 51 of 57

120 Project Number: [none] MS27 (0-6) 5/15/2017 3:05:00PM Units Dilution Batch Y (Soil) TCLP Metals by 1311/6010C Lead mg/l /26/ /26/2017 J Arsenic Lead /17/ /18/2017 Page 52 of 57

121 Project Number: [none] MS27 (6-24) 5/15/2017 3:08:00PM Units Dilution Batch Y (Soil) Arsenic Lead /17/ /18/2017 Page 53 of 57

122 Project Number: [none] TCLP Metals by 1311/6010C - Quality Control Analyte Result Units Spike Level Source Result %REC %REC s RPD RPD Notes Batch SW A MS ( S) Prepared: 07/26/2017 Analyzed: 07/26/2017 Source: Y Lead mg/l TB ( BLK) Prepared: 07/26/2017 Analyzed: 07/26/2017 Lead ND mg/l - U BLANK ( BLK) Prepared: 07/26/2017 Analyzed: 07/26/2017 Lead ND mg/l - U LCS ( BKS) Prepared: 07/26/2017 Analyzed: 07/27/2017 Lead mg/l DUP ( D) Prepared: 07/26/2017 Analyzed: 07/26/2017 Source: Y Lead mg/l J Page 54 of 57

123 Project Number: [none] - Quality Control Analyte Result Units Spike Level Source Result %REC %REC s RPD RPD Notes Batch SW B BLANK ( BLK) Prepared: 05/17/2017 Analyzed: 05/18/2017 Arsenic ND 2.77 mg/kg - U Lead ND " - U LCS ( BKS) Prepared: 05/17/2017 Analyzed: 05/18/2017 Arsenic mg/kg Lead " DUP ( D) Prepared: 05/17/2017 Analyzed: 05/18/2017 Source: Y Arsenic mg/kg dry Lead " MS ( S) Prepared: 05/17/2017 Analyzed: 05/18/2017 Source: Y Arsenic mg/kg dry Lead " BLANK ( BLK) Prepared: 05/17/2017 Analyzed: 05/18/2017 Lead ND mg/kg - U Arsenic ND 2.93 " - U LCS ( BKS) Prepared: 05/17/2017 Analyzed: 05/18/2017 Arsenic mg/kg Lead " DUP ( D) Prepared: 05/17/2017 Analyzed: 05/18/2017 Source: Y Arsenic mg/kg dry Lead " MS ( S) Prepared: 05/17/2017 Analyzed: 05/18/2017 Source: Y Arsenic mg/kg dry Page 55 of 57

124 Project Number: [none] - Quality Control Analyte Result Units Spike Level Source Result %REC %REC s RPD RPD Notes Batch SW B MS ( S) Prepared: 05/17/2017 Analyzed: 05/18/2017 Source: Y Lead mg/kg dry BLANK ( BLK) Prepared: 05/17/2017 Analyzed: 05/18/2017 Lead ND mg/kg - U Arsenic ND 2.81 " - U LCS ( BKS) Prepared: 05/17/2017 Analyzed: 05/18/2017 Arsenic mg/kg Lead " DUP ( D) Prepared: 05/17/2017 Analyzed: 05/18/2017 Source: Y Arsenic mg/kg dry Lead " MS ( S) Prepared: 05/17/2017 Analyzed: 05/18/2017 Source: Y Arsenic mg/kg dry Lead " PS ( S) Prepared: 05/17/2017 Analyzed: 05/19/2017 Source: Y Lead mg/kg dry PS ( S) Prepared: 05/17/2017 Analyzed: 05/19/2017 Source: Y Lead mg/kg dry Page 56 of 57

125 Project Number: [none] Notes and Definitions U Result not detected above the detection limit J Greater than the detection limit but less than the reporting limit ND Analyte NOT DETECTED at or above the reporting limit RPD Relative Percent Difference All soil results are reported on a wet weight basis. Page 57 of 57

126 Appendix C EPA Regional Screening Levels EPA Toxicity Characteristic Maximum Concentration of Contaminants Shallow Interval Soil Metal Sampling 39th Avenue Channel Project Area Denver, Colorado

127 Regional Screening Level (RSL) Summary Table (TR=1E 06, HQ=0.1) June 2017 Key: I = IRIS; P = PPRTV; D = DWSHA; O = OPP; A = ATSDR; C = Cal EPA; X = APPENDIX PPRTV SCREEN (See FAQ #29); H = HEAST; F = See FAQ; E = see user guide Section 2.3.5; L = see user guide on lead; M = mutagen; S = see user guide Section 5; V = volatile; R = RBA applied (See User Guide for Arsenic notice) ; c = cancer; n = noncancer; * = where: n SL < 100X c SL; ** = where n SL < 10X c SL; SSL values are based on DAF=1; m = Concentration may exceed ceiling limit (See User Guide); s = Concentration may exceed Csat (See User Guide) Toxicity and Chemical-specific Information Contaminant Screening Levels Protection of Ground Water SSLs SFO k e IUR k e RfD o k e RfC i k v e o mutagen C sat Resident Soil Industrial Soil Resident Air Industrial Air Tapwater MCL Risk-based SSL MCL-based SSL (mg/kg-day) -1 y (ug/m 3 ) -1 y (mg/kg-day) y (mg/m 3 ) y l GIABS ABS (mg/kg) Analyte CAS No. (mg/kg) key (mg/kg) key (ug/m 3 ) key (ug/m 3 ) key (ug/l) key (ug/l) (mg/kg) key (mg/kg) 1.2E-03 O Acephate E+00 n 9.8E+01 n 2.4E+00 n 5.3E-04 n 2.2E-06 I 9.0E-03 I V 1 1.1E+05 Acetaldehyde E+00 n 3.4E+01 n 9.4E-01 n 3.9E+00 n 1.9E+00 n 3.8E-04 n 2.0E-02 I Acetochlor E+02 n 1.6E+03 n 3.5E+01 n 2.8E-02 n 9.0E-01 I 3.1E+01 A V 1 1.1E+05 Acetone E+03 n 6.7E+04 n 3.2E+03 n 1.4E+04 n 1.4E+03 n 2.9E-01 n 2.0E-03 X Acetone Cyanohydrin E+05 nm 1.2E+06 nm 2.1E-01 n 8.8E-01 n 6.0E-02 I V 1 1.3E+05 Acetonitrile E+01 n 3.4E+02 n 6.3E+00 n 2.6E+01 n 1.3E+01 n 2.6E-03 n 1.0E-01 I V 1 2.5E+03 Acetophenone E+02 n 1.2E+04 ns 1.9E+02 n 5.8E-02 n 3.8E+00 C 1.3E-03 C Acetylaminofluorene, E-01 c 6.0E-01 c 2.2E-03 c 9.4E-03 c 1.6E-02 c 7.2E-05 c 5.0E-04 I 2.0E-05 I V 1 2.3E+04 Acrolein E-02 n 6.0E-02 n 2.1E-03 n 8.8E-03 n 4.2E-03 n 8.4E-07 n 5.0E-01 I 1.0E-04 I 2.0E-03 I 6.0E-03 I M Acrylamide E-01 c* 4.6E+00 c* 1.0E-02 c* 1.2E-01 c* 5.0E-02 c* 1.1E-05 c* 5.0E-01 I 1.0E-03 I V 1 1.1E+05 Acrylic Acid E+00 n 4.2E+01 n 1.0E-01 n 4.4E-01 n 2.1E-01 n 4.2E-05 n 5.4E-01 I 6.8E-05 I 4.0E-02 A 2.0E-03 I V 1 1.1E+04 Acrylonitrile E-01 c** 1.1E+00 c** 4.1E-02 c** 1.8E-01 c** 5.2E-02 c** 1.1E-05 c** 6.0E-03 P Adiponitrile E+05 nm 3.6E+06 nm 6.3E-01 n 2.6E+00 n 5.6E-02 C 1.0E-02 I Alachlor E+00 c** 4.1E+01 c* 1.1E+00 c* 2.0E E-04 c* 1.6E E-03 I Aldicarb E+00 n 8.2E+01 n 2.0E+00 n 3.0E E-04 n 7.5E E-03 I Aldicarb Sulfone E+00 n 8.2E+01 n 2.0E+00 n 2.0E E-04 n 4.4E Aldicarb sulfoxide E E E+01 I 4.9E-03 I 3.0E-05 I V 1 Aldrin E-02 c** 1.8E-01 c* 5.7E-04 c 2.5E-03 c 9.2E-04 c* 1.5E-04 c* 5.0E-03 I 1.0E-04 X V 1 1.1E+05 Allyl Alcohol E-01 n 1.5E+00 n 1.0E-02 n 4.4E-02 n 2.1E-02 n 4.2E-06 n 2.1E-02 C 6.0E-06 C 1.0E-03 I V 1 1.4E+03 Allyl Chloride E-01 n 6.9E-01 n 1.0E-01 n 4.4E-01 n 2.1E-01 n 6.7E-05 n 1.0E+00 P 5.0E-03 P 1 Aluminum E+03 n 1.1E+05 nm 5.2E-01 n 2.2E+00 n 2.0E+03 n 3.0E+03 n 4.0E-04 I 1 Aluminum Phosphide E+00 n 4.7E+01 n 8.0E-01 n n 9.0E-03 I Ametryn E+01 n 7.4E+02 n 1.5E+01 n 1.6E-02 n 2.1E+01 C 6.0E-03 C Aminobiphenyl, E-02 c 1.1E-01 c 4.7E-04 c 2.0E-03 c 3.0E-03 c 1.5E-05 c 8.0E-02 P Aminophenol, m E+02 n 6.6E+03 n 1.6E+02 n 6.1E-02 n 4.0E-03 X Aminophenol, o E+01 n 3.3E+02 n 7.9E+00 n 3.0E-03 n 2.0E-02 P Aminophenol, p E+02 n 1.6E+03 n 4.0E+01 n 1.5E-02 n 2.5E-03 I Amitraz E+01 n 2.1E+02 n 8.2E-01 n 4.2E-01 n 5.0E-01 I V 1 Ammonia E+01 n 2.2E+02 n 2.0E-01 I 1 Ammonium Sulfamate E+03 n 2.3E+04 n 4.0E+02 n n 3.0E-03 X V 1 1.4E+04 Amyl Alcohol, tert E+00 n 3.4E+01 n 3.1E-01 n 1.3E+00 n 6.3E-01 n 1.3E-04 n 5.7E-03 I 1.6E-06 C 7.0E-03 P 1.0E-03 I Aniline E+01 n 4.0E+02 c** 1.0E-01 n 4.4E-01 n 1.3E+01 c** 4.6E-03 c** 4.0E-02 P 2.0E-03 X Anthraquinone, 9, E+01 n 5.7E+01 c** 1.4E+00 c** 1.4E-02 c** 4.0E-04 I 0.15 Antimony (metallic) E+00 n 4.7E+01 n 7.8E-01 n 6.0E E-02 n 2.7E E-04 H 0.15 Antimony Pentoxide E+00 n 5.8E+01 n 9.7E-01 n n 4.0E-04 H 0.15 Antimony Tetroxide E+00 n 4.7E+01 n 7.8E-01 n n 2.0E-04 I 0.15 Antimony Trioxide E+04 n 1.2E+05 nm 2.1E-02 n 8.8E-02 n 1.5E+00 I 4.3E-03 I 3.0E-04 I 1.5E-05 C Arsenic, Inorganic E-01 c**r 3.0E+00 c*r 6.5E-04 c** 2.9E-03 c** 5.2E-02 c* 1.0E E-03 c* 2.9E E-06 C 5.0E-05 I 1 Arsine E-02 n 4.1E-01 n 5.2E-03 n 2.2E-02 n 7.0E-03 n n 3.6E-02 O Asulam E+02 n 3.0E+03 n 7.2E+01 n 1.8E-02 n 2.3E-01 C 3.5E-02 I Atrazine E+00 c* 1.0E+01 c 3.0E-01 c 3.0E E-04 c 1.9E E-01 C 2.5E-04 C Auramine E-01 c 2.6E+00 c 1.1E-02 c 4.9E-02 c 6.7E-02 c 6.1E-04 c 4.0E-04 I Avermectin B E+00 n 3.3E+01 n 8.0E-01 n 1.4E+00 n 3.0E-03 A 1.0E-02 A Azinphos-methyl E+01 n 2.5E+02 n 1.0E+00 n 4.4E+00 n 5.6E+00 n 1.7E-03 n 1.1E-01 I 3.1E-05 I V 1 Azobenzene E+00 c 2.6E+01 c 9.1E-02 c 4.0E-01 c 1.2E-01 c 9.3E-04 c 1.0E+00 P 7.0E-06 P Azodicarbonamide E+02 n 4.0E+03 n 7.3E-04 n 3.1E-03 n 2.0E+03 n 6.8E-01 n 2.0E-01 I 5.0E-04 H 0.07 Barium E+03 n 2.2E+04 n 5.2E-02 n 2.2E-01 n 3.8E+02 n 2.0E E+01 n 8.2E E-01 C 1.5E-01 C 2.0E-02 C 2.0E-04 C M Barium Chromate E-01 c 6.2E+00 c 6.8E-06 c 8.2E-05 c 4.1E-02 c c 5.0E-03 O V 1 Benfluralin E+01 n 5.8E+02 n 2.8E+00 n 9.4E-02 n 5.0E-02 I Benomyl E+02 n 4.1E+03 n 9.7E+01 n 8.5E-02 n 2.0E-01 I Bensulfuron-methyl E+03 n 1.6E+04 n 3.9E+02 n 1.0E-01 n 3.0E-02 I Bentazon E+02 n 2.5E+03 n 5.7E+01 n 1.2E-02 n 4.0E-03 P 1.0E-01 I V 1 1.2E+03 Benzaldehyde E+02 c** 8.2E+02 c* 1.9E+01 c* 4.1E-03 c* 5.5E-02 I 7.8E-06 I 4.0E-03 I 3.0E-02 I V 1 1.8E+03 Benzene E+00 c** 5.1E+00 c** 3.6E-01 c** 1.6E+00 c** 4.6E-01 c** 5.0E E-04 c** 2.6E E-01 X 3.0E-04 X Benzenediamine-2-methyl sulfate, 1, E+00 n 2.3E+01 c** 6.0E-01 n 1.7E-04 n 1.0E-03 P V 1 1.3E+03 Benzenethiol E+00 n 1.2E+02 n 1.7E+00 n 1.1E-03 n 2.3E+02 I 6.7E-02 I 3.0E-03 I M Benzidine E-04 c 1.0E-02 c 1.5E-05 c 1.8E-04 c 1.1E-04 c 2.8E-07 c 4.0E+00 I Benzoic Acid E+04 n 3.3E+05 nm 7.5E+03 n 1.5E+00 n 1.3E+01 I V 1 3.2E+02 Benzotrichloride E-02 c 2.5E-01 c 3.0E-03 c 6.6E-06 c 1.0E-01 P Benzyl Alcohol E+02 n 8.2E+03 n 2.0E+02 n 4.8E-02 n 1.7E-01 I 4.9E-05 C 2.0E-03 P 1.0E-03 P V 1 1.5E+03 Benzyl Chloride E+00 c** 4.8E+00 c** 5.7E-02 c** 2.5E-01 c** 8.9E-02 c** 9.8E-05 c** 2.4E-03 I 2.0E-03 I 2.0E-05 I Beryllium and compounds E+01 n 2.3E+02 n 1.2E-03 c** 5.1E-03 c** 2.5E+00 n 4.0E E+00 n 3.2E E-03 P Bifenox E+01 n 7.4E+02 n 1.0E+01 n 7.6E-02 n 1.5E-02 I Biphenthrin E+01 n 1.2E+03 n 3.0E+01 n 1.4E+02 n 8.0E-03 I 5.0E-01 I 4.0E-04 X V 1 Biphenyl, 1,1' E+00 n 2.0E+01 n 4.2E-02 n 1.8E-01 n 8.3E-02 n 8.7E-04 n 4.0E-02 I V 1 1.0E+03 Bis(2-chloro-1-methylethyl) ether E+02 n 4.7E+03 ns 7.1E+01 n 2.6E-02 n 3.0E-03 P Bis(2-chloroethoxy)methane E+01 n 2.5E+02 n 5.9E+00 n 1.3E-03 n 1.1E+00 I 3.3E-04 I V 1 5.1E+03 Bis(2-chloroethyl)ether E-01 c 1.0E+00 c 8.5E-03 c 3.7E-02 c 1.4E-02 c 3.6E-06 c 2.2E+02 I 6.2E-02 I V 1 4.2E+03 Bis(chloromethyl)ether E-05 c 3.6E-04 c 4.5E-05 c 2.0E-04 c 7.2E-05 c 1.7E-08 c 5.0E-02 I Bisphenol A E+02 n 4.1E+03 n 7.7E+01 n 5.8E+00 n 2.0E-01 I 2.0E-02 H 1 Boron And Borates Only E+03 n 2.3E+04 n 2.1E+00 n 8.8E+00 n 4.0E+02 n 1.3E+00 n 2.0E+00 P 2.0E-02 P V 1 Boron Trichloride E+04 n 2.3E+05 nm 2.1E+00 n 8.8E+00 n 4.2E+00 n n 4.0E-02 C 1.3E-02 C V 1 Boron Trifluoride E+02 n 4.7E+03 n 1.4E+00 n 5.7E+00 n 2.6E+00 n n 7.0E-01 I 4.0E-03 I 1 Bromate E-01 c* 4.7E+00 c 1.1E-01 c* 1.0E E-04 c* 7.7E E+00 X 6.0E-04 X V 1 2.4E+03 Bromo-2-chloroethane, E-02 c 1.1E-01 c 4.7E-03 c 2.0E-02 c 7.4E-03 c 2.1E-06 c 8.0E-03 I 6.0E-02 I V 1 6.8E+02 Bromobenzene E+01 n 1.8E+02 n 6.3E+00 n 2.6E+01 n 6.2E+00 n 4.2E-03 n Page 1 of 11

128 Regional Screening Level (RSL) Summary Table (TR=1E 06, HQ=0.1) June 2017 Key: I = IRIS; P = PPRTV; D = DWSHA; O = OPP; A = ATSDR; C = Cal EPA; X = APPENDIX PPRTV SCREEN (See FAQ #29); H = HEAST; F = See FAQ; E = see user guide Section 2.3.5; L = see user guide on lead; M = mutagen; S = see user guide Section 5; V = volatile; R = RBA applied (See User Guide for Arsenic notice) ; c = cancer; n = noncancer; * = where: n SL < 100X c SL; ** = where n SL < 10X c SL; SSL values are based on DAF=1; m = Concentration may exceed ceiling limit (See User Guide); s = Concentration may exceed Csat (See User Guide) Toxicity and Chemical-specific Information Contaminant Screening Levels Protection of Ground Water SSLs SFO k e IUR k e RfD o k e RfC i k v e o mutagen C sat Resident Soil Industrial Soil Resident Air Industrial Air Tapwater MCL Risk-based SSL MCL-based SSL (mg/kg-day) -1 y (ug/m 3 ) -1 y (mg/kg-day) y (mg/m 3 ) y l GIABS ABS (mg/kg) Analyte CAS No. (mg/kg) key (mg/kg) key (ug/m 3 ) key (ug/m 3 ) key (ug/l) key (ug/l) (mg/kg) key (mg/kg) 4.0E-02 X V 1 4.0E+03 Bromochloromethane E+01 n 6.3E+01 n 4.2E+00 n 1.8E+01 n 8.3E+00 n 2.1E-03 n 6.2E-02 I 3.7E-05 C 2.0E-02 I V 1 9.3E+02 Bromodichloromethane E-01 c 1.3E+00 c 7.6E-02 c 3.3E-01 c 1.3E-01 c 8.0E+01(F) 3.6E-05 c 2.2E E-03 I 1.1E-06 I 2.0E-02 I V 1 9.2E+02 Bromoform E+01 c** 8.6E+01 c* 2.6E+00 c 1.1E+01 c 3.3E+00 c* 8.0E+01(F) 8.7E-04 c* 2.1E E-03 I 5.0E-03 I V 1 3.6E+03 Bromomethane E-01 n 3.0E+00 n 5.2E-01 n 2.2E+00 n 7.5E-01 n 1.9E-04 n 5.0E-03 H V 1 Bromophos E+01 n 5.8E+02 n 3.5E+00 n 1.5E-02 n 1.0E-01 O 1.5E-02 O Bromoxynil E+00 c* 2.2E+01 c* 6.1E-01 c* 5.2E-04 c* 1.5E-02 O V 1 Bromoxynil Octanoate E+02 n 1.8E+03 n 1.0E+01 n 9.0E-02 n 3.4E+00 C 3.0E-05 I 2.0E-03 I V 1 6.7E+02 Butadiene, 1, E-02 c** 2.6E-01 c** 9.4E-02 c** 4.1E-01 c** 1.8E-02 c* 9.9E-06 c* 3.0E-02 O Butanoic acid, 4-(2,4-dichlorophenoxy) E+02 n 2.5E+03 n 4.5E+01 n 4.2E-02 n 1.0E-01 I V 1 7.6E+03 Butanol, N E+02 n 1.2E+04 ns 2.0E+02 n 4.1E-02 n 2.0E+00 P 3.0E+01 P V 1 2.1E+04 Butyl alcohol, sec E+04 n 1.5E+05 nms 3.1E+03 n 1.3E+04 n 2.4E+03 n 5.0E-01 n 5.0E-02 I V 1 Butylate E+02 n 5.8E+03 n 4.6E+01 n 4.5E-02 n 2.0E-04 C 5.7E-08 C Butylated hydroxyanisole E+03 c 1.1E+04 c 4.9E+01 c 2.2E+02 c 1.5E+02 c 2.9E-01 c 3.6E-03 P 3.0E-01 P Butylated hydroxytoluene E+02 c* 6.4E+02 c* 3.4E+00 c* 1.0E-01 c* 5.0E-02 P V 1 1.1E+02 Butylbenzene, n E+02 ns 5.8E+03 ns 1.0E+02 n 3.2E-01 n 1.0E-01 X V 1 1.5E+02 Butylbenzene, sec E+02 ns 1.2E+04 ns 2.0E+02 n 5.9E-01 n 1.0E-01 X V 1 1.8E+02 Butylbenzene, tert E+02 ns 1.2E+04 ns 6.9E+01 n 1.6E-01 n 2.0E-02 A Cacodylic Acid E+02 n 1.6E+03 n 4.0E+01 n 1.1E-02 n 1.8E-03 I 1.0E-03 I 1.0E-05 A Cadmium (Diet) E+00 n 9.8E+01 n 1.8E-03 I 5.0E-04 I 1.0E-05 A Cadmium (Water) E-03 n 4.4E-03 n 9.2E-01 n 5.0E E-02 n 3.8E E-01 C 1.5E-01 C 2.0E-02 C 2.0E-04 C M Calcium Chromate E-01 c 6.2E+00 c 6.8E-06 c 8.2E-05 c 4.1E-02 c c 5.0E-01 I 2.2E-03 C Caprolactam E+03 n 4.0E+04 n 2.3E-01 n 9.6E-01 n 9.9E+02 n 2.5E-01 n 1.5E-01 C 4.3E-05 C 2.0E-03 I Captafol E+00 c** 1.5E+01 c* 6.5E-02 c 2.9E-01 c 4.0E-01 c** 7.1E-04 c** 2.3E-03 C 6.6E-07 C 1.3E-01 I Captan E+02 c** 1.0E+03 c* 4.3E+00 c 1.9E+01 c 3.1E+01 c** 2.2E-02 c** 1.0E-01 I Carbaryl E+02 n 8.2E+03 n 1.8E+02 n 1.7E-01 n 5.0E-03 I Carbofuran E+01 n 4.1E+02 n 9.4E+00 n 4.0E E-03 n 1.6E E-01 I 7.0E-01 I V 1 7.4E+02 Carbon Disulfide E+01 n 3.5E+02 n 7.3E+01 n 3.1E+02 n 8.1E+01 n 2.4E-02 n 7.0E-02 I 6.0E-06 I 4.0E-03 I 1.0E-01 I V 1 4.6E+02 Carbon Tetrachloride E-01 c* 2.9E+00 c* 4.7E-01 c* 2.0E+00 c* 4.6E-01 c* 5.0E E-04 c* 1.9E E-01 P V 1 5.9E+03 Carbonyl Sulfide E+00 n 2.8E+01 n 1.0E+01 n 4.4E+01 n 2.1E+01 n 5.1E-02 n 1.0E-02 I Carbosulfan E+01 n 8.2E+02 n 5.1E+00 n 1.2E-01 n 1.0E-01 I Carboxin E+02 n 8.2E+03 n 1.9E+02 n 1.0E-01 n 9.0E-04 I 1 Ceric oxide E+05 nm 5.4E+05 nm 9.4E-02 n 3.9E-01 n 1.0E-01 I V 1 Chloral Hydrate E+02 n 1.2E+04 n 2.0E+02 n 4.0E-02 n 1.5E-02 I Chloramben E+01 n 1.2E+03 n 2.9E+01 n 7.0E-03 n 4.0E-01 H Chloranil E+00 c 5.7E+00 c 1.8E-01 c 1.5E-04 c 3.5E-01 I 1.0E-04 I 5.0E-04 I 7.0E-04 I V Chlordane E+00 c** 7.7E+00 c** 2.8E-02 c** 1.2E-01 c** 2.0E-02 c** 2.0E E-03 c** 2.7E E+01 I 4.6E-03 C 3.0E-04 I Chlordecone (Kepone) E-02 c* 2.3E-01 c 6.1E-04 c 2.7E-03 c 3.5E-03 c* 1.2E-04 c* 7.0E-04 A Chlorfenvinphos E+00 n 5.7E+01 n 1.1E+00 n 3.1E-03 n 9.0E-02 O Chlorimuron, Ethyl E+02 n 7.4E+03 n 1.8E+02 n 6.0E-02 n 1.0E-01 I 1.5E-04 A V 1 2.8E+03 Chlorine E-02 n 7.8E-02 n 1.5E-02 n 6.4E-02 n 3.0E-02 n 1.4E-05 n 3.0E-02 I 2.0E-04 I V 1 Chlorine Dioxide E+02 n 3.4E+03 n 2.1E-02 n 8.8E-02 n 4.2E-02 n n 3.0E-02 I 1 Chlorite (Sodium Salt) E+02 n 3.5E+03 n 6.0E+01 n 1.0E+03 n 5.0E+01 I V 1 1.2E+03 Chloro-1,1-difluoroethane, E+03 ns 2.3E+04 ns 5.2E+03 n 2.2E+04 n 1.0E+04 n 5.2E+00 n 3.0E-04 I 2.0E-02 H 2.0E-02 I V 1 7.9E+02 Chloro-1,3-butadiene, E-02 c 4.4E-02 c 9.4E-03 c 4.1E-02 c 1.9E-02 c 9.8E-06 c 4.6E-01 H Chloro-2-methylaniline HCl, E+00 c 5.0E+00 c 1.7E-01 c 1.5E-04 c 1.0E-01 P 7.7E-05 C 3.0E-03 X Chloro-2-methylaniline, E+00 c** 2.3E+01 c* 3.6E-02 c 1.6E-01 c 7.0E-01 c** 4.0E-04 c** 2.7E-01 X V 1 1.2E+04 Chloroacetaldehyde, E+00 c 1.2E+01 c 2.9E-01 c 5.8E-05 c Chloroacetic Acid E E E-05 I Chloroacetophenone, E+03 n 1.8E+04 n 3.1E-03 n 1.3E-02 n 2.0E-01 P 4.0E-03 I Chloroaniline, p E+00 c** 1.1E+01 c* 3.7E-01 c* 1.6E-04 c* 2.0E-02 I 5.0E-02 P V 1 7.6E+02 Chlorobenzene E+01 n 1.3E+02 n 5.2E+00 n 2.2E+01 n 7.8E+00 n 1.0E E-03 n 6.8E E-01 X Chlorobenzene sulfonic acid, p E+02 n 8.2E+03 n 2.0E+02 n 4.7E-02 n 1.1E-01 C 3.1E-05 C 2.0E-02 I Chlorobenzilate E+00 c* 2.1E+01 c* 9.1E-02 c 4.0E-01 c 3.1E-01 c* 1.0E-03 c* 3.0E-02 X Chlorobenzoic Acid, p E+02 n 2.5E+03 n 5.1E+01 n 1.3E-02 n 3.0E-03 P 3.0E-01 P V 1 2.9E+02 Chlorobenzotrifluoride, E+01 n 2.5E+02 n 3.1E+01 n 1.3E+02 n 3.5E+00 n 1.2E-02 n 4.0E-02 P V 1 7.3E+02 Chlorobutane, E+02 n 4.7E+03 ns 6.4E+01 n 2.6E-02 n 5.0E+01 I V 1 1.7E+03 Chlorodifluoromethane E+03 ns 2.1E+04 ns 5.2E+03 n 2.2E+04 n 1.0E+04 n 4.3E+00 n 2.0E-02 P V 1 1.1E+05 Chloroethanol, E+02 n 2.3E+03 n 4.0E+01 n 8.1E-03 n 3.1E-02 C 2.3E-05 I 1.0E-02 I 9.8E-02 A V 1 2.5E+03 Chloroform E-01 c* 1.4E+00 c* 1.2E-01 c* 5.3E-01 c* 2.2E-01 c* 8.0E+01(F) 6.1E-05 c* 2.2E E-02 I V 1 1.3E+03 Chloromethane E+01 n 4.6E+01 n 9.4E+00 n 3.9E+01 n 1.9E+01 n 4.9E-03 n 2.4E+00 C 6.9E-04 C V 1 9.3E+03 Chloromethyl Methyl Ether E-02 c 8.9E-02 c 4.1E-03 c 1.8E-02 c 6.5E-03 c 1.4E-06 c 3.0E-01 P 3.0E-03 P 1.0E-05 X Chloronitrobenzene, o E+00 c* 7.7E+00 c* 1.0E-03 n 4.4E-03 n 2.4E-01 c* 2.2E-04 c* 6.0E-02 P 7.0E-04 P 2.0E-03 P Chloronitrobenzene, p E+00 n 3.8E+01 c** 2.1E-01 n 8.8E-01 n 1.2E+00 c** 1.1E-03 c** 5.0E-03 I V 1 2.7E+04 Chlorophenol, E+01 n 5.8E+02 n 9.1E+00 n 8.9E-03 n 4.0E-04 C V 1 6.2E+02 Chloropicrin E-01 n 8.2E-01 n 4.2E-02 n 1.8E-01 n 8.3E-02 n 2.5E-05 n 3.1E-03 C 8.9E-07 C 1.5E-02 I Chlorothalonil E+01 n 7.4E+02 c** 3.2E+00 c 1.4E+01 c 2.2E+01 c** 5.0E-02 c** 2.0E-02 I V 1 9.1E+02 Chlorotoluene, o E+02 n 2.3E+03 ns 2.4E+01 n 2.3E-02 n 2.0E-02 X V 1 2.5E+02 Chlorotoluene, p E+02 n 2.3E+03 ns 2.5E+01 n 2.4E-02 n 2.4E+02 C 6.9E-02 C Chlorozotocin E-03 c 9.6E-03 c 4.1E-05 c 1.8E-04 c 3.2E-04 c 7.1E-08 c 5.0E-02 O Chlorpropham E+02 n 4.1E+03 n 7.1E+01 n 6.4E-02 n 1.0E-03 A Chlorpyrifos E+00 n 8.2E+01 n 8.4E-01 n 1.2E-02 n 1.0E-02 H Chlorpyrifos Methyl E+01 n 8.2E+02 n 1.2E+01 n 5.4E-02 n 2.0E-02 O Chlorsulfuron E+02 n 1.6E+03 n 3.9E+01 n 3.3E-02 n 1.0E-02 I Chlorthal-dimethyl E+01 n 8.2E+02 n 1.2E+01 n 1.5E-02 n 8.0E-04 H Chlorthiophos E+00 n 6.6E+01 n 2.8E-01 n 7.3E-03 n 1.5E+00 I Chromium(III), Insoluble Salts E+04 n 1.8E+05 nm 2.2E+03 n 4.0E+06 n Page 2 of 11

129 Regional Screening Level (RSL) Summary Table (TR=1E 06, HQ=0.1) June 2017 Key: I = IRIS; P = PPRTV; D = DWSHA; O = OPP; A = ATSDR; C = Cal EPA; X = APPENDIX PPRTV SCREEN (See FAQ #29); H = HEAST; F = See FAQ; E = see user guide Section 2.3.5; L = see user guide on lead; M = mutagen; S = see user guide Section 5; V = volatile; R = RBA applied (See User Guide for Arsenic notice) ; c = cancer; n = noncancer; * = where: n SL < 100X c SL; ** = where n SL < 10X c SL; SSL values are based on DAF=1; m = Concentration may exceed ceiling limit (See User Guide); s = Concentration may exceed Csat (See User Guide) Toxicity and Chemical-specific Information Contaminant Screening Levels Protection of Ground Water SSLs SFO k e IUR k e RfD o k e RfC i k v e o mutagen C sat Resident Soil Industrial Soil Resident Air Industrial Air Tapwater MCL Risk-based SSL MCL-based SSL (mg/kg-day) -1 y (ug/m 3 ) -1 y (mg/kg-day) y (mg/m 3 ) y l GIABS ABS (mg/kg) Analyte CAS No. (mg/kg) key (mg/kg) key (ug/m 3 ) key (ug/m 3 ) key (ug/l) key (ug/l) (mg/kg) key (mg/kg) 5.0E-01 C 8.4E-02 S 3.0E-03 I 1.0E-04 I M Chromium(VI) E-01 c* 6.3E+00 c* 1.2E-05 c 1.5E-04 c 3.5E-02 c 6.7E-04 c Chromium, Total E E E-02 I Clofentezine E+01 n 1.1E+03 n 2.3E+01 n 1.4E+00 n 9.0E-03 P 3.0E-04 P 6.0E-06 P 1 Cobalt E+00 n 3.5E+01 n 3.1E-04 c** 1.4E-03 c** 6.0E-01 n 2.7E-02 n 6.2E-04 I V M 1 Coke Oven Emissions E-03 c 2.0E-02 c 4.0E-02 H 1 Copper E+02 n 4.7E+03 n 8.0E+01 n 1.3E E+00 n 4.6E E-02 I 6.0E-01 C Cresol, m E+02 n 4.1E+03 n 6.3E+01 n 2.6E+02 n 9.3E+01 n 7.4E-02 n 5.0E-02 I 6.0E-01 C Cresol, o E+02 n 4.1E+03 n 6.3E+01 n 2.6E+02 n 9.3E+01 n 7.5E-02 n 1.0E-01 A 6.0E-01 C Cresol, p E+02 n 8.2E+03 n 6.3E+01 n 2.6E+02 n 1.9E+02 n 1.5E-01 n 1.0E-01 A Cresol, p-chloro-m E+02 n 8.2E+03 n 1.4E+02 n 1.7E-01 n 1.0E-01 A 6.0E-01 C Cresols E+02 n 8.2E+03 n 6.3E+01 n 2.6E+02 n 1.5E+02 n 1.3E-01 n 1.9E+00 H 1.0E-03 P V 1 1.7E+04 Crotonaldehyde, trans E-01 c* 1.7E+00 c* 4.0E-02 c* 8.2E-06 c* 1.0E-01 I 4.0E-01 I V 1 2.7E+02 Cumene E+02 n 9.9E+02 ns 4.2E+01 n 1.8E+02 n 4.5E+01 n 7.4E-02 n 2.2E-01 C 6.3E-05 C Cupferron E+00 c 1.0E+01 c 4.5E-02 c 1.9E-01 c 3.5E-01 c 6.1E-04 c 8.4E-01 H 2.0E-03 H Cyanazine E-01 c* 2.7E+00 c* 8.8E-02 c* 4.1E-05 c* Cyanides 1.0E-03 I 1 ~Calcium Cyanide E+00 n 1.2E+02 n 2.0E+00 n n 5.0E-03 I 1 ~Copper Cyanide E+01 n 5.8E+02 n 1.0E+01 n n 6.0E-04 I 8.0E-04 S V 1 9.5E+05 ~Cyanide (CN-) E+00 n 1.5E+01 n 8.3E-02 n 3.5E-01 n 1.5E-01 n 2.0E E-03 n 2.0E E-03 I V 1 ~Cyanogen E+00 n 1.2E+02 n 2.0E+00 n n 9.0E-02 I V 1 ~Cyanogen Bromide E+02 n 1.1E+04 n 1.8E+02 n n 5.0E-02 I V 1 ~Cyanogen Chloride E+02 n 5.8E+03 n 1.0E+02 n n 6.0E-04 I 8.0E-04 I V 1 1.0E+07 ~Hydrogen Cyanide E+00 n 1.5E+01 n 8.3E-02 n 3.5E-01 n 1.5E-01 n 1.5E-03 n 2.0E-03 I 1 ~Potassium Cyanide E+01 n 2.3E+02 n 4.0E+00 n n 5.0E-03 I 0.04 ~Potassium Silver Cyanide E+01 n 5.8E+02 n 8.2E+00 n n 1.0E-01 I 0.04 ~Silver Cyanide E+02 n 1.2E+04 n 1.8E+02 n n 1.0E-03 I 1 ~Sodium Cyanide E+00 n 1.2E+02 n 2.0E+00 n 2.0E+02 n 2.0E-04 P 1 ~Thiocyanates E E+00 n 2.3E+01 n 4.0E-01 n n 2.0E-04 X V 1 ~Thiocyanic Acid E+00 n 2.3E+01 n 4.0E-01 n n 5.0E-02 I 1 ~Zinc Cyanide E+02 n 5.8E+03 n 1.0E+02 n n 6.0E+00 I V 1 1.2E+02 Cyclohexane E+02 ns 2.7E+03 ns 6.3E+02 n 2.6E+03 n 1.3E+03 n 1.3E+00 n 2.0E-02 X 2.0E-02 X Cyclohexane, 1,2,3,4,5-pentabromo-6-chloro E+01 c** 1.1E+02 c* 2.8E+00 c* 1.6E-02 c* 5.0E+00 I 7.0E-01 P V 1 5.1E+03 Cyclohexanone E+03 n 1.3E+04 ns 7.3E+01 n 3.1E+02 n 1.4E+02 n 3.4E-02 n 5.0E-03 P 1.0E+00 X V 1 2.8E+02 Cyclohexene E+01 n 3.1E+02 ns 1.0E+02 n 4.4E+02 n 7.0E+00 n 4.6E-03 n 2.0E-01 I V 1 2.9E+05 Cyclohexylamine E+03 n 2.3E+04 n 3.8E+02 n 1.0E-01 n 2.5E-02 I Cyfluthrin E+02 n 2.1E+03 n 1.2E+01 n 3.1E+00 n 1.0E-03 O Cyhalothrin E+00 n 8.2E+01 n 2.0E+00 n 1.4E+00 n 6.0E-02 O Cypermethrin E+02 n 4.9E+03 n 1.2E+02 n 1.9E+01 n 1.5E-02 O Cyromazine E+01 n 1.2E+03 n 3.0E+01 n 7.6E-03 n 2.4E-01 I 6.9E-05 C DDD E+00 c 9.6E+00 c 4.1E-02 c 1.8E-01 c 3.2E-02 c 7.5E-03 c 3.4E-01 I 9.7E-05 C V 1 DDE, p,p' E+00 c 9.3E+00 c 2.9E-02 c 1.3E-01 c 4.6E-02 c 1.1E-02 c 3.4E-01 I 9.7E-05 I 5.0E-04 I DDT E+00 c** 8.5E+00 c** 2.9E-02 c 1.3E-01 c 2.3E-01 c** 7.7E-02 c** 3.0E-02 I Dalapon E+02 n 2.5E+03 n 6.0E+01 n 2.0E E-02 n 4.1E E-02 C 5.1E-06 C 1.5E-01 I Daminozide E+01 c* 1.3E+02 c* 5.5E-01 c 2.4E+00 c 4.3E+00 c* 9.5E-04 c* 7.0E-04 I 7.0E-03 I Decabromodiphenyl ether, 2,2',3,3',4,4',5,5',6,6'- (BDE-209) E+01 n 5.7E+02 n 1.4E+01 n 7.8E+00 n 4.0E-05 I Demeton E-01 n 3.3E+00 n 4.2E-02 n n 1.2E-03 I 6.0E-01 I Di(2-ethylhexyl)adipate E+02 c** 1.9E+03 c* 6.5E+01 c* 4.0E E+00 c* 2.9E E-02 H Diallate E+00 c 3.8E+01 c 5.4E-01 c 8.0E-04 c 7.0E-04 A Diazinon E+00 n 5.7E+01 n 1.0E+00 n 6.5E-03 n 1.0E-02 X V 1 Dibenzothiophene E+01 n 1.2E+03 n 6.5E+00 n 1.2E-01 n 8.0E-01 P 6.0E-03 P 2.0E-04 P 2.0E-04 I V M 1 9.8E+02 Dibromo-3-chloropropane, 1, E-03 c* 6.4E-02 c* 1.7E-04 c 2.0E-03 c* 3.3E-04 c 2.0E E-07 c 8.6E E-04 X V 1 1.6E+02 Dibromobenzene, 1, E+00 n 4.7E+01 n 5.3E-01 n 5.1E-04 n 1.0E-02 I V 1 Dibromobenzene, 1, E+01 n 1.2E+03 n 1.3E+01 n 1.2E-02 n 8.4E-02 I 2.0E-02 I V 1 8.0E+02 Dibromochloromethane E+00 c* 3.9E+01 c* 8.7E-01 c* 8.0E+01(F) 2.3E-04 c* 2.1E E+00 I 6.0E-04 I 9.0E-03 I 9.0E-03 I V 1 1.3E+03 Dibromoethane, 1, E-02 c 1.6E-01 c 4.7E-03 c 2.0E-02 c 7.5E-03 c 5.0E E-06 c 1.4E E-03 X V 1 2.8E+03 Dibromomethane (Methylene Bromide) E+00 n 9.9E+00 n 4.2E-01 n 1.8E+00 n 8.3E-01 n 2.1E-04 n 3.0E-04 P Dibutyltin Compounds E E+00 n 2.5E+01 n 6.0E-01 n n 3.0E-02 I Dicamba E+02 n 2.5E+03 n 5.7E+01 n 1.5E-02 n 4.2E-03 P V 1 5.5E+02 Dichloro-2-butene, 1, E-03 c 9.4E-03 c 6.7E-04 c 2.9E-03 c 1.3E-03 c 6.6E-07 c 4.2E-03 P V 1 5.2E+02 Dichloro-2-butene, cis-1, E-03 c 3.2E-02 c 6.7E-04 c 2.9E-03 c 1.3E-03 c 6.2E-07 c 4.2E-03 P V 1 7.6E+02 Dichloro-2-butene, trans-1, E-03 c 3.2E-02 c 6.7E-04 c 2.9E-03 c 1.3E-03 c 6.2E-07 c 5.0E-02 I 4.0E-03 I Dichloroacetic Acid E+01 c** 4.6E+01 c** 1.5E+00 c** 6.0E E-04 c** 1.2E E-02 I 2.0E-01 H V 1 3.8E+02 Dichlorobenzene, 1, E+02 n 9.3E+02 ns 2.1E+01 n 8.8E+01 n 3.0E+01 n 6.0E E-02 n 5.8E E-03 C 1.1E-05 C 7.0E-02 A 8.0E-01 I V 1 Dichlorobenzene, 1, E+00 c 1.1E+01 c 2.6E-01 c 1.1E+00 c 4.8E-01 c 7.5E E-04 c 7.2E E-01 I 3.4E-04 C Dichlorobenzidine, 3,3' E+00 c 5.1E+00 c 8.3E-03 c 3.6E-02 c 1.3E-01 c 8.2E-04 c 9.0E-03 X Dichlorobenzophenone, 4,4' E+01 n 7.4E+02 n 7.8E+00 n 4.7E-02 n 2.0E-01 I 1.0E-01 X V 1 8.5E+02 Dichlorodifluoromethane E+00 n 3.7E+01 n 1.0E+01 n 4.4E+01 n 2.0E+01 n 3.0E-02 n 5.7E-03 C 1.6E-06 C 2.0E-01 P V 1 1.7E+03 Dichloroethane, 1, E+00 c 1.6E+01 c 1.8E+00 c 7.7E+00 c 2.8E+00 c 7.8E-04 c 9.1E-02 I 2.6E-05 I 6.0E-03 X 7.0E-03 P V 1 3.0E+03 Dichloroethane, 1, E-01 c** 2.0E+00 c** 1.1E-01 c** 4.7E-01 c** 1.7E-01 c** 5.0E E-05 c** 1.4E E-02 I 2.0E-01 I V 1 1.2E+03 Dichloroethylene, 1, E+01 n 1.0E+02 n 2.1E+01 n 8.8E+01 n 2.8E+01 n 7.0E E-02 n 2.5E E-03 I V 1 2.4E+03 Dichloroethylene, 1,2-cis E+01 n 2.3E+02 n 3.6E+00 n 7.0E E-03 n 2.1E E-02 I V 1 1.9E+03 Dichloroethylene, 1,2-trans E+02 n 2.3E+03 ns 3.6E+01 n 1.0E E-02 n 3.1E E-03 I Dichlorophenol, 2, E+01 n 2.5E+02 n 4.6E+00 n 2.3E-03 n 1.0E-02 I Dichlorophenoxy Acetic Acid, 2, E+01 n 9.6E+02 n 1.7E+01 n 7.0E E-03 n 1.8E E-02 P 3.7E-05 P 4.0E-02 P 4.0E-03 I V 1 1.4E+03 Dichloropropane, 1, E-01 c** 1.2E+00 c** 7.6E-02 c** 3.3E-01 c** 1.4E-01 c** 5.0E E-05 c** 1.7E E-02 P V 1 1.5E+03 Dichloropropane, 1, E+02 n 2.3E+03 ns 3.7E+01 n 1.3E-02 n Page 3 of 11

130 Regional Screening Level (RSL) Summary Table (TR=1E 06, HQ=0.1) June 2017 Key: I = IRIS; P = PPRTV; D = DWSHA; O = OPP; A = ATSDR; C = Cal EPA; X = APPENDIX PPRTV SCREEN (See FAQ #29); H = HEAST; F = See FAQ; E = see user guide Section 2.3.5; L = see user guide on lead; M = mutagen; S = see user guide Section 5; V = volatile; R = RBA applied (See User Guide for Arsenic notice) ; c = cancer; n = noncancer; * = where: n SL < 100X c SL; ** = where n SL < 10X c SL; SSL values are based on DAF=1; m = Concentration may exceed ceiling limit (See User Guide); s = Concentration may exceed Csat (See User Guide) Toxicity and Chemical-specific Information Contaminant Screening Levels Protection of Ground Water SSLs SFO k e IUR k e RfD o k e RfC i k v e o mutagen C sat Resident Soil Industrial Soil Resident Air Industrial Air Tapwater MCL Risk-based SSL MCL-based SSL (mg/kg-day) -1 y (ug/m 3 ) -1 y (mg/kg-day) y (mg/m 3 ) y l GIABS ABS (mg/kg) Analyte CAS No. (mg/kg) key (mg/kg) key (ug/m 3 ) key (ug/m 3 ) key (ug/l) key (ug/l) (mg/kg) key (mg/kg) 3.0E-03 I Dichloropropanol, 2, E+01 n 2.5E+02 n 5.9E+00 n 1.3E-03 n 1.0E-01 I 4.0E-06 I 3.0E-02 I 2.0E-02 I V 1 1.6E+03 Dichloropropene, 1, E+00 c** 8.2E+00 c** 7.0E-01 c** 3.1E+00 c** 4.7E-01 c** 1.7E-04 c** 2.9E-01 I 8.3E-05 C 5.0E-04 I 5.0E-04 I Dichlorvos E+00 c** 7.9E+00 c** 3.4E-02 c** 1.5E-01 c** 2.6E-01 c** 8.1E-05 c** 7.0E-05 O Dicrotophos E-01 n 5.7E+00 n 1.4E-01 n 3.3E-05 n 8.0E-02 P 3.0E-04 X V 1 2.6E+02 Dicyclopentadiene E-01 n 5.4E-01 n 3.1E-02 n 1.3E-01 n 6.3E-02 n 2.2E-04 n 1.6E+01 I 4.6E-03 I 5.0E-05 I Dieldrin E-02 c** 1.4E-01 c* 6.1E-04 c 2.7E-03 c 1.8E-03 c* 7.1E-05 c* 3.0E-04 C 5.0E-03 I Diesel Engine Exhaust E E-03 c* 4.1E-02 c* 2.0E-03 P 2.0E-04 P Diethanolamine E+01 n 1.6E+02 n 2.1E-02 n 8.8E-02 n 4.0E+00 n 8.1E-04 n 3.0E-02 P 1.0E-04 P Diethylene Glycol Monobutyl Ether E+02 n 2.4E+03 n 1.0E-02 n 4.4E-02 n 6.0E+01 n 1.3E-02 n 6.0E-02 P 3.0E-04 P Diethylene Glycol Monoethyl Ether E+02 n 4.8E+03 n 3.1E-02 n 1.3E-01 n 1.2E+02 n 2.4E-02 n 1.0E-03 P V 1 1.1E+05 Diethylformamide E+00 n 1.2E+02 n 2.0E+00 n 4.1E-04 n 3.5E+02 C 1.0E-01 C Diethylstilbestrol E-03 c 6.6E-03 c 2.8E-05 c 1.2E-04 c 5.1E-05 c 2.8E-05 c 8.3E-02 O Difenzoquat E+02 n 6.8E+03 n 1.7E+02 n 2.6E+01 n 2.0E-02 I Diflubenzuron E+02 n 1.6E+03 n 2.9E+01 n 3.3E-02 n 4.0E+01 I V 1 1.4E+03 Difluoroethane, 1, E+03 ns 2.0E+04 ns 4.2E+03 n 1.8E+04 n 8.3E+03 n 2.8E+00 n 4.4E-02 C 1.3E-05 C V 1 Dihydrosafrole E+00 c 4.5E+01 c 2.2E-01 c 9.4E-01 c 3.0E-01 c 1.9E-04 c 7.0E-01 P V 1 2.3E+03 Diisopropyl Ether E+02 n 9.4E+02 n 7.3E+01 n 3.1E+02 n 1.5E+02 n 3.7E-02 n 8.0E-02 I V 1 5.3E+02 Diisopropyl Methylphosphonate E+02 ns 9.3E+03 ns 1.6E+02 n 4.5E-02 n 2.2E-02 O Dimethipin E+02 n 1.8E+03 n 4.4E+01 n 9.6E-03 n 2.2E-03 O Dimethoate E+01 n 1.8E+02 n 4.4E+00 n 9.9E-04 n 1.6E+00 P Dimethoxybenzidine, 3,3' E-01 c 1.4E+00 c 4.7E-02 c 5.8E-05 c 1.7E-03 P 6.0E-02 P Dimethyl methylphosphonate E+02 c** 1.4E+03 c** 4.6E+01 c** 9.6E-03 c** 4.6E+00 C 1.3E-03 C Dimethylamino azobenzene [p-] E-01 c 5.0E-01 c 2.2E-03 c 9.4E-03 c 5.0E-03 c 2.1E-05 c 5.8E-01 H Dimethylaniline HCl, 2, E-01 c 4.0E+00 c 1.3E-01 c 1.2E-04 c 2.0E-01 P 2.0E-03 X Dimethylaniline, 2, E+00 c** 1.1E+01 c* 3.7E-01 c* 2.1E-04 c* 2.7E-02 P 2.0E-03 I V 1 8.3E+02 Dimethylaniline, N,N E+01 n 1.2E+02 c** 2.5E+00 c** 9.0E-04 c** 1.1E+01 P Dimethylbenzidine, 3,3' E-02 c 2.1E-01 c 6.5E-03 c 4.3E-05 c 1.0E-01 P 3.0E-02 I V 1 1.1E+05 Dimethylformamide E+02 n 1.5E+03 n 3.1E+00 n 1.3E+01 n 6.1E+00 n 1.2E-03 n 1.0E-04 X 2.0E-06 X V 1 1.7E+05 Dimethylhydrazine, 1, E-03 n 2.4E-02 n 2.1E-04 n 8.8E-04 n 4.2E-04 n 9.3E-08 n 5.5E+02 C 1.6E-01 C V 1 1.9E+05 Dimethylhydrazine, 1, E-04 c 4.1E-03 c 1.8E-05 c 7.7E-05 c 2.8E-05 c 6.5E-09 c 2.0E-02 I Dimethylphenol, 2, E+02 n 1.6E+03 n 3.6E+01 n 4.2E-02 n 6.0E-04 I Dimethylphenol, 2, E+00 n 4.9E+01 n 1.1E+00 n 1.3E-03 n 1.0E-03 I Dimethylphenol, 3, E+00 n 8.2E+01 n 1.8E+00 n 2.1E-03 n 4.5E-02 C 1.3E-05 C V 1 4.7E+02 Dimethylvinylchloride E+00 c 4.8E+00 c 2.2E-01 c 9.4E-01 c 3.3E-01 c 1.1E-04 c 8.0E-05 X Dinitro-o-cresol, 4, E-01 n 6.6E+00 n 1.5E-01 n 2.6E-04 n 2.0E-03 I Dinitro-o-cyclohexyl Phenol, 4, E+01 n 1.6E+02 n 2.3E+00 n 7.7E-02 n 1.0E-04 P Dinitrobenzene, 1, E-01 n 8.2E+00 n 1.9E-01 n 1.8E-04 n 1.0E-04 I Dinitrobenzene, 1, E-01 n 8.2E+00 n 2.0E-01 n 1.8E-04 n 1.0E-04 P Dinitrobenzene, 1, E-01 n 8.2E+00 n 2.0E-01 n 1.8E-04 n 2.0E-03 I Dinitrophenol, 2, E+01 n 1.6E+02 n 3.9E+00 n 4.4E-03 n 6.8E-01 I Dinitrotoluene Mixture, 2,4/2,6- E E-01 c 3.4E+00 c 1.1E-01 c 1.5E-04 c 3.1E-01 C 8.9E-05 C 2.0E-03 I Dinitrotoluene, 2, E+00 c** 7.4E+00 c* 3.2E-02 c 1.4E-01 c 2.4E-01 c* 3.2E-04 c* 1.5E+00 P 3.0E-04 X Dinitrotoluene, 2, E-01 c** 1.5E+00 c* 4.9E-02 c* 6.7E-05 c* 2.0E-03 S Dinitrotoluene, 2-Amino-4, E+01 n 2.3E+02 n 3.9E+00 n 3.0E-03 n 2.0E-03 S Dinitrotoluene, 4-Amino-2, E+01 n 2.3E+02 n 3.9E+00 n 3.0E-03 n 4.5E-01 X 9.0E-04 X Dinitrotoluene, Technical grade E+00 c** 5.1E+00 c* 1.0E-01 c* 1.4E-04 c* 1.0E-03 I Dinoseb E+00 n 8.2E+01 n 1.5E+00 n 7.0E E-02 n 6.2E E-01 I 5.0E-06 I 3.0E-02 I 3.0E-02 I V 1 1.2E+05 Dioxane, 1, E+00 c* 2.4E+01 c* 5.6E-01 c** 2.5E+00 c** 4.6E-01 c* 9.4E-05 c* Dioxins 6.2E+03 I 1.3E+00 I ~Hexachlorodibenzo-p-dioxin, Mixture 1.0E-04 c 4.7E-04 c 2.2E-06 c 9.4E-06 c 1.3E-05 c 1.7E-05 c 1.3E+05 C 3.8E+01 C 7.0E-10 I 4.0E-08 C V ~TCDD, 2,3,7, E-06 c** 2.2E-05 c** 7.4E-08 c* 3.2E-07 c* 1.2E-07 c* 3.0E E-08 c* 1.5E E-02 I Diphenamid E+02 n 2.5E+03 n 5.3E+01 n 5.2E-01 n 8.0E-04 X Diphenyl Sulfone E+00 n 6.6E+01 n 1.5E+00 n 3.6E-03 n 1.0E-01 O Diphenylamine E+02 n 8.2E+03 n 1.3E+02 n 2.3E-01 n 8.0E-01 I 2.2E-04 I Diphenylhydrazine, 1, E-01 c 2.9E+00 c 1.3E-02 c 5.6E-02 c 7.8E-02 c 2.5E-04 c 2.2E-03 I Diquat E+01 n 1.8E+02 n 4.4E+00 n 2.0E E-02 n 3.7E E+00 C 1.4E-01 C Direct Black E-02 c 3.2E-01 c 2.0E-05 c 8.8E-05 c 1.1E-02 c 5.3E+00 c 7.4E+00 C 1.4E-01 C Direct Blue E-02 c 3.1E-01 c 2.0E-05 c 8.8E-05 c 1.1E-02 c 1.7E+01 c 6.7E+00 C 1.4E-01 C Direct Brown E-02 c 3.4E-01 c 2.0E-05 c 8.8E-05 c 1.2E-02 c 1.6E-01 c 4.0E-05 I Disulfoton E-01 n 3.3E+00 n 5.0E-02 n 9.4E-05 n 1.0E-02 I V 1 Dithiane, 1, E+01 n 1.2E+03 n 2.0E+01 n 9.7E-03 n 2.0E-03 I Diuron E+01 n 1.6E+02 n 3.6E+00 n 1.5E-03 n 2.0E-02 O Dodine E+02 n 1.6E+03 n 4.0E+01 n 2.1E-01 n 5.0E-02 O V 1 EPTC E+02 n 5.8E+03 n 7.5E+01 n 4.0E-02 n 6.0E-03 I V 1 Endosulfan E+01 n 7.0E+02 n 1.0E+01 n 1.4E-01 n 2.0E-02 I Endothall E+02 n 1.6E+03 n 3.8E+01 n 1.0E E-03 n 2.4E E-04 I Endrin E+00 n 2.5E+01 n 2.3E-01 n 2.0E E-03 n 8.1E E-03 I 1.2E-06 I 6.0E-03 P 1.0E-03 I V 1 1.1E+04 Epichlorohydrin E+00 n 8.2E+00 n 1.0E-01 n 4.4E-01 n 2.0E-01 n 4.5E-05 n 2.0E-02 I V 1 1.5E+04 Epoxybutane, 1, E+01 n 6.7E+01 n 2.1E+00 n 8.8E+00 n 4.2E+00 n 9.2E-04 n 4.0E-02 P Ethanol, 2-(2-methoxyethoxy) E+02 n 3.3E+03 n 8.0E+01 n 1.6E-02 n 5.0E-03 I Ethephon E+01 n 4.1E+02 n 1.0E+01 n 2.1E-03 n 5.0E-04 I Ethion E+00 n 4.1E+01 n 4.3E-01 n 8.5E-04 n 1.0E-01 P 6.0E-02 P V 1 2.4E+04 Ethoxyethanol Acetate, E+02 n 1.4E+03 n 6.3E+00 n 2.6E+01 n 1.2E+01 n 2.5E-03 n 9.0E-02 P 2.0E-01 I V 1 1.1E+05 Ethoxyethanol, E+02 n 4.7E+03 n 2.1E+01 n 8.8E+01 n 3.4E+01 n 6.8E-03 n 9.0E-01 I 7.0E-02 P V 1 1.1E+04 Ethyl Acetate E+01 n 2.6E+02 n 7.3E+00 n 3.1E+01 n 1.4E+01 n 3.1E-03 n 5.0E-03 P 8.0E-03 P V 1 2.5E+03 Ethyl Acrylate E+00 n 2.1E+01 n 8.3E-01 n 3.5E+00 n 1.4E+00 n 3.2E-04 n Page 4 of 11

131 Regional Screening Level (RSL) Summary Table (TR=1E 06, HQ=0.1) June 2017 Key: I = IRIS; P = PPRTV; D = DWSHA; O = OPP; A = ATSDR; C = Cal EPA; X = APPENDIX PPRTV SCREEN (See FAQ #29); H = HEAST; F = See FAQ; E = see user guide Section 2.3.5; L = see user guide on lead; M = mutagen; S = see user guide Section 5; V = volatile; R = RBA applied (See User Guide for Arsenic notice) ; c = cancer; n = noncancer; * = where: n SL < 100X c SL; ** = where n SL < 10X c SL; SSL values are based on DAF=1; m = Concentration may exceed ceiling limit (See User Guide); s = Concentration may exceed Csat (See User Guide) Toxicity and Chemical-specific Information Contaminant Screening Levels Protection of Ground Water SSLs SFO k e IUR k e RfD o k e RfC i k v e o mutagen C sat Resident Soil Industrial Soil Resident Air Industrial Air Tapwater MCL Risk-based SSL MCL-based SSL (mg/kg-day) -1 y (ug/m 3 ) -1 y (mg/kg-day) y (mg/m 3 ) y l GIABS ABS (mg/kg) Analyte CAS No. (mg/kg) key (mg/kg) key (ug/m 3 ) key (ug/m 3 ) key (ug/l) key (ug/l) (mg/kg) key (mg/kg) 1.0E+01 I V 1 2.1E+03 Ethyl Chloride (Chloroethane) E+03 n 5.7E+03 ns 1.0E+03 n 4.4E+03 n 2.1E+03 n 5.9E-01 n 2.0E-01 I V 1 1.0E+04 Ethyl Ether E+03 n 2.3E+04 ns 3.9E+02 n 8.8E-02 n 3.0E-01 P V 1 1.1E+03 Ethyl Methacrylate E+02 n 7.6E+02 n 3.1E+01 n 1.3E+02 n 6.3E+01 n 1.5E-02 n 1.0E-05 I Ethyl-p-nitrophenyl Phosphonate E-02 n 8.2E-01 n 8.9E-03 n 2.8E-04 n 1.1E-02 C 2.5E-06 C 1.0E-01 I 1.0E+00 I V 1 4.8E+02 Ethylbenzene E+00 c* 2.5E+01 c* 1.1E+00 c* 4.9E+00 c* 1.5E+00 c* 7.0E E-03 c* 7.8E E-02 P Ethylene Cyanohydrin E+02 n 5.7E+03 n 1.4E+02 n 2.8E-02 n 9.0E-02 P V 1 1.9E+05 Ethylene Diamine E+02 n 1.1E+04 n 1.8E+02 n 4.1E-02 n 2.0E+00 I 4.0E-01 C Ethylene Glycol E+04 n 1.6E+05 nm 4.2E+01 n 1.8E+02 n 4.0E+03 n 8.1E-01 n 1.0E-01 I 1.6E+00 I Ethylene Glycol Monobutyl Ether E+02 n 8.2E+03 n 1.7E+02 n 7.0E+02 n 2.0E+02 n 4.1E-02 n 3.1E-01 C 3.0E-03 I 3.0E-02 C V M 1 1.2E+05 Ethylene Oxide E-03 c 2.5E-02 c 3.4E-04 c 4.1E-03 c 6.7E-04 c 1.4E-07 c 4.5E-02 C 1.3E-05 C 8.0E-05 I Ethylene Thiourea E-01 n 6.6E+00 n 2.2E-01 c 9.4E-01 c 1.6E-01 n 3.6E-05 n 6.5E+01 C 1.9E-02 C V 1 1.5E+05 Ethyleneimine E-03 c 1.2E-02 c 1.5E-04 c 6.5E-04 c 2.4E-04 c 5.2E-08 c 3.0E+00 I Ethylphthalyl Ethyl Glycolate E+04 n 2.5E+05 nm 5.8E+03 n 1.3E+01 n 2.5E-04 I Fenamiphos E+00 n 2.1E+01 n 4.4E-01 n 4.3E-04 n 2.5E-02 I Fenpropathrin E+02 n 2.1E+03 n 6.4E+00 n 2.9E-01 n 2.5E-02 I Fenvalerate E+02 n 2.1E+03 n 5.0E+01 n 3.2E+01 n 1.3E-02 I Fluometuron E+01 n 1.1E+03 n 2.4E+01 n 1.9E-02 n 4.0E-02 C 1.3E-02 C 1 Fluoride E+02 n 4.7E+03 n 1.4E+00 n 5.7E+00 n 8.0E+01 n 1.2E+01 n 6.0E-02 I 1.3E-02 C 1 Fluorine (Soluble Fluoride) E+02 n 7.0E+03 n 1.4E+00 n 5.7E+00 n 1.2E+02 n 4.0E E+01 n 6.0E E-02 I Fluridone E+02 n 6.6E+03 n 1.4E+02 n 1.6E+01 n 1.5E-02 O Flurprimidol E+01 n 1.2E+03 n 2.6E+01 n 1.2E-01 n 2.0E-03 O Flusilazole E+01 n 1.6E+02 n 3.1E+00 n 5.1E-01 n 5.0E-01 O Flutolanil E+03 n 4.1E+04 n 7.9E+02 n 4.2E+00 n 1.0E-02 I Fluvalinate E+01 n 8.2E+02 n 2.0E+01 n 2.9E+01 n 9.0E-02 O Folpet E+02 n 7.4E+03 n 1.6E+02 n 3.9E-02 n 2.5E-03 O Fomesafen E+01 n 2.1E+02 n 4.8E+00 n 1.6E-02 n 2.0E-03 I Fonofos E+01 n 1.6E+02 n 2.4E+00 n 4.7E-03 n 1.3E-05 I 2.0E-01 I 9.8E-03 A V 1 4.2E+04 Formaldehyde E+01 c** 7.3E+01 c** 2.2E-01 c** 9.4E-01 c** 4.3E-01 c** 8.7E-05 c** 9.0E-01 P 3.0E-04 X V 1 1.1E+05 Formic Acid E+00 n 1.2E+01 n 3.1E-02 n 1.3E-01 n 6.3E-02 n 1.3E-05 n 2.5E+00 O Fosetyl-AL E+04 n 2.1E+05 nm 5.0E+03 n 6.6E+01 n Furans 1.0E-03 X V ~Dibenzofuran E+00 n 1.0E+02 n 7.9E-01 n 1.5E-02 n 1.0E-03 I V E+03 ~Furan E+00 n 1.0E+02 n 1.9E+00 n 7.3E-04 n 9.0E-01 I 2.0E+00 I V E+05 ~Tetrahydrofuran E+03 n 9.4E+03 n 2.1E+02 n 8.8E+02 n 3.4E+02 n 7.5E-02 n 3.8E+00 H Furazolidone E-01 c 6.0E-01 c 2.0E-02 c 3.9E-05 c 3.0E-03 I 5.0E-02 H V 1 1.0E+04 Furfural E+01 n 2.6E+02 n 5.2E+00 n 2.2E+01 n 3.8E+00 n 8.1E-04 n 1.5E+00 C 4.3E-04 C Furium E-01 c 1.5E+00 c 6.5E-03 c 2.9E-02 c 5.1E-02 c 6.8E-05 c 3.0E-02 I 8.6E-06 C Furmecyclox E+01 c 7.7E+01 c 3.3E-01 c 1.4E+00 c 1.1E+00 c 1.2E-03 c 6.0E-03 O Glufosinate, Ammonium E+01 n 4.9E+02 n 1.2E+01 n 2.6E-03 n 8.0E-05 C Glutaraldehyde E+04 n 4.8E+04 n 8.3E-03 n 3.5E-02 n 4.0E-04 I 1.0E-03 H V 1 1.1E+05 Glycidyl E+00 n 2.1E+01 n 1.0E-01 n 4.4E-01 n 1.7E-01 n 3.3E-05 n 1.0E-01 I Glyphosate E+02 n 8.2E+03 n 2.0E+02 n 7.0E E-01 n 3.1E E-02 X V 1 Guanidine E+01 n 1.2E+03 n 2.0E+01 n 4.5E-03 n 2.0E-02 P Guanidine Chloride E+02 n 1.6E+03 n 4.0E+01 n n 3.0E-02 X Guanidine Nitrate E+02 n 2.5E+03 n 6.0E+01 n 1.5E-02 n 5.0E-05 I Haloxyfop, Methyl E-01 n 4.1E+00 n 7.6E-02 n 8.4E-04 n 4.5E+00 I 1.3E-03 I 5.0E-04 I V 1 Heptachlor E-01 c* 6.3E-01 c* 2.2E-03 c 9.4E-03 c 1.4E-03 c* 4.0E E-04 c* 3.3E E+00 I 2.6E-03 I 1.3E-05 I V 1 Heptachlor Epoxide E-02 c** 3.3E-01 c** 1.1E-03 c 4.7E-03 c 1.4E-03 c** 2.0E E-05 c** 4.1E E-04 X 4.0E-01 P V 1 5.8E+01 Heptane, N E+00 n 2.9E+01 n 4.2E+01 n 1.8E+02 n 6.0E-01 n 4.8E-03 n 2.0E-03 I V 1 Hexabromobenzene E+01 n 2.3E+02 n 4.0E+00 n 2.3E-02 n 2.0E-04 I Hexabromodiphenyl ether, 2,2',4,4',5,5'- (BDE-153) E+00 n 1.6E+01 n 4.0E-01 n n 1.6E+00 I 4.6E-04 I 8.0E-04 I V 1 Hexachlorobenzene E-01 c* 9.6E-01 c* 6.1E-03 c 2.7E-02 c 9.8E-03 c 1.0E E-04 c 1.3E E-02 I 2.2E-05 I 1.0E-03 P V 1 1.7E+01 Hexachlorobutadiene E+00 c** 5.3E+00 c* 1.3E-01 c 5.6E-01 c 1.4E-01 c** 2.7E-04 c** 6.3E+00 I 1.8E-03 I 8.0E-03 A Hexachlorocyclohexane, Alpha E-02 c 3.6E-01 c 1.6E-03 c 6.8E-03 c 7.2E-03 c 4.2E-05 c 1.8E+00 I 5.3E-04 I Hexachlorocyclohexane, Beta E-01 c 1.3E+00 c 5.3E-03 c 2.3E-02 c 2.5E-02 c 1.5E-04 c 1.1E+00 C 3.1E-04 C 3.0E-04 I Hexachlorocyclohexane, Gamma- (Lindane) E-01 c** 2.5E+00 c* 9.1E-03 c 4.0E-02 c 4.2E-02 c** 2.0E E-04 c** 1.2E E+00 I 5.1E-04 I Hexachlorocyclohexane, Technical E-01 c 1.3E+00 c 5.5E-03 c 2.4E-02 c 2.5E-02 c 1.5E-04 c 6.0E-03 I 2.0E-04 I V 1 1.6E+01 Hexachlorocyclopentadiene E-01 n 7.5E-01 n 2.1E-02 n 8.8E-02 n 4.1E-02 n 5.0E E-04 n 1.6E E-02 I 1.1E-05 C 7.0E-04 I 3.0E-02 I V 1 Hexachloroethane E+00 c** 8.0E+00 c** 2.6E-01 c* 1.1E+00 c* 3.3E-01 c** 2.0E-04 c** 3.0E-04 I Hexachlorophene E+00 n 2.5E+01 n 6.0E-01 n 8.0E-01 n 1.1E-01 I 3.0E-03 I Hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) E+00 c** 2.8E+01 c* 7.0E-01 c** 2.7E-04 c** 1.0E-05 I V 1 3.4E+03 Hexamethylene Diisocyanate, 1, E-01 n 1.3E+00 n 1.0E-03 n 4.4E-03 n 2.1E-03 n 2.1E-05 n 4.0E-04 P Hexamethylphosphoramide E+00 n 3.3E+01 n 8.0E-01 n 1.8E-04 n 7.0E-01 I V 1 1.4E+02 Hexane, N E+01 n 2.5E+02 ns 7.3E+01 n 3.1E+02 n 1.5E+02 n 1.0E+00 n 2.0E+00 P Hexanedioic Acid E+04 n 1.6E+05 nm 4.0E+03 n 9.9E-01 n 5.0E-03 I 3.0E-02 I V 1 3.3E+03 Hexanone, E+01 n 1.3E+02 n 3.1E+00 n 1.3E+01 n 3.8E+00 n 8.8E-04 n 3.3E-02 I Hexazinone E+02 n 2.7E+03 n 6.4E+01 n 3.0E-02 n 2.5E-02 I Hexythiazox E+02 n 2.1E+03 n 1.1E+01 n 5.0E-02 n 1.7E-02 O Hydramethylnon E+02 n 1.4E+03 n 3.4E+01 n 1.2E+04 n 3.0E+00 I 4.9E-03 I 3.0E-05 P V 1 Hydrazine E-01 c 1.1E+00 c 5.7E-04 c** 2.5E-03 c** 1.1E-03 c** c** 3.0E+00 I 4.9E-03 I 1 Hydrazine Sulfate E-01 c 1.1E+00 c 5.7E-04 c 2.5E-03 c 2.6E-02 c c 2.0E-02 I V 1 Hydrogen Chloride E+06 nm 1.2E+07 nm 2.1E+00 n 8.8E+00 n 4.2E+00 n n 4.0E-02 C 1.4E-02 C V 1 Hydrogen Fluoride E+02 n 4.7E+03 n 1.5E+00 n 6.1E+00 n 2.8E+00 n n 2.0E-03 I V 1 Hydrogen Sulfide E+05 nm 1.2E+06 nm 2.1E-01 n 8.8E-01 n 4.2E-01 n n 6.0E-02 P 4.0E-02 P Hydroquinone E+00 c* 3.8E+01 c* 1.3E+00 c* 8.7E-04 c* 6.1E-02 O 2.5E-03 O Imazalil E+00 c** 3.8E+01 c** 9.0E-01 c** 1.5E-02 c** Page 5 of 11

132 Regional Screening Level (RSL) Summary Table (TR=1E 06, HQ=0.1) June 2017 Key: I = IRIS; P = PPRTV; D = DWSHA; O = OPP; A = ATSDR; C = Cal EPA; X = APPENDIX PPRTV SCREEN (See FAQ #29); H = HEAST; F = See FAQ; E = see user guide Section 2.3.5; L = see user guide on lead; M = mutagen; S = see user guide Section 5; V = volatile; R = RBA applied (See User Guide for Arsenic notice) ; c = cancer; n = noncancer; * = where: n SL < 100X c SL; ** = where n SL < 10X c SL; SSL values are based on DAF=1; m = Concentration may exceed ceiling limit (See User Guide); s = Concentration may exceed Csat (See User Guide) Toxicity and Chemical-specific Information Contaminant Screening Levels Protection of Ground Water SSLs SFO k e IUR k e RfD o k e RfC i k v e o mutagen C sat Resident Soil Industrial Soil Resident Air Industrial Air Tapwater MCL Risk-based SSL MCL-based SSL (mg/kg-day) -1 y (ug/m 3 ) -1 y (mg/kg-day) y (mg/m 3 ) y l GIABS ABS (mg/kg) Analyte CAS No. (mg/kg) key (mg/kg) key (ug/m 3 ) key (ug/m 3 ) key (ug/l) key (ug/l) (mg/kg) key (mg/kg) 2.5E-01 I Imazaquin E+03 n 2.1E+04 n 4.9E+02 n 2.4E+00 n 2.5E+00 O Imazethapyr E+04 n 2.1E+05 nm 4.7E+03 n 4.1E+00 n 1.0E-02 A 1 Iodine E+01 n 1.2E+03 n 2.0E+01 n 1.2E+00 n 4.0E-02 I Iprodione E+02 n 3.3E+03 n 7.4E+01 n 2.2E-02 n 7.0E-01 P 1 Iron E+03 n 8.2E+04 n 1.4E+03 n 3.5E+01 n 3.0E-01 I V 1 1.0E+04 Isobutyl Alcohol E+03 n 3.5E+04 ns 5.9E+02 n 1.2E-01 n 9.5E-04 I 2.0E-01 I 2.0E+00 C Isophorone E+02 c** 2.4E+03 c** 2.1E+02 n 8.8E+02 n 7.8E+01 c** 2.6E-02 c** 1.5E-02 I V 1 Isopropalin E+02 n 1.8E+03 n 4.0E+00 n 9.2E-02 n 2.0E+00 P 2.0E-01 P V 1 1.1E+05 Isopropanol E+02 n 2.4E+03 n 2.1E+01 n 8.8E+01 n 4.1E+01 n 8.4E-03 n 1.0E-01 I Isopropyl Methyl Phosphonic Acid E+02 n 8.2E+03 n 2.0E+02 n 4.3E-02 n 5.0E-02 I Isoxaben E+02 n 4.1E+03 n 7.3E+01 n 2.0E-01 n 3.0E-01 A V 1 JP-7 E E+07 nm 1.8E+08 nm 3.1E+01 n 1.3E+02 n 6.3E+01 n n 8.0E-03 O Lactofen E+01 n 6.6E+02 n 1.0E+01 n 4.6E-01 n Lead Compounds 5.0E-01 C 1.5E-01 C 2.0E-02 C 2.0E-04 C M ~Lead Chromate E-01 c 6.2E+00 c 6.8E-06 c 8.2E-05 c 4.1E-02 c c 8.5E-03 C 1.2E-05 C 1 ~Lead Phosphate E+01 c 3.8E+02 c 2.3E-01 c 1.0E+00 c 9.1E+00 c c 8.5E-03 C 1.2E-05 C ~Lead acetate E+01 c 2.7E+02 c 2.3E-01 c 1.0E+00 c 9.2E+00 c 1.8E-03 c 1 ~Lead and Compounds E E+02 L 1.5E-01 L 1.5E+01 L 1.5E+01 L 1.4E E-03 C 1.2E-05 C ~Lead subacetate E+01 c 2.7E+02 c 2.3E-01 c 1.0E+00 c 9.2E+00 c 2.0E-03 c 1.0E-07 I V 1 2.4E+00 ~Tetraethyl Lead E-04 n 1.2E-02 n 1.3E-04 n 4.7E-07 n 5.0E-06 P V 1 3.8E+02 Lewisite E-02 n 5.8E-01 n 9.0E-03 n 3.8E-06 n 7.7E-03 O Linuron E+01 n 6.3E+02 n 1.3E+01 n 1.1E-02 n 2.0E-03 P 1 Lithium E+01 n 2.3E+02 n 4.0E+00 n 1.2E+00 n 5.0E-04 I MCPA E+00 n 4.1E+01 n 7.5E-01 n 2.0E-04 n 4.4E-03 O MCPB E+01 n 3.6E+02 n 6.5E+00 n 2.6E-03 n 1.0E-03 I MCPP E+00 n 8.2E+01 n 1.6E+00 n 4.7E-04 n 2.0E-02 I Malathion E+02 n 1.6E+03 n 3.9E+01 n 1.0E-02 n 1.0E-01 I 7.0E-04 C Maleic Anhydride E+02 n 8.0E+03 n 7.3E-02 n 3.1E-01 n 1.9E+02 n 3.8E-02 n 5.0E-01 I Maleic Hydrazide E+03 n 4.1E+04 n 1.0E+03 n 2.1E-01 n 1.0E-04 P Malononitrile E-01 n 8.2E+00 n 2.0E-01 n 4.1E-05 n 3.0E-02 H Mancozeb E+02 n 2.5E+03 n 5.4E+01 n 7.6E-02 n 5.0E-03 I Maneb E+01 n 4.1E+02 n 9.8E+00 n 1.4E-02 n 1.4E-01 I 5.0E-05 I 1 Manganese (Diet) E-02 S 5.0E-05 I 0.04 Manganese (Non-diet) E+02 n 2.6E+03 n 5.2E-03 n 2.2E-02 n 4.3E+01 n 2.8E+00 n 9.0E-05 H Mephosfolan E-01 n 7.4E+00 n 1.8E-01 n 2.6E-04 n 3.0E-02 I Mepiquat Chloride E+02 n 2.5E+03 n 6.0E+01 n 2.0E-02 n 1.1E-02 P 4.0E-03 P Mercaptobenzothiazole, E+01 n 2.1E+02 c** 6.3E+00 c** 1.8E-02 c** Mercury Compounds 3.0E-04 I 3.0E-04 S 0.07 ~Mercuric Chloride (and other Mercury salts) E+00 n 3.5E+01 n 3.1E-02 n 1.3E-01 n 5.7E-01 n 2.0E+00 n 3.0E-04 I V 1 3.1E+00 ~Mercury (elemental) E+00 n 4.6E+00 ns 3.1E-02 n 1.3E-01 n 6.3E-02 n 2.0E E-03 n 1.0E E-04 I 1 ~Methyl Mercury E-01 n 1.2E+01 n 2.0E-01 n n 8.0E-05 I ~Phenylmercuric Acetate E-01 n 6.6E+00 n 1.6E-01 n 5.0E-05 n 3.0E-05 I V 1 Merphos E-01 n 3.5E+00 n 6.0E-02 n 5.9E-03 n 1.0E-04 O Merphos Oxide E-01 n 8.2E+00 n 2.8E-02 n 1.4E-04 n 6.0E-02 I Metalaxyl E+02 n 4.9E+03 n 1.2E+02 n 3.3E-02 n 1.0E-04 I 3.0E-02 P V 1 4.6E+03 Methacrylonitrile E-01 n 1.0E+01 n 3.1E+00 n 1.3E+01 n 1.9E-01 n 4.3E-05 n 5.0E-05 I Methamidophos E-01 n 4.1E+00 n 1.0E-01 n 2.1E-05 n 2.0E+00 I 2.0E+01 I V 1 1.1E+05 Methanol E+04 n 1.2E+05 nms 2.1E+03 n 8.8E+03 n 2.0E+03 n 4.1E-01 n 1.5E-03 O Methidathion E+00 n 1.2E+02 n 2.9E+00 n 7.1E-04 n 2.5E-02 I Methomyl E+02 n 2.1E+03 n 5.0E+01 n 1.1E-02 n 4.9E-02 C 1.4E-05 C Methoxy-5-nitroaniline, E+01 c 4.7E+01 c 2.0E-01 c 8.8E-01 c 1.5E+00 c 5.3E-04 c 5.0E-03 I Methoxychlor E+01 n 4.1E+02 n 3.7E+00 n 4.0E E-01 n 2.2E E-03 P 1.0E-03 P V 1 1.2E+05 Methoxyethanol Acetate, E+01 n 5.1E+01 n 1.0E-01 n 4.4E-01 n 2.1E-01 n 4.2E-05 n 5.0E-03 P 2.0E-02 I V 1 1.1E+05 Methoxyethanol, E+01 n 3.5E+02 n 2.1E+00 n 8.8E+00 n 2.9E+00 n 5.9E-04 n 1.0E+00 X V 1 2.9E+04 Methyl Acetate E+03 n 1.2E+05 nms 2.0E+03 n 4.1E-01 n 2.0E-02 P V 1 6.8E+03 Methyl Acrylate E+01 n 6.1E+01 n 2.1E+00 n 8.8E+00 n 4.2E+00 n 8.9E-04 n 6.0E-01 I 5.0E+00 I V 1 2.8E+04 Methyl Ethyl Ketone (2-Butanone) E+03 n 1.9E+04 n 5.2E+02 n 2.2E+03 n 5.6E+02 n 1.2E-01 n 1.0E-03 X 1.0E-03 P 2.0E-05 X V 1 1.8E+05 Methyl Hydrazine E-01 n 4.4E-01 n 2.1E-03 n 8.8E-03 n 4.2E-03 n 9.4E-07 n 3.0E+00 I V 1 3.4E+03 Methyl Isobutyl Ketone (4-methyl-2-pentanone) E+03 n 1.4E+04 ns 3.1E+02 n 1.3E+03 n 6.3E+02 n 1.4E-01 n 1.0E-03 C V 1 1.0E+04 Methyl Isocyanate E-01 n 1.9E+00 n 1.0E-01 n 4.4E-01 n 2.1E-01 n 5.9E-05 n 1.4E+00 I 7.0E-01 I V 1 2.4E+03 Methyl Methacrylate E+02 n 1.9E+03 n 7.3E+01 n 3.1E+02 n 1.4E+02 n 3.0E-02 n 2.5E-04 I Methyl Parathion E+00 n 2.1E+01 n 4.5E-01 n 7.4E-04 n 6.0E-02 X Methyl Phosphonic Acid E+02 n 4.9E+03 n 1.2E+02 n 2.4E-02 n 6.0E-03 H 4.0E-02 H V 1 3.9E+02 Methyl Styrene (Mixed Isomers) E+01 n 2.6E+02 n 4.2E+00 n 1.8E+01 n 2.3E+00 n 3.8E-03 n 9.9E-02 C 2.8E-05 C Methyl methanesulfonate E+00 c 2.3E+01 c 1.0E-01 c 4.4E-01 c 7.9E-01 c 1.6E-04 c 1.8E-03 C 2.6E-07 C 3.0E+00 I V 1 8.9E+03 Methyl tert-butyl Ether (MTBE) E+01 c* 2.1E+02 c* 1.1E+01 c* 4.7E+01 c* 1.4E+01 c* 3.2E-03 c* 3.0E-04 X Methyl-1,4-benzenediamine dihydrochloride, E+00 n 2.5E+01 n 6.0E-01 n 3.6E-04 n 9.0E-03 P 2.0E-02 X Methyl-5-Nitroaniline, E+01 c** 2.6E+02 c** 8.2E+00 c** 4.6E-03 c** 8.3E+00 C 2.4E-03 C Methyl-N-nitro-N-nitrosoguanidine, N E-02 c 2.8E-01 c 1.2E-03 c 5.1E-03 c 9.4E-03 c 3.2E-06 c 1.3E-01 C 3.7E-05 C Methylaniline Hydrochloride, E+00 c 1.8E+01 c 7.6E-02 c 3.3E-01 c 6.0E-01 c 2.6E-04 c 1.0E-02 A Methylarsonic acid E+01 n 8.2E+02 n 2.0E+01 n 5.8E-03 n 2.0E-04 X Methylbenzene,1-4-diamine monohydrochloride, E+00 n 1.6E+01 n 4.0E-01 n n 1.0E-01 X 3.0E-04 X Methylbenzene-1,4-diamine sulfate, E+00 n 2.3E+01 c** 6.0E-01 n n 2.2E+01 C 6.3E-03 C M Methylcholanthrene, E-03 c 1.0E-01 c 1.6E-04 c 1.9E-03 c 1.1E-03 c 2.2E-03 c 2.0E-03 I 1.0E-08 I 6.0E-03 I 6.0E-01 I V M 1 3.3E+03 Methylene Chloride E+01 n 3.2E+02 n 6.3E+01 n 2.6E+02 n 1.1E+01 n 5.0E E-03 n 1.3E E-01 P 4.3E-04 C 2.0E-03 P M Methylene-bis(2-chloroaniline), 4,4' E+00 c* 2.3E+01 c** 2.4E-03 c 2.9E-02 c 1.6E-01 c* 1.8E-03 c* Page 6 of 11

133 Regional Screening Level (RSL) Summary Table (TR=1E 06, HQ=0.1) June 2017 Key: I = IRIS; P = PPRTV; D = DWSHA; O = OPP; A = ATSDR; C = Cal EPA; X = APPENDIX PPRTV SCREEN (See FAQ #29); H = HEAST; F = See FAQ; E = see user guide Section 2.3.5; L = see user guide on lead; M = mutagen; S = see user guide Section 5; V = volatile; R = RBA applied (See User Guide for Arsenic notice) ; c = cancer; n = noncancer; * = where: n SL < 100X c SL; ** = where n SL < 10X c SL; SSL values are based on DAF=1; m = Concentration may exceed ceiling limit (See User Guide); s = Concentration may exceed Csat (See User Guide) Toxicity and Chemical-specific Information Contaminant Screening Levels Protection of Ground Water SSLs SFO k e IUR k e RfD o k e RfC i k v e o mutagen C sat Resident Soil Industrial Soil Resident Air Industrial Air Tapwater MCL Risk-based SSL MCL-based SSL (mg/kg-day) -1 y (ug/m 3 ) -1 y (mg/kg-day) y (mg/m 3 ) y l GIABS ABS (mg/kg) Analyte CAS No. (mg/kg) key (mg/kg) key (ug/m 3 ) key (ug/m 3 ) key (ug/l) key (ug/l) (mg/kg) key (mg/kg) 4.6E-02 I 1.3E-05 C Methylene-bis(N,N-dimethyl) Aniline, 4,4' E+01 c 5.0E+01 c 2.2E-01 c 9.4E-01 c 4.8E-01 c 2.6E-03 c 1.6E+00 C 4.6E-04 C 2.0E-02 C Methylenebisbenzenamine, 4,4' E-01 c 1.4E+00 c 6.1E-03 c 2.7E-02 c 4.7E-02 c 2.1E-04 c 6.0E-04 I Methylenediphenyl Diisocyanate E+04 n 3.6E+05 nm 6.3E-02 n 2.6E-01 n 7.0E-02 H V 1 5.0E+02 Methylstyrene, Alpha E+02 ns 8.2E+03 ns 7.8E+01 n 1.2E-01 n 1.5E-01 I Metolachlor E+02 n 1.2E+04 n 2.7E+02 n 3.2E-01 n 2.5E-02 I Metribuzin E+02 n 2.1E+03 n 4.9E+01 n 1.5E-02 n 2.5E-01 I Metsulfuron-methyl E+03 n 2.1E+04 n 4.9E+02 n 1.9E-01 n 3.0E+00 P V 1 3.4E-01 Mineral oils E+04 ns 3.5E+05 nms 6.0E+03 n 2.4E+02 n 1.8E+01 C 5.1E-03 C 2.0E-04 I V 1 Mirex E-02 c* 1.7E-01 c 5.5E-04 c 2.4E-03 c 8.8E-04 c 6.3E-04 c 2.0E-03 I Molinate E+01 n 1.6E+02 n 3.0E+00 n 1.7E-03 n 5.0E-03 I 1 Molybdenum E+01 n 5.8E+02 n 1.0E+01 n 2.0E-01 n 1.0E-01 I 1 Monochloramine E+02 n 1.2E+04 n 2.0E+02 n 4.0E+03 n 2.0E-03 P Monomethylaniline E+01 n 1.6E+02 n 3.8E+00 n 1.4E-03 n 2.5E-02 I Myclobutanil E+02 n 2.1E+03 n 4.5E+01 n 5.6E-01 n 3.0E-04 X N,N'-Diphenyl-1,4-benzenediamine E+00 n 2.5E+01 n 3.6E-01 n 3.7E-02 n 2.0E-03 I V 1 Naled E+01 n 2.3E+02 n 4.0E+00 n 1.8E-03 n 3.0E-02 X 1.0E-01 P V 1 Naphtha, High Flash Aromatic (HFAN) E+02 n 3.5E+03 n 1.0E+01 n 4.4E+01 n 1.5E+01 n n 1.8E+00 C 0.0E+00 C Naphthylamine, E-01 c 1.3E+00 c 3.9E-02 c 2.0E-04 c 1.2E-01 O Napropamide E+02 n 9.8E+03 n 2.0E+02 n 1.3E+00 n 2.6E-04 C 1.1E-02 C 1.4E-05 C Nickel Acetate E+01 n 8.1E+02 n 1.5E-03 n 6.1E-03 n 2.2E+01 n 4.5E-03 n 2.6E-04 C 1.1E-02 C 1.4E-05 C Nickel Carbonate E+01 n 8.1E+02 n 1.5E-03 n 6.1E-03 n 2.2E+01 n n 2.6E-04 C 1.1E-02 C 1.4E-05 C V 1 Nickel Carbonyl E+01 n 1.1E+03 n 1.5E-03 n 6.1E-03 n 2.9E-03 n n 2.6E-04 C 1.1E-02 C 1.4E-05 C 0.04 Nickel Hydroxide E+01 n 1.1E+03 n 1.5E-03 n 6.1E-03 n 2.0E+01 n n 2.6E-04 C 1.1E-02 C 2.0E-05 C 0.04 Nickel Oxide E+01 n 1.2E+03 n 2.1E-03 n 8.8E-03 n 2.0E+01 n n 2.4E-04 I 1.1E-02 C 1.4E-05 C 0.04 Nickel Refinery Dust E E+01 n 1.1E+03 n 1.5E-03 n 6.1E-03 n 2.2E+01 n 3.2E+00 n 2.6E-04 C 2.0E-02 I 9.0E-05 A 0.04 Nickel Soluble Salts E+02 n 2.2E+03 n 9.4E-03 n 3.9E-02 n 3.9E+01 n 2.6E+00 n 1.7E+00 C 4.8E-04 I 1.1E-02 C 1.4E-05 C 0.04 Nickel Subsulfide E-01 c 1.9E+00 c 1.5E-03 n 6.1E-03 n 4.5E-02 c c 2.6E-04 C 1.1E-02 C 1.4E-05 C Nickelocene E+01 n 8.1E+02 n 1.5E-03 n 6.1E-03 n 2.2E+01 n n 1.6E+00 I 1 Nitrate E+04 n 1.9E+05 nm 3.2E+03 n 1.0E+04 n 1 Nitrate + Nitrite (as N) E E E-01 I 1 Nitrite E+02 n 1.2E+04 n 2.0E+02 n 1.0E+03 n 1.0E-02 X 5.0E-05 X Nitroaniline, E+01 n 8.0E+02 n 5.2E-03 n 2.2E-02 n 1.9E+01 n 8.0E-03 n 2.0E-02 P 4.0E-03 P 6.0E-03 P Nitroaniline, E+01 n 1.1E+02 c** 6.3E-01 n 2.6E+00 n 3.8E+00 c** 1.6E-03 c** 4.0E-05 I 2.0E-03 I 9.0E-03 I V 1 3.1E+03 Nitrobenzene E+00 c** 2.2E+01 c** 7.0E-02 c* 3.1E-01 c* 1.4E-01 c** 9.2E-05 c** 3.0E+03 P Nitrocellulose E+07 nm 2.5E+08 nm 6.0E+06 n 1.3E+03 n 7.0E-02 H Nitrofurantoin E+02 n 5.7E+03 n 1.4E+02 n 6.1E-02 n 1.3E+00 C 3.7E-04 C Nitrofurazone E-01 c 1.8E+00 c 7.6E-03 c 3.3E-02 c 6.0E-02 c 5.4E-05 c 1.7E-02 P 1.0E-04 P Nitroglycerin E-01 n 8.2E+00 n 2.0E-01 n 8.5E-05 n 1.0E-01 I Nitroguanidine E+02 n 8.2E+03 n 2.0E+02 n 4.8E-02 n 8.8E-06 P 5.0E-03 P V 1 1.8E+04 Nitromethane E+00 c** 2.4E+01 c** 3.2E-01 c** 1.4E+00 c** 6.4E-01 c** 1.4E-04 c** 2.7E-03 H 2.0E-02 I V 1 4.9E+03 Nitropropane, E-02 c 6.0E-02 c 1.0E-03 c 4.5E-03 c 2.1E-03 c 5.4E-07 c 2.7E+01 C 7.7E-03 C M Nitroso-N-ethylurea, N E-03 c 8.5E-02 c 1.3E-04 c 1.6E-03 c 9.2E-04 c 2.2E-07 c 1.2E+02 C 3.4E-02 C M Nitroso-N-methylurea, N E-03 c 1.9E-02 c 3.0E-05 c 3.6E-04 c 2.1E-04 c 4.6E-08 c 5.4E+00 I 1.6E-03 I V 1 Nitroso-di-N-butylamine, N E-02 c 4.6E-01 c 1.8E-03 c 7.7E-03 c 2.7E-03 c 5.5E-06 c 7.0E+00 I 2.0E-03 C Nitroso-di-N-propylamine, N E-02 c 3.3E-01 c 1.4E-03 c 6.1E-03 c 1.1E-02 c 8.1E-06 c 2.8E+00 I 8.0E-04 C Nitrosodiethanolamine, N E-01 c 8.2E-01 c 3.5E-03 c 1.5E-02 c 2.8E-02 c 5.6E-06 c 1.5E+02 I 4.3E-02 I M Nitrosodiethylamine, N E-04 c 1.5E-02 c 2.4E-05 c 2.9E-04 c 1.7E-04 c 6.1E-08 c 5.1E+01 I 1.4E-02 I 8.0E-06 P 4.0E-05 X V M 1 2.4E+05 Nitrosodimethylamine, N E-03 c* 3.4E-02 c* 7.2E-05 c* 8.8E-04 c* 1.1E-04 c* 2.7E-08 c* 4.9E-03 I 2.6E-06 C Nitrosodiphenylamine, N E+02 c 4.7E+02 c 1.1E+00 c 4.7E+00 c 1.2E+01 c 6.7E-02 c 2.2E+01 I 6.3E-03 C V 1 1.1E+05 Nitrosomethylethylamine, N E-02 c 9.1E-02 c 4.5E-04 c 1.9E-03 c 7.1E-04 c 2.0E-07 c 6.7E+00 C 1.9E-03 C Nitrosomorpholine [N-] E-02 c 3.4E-01 c 1.5E-03 c 6.5E-03 c 1.2E-02 c 2.8E-06 c 9.4E+00 C 2.7E-03 C Nitrosopiperidine [N-] E-02 c 2.4E-01 c 1.0E-03 c 4.5E-03 c 8.2E-03 c 4.4E-06 c 2.1E+00 I 6.1E-04 I Nitrosopyrrolidine, N E-01 c 1.1E+00 c 4.6E-03 c 2.0E-02 c 3.7E-02 c 1.4E-05 c 1.0E-04 X Nitrotoluene, m E-01 n 8.2E+00 n 1.7E-01 n 1.6E-04 n 2.2E-01 P 9.0E-04 P V 1 1.5E+03 Nitrotoluene, o E+00 c** 1.5E+01 c** 3.1E-01 c** 3.0E-04 c** 1.6E-02 P 4.0E-03 P Nitrotoluene, p E+01 n 1.4E+02 c** 4.3E+00 c** 4.0E-03 c** 3.0E-04 X 2.0E-02 P V 1 6.9E+00 Nonane, n E+00 n 7.2E+00 ns 2.1E+00 n 8.8E+00 n 5.3E-01 n 7.5E-03 n 1.5E-02 O Norflurazon E+01 n 1.2E+03 n 2.9E+01 n 1.9E-01 n 3.0E-03 I Octabromodiphenyl Ether E+01 n 2.5E+02 n 6.0E+00 n 1.2E+00 n 5.0E-02 I Octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX) E+02 n 5.7E+03 n 1.0E+02 n 1.3E-01 n 2.0E-03 H Octamethylpyrophosphoramide E+01 n 1.6E+02 n 4.0E+00 n 9.6E-04 n 7.8E-03 O 1.4E-01 O Oryzalin E+01 c* 2.9E+02 c* 7.9E+00 c* 1.5E-02 c* 5.0E-03 I Oxadiazon E+01 n 4.1E+02 n 4.7E+00 n 4.8E-02 n 2.5E-02 I Oxamyl E+02 n 2.1E+03 n 5.0E+01 n 2.0E E-02 n 4.4E E-02 O 3.0E-02 O Oxyfluorfen E+00 c* 3.1E+01 c* 5.4E-01 c* 4.3E-02 c* 1.3E-02 I Paclobutrazol E+01 n 1.1E+03 n 2.3E+01 n 4.6E-02 n 4.5E-03 I Paraquat Dichloride E+01 n 3.7E+02 n 9.0E+00 n 1.2E-01 n 6.0E-03 H Parathion E+01 n 4.9E+02 n 8.6E+00 n 4.3E-02 n 5.0E-02 H V 1 Pebulate E+02 n 5.8E+03 n 5.6E+01 n 4.5E-02 n 3.0E-02 O Pendimethalin E+02 n 2.5E+03 n 1.4E+01 n 1.6E-01 n 2.0E-03 I V 1 3.1E-01 Pentabromodiphenyl Ether E+01 ns 2.3E+02 ns 4.0E+00 n 1.7E-01 n 1.0E-04 I Pentabromodiphenyl ether, 2,2',4,4',5- (BDE-99) E-01 n 8.2E+00 n 2.0E-01 n 8.7E-03 n 8.0E-04 I V 1 Pentachlorobenzene E+00 n 9.3E+01 n 3.2E-01 n 2.4E-03 n 9.0E-02 P V 1 4.6E+02 Pentachloroethane E+00 c 3.6E+01 c 6.5E-01 c 3.1E-04 c 2.6E-01 H 3.0E-03 I V 1 Pentachloronitrobenzene E+00 c** 1.3E+01 c* 1.2E-01 c* 1.5E-03 c* 4.0E-01 I 5.1E-06 C 5.0E-03 I Pentachlorophenol E+00 c* 4.0E+00 c* 5.5E-01 c 2.4E+00 c 4.1E-02 c* 1.0E E-05 c* 1.4E-03 Page 7 of 11

134 Regional Screening Level (RSL) Summary Table (TR=1E 06, HQ=0.1) June 2017 Key: I = IRIS; P = PPRTV; D = DWSHA; O = OPP; A = ATSDR; C = Cal EPA; X = APPENDIX PPRTV SCREEN (See FAQ #29); H = HEAST; F = See FAQ; E = see user guide Section 2.3.5; L = see user guide on lead; M = mutagen; S = see user guide Section 5; V = volatile; R = RBA applied (See User Guide for Arsenic notice) ; c = cancer; n = noncancer; * = where: n SL < 100X c SL; ** = where n SL < 10X c SL; SSL values are based on DAF=1; m = Concentration may exceed ceiling limit (See User Guide); s = Concentration may exceed Csat (See User Guide) Toxicity and Chemical-specific Information Contaminant Screening Levels Protection of Ground Water SSLs SFO k e IUR k e RfD o k e RfC i k v e o mutagen C sat Resident Soil Industrial Soil Resident Air Industrial Air Tapwater MCL Risk-based SSL MCL-based SSL (mg/kg-day) -1 y (ug/m 3 ) -1 y (mg/kg-day) y (mg/m 3 ) y l GIABS ABS (mg/kg) Analyte CAS No. (mg/kg) key (mg/kg) key (ug/m 3 ) key (ug/m 3 ) key (ug/l) key (ug/l) (mg/kg) key (mg/kg) 4.0E-03 X 2.0E-03 P Pentaerythritol tetranitrate (PETN) E+01 n 1.6E+02 n 3.9E+00 n 5.8E-03 n 1.0E+00 P V 1 3.9E+02 Pentane, n E+01 n 3.4E+02 n 1.0E+02 n 4.4E+02 n 2.1E+02 n 1.0E+00 n Perchlorates 7.0E-04 I 1 ~Ammonium Perchlorate E+00 n 8.2E+01 n 1.4E+00 n n 7.0E-04 I 1 ~Lithium Perchlorate E+00 n 8.2E+01 n 1.4E+00 n n 7.0E-04 I 1 ~Perchlorate and Perchlorate Salts E+00 n 8.2E+01 n 1.4E+00 n 1.5E+01(F) n 7.0E-04 I 1 ~Potassium Perchlorate E+00 n 8.2E+01 n 1.4E+00 n n 7.0E-04 I 1 ~Sodium Perchlorate E+00 n 8.2E+01 n 1.4E+00 n n 2.0E-02 P Perfluorobutane sulfonic acid (PFBS) E+02 n 1.6E+03 n 4.0E+01 n 1.3E-02 n 2.0E-02 P Perfluorobutanesulfonate E+02 n 1.6E+03 n 4.0E+01 n 1.3E-02 n 5.0E-02 I Permethrin E+02 n 4.1E+03 n 1.0E+02 n 2.4E+01 n 2.2E-03 C 6.3E-07 C Phenacetin E+02 c 1.0E+03 c 4.5E+00 c 1.9E+01 c 3.4E+01 c 9.7E-03 c 2.4E-01 O Phenmedipham E+03 n 2.0E+04 n 3.8E+02 n 2.1E+00 n 3.0E-01 I 2.0E-01 C Phenol E+03 n 2.5E+04 n 2.1E+01 n 8.8E+01 n 5.8E+02 n 3.3E-01 n 4.0E-03 I Phenol, 2-(1-methylethoxy)-, methylcarbamate E+01 n 3.3E+02 n 7.8E+00 n 2.5E-03 n 5.0E-04 X Phenothiazine E+00 n 4.1E+01 n 4.3E-01 n 1.4E-03 n 2.0E-04 X V 1 1.3E+02 Phenyl Isothiocyanate E+00 n 2.3E+01 n 2.6E-01 n 1.7E-04 n 6.0E-03 I Phenylenediamine, m E+01 n 4.9E+02 n 1.2E+01 n 3.2E-03 n 1.2E-01 P 4.0E-03 P Phenylenediamine, o E+00 c** 1.9E+01 c* 6.5E-01 c* 1.7E-04 c* 1.0E-03 X Phenylenediamine, p E+00 n 8.2E+01 n 2.0E+00 n 5.4E-04 n 1.9E-03 H Phenylphenol, E+02 c 1.2E+03 c 3.0E+01 c 4.1E-01 c 2.0E-04 H Phorate E+00 n 1.6E+01 n 3.0E-01 n 3.4E-04 n 3.0E-04 I V 1 1.6E+03 Phosgene E-02 n 1.3E-01 n 3.1E-02 n 1.3E-01 n 2.0E-02 I Phosmet E+02 n 1.6E+03 n 3.7E+01 n 8.2E-03 n Phosphates, Inorganic 4.9E+01 P 1 ~Aluminum metaphosphate E+05 nm 5.7E+06 nm 9.7E+04 n n 4.9E+01 P 1 ~Ammonium polyphosphate E+05 nm 5.7E+06 nm 9.7E+04 n n 4.9E+01 P 1 ~Calcium pyrophosphate E+05 nm 5.7E+06 nm 9.7E+04 n n 4.9E+01 P 1 ~Diammonium phosphate E+05 nm 5.7E+06 nm 9.7E+04 n n 4.9E+01 P 1 ~Dicalcium phosphate E+05 nm 5.7E+06 nm 9.7E+04 n n 4.9E+01 P 1 ~Dimagnesium phosphate E+05 nm 5.7E+06 nm 9.7E+04 n n 4.9E+01 P 1 ~Dipotassium phosphate E+05 nm 5.7E+06 nm 9.7E+04 n n 4.9E+01 P 1 ~Disodium phosphate E+05 nm 5.7E+06 nm 9.7E+04 n n 4.9E+01 P 1 ~Monoaluminum phosphate E+05 nm 5.7E+06 nm 9.7E+04 n n 4.9E+01 P 1 ~Monoammonium phosphate E+05 nm 5.7E+06 nm 9.7E+04 n n 4.9E+01 P 1 ~Monocalcium phosphate E+05 nm 5.7E+06 nm 9.7E+04 n n 4.9E+01 P 1 ~Monomagnesium phosphate E+05 nm 5.7E+06 nm 9.7E+04 n n 4.9E+01 P 1 ~Monopotassium phosphate E+05 nm 5.7E+06 nm 9.7E+04 n n 4.9E+01 P 1 ~Monosodium phosphate E+05 nm 5.7E+06 nm 9.7E+04 n n 4.9E+01 P 1 ~Polyphosphoric acid E+05 nm 5.7E+06 nm 9.7E+04 n n 4.9E+01 P 1 ~Potassium tripolyphosphate E+05 nm 5.7E+06 nm 9.7E+04 n n 4.9E+01 P 1 ~Sodium acid pyrophosphate E+05 nm 5.7E+06 nm 9.7E+04 n n 4.9E+01 P 1 ~Sodium aluminum phosphate (acidic) E+05 nm 5.7E+06 nm 9.7E+04 n n 4.9E+01 P 1 ~Sodium aluminum phosphate (anhydrous) E+05 nm 5.7E+06 nm 9.7E+04 n n 4.9E+01 P 1 ~Sodium aluminum phosphate (tetrahydrate) E+05 nm 5.7E+06 nm 9.7E+04 n n 4.9E+01 P 1 ~Sodium hexametaphosphate E+05 nm 5.7E+06 nm 9.7E+04 n n 4.9E+01 P 1 ~Sodium polyphosphate E+05 nm 5.7E+06 nm 9.7E+04 n n 4.9E+01 P 1 ~Sodium trimetaphosphate E+05 nm 5.7E+06 nm 9.7E+04 n n 4.9E+01 P 1 ~Sodium tripolyphosphate E+05 nm 5.7E+06 nm 9.7E+04 n n 4.9E+01 P 1 ~Tetrapotassium phosphate E+05 nm 5.7E+06 nm 9.7E+04 n n 4.9E+01 P 1 ~Tetrasodium pyrophosphate E+05 nm 5.7E+06 nm 9.7E+04 n n 4.9E+01 P 1 ~Trialuminum sodium tetra decahydrogenoctaorthophosphate (dihydrate) E+05 nm 5.7E+06 nm 9.7E+04 n n 4.9E+01 P 1 ~Tricalcium phosphate E+05 nm 5.7E+06 nm 9.7E+04 n n 4.9E+01 P 1 ~Trimagnesium phosphate E+05 nm 5.7E+06 nm 9.7E+04 n n 4.9E+01 P 1 ~Tripotassium phosphate E+05 nm 5.7E+06 nm 9.7E+04 n n 4.9E+01 P 1 ~Trisodium phosphate E+05 nm 5.7E+06 nm 9.7E+04 n n 3.0E-04 I 3.0E-04 I V 1 Phosphine E+00 n 3.5E+01 n 3.1E-02 n 1.3E-01 n 5.7E-02 n n 4.9E+01 P 1.0E-02 I 1 Phosphoric Acid E+05 nm 2.9E+06 nm 1.0E+00 n 4.4E+00 n 9.7E+04 n n 2.0E-05 I V 1 Phosphorus, White E-01 n 2.3E+00 n 4.0E-02 n 1.5E-04 n Phthalates 1.4E-02 I 2.4E-06 C 2.0E-02 I ~Bis(2-ethylhexyl)phthalate E+01 c** 1.6E+02 c* 1.2E+00 c 5.1E+00 c 5.6E+00 c** 6.0E E+00 c** 1.4E E-03 P 2.0E-01 I ~Butyl Benzyl Phthalate E+02 c** 1.2E+03 c* 1.6E+01 c* 2.4E-01 c* 1.0E+00 I ~Butylphthalyl Butylglycolate E+03 n 8.2E+04 n 1.3E+03 n 3.1E+01 n 1.0E-01 I ~Dibutyl Phthalate E+02 n 8.2E+03 n 9.0E+01 n 2.3E-01 n 8.0E-01 I ~Diethyl Phthalate E+03 n 6.6E+04 n 1.5E+03 n 6.1E-01 n 1.0E-01 I V 1 ~Dimethylterephthalate E+02 n 1.2E+04 n 1.9E+02 n 4.9E-02 n 1.0E-02 P ~Octyl Phthalate, di-n E+01 n 8.2E+02 n 2.0E+01 n 5.7E+00 n 1.0E+00 H ~Phthalic Acid, P E+03 n 8.2E+04 n 1.9E+03 n 6.8E-01 n 2.0E+00 I 2.0E-02 C ~Phthalic Anhydride E+04 n 1.6E+05 nm 2.1E+00 n 8.8E+00 n 3.9E+03 n 8.5E-01 n 7.0E-02 I Picloram E+02 n 5.7E+03 n 1.4E+02 n 5.0E E-02 n 1.4E E-04 X Picramic Acid (2-Amino-4,6-dinitrophenol) E-01 n 8.2E+00 n 2.0E-01 n 1.3E-04 n 9.0E-04 X Picric Acid (2,4,6-Trinitrophenol) E+00 n 7.4E+01 n 1.8E+00 n 8.4E-03 n 6.7E-05 O Pirimiphos, Methyl E-01 n 5.5E+00 n 8.1E-02 n 7.7E-05 n 3.0E+01 C 8.6E-03 C 7.0E-06 H Polybrominated Biphenyls E-02 c** 7.7E-02 c** 3.3E-04 c 1.4E-03 c 2.6E-03 c** c** Polychlorinated Biphenyls (PCBs) 7.0E-02 S 2.0E-05 S 7.0E-05 I V ~Aroclor E-01 n 5.1E+00 n 1.4E-01 c 6.1E-01 c 1.4E-01 n 1.3E-02 n Page 8 of 11

135 Regional Screening Level (RSL) Summary Table (TR=1E 06, HQ=0.1) June 2017 Key: I = IRIS; P = PPRTV; D = DWSHA; O = OPP; A = ATSDR; C = Cal EPA; X = APPENDIX PPRTV SCREEN (See FAQ #29); H = HEAST; F = See FAQ; E = see user guide Section 2.3.5; L = see user guide on lead; M = mutagen; S = see user guide Section 5; V = volatile; R = RBA applied (See User Guide for Arsenic notice) ; c = cancer; n = noncancer; * = where: n SL < 100X c SL; ** = where n SL < 10X c SL; SSL values are based on DAF=1; m = Concentration may exceed ceiling limit (See User Guide); s = Concentration may exceed Csat (See User Guide) Toxicity and Chemical-specific Information Contaminant Screening Levels Protection of Ground Water SSLs SFO k e IUR k e RfD o k e RfC i k v e o mutagen C sat Resident Soil Industrial Soil Resident Air Industrial Air Tapwater MCL Risk-based SSL MCL-based SSL (mg/kg-day) -1 y (ug/m 3 ) -1 y (mg/kg-day) y (mg/m 3 ) y l GIABS ABS (mg/kg) Analyte CAS No. (mg/kg) key (mg/kg) key (ug/m 3 ) key (ug/m 3 ) key (ug/l) key (ug/l) (mg/kg) key (mg/kg) 2.0E+00 S 5.7E-04 S V ~Aroclor E-01 c 8.3E-01 c 4.9E-03 c 2.1E-02 c 4.7E-03 c 8.0E-05 c 2.0E+00 S 5.7E-04 S V ~Aroclor E-01 c 7.2E-01 c 4.9E-03 c 2.1E-02 c 4.7E-03 c 8.0E-05 c 2.0E+00 S 5.7E-04 S V ~Aroclor E-01 c 9.5E-01 c 4.9E-03 c 2.1E-02 c 7.8E-03 c 1.2E-03 c 2.0E+00 S 5.7E-04 S V ~Aroclor E-01 c 9.5E-01 c 4.9E-03 c 2.1E-02 c 7.8E-03 c 1.2E-03 c 2.0E+00 S 5.7E-04 S 2.0E-05 I V ~Aroclor E-01 n 9.7E-01 c** 4.9E-03 c 2.1E-02 c 7.8E-03 c** 2.0E-03 c** 2.0E+00 S 5.7E-04 S V ~Aroclor E-01 c 9.9E-01 c 4.9E-03 c 2.1E-02 c 7.8E-03 c 5.5E-03 c 6.0E-04 X V ~Aroclor E+00 n 4.4E+01 n 1.2E+00 n 2.0E-01 n 3.9E+00 E 1.1E-03 E 2.3E-05 E 1.3E-03 E V ~Heptachlorobiphenyl, 2,3,3',4,4',5,5'- (PCB 189) E-01 c** 5.2E-01 c** 2.5E-03 c* 1.1E-02 c* 4.0E-03 c* 2.8E-03 c* 3.9E+00 E 1.1E-03 E 2.3E-05 E 1.3E-03 E V ~Hexachlorobiphenyl, 2,3',4,4',5,5'- (PCB 167) E-01 c** 5.1E-01 c** 2.5E-03 c* 1.1E-02 c* 4.0E-03 c* 1.7E-03 c* 3.9E+00 E 1.1E-03 E 2.3E-05 E 1.3E-03 E V ~Hexachlorobiphenyl, 2,3,3',4,4',5'- (PCB 157) E-01 c** 5.0E-01 c** 2.5E-03 c* 1.1E-02 c* 4.0E-03 c* 1.7E-03 c* 3.9E+00 E 1.1E-03 E 2.3E-05 E 1.3E-03 E V ~Hexachlorobiphenyl, 2,3,3',4,4',5- (PCB 156) E-01 c** 5.0E-01 c** 2.5E-03 c* 1.1E-02 c* 4.0E-03 c* 1.7E-03 c* 3.9E+03 E 1.1E+00 E 2.3E-08 E 1.3E-06 E V ~Hexachlorobiphenyl, 3,3',4,4',5,5'- (PCB 169) E-04 c** 5.1E-04 c** 2.5E-06 c* 1.1E-05 c* 4.0E-06 c* 1.7E-06 c* 3.9E+00 E 1.1E-03 E 2.3E-05 E 1.3E-03 E V ~Pentachlorobiphenyl, 2',3,4,4',5- (PCB 123) E-01 c** 4.9E-01 c** 2.5E-03 c* 1.1E-02 c* 4.0E-03 c* 1.0E-03 c* 3.9E+00 E 1.1E-03 E 2.3E-05 E 1.3E-03 E V ~Pentachlorobiphenyl, 2,3',4,4',5- (PCB 118) E-01 c** 4.9E-01 c** 2.5E-03 c* 1.1E-02 c* 4.0E-03 c* 1.0E-03 c* 3.9E+00 E 1.1E-03 E 2.3E-05 E 1.3E-03 E V ~Pentachlorobiphenyl, 2,3,3',4,4'- (PCB 105) E-01 c** 4.9E-01 c** 2.5E-03 c* 1.1E-02 c* 4.0E-03 c* 1.0E-03 c* 3.9E+00 E 1.1E-03 E 2.3E-05 E 1.3E-03 E V ~Pentachlorobiphenyl, 2,3,4,4',5- (PCB 114) E-01 c** 5.0E-01 c** 2.5E-03 c* 1.1E-02 c* 4.0E-03 c* 1.0E-03 c* 1.3E+04 E 3.8E+00 E 7.0E-09 E 4.0E-07 E V ~Pentachlorobiphenyl, 3,3',4,4',5- (PCB 126) E-05 c** 1.5E-04 c** 7.4E-07 c* 3.2E-06 c* 1.2E-06 c* 3.0E-07 c* 2.0E+00 I 5.7E-04 I V ~Polychlorinated Biphenyls (high risk) E-01 c 9.4E-01 c 4.9E-03 c 2.1E-02 c 5.0E E-01 I 1.0E-04 I V ~Polychlorinated Biphenyls (low risk) E-02 c 1.2E-01 c 4.4E-02 c 5.0E E-03 c 7.8E E-02 I 2.0E-05 I V ~Polychlorinated Biphenyls (lowest risk) E-01 c 6.1E-01 c 5.0E E+01 E 3.8E-03 E 7.0E-06 E 4.0E-04 E ~Tetrachlorobiphenyl, 3,3',4,4'- (PCB 77) E-02 c** 1.6E-01 c** 7.4E-04 c* 3.2E-03 c* 6.0E-03 c** 9.4E-04 c** 3.9E+01 E 1.1E-02 E 2.3E-06 E 1.3E-04 E V ~Tetrachlorobiphenyl, 3,4,4',5- (PCB 81) E-02 c** 4.8E-02 c** 2.5E-04 c* 1.1E-03 c* 4.0E-04 c* 6.2E-05 c* 6.0E-04 I Polymeric Methylene Diphenyl Diisocyanate (PMDI) E+04 n 3.6E+05 nm 6.3E-02 n 2.6E-01 n Polynuclear Aromatic Hydrocarbons (PAHs) 6.0E-02 I V ~Acenaphthene E+02 n 4.5E+03 n 5.3E+01 n 5.5E-01 n 3.0E-01 I V ~Anthracene E+03 n 2.3E+04 n 1.8E+02 n 5.8E+00 n 1.0E-01 E 6.0E-05 E V M ~Benz[a]anthracene E+00 c 2.1E+01 c 1.7E-02 c 2.0E-01 c 3.0E-02 c 1.1E-02 c 1.2E+00 C 1.1E-04 C ~Benzo(j)fluoranthene E-01 c 1.8E+00 c 2.6E-02 c 1.1E-01 c 6.5E-02 c 7.8E-02 c 1.0E+00 I 6.0E-04 I 3.0E-04 I 2.0E-06 I M ~Benzo[a]pyrene E-01 c* 2.1E+00 c* 2.1E-04 n 8.8E-04 n 2.5E-02 c* 2.0E E-02 c* 2.4E E-01 E 6.0E-05 E M ~Benzo[b]fluoranthene E+00 c 2.1E+01 c 1.7E-02 c 2.0E-01 c 2.5E-01 c 3.0E-01 c 1.0E-02 E 6.0E-06 E M ~Benzo[k]fluoranthene E+01 c 2.1E+02 c 1.7E-01 c 2.0E+00 c 2.5E+00 c 2.9E+00 c 8.0E-02 I V ~Chloronaphthalene, Beta E+02 n 6.0E+03 n 7.5E+01 n 3.9E-01 n 1.0E-03 E 6.0E-07 E M ~Chrysene E+02 c 2.1E+03 c 1.7E+00 c 2.0E+01 c 2.5E+01 c 9.0E+00 c 1.0E+00 E 6.0E-04 E M ~Dibenz[a,h]anthracene E-01 c 2.1E+00 c 1.7E-03 c 2.0E-02 c 2.5E-02 c 9.6E-02 c 1.2E+01 C 1.1E-03 C ~Dibenzo(a,e)pyrene E-02 c 1.8E-01 c 2.6E-03 c 1.1E-02 c 6.5E-03 c 8.4E-02 c 2.5E+02 C 7.1E-02 C M ~Dimethylbenz(a)anthracene, 7, E-04 c 8.4E-03 c 1.4E-05 c 1.7E-04 c 1.0E-04 c 9.9E-05 c 4.0E-02 I ~Fluoranthene E+02 n 3.0E+03 n 8.0E+01 n 8.9E+00 n 4.0E-02 I V ~Fluorene E+02 n 3.0E+03 n 2.9E+01 n 5.4E-01 n 1.0E-01 E 6.0E-05 E M ~Indeno[1,2,3-cd]pyrene E+00 c 2.1E+01 c 1.7E-02 c 2.0E-01 c 2.5E-01 c 9.8E-01 c 2.9E-02 P 7.0E-02 A V E+02 ~Methylnaphthalene, E+01 c* 7.3E+01 c* 1.1E+00 c* 6.0E-03 c* 4.0E-03 I V ~Methylnaphthalene, E+01 n 3.0E+02 n 3.6E+00 n 1.9E-02 n 3.4E-05 C 2.0E-02 I 3.0E-03 I V ~Naphthalene E+00 c** 1.7E+01 c** 8.3E-02 c** 3.6E-01 c** 1.7E-01 c** 5.4E-04 c** 1.2E+00 C 1.1E-04 C ~Nitropyrene, E-01 c 1.8E+00 c 2.6E-02 c 1.1E-01 c 1.9E-02 c 3.3E-03 c 3.0E-02 I V ~Pyrene E+02 n 2.3E+03 n 1.2E+01 n 1.3E+00 n 2.0E-02 P Potassium Perfluorobutane Sulfonate E+02 n 1.6E+03 n 4.0E+01 n n 1.5E-01 I 9.0E-03 I Prochloraz E+00 c* 1.5E+01 c* 3.8E-01 c* 1.9E-03 c* 6.0E-03 H V 1 Profluralin E+01 n 7.0E+02 n 2.6E+00 n 1.6E-01 n 1.5E-02 I Prometon E+01 n 1.2E+03 n 2.5E+01 n 1.2E-02 n 4.0E-02 O Prometryn E+02 n 3.3E+03 n 6.0E+01 n 9.0E-02 n 1.3E-02 I Propachlor E+01 n 1.1E+03 n 2.5E+01 n 1.5E-02 n 5.0E-03 I Propanil E+01 n 4.1E+02 n 8.2E+00 n 4.5E-03 n 3.3E-02 O 4.0E-02 O Propargite E+01 c* 7.0E+01 c* 9.2E-01 c* 6.8E-02 c* 2.0E-03 I V 1 1.1E+05 Propargyl Alcohol E+01 n 2.3E+02 n 4.0E+00 n 8.1E-04 n 2.0E-02 I Propazine E+02 n 1.6E+03 n 3.4E+01 n 3.0E-02 n 2.0E-02 I Propham E+02 n 1.6E+03 n 3.5E+01 n 2.2E-02 n 1.0E-01 O Propiconazole E+02 n 8.2E+03 n 1.6E+02 n 5.3E-01 n 8.0E-03 I V 1 3.3E+04 Propionaldehyde E+00 n 3.1E+01 n 8.3E-01 n 3.5E+00 n 1.7E+00 n 3.4E-04 n 1.0E-01 X 1.0E+00 X V 1 2.6E+02 Propyl benzene E+02 ns 2.4E+03 ns 1.0E+02 n 4.4E+02 n 6.6E+01 n 1.2E-01 n 3.0E+00 C V 1 3.5E+02 Propylene E+02 n 9.3E+02 ns 3.1E+02 n 1.3E+03 n 6.3E+02 n 6.0E-01 n 2.0E+01 P Propylene Glycol E+05 nm 1.6E+06 nm 4.0E+04 n 8.1E+00 n 2.7E-04 A Propylene Glycol Dinitrate E+04 n 1.6E+05 nm 2.8E-02 n 1.2E-01 n 7.0E-01 H 2.0E+00 I V 1 1.1E+05 Propylene Glycol Monomethyl Ether E+03 n 3.7E+04 n 2.1E+02 n 8.8E+02 n 3.2E+02 n 6.5E-02 n 2.4E-01 I 3.7E-06 I 3.0E-02 I V 1 7.8E+04 Propylene Oxide E+00 c* 9.7E+00 c* 7.6E-01 c** 3.3E+00 c** 2.7E-01 c* 5.6E-05 c* 7.5E-02 I Propyzamide E+02 n 6.2E+03 n 1.2E+02 n 1.2E-01 n 1.0E-03 I V 1 5.3E+05 Pyridine E+00 n 1.2E+02 n 2.0E+00 n 6.8E-04 n 5.0E-04 I Quinalphos E+00 n 4.1E+01 n 5.1E-01 n 4.3E-03 n 3.0E+00 I Quinoline E-01 c 7.7E-01 c 2.4E-02 c 7.8E-05 c 9.0E-03 I Quizalofop-ethyl E+01 n 7.4E+02 n 1.2E+01 n 1.9E-01 n 3.0E-02 A 1 Refractory Ceramic Fibers E E+06 nm 1.8E+07 nm 3.1E+00 n 1.3E+01 n 3.0E-02 I Resmethrin E+02 n 2.5E+03 n 6.7E+00 n 4.2E+00 n 5.0E-02 H V 1 Ronnel E+02 n 5.8E+03 n 4.1E+01 n 3.7E-01 n 4.0E-03 I Rotenone E+01 n 3.3E+02 n 6.1E+00 n 3.2E+00 n 2.2E-01 C 6.3E-05 C M Safrole E-01 c 1.0E+01 c 1.6E-02 c 1.9E-01 c 9.6E-02 c 5.9E-05 c 5.0E-03 I 1 Selenious Acid E+01 n 5.8E+02 n 1.0E+01 n n 5.0E-03 I 2.0E-02 C 1 Selenium E+01 n 5.8E+02 n 2.1E+00 n 8.8E+00 n 1.0E+01 n 5.0E E-02 n 2.6E E-03 C 2.0E-02 C 1 Selenium Sulfide E+01 n 5.8E+02 n 2.1E+00 n 8.8E+00 n 1.0E+01 n n Page 9 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136 Regional Screening Level (RSL) Summary Table (TR=1E 06, HQ=0.1) June 2017 Key: I = IRIS; P = PPRTV; D = DWSHA; O = OPP; A = ATSDR; C = Cal EPA; X = APPENDIX PPRTV SCREEN (See FAQ #29); H = HEAST; F = See FAQ; E = see user guide Section 2.3.5; L = see user guide on lead; M = mutagen; S = see user guide Section 5; V = volatile; R = RBA applied (See User Guide for Arsenic notice) ; c = cancer; n = noncancer; * = where: n SL < 100X c SL; ** = where n SL < 10X c SL; SSL values are based on DAF=1; m = Concentration may exceed ceiling limit (See User Guide); s = Concentration may exceed Csat (See User Guide) Toxicity and Chemical-specific Information Contaminant Screening Levels Protection of Ground Water SSLs SFO k e IUR k e RfD o k e RfC i k v e o mutagen C sat Resident Soil Industrial Soil Resident Air Industrial Air Tapwater MCL Risk-based SSL MCL-based SSL (mg/kg-day) -1 y (ug/m 3 ) -1 y (mg/kg-day) y (mg/m 3 ) y l GIABS ABS (mg/kg) Analyte CAS No. (mg/kg) key (mg/kg) key (ug/m 3 ) key (ug/m 3 ) key (ug/l) key (ug/l) (mg/kg) key (mg/kg) 1.4E-01 O Sethoxydim E+02 n 1.1E+04 n 1.6E+02 n 1.4E+00 n 3.0E-03 C 1 Silica (crystalline, respirable) E+05 nm 1.8E+06 nm 3.1E-01 n 1.3E+00 n 5.0E-03 I 0.04 Silver E+01 n 5.8E+02 n 9.4E+00 n 8.0E-02 n 1.2E-01 H 5.0E-03 I Simazine E+00 c** 1.9E+01 c* 6.1E-01 c* 4.0E E-04 c* 2.0E E-02 I Sodium Acifluorfen E+01 n 1.1E+03 n 2.6E+01 n 2.1E-01 n 4.0E-03 I 1 Sodium Azide E+01 n 4.7E+02 n 8.0E+00 n n 5.0E-01 C 1.5E-01 C 2.0E-02 C 2.0E-04 C M Sodium Dichromate E-01 c 6.2E+00 c 6.8E-06 c 8.2E-05 c 4.1E-02 c c 2.7E-01 H 3.0E-02 I Sodium Diethyldithiocarbamate E+00 c* 8.5E+00 c 2.9E-01 c 1.8E-04 c 5.0E-02 A 1.3E-02 C 1 Sodium Fluoride E+02 n 5.8E+03 n 1.4E+00 n 5.7E+00 n 1.0E+02 n n 2.0E-05 I Sodium Fluoroacetate E-01 n 1.6E+00 n 4.0E-02 n 8.1E-06 n 1.0E-03 H 1 Sodium Metavanadate E+00 n 1.2E+02 n 2.0E+00 n n 8.0E-04 P 1 Sodium Tungstate E+00 n 9.3E+01 n 1.6E+00 n n 8.0E-04 P 1 Sodium Tungstate Dihydrate E+00 n 9.3E+01 n 1.6E+00 n n 2.4E-02 H 3.0E-02 I Stirofos (Tetrachlorovinphos) E+01 c** 9.6E+01 c* 2.8E+00 c* 8.2E-03 c* 5.0E-01 C 1.5E-01 C 2.0E-02 C 2.0E-04 C M Strontium Chromate E-01 c 6.2E+00 c 6.8E-06 c 8.2E-05 c 4.1E-02 c c 6.0E-01 I 1 Strontium, Stable E+03 n 7.0E+04 n 1.2E+03 n 4.2E+01 n 3.0E-04 I Strychnine E+00 n 2.5E+01 n 5.9E-01 n 6.5E-03 n 2.0E-01 I 1.0E+00 I V 1 8.7E+02 Styrene E+02 n 3.5E+03 ns 1.0E+02 n 4.4E+02 n 1.2E+02 n 1.0E E-01 n 1.1E E-03 P Styrene-Acrylonitrile (SAN) Trimer 1.9E+01 n 2.5E+02 n 4.8E+00 n n 1.0E-03 P 2.0E-03 X Sulfolane E+00 n 8.2E+01 n 2.1E-01 n 8.8E-01 n 2.0E+00 n 4.4E-04 n 8.0E-04 P Sulfonylbis(4-chlorobenzene), 1,1' E+00 n 6.6E+01 n 1.1E+00 n 6.5E-03 n 1.0E-03 C V 1 Sulfur Trioxide E+05 nm 6.0E+05 nm 1.0E-01 n 4.4E-01 n 2.1E-01 n n 1.0E-03 C 1 Sulfuric Acid E+05 nm 6.0E+05 nm 1.0E-01 n 4.4E-01 n 2.5E-02 I 7.1E-06 I 5.0E-02 H Sulfurous acid, 2-chloroethyl 2-[4-(1,1-dimethylethyl)phenoxy]-1-methylethyl ester E+01 c* 9.2E+01 c* 4.0E-01 c 1.7E+00 c 1.3E+00 c* 1.5E-02 c* 3.0E-02 H TCMTB E+02 n 2.5E+03 n 4.8E+01 n 3.3E-01 n 7.0E-02 I Tebuthiuron E+02 n 5.7E+03 n 1.4E+02 n 3.9E-02 n 2.0E-02 H Temephos E+02 n 1.6E+03 n 4.0E+01 n 7.6E+00 n 1.3E-02 I Terbacil E+01 n 1.1E+03 n 2.5E+01 n 7.5E-03 n 2.5E-05 H V 1 3.1E+01 Terbufos E-01 n 2.9E+00 n 2.4E-02 n 5.2E-05 n 1.0E-03 I Terbutryn E+00 n 8.2E+01 n 1.3E+00 n 1.9E-03 n 1.0E-04 I Tetrabromodiphenyl ether, 2,2',4,4'- (BDE-47) E-01 n 8.2E+00 n 2.0E-01 n 5.3E-03 n 3.0E-04 I V 1 Tetrachlorobenzene, 1,2,4, E+00 n 3.5E+01 n 1.7E-01 n 7.9E-04 n 2.6E-02 I 7.4E-06 I 3.0E-02 I V 1 6.8E+02 Tetrachloroethane, 1,1,1, E+00 c 8.8E+00 c 3.8E-01 c 1.7E+00 c 5.7E-01 c* 2.2E-04 c* 2.0E-01 I 5.8E-05 C 2.0E-02 I V 1 1.9E+03 Tetrachloroethane, 1,1,2, E-01 c 2.7E+00 c 4.8E-02 c 2.1E-01 c 7.6E-02 c 3.0E-05 c 2.1E-03 I 2.6E-07 I 6.0E-03 I 4.0E-02 I V 1 1.7E+02 Tetrachloroethylene E+00 n 3.9E+01 n 4.2E+00 n 1.8E+01 n 4.1E+00 n 5.0E E-03 n 2.3E E-02 I Tetrachlorophenol, 2,3,4, E+02 n 2.5E+03 n 2.4E+01 n 1.8E-02 n 2.0E+01 H V 1 Tetrachlorotoluene, p- alpha, alpha, alpha E-02 c 1.6E-01 c 1.3E-03 c 4.5E-06 c 5.0E-04 I Tetraethyl Dithiopyrophosphate E+00 n 4.1E+01 n 7.1E-01 n 5.2E-04 n 8.0E+01 I V 1 2.1E+03 Tetrafluoroethane, 1,1,1, E+04 ns 4.3E+04 ns 8.3E+03 n 3.5E+04 n 1.7E+04 n 9.3E+00 n 2.0E-03 P Tetryl (Trinitrophenylmethylnitramine) E+01 n 2.3E+02 n 3.9E+00 n 3.7E-02 n 2.0E-05 S 1 Thallic Oxide E-01 n 2.3E+00 n 4.0E-02 n n 1.0E-05 X 1 Thallium (I) Nitrate E-02 n 1.2E+00 n 2.0E-02 n n 1.0E-05 X 1 Thallium (Soluble Salts) E-02 n 1.2E+00 n 2.0E-02 n 2.0E E-03 n 1.4E E-05 X V 1 Thallium Acetate E-02 n 1.2E+00 n 2.0E-02 n 4.1E-06 n 2.0E-05 X V 1 Thallium Carbonate E-01 n 2.3E+00 n 4.0E-02 n 8.3E-06 n 1.0E-05 X 1 Thallium Chloride E-02 n 1.2E+00 n 2.0E-02 n n 1.0E-05 S 1 Thallium Selenite E-02 n 1.2E+00 n 2.0E-02 n n 2.0E-05 X 1 Thallium Sulfate E-01 n 2.3E+00 n 4.0E-02 n n 4.3E-02 O Thifensulfuron-methyl E+02 n 3.5E+03 n 8.6E+01 n 2.6E-02 n 1.0E-02 I Thiobencarb E+01 n 8.2E+02 n 1.6E+01 n 5.5E-02 n 7.0E-02 X Thiodiglycol E+02 n 7.9E+03 n 1.4E+02 n 2.8E-02 n 3.0E-04 H Thiofanox E+00 n 2.5E+01 n 5.3E-01 n 1.8E-04 n 1.2E-02 O 2.7E-02 O Thiophanate, Methyl E+01 c** 2.0E+02 c* 6.7E+00 c** 5.7E-03 c** 1.5E-02 O Thiram E+01 n 1.2E+03 n 2.9E+01 n 4.2E-02 n 6.0E-01 H 1 Tin E+03 n 7.0E+04 n 1.2E+03 n 3.0E+02 n 1.0E-04 A V 1 Titanium Tetrachloride E+04 n 6.0E+04 n 1.0E-02 n 4.4E-02 n 2.1E-02 n n 8.0E-02 I 5.0E+00 I V 1 8.2E+02 Toluene E+02 n 4.7E+03 ns 5.2E+02 n 2.2E+03 n 1.1E+02 n 1.0E E-02 n 6.9E E-05 C 8.0E-06 C V 1 Toluene-2,4-diisocyanate E-01 n 2.7E+00 n 8.3E-04 n 3.5E-03 n 1.7E-03 n 2.5E-05 n 1.8E-01 X 2.0E-04 X Toluene-2,5-diamine E+00 n 1.3E+01 c** 4.0E-01 n 1.2E-04 n 1.1E-05 C 8.0E-06 C V 1 1.7E+03 Toluene-2,6-diisocyanate E-01 n 2.2E+00 n 8.3E-04 n 3.5E-03 n 1.7E-03 n 2.6E-05 n 1.6E-02 P 5.1E-05 C Toluidine, o- (Methylaniline, 2-) E+01 c 1.4E+02 c 5.5E-02 c 2.4E-01 c 4.7E+00 c 2.0E-03 c 3.0E-02 P 4.0E-03 X Toluidine, p E+01 c** 7.7E+01 c** 2.5E+00 c** 1.1E-03 c** 3.0E+00 P V 1 3.4E-01 Total Petroleum Hydrocarbons (Aliphatic High) E E+04 ns 3.5E+05 nms 6.0E+03 n 2.4E+02 n 6.0E-01 P V 1 1.4E+02 Total Petroleum Hydrocarbons (Aliphatic Low) E E+01 n 2.2E+02 ns 6.3E+01 n 2.6E+02 n 1.3E+02 n 8.8E-01 n 1.0E-02 X 1.0E-01 P V 1 6.9E+00 Total Petroleum Hydrocarbons (Aliphatic Medium) E E+00 ns 4.4E+01 ns 1.0E+01 n 4.4E+01 n 1.0E+01 n 1.5E-01 n 4.0E-02 P Total Petroleum Hydrocarbons (Aromatic High) E E+02 n 3.3E+03 n 8.0E+01 n 8.9E+00 n 4.0E-03 P 3.0E-02 P V 1 1.8E+03 Total Petroleum Hydrocarbons (Aromatic Low) E E+00 n 4.2E+01 n 3.1E+00 n 1.3E+01 n 3.3E+00 n 1.7E-03 n 4.0E-03 P 3.0E-03 P V 1 Total Petroleum Hydrocarbons (Aromatic Medium) E E+01 n 6.0E+01 n 3.1E-01 n 1.3E+00 n 5.5E-01 n 2.3E-03 n 1.1E+00 I 3.2E-04 I Toxaphene E-01 c 2.1E+00 c 8.8E-03 c 3.8E-02 c 7.1E-02 c 3.0E E-02 c 4.6E E-03 I Tralomethrin E+01 n 6.2E+02 n 1.5E+01 n 5.8E+00 n 3.0E-04 A V 1 Tri-n-butyltin E+00 n 3.5E+01 n 3.7E-01 n 8.2E-03 n 8.0E+01 X Triacetin E+05 nm 6.6E+06 nm 1.6E+05 n 4.5E+01 n 3.4E-02 O Triadimefon E+02 n 2.8E+03 n 6.3E+01 n 5.0E-02 n 7.2E-02 O 2.5E-02 O V 1 Triallate E+00 c* 4.6E+01 c* 4.7E-01 c* 1.0E-03 c* 1.0E-02 I Triasulfuron E+01 n 8.2E+02 n 2.0E+01 n 2.1E-02 n 8.0E-03 I Tribenuron-methyl E+01 n 6.6E+02 n 1.6E+01 n 6.1E-03 n Page 10 of 11

137 Regional Screening Level (RSL) Summary Table (TR=1E 06, HQ=0.1) June 2017 Key: I = IRIS; P = PPRTV; D = DWSHA; O = OPP; A = ATSDR; C = Cal EPA; X = APPENDIX PPRTV SCREEN (See FAQ #29); H = HEAST; F = See FAQ; E = see user guide Section 2.3.5; L = see user guide on lead; M = mutagen; S = see user guide Section 5; V = volatile; R = RBA applied (See User Guide for Arsenic notice) ; c = cancer; n = noncancer; * = where: n SL < 100X c SL; ** = where n SL < 10X c SL; SSL values are based on DAF=1; m = Concentration may exceed ceiling limit (See User Guide); s = Concentration may exceed Csat (See User Guide) Toxicity and Chemical-specific Information Contaminant Screening Levels Protection of Ground Water SSLs SFO k e IUR k e RfD o k e RfC i k v e o mutagen C sat Resident Soil Industrial Soil Resident Air Industrial Air Tapwater MCL Risk-based SSL MCL-based SSL (mg/kg-day) -1 y (ug/m 3 ) -1 y (mg/kg-day) y (mg/m 3 ) y l GIABS ABS (mg/kg) Analyte CAS No. (mg/kg) key (mg/kg) key (ug/m 3 ) key (ug/m 3 ) key (ug/l) key (ug/l) (mg/kg) key (mg/kg) 5.0E-03 I V 1 Tribromobenzene, 1,2, E+01 n 5.8E+02 n 4.5E+00 n 6.4E-03 n 9.0E-03 X Tribromophenol, 2,4, E+01 n 7.4E+02 n 1.2E+01 n 2.2E-02 n 9.0E-03 P 1.0E-02 P Tributyl Phosphate E+01 c** 2.6E+02 c** 5.2E+00 c** 2.5E-02 c** 3.0E-04 P Tributyltin Compounds E E+00 n 2.5E+01 n 6.0E-01 n n 3.0E-04 I Tributyltin Oxide E+00 n 2.5E+01 n 5.7E-01 n 2.9E+01 n 3.0E+01 I 5.0E+00 P V 1 9.1E+02 Trichloro-1,2,2-trifluoroethane, 1,1, E+02 n 2.8E+03 ns 5.2E+02 n 2.2E+03 n 1.0E+03 n 2.6E+00 n 7.0E-02 I 2.0E-02 I Trichloroacetic Acid E+00 c* 3.3E+01 c* 1.1E+00 c* 6.0E E-04 c* 1.2E E-02 H Trichloroaniline HCl, 2,4, E+01 c 7.9E+01 c 2.7E+00 c 7.4E-03 c 7.0E-03 X 3.0E-05 X Trichloroaniline, 2,4, E-01 n 2.5E+00 n 4.0E-02 n 3.6E-04 n 8.0E-04 X V 1 Trichlorobenzene, 1,2, E+00 n 9.3E+01 n 7.0E-01 n 2.1E-03 n 2.9E-02 P 1.0E-02 I 2.0E-03 P V 1 4.0E+02 Trichlorobenzene, 1,2, E+00 n 2.6E+01 n 2.1E-01 n 8.8E-01 n 4.0E-01 n 7.0E E-03 n 2.0E E+00 I 5.0E+00 I V 1 6.4E+02 Trichloroethane, 1,1, E+02 ns 3.6E+03 ns 5.2E+02 n 2.2E+03 n 8.0E+02 n 2.0E E-01 n 7.0E E-02 I 1.6E-05 I 4.0E-03 I 2.0E-04 X V 1 2.2E+03 Trichloroethane, 1,1, E-01 n 6.3E-01 n 2.1E-02 n 8.8E-02 n 4.1E-02 n 5.0E E-05 n 1.6E E-02 I 4.1E-06 I 5.0E-04 I 2.0E-03 I V M 1 6.9E+02 Trichloroethylene E-01 n 1.9E+00 n 2.1E-01 n 8.8E-01 n 2.8E-01 n 5.0E E-04 n 1.8E E-01 I V 1 1.2E+03 Trichlorofluoromethane E+03 ns 3.5E+04 ns 5.2E+02 n 3.3E-01 n 1.0E-01 I Trichlorophenol, 2,4, E+02 n 8.2E+03 n 1.2E+02 n 4.0E-01 n 1.1E-02 I 3.1E-06 I 1.0E-03 P Trichlorophenol, 2,4, E+00 n 8.2E+01 n 9.1E-01 c 4.0E+00 c 1.2E+00 n 1.2E-03 n 1.0E-02 I Trichlorophenoxyacetic Acid, 2,4, E+01 n 8.2E+02 n 1.6E+01 n 6.8E-03 n 8.0E-03 I Trichlorophenoxypropionic acid, -2,4, E+01 n 6.6E+02 n 1.1E+01 n 5.0E E-03 n 2.8E E-03 I V 1 1.3E+03 Trichloropropane, 1,1, E+01 n 5.8E+02 n 8.8E+00 n 3.5E-03 n 3.0E+01 I 4.0E-03 I 3.0E-04 I V M 1 1.4E+03 Trichloropropane, 1,2, E-03 c* 1.1E-01 c* 3.1E-02 n 1.3E-01 n 7.5E-04 c* 3.2E-07 c* 3.0E-03 X 3.0E-04 P V 1 3.1E+02 Trichloropropene, 1,2, E-02 n 3.1E-01 n 3.1E-02 n 1.3E-01 n 6.2E-02 n 3.1E-05 n 2.0E-02 A Tricresyl Phosphate (TCP) E+02 n 1.6E+03 n 1.6E+01 n 1.5E+00 n 3.0E-03 I Tridiphane E+01 n 2.5E+02 n 1.8E+00 n 1.3E-02 n 7.0E-03 I V 1 2.8E+04 Triethylamine E+01 n 4.8E+01 n 7.3E-01 n 3.1E+00 n 1.5E+00 n 4.4E-04 n 2.0E+00 P Triethylene Glycol E+04 n 1.6E+05 nm 4.0E+03 n 8.8E-01 n 2.0E+01 P V 1 4.8E+03 Trifluoroethane, 1,1, E+03 n 6.2E+03 ns 2.1E+03 n 8.8E+03 n 4.2E+03 n 1.3E+01 n 7.7E-03 I 7.5E-03 I V 1 Trifluralin E+01 n 4.2E+02 c** 2.6E+00 c** 8.4E-02 c** 2.0E-02 P 1.0E-02 P Trimethyl Phosphate E+01 c** 1.1E+02 c** 3.9E+00 c** 8.6E-04 c** 1.0E-02 I 6.0E-02 I V 1 2.9E+02 Trimethylbenzene, 1,2, E+01 n 2.0E+02 n 6.3E+00 n 2.6E+01 n 5.5E+00 n 8.1E-03 n 1.0E-02 I 6.0E-02 I V 1 2.2E+02 Trimethylbenzene, 1,2, E+01 n 1.8E+02 n 6.3E+00 n 2.6E+01 n 5.6E+00 n 8.1E-03 n 1.0E-02 I 6.0E-02 I V 1 1.8E+02 Trimethylbenzene, 1,3, E+01 n 1.5E+02 n 6.3E+00 n 2.6E+01 n 6.0E+00 n 8.7E-03 n 1.0E-02 X V 1 3.0E+01 Trimethylpentene, 2,4, E+01 ns 1.2E+03 ns 6.5E+00 n 2.2E-02 n 3.0E-02 I Trinitrobenzene, 1,3, E+02 n 3.2E+03 n 5.9E+01 n 2.1E-01 n 3.0E-02 I 5.0E-04 I Trinitrotoluene, 2,4, E+00 n 5.1E+01 n 9.8E-01 n 5.7E-03 n 2.0E-02 P Triphenylphosphine Oxide E+02 n 1.6E+03 n 3.6E+01 n 1.5E-01 n 2.0E-02 A Tris(1,3-Dichloro-2-propyl) Phosphate E+02 n 1.6E+03 n 3.6E+01 n 8.0E-01 n 1.0E-02 X Tris(1-chloro-2-propyl)phosphate E+01 n 8.2E+02 n 1.9E+01 n 6.5E-02 n 2.3E+00 C 6.6E-04 C V 1 4.7E+02 Tris(2,3-dibromopropyl)phosphate E-01 c 1.3E+00 c 4.3E-03 c 1.9E-02 c 6.8E-03 c 1.3E-04 c 2.0E-02 P 7.0E-03 P Tris(2-chloroethyl)phosphate E+01 c** 1.1E+02 c** 3.8E+00 c** 3.8E-03 c** 3.2E-03 P 1.0E-01 P Tris(2-ethylhexyl)phosphate E+02 c** 7.2E+02 c* 2.4E+01 c** 1.2E+02 c** 8.0E-04 P 1 Tungsten E+00 n 9.3E+01 n 1.6E+00 n 2.4E-01 n 2.0E-04 A 4.0E-05 A 1 Uranium (Soluble Salts) E E+00 n 2.3E+01 n 4.2E-03 n 1.8E-02 n 4.0E-01 n 3.0E E-01 n 1.4E E+00 C 2.9E-04 C M Urethane E-01 c 2.3E+00 c 3.5E-03 c 4.2E-02 c 2.5E-02 c 5.6E-06 c 8.3E-03 P 9.0E-03 I 7.0E-06 P Vanadium Pentoxide E+01 n 8.4E+02 n 3.4E-04 c** 1.5E-03 c** 1.5E+01 n n 5.0E-03 S 1.0E-04 A Vanadium and Compounds E+01 n 5.8E+02 n 1.0E-02 n 4.4E-02 n 8.6E+00 n 8.6E+00 n 1.0E-03 I V 1 Vernolate E+00 n 1.2E+02 n 1.1E+00 n 8.9E-04 n 1.2E-03 O Vinclozolin E+00 n 9.8E+01 n 2.1E+00 n 1.6E-03 n 1.0E+00 H 2.0E-01 I V 1 2.8E+03 Vinyl Acetate E+01 n 3.8E+02 n 2.1E+01 n 8.8E+01 n 4.1E+01 n 8.7E-03 n 3.2E-05 H 3.0E-03 I V 1 2.5E+03 Vinyl Bromide E-01 c** 5.2E-01 c** 8.8E-02 c** 3.8E-01 c** 1.8E-01 c** 5.1E-05 c** 7.2E-01 I 4.4E-06 I 3.0E-03 I 1.0E-01 I V M 1 3.9E+03 Vinyl Chloride E-02 c 1.7E+00 c* 1.7E-01 c* 2.8E+00 c* 1.9E-02 c 2.0E E-06 c 6.9E E-04 I Warfarin E+00 n 2.5E+01 n 5.6E-01 n 5.9E-04 n 2.0E-01 S 1.0E-01 S V 1 3.9E+02 Xylene, P E+01 n 2.4E+02 n 1.0E+01 n 4.4E+01 n 1.9E+01 n 1.9E-02 n 2.0E-01 S 1.0E-01 S V 1 3.9E+02 Xylene, m E+01 n 2.4E+02 n 1.0E+01 n 4.4E+01 n 1.9E+01 n 1.9E-02 n 2.0E-01 S 1.0E-01 S V 1 4.3E+02 Xylene, o E+01 n 2.8E+02 n 1.0E+01 n 4.4E+01 n 1.9E+01 n 1.9E-02 n 2.0E-01 I 1.0E-01 I V 1 2.6E+02 Xylenes E+01 n 2.5E+02 n 1.0E+01 n 4.4E+01 n 1.9E+01 n 1.0E E-02 n 9.9E E-04 I 1 Zinc Phosphide E+00 n 3.5E+01 n 6.0E-01 n n 3.0E-01 I 1 Zinc and Compounds E+03 n 3.5E+04 n 6.0E+02 n 3.7E+01 n 5.0E-02 I Zineb E+02 n 4.1E+03 n 9.9E+01 n 2.9E-01 n 8.0E-05 X 1 Zirconium E-01 n 9.3E+00 n 1.6E-01 n 4.8E-01 n Page 11 of 11