PHASE 2 ENVIRONMENTAL INVESTIGATION BAYWOOD APARTMENTS SONOMA COUNTY APN BAYWOOD DRIVE, PETALUMA, CALIFORNIA

Transcription

1 PHASE 2 ENVIRONMENTAL INVESTIGATION BAYWOOD APARTMENTS SONOMA COUNTY APN BAYWOOD DRIVE, PETALUMA, CALIFORNIA Prepared For The Reliant Group, Inc. 275 Battery Street, Suite 500 San Francisco, California Prepared By Youngdahl Consulting Group, Inc. El Dorado Hills, California Project No. E July 2014

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3 Table of Contents 1.0 INTRODUCTION BACKGROUND GEOLOGY/HYDROGEOLOGY GROUNDWATER SAMPLING AND ANALYTICAL RESULTS FINDINGS AND RECOMMENDATIONS LIMITATIONS REFERENCES... 3 FIGURES Figure 1 Vicinity Map Figure 2 Groundwater Sample s APPENDIX A California Laboratory Services - Groundwater Analytical Report

4 PHASE 2 ENVIRONMENTAL INVESTIGATION BAYWOOD APARTMENTS SONOMA COUNTY APN , BAYWOOD DRIVE, PETALUMA, CA INTRODUCTION The Baywood Apartments site is located at the northwest corner of Baywood Drive and Perry Lane in Petaluma, Sonoma County, California. The property is assigned Sonoma County Assessors Parcel Number (APN) and has never been developed. Title for APN is vested in Baywood Equities LP. A topographic map based upon the USGS 7.5 minute quadrangles is provided as Figure 1- Vicinity Map. USA Dig Alert was contacted and all utilities were identified prior to the start of the subsurface investigation. 2.0 BACKGROUND The 2013 Phase I Environmental Site assessment (ESA) prepared for the Baywood Apartments (Reference 1) concluded that evidence of recognized environmental conditions (RECs) in connection with the subject property were identified in regard to the Metron Super Gas site at 910 Baywood Drive. The most recent groundwater monitoring data for MW-16, located on the subject property, did not indicate sufficient concentrations of chemicals of concern indicative of a potential vapor intrusion condition. The 2013 ESA recommended sampling the groundwater underlying the subject property to evaluate if contaminants are present. Groundwater contamination, resulting from the Metron Super Gas leaking underground storage tank (LUST) site exists in the groundwater underlying the southern portion of the subject property. The groundwater underlying the rest of the subject property has not been evaluated. The Metron Super Gas/Baywood Shell Station (910 Baywood Drive, miles SE) is listed on the LUST, UST, RCRA Non Gen/NLR, FINDS, SWEEPS UST, HAZNET, HIST CORTESE, and EDR US Hist Auto Stat database lists. This site is an active commercial petroleum fueling facility. An unauthorized release was reported in September Dual phase extraction was conducted for 62 days in 2010, which reportedly removed approximately 19,500 pounds of total petroleum hydrocarbons as gasoline (TPHg). Additionally, dual phase extraction and air sparging were conducted for 715 hours in June 2013, which removed approximately 9,000 pounds of TPHg. Since 2002, 17 groundwater monitoring wells have been installed and regularly monitored. Water quality objectives have not been achieved. The contaminant plume exceeds the water quality objectives and methyl tert-butyl ether (MTBE) concentrations are greater than 1,000 µg/l. The petroleum release is limited to the soil and shallow groundwater. The State s recommendation is to continue to conduct dual phase extraction to achieve levels meeting policy guidelines in a timely manner. 3.0 GEOLOGY/HYDROGEOLOGY The site is located in the City of Petaluma, Sonoma County, California and lies at an elevation of approximately 13 feet above mean sea level. The topography of the subject property is relatively flat. The project site is located within the Coast Ranges Geomorphic Province, a relatively geologically young and seismically active region on the western margin of the North American plate. In general, the Coast Ranges are composed of sedimentary bedrock with layers of recent alluvium filling the intervening valleys. The near-surface geology is mapped by the California Geologic Survey as Holocene alluvial fan and fluvial deposits. Groundwater was encountered on the subject property at depths between 3.1 and 6.2 feet according to the Groundwater Monitoring Report for Metron Super Gas (Valero) station at 910 Baywood Drive (September 2013). Groundwater flow across the subject property was generally to the west-southwest with a gradient of feet per foot in September 2013.

5 Phase 2 Environmental Assessment Project No. E Baywood Apts., Page 2 11 July GROUNDWATER SAMPLING AND ANALYTICAL RESULTS On 2 July 2014, TEG Northern California, Inc., drilled four boreholes and collected two groundwater samples in the southern portion of the subject property using a using a truckmounted Strataprobe. A site map with the groundwater sample locations and results is provided as Figure 2. The Strataprobe was used to advance to depths of 20 feet below ground surface (bgs) in GW-1, GW-2, GW-3, and GW-4. The groundwater sample from GW-1 was collected from 10.5 feet bgs and the groundwater sample from GW-2 was collected from 12 feet bgs. Groundwater was not encountered in GW-3 or GW-4. After extraction of the sampling rods, each sampling point was backfilled with neat cement grout. Groundwater samples were analyzed for volatile organic compounds (including TPHg) using EPA Method 8260, for total petroleum hydrocarbons as diesel (TPHd) using EPA Method 8015M, and for fuel oxygenates (including MTBE and TBA) using EPA Method 8240 by California Laboratory Services, a California Department of Health Services certified laboratory. The analytical results are provided in Appendix A. The contaminants, TPHd and TPHg were not detected in the groundwater samples from GW-1 or GW-2. Chloromethane was detected in GW-1 at 1.6 µg/l, which is slightly above the reporting limit of 1.0 µg/l. The fuel oxygenate, MTBE was detected in GW-1 at 4.8 µg/l. No VOCs were detected in GW-2, including fuel oxygenates, at concentrations above their respective reporting limits. The Chloromethane concentration of 1.6 µg/l in GW-2 is well below the Tier 1 ESL of 160 µg/l. The MTBE concentration of 4.8 µg/l in GW-2 is slightly below the Tier 1 ESL of 5.0 µg/l. TABLE 1 Soil Vapor Sample Analytical s for VOCs, TPHG, TPHD, and Oxygenates Depth (feet) TPHG (µg/l) TPGD (µg/l) MTBE (µg/l) Chloromethane (µg/l) GW ND ND GW ND ND ND ND Reporting s SFBRWQCB Tier 1 Screening Levels (ESL) Legend ND Non detect above the reporting limit MCL California Maximum Concentration Level 5.0 FINDINGS AND RECOMMENDATIONS It is our opinion that the groundwater samples collected from GW-1 and GW-2 do not contain contaminants above the SFBRWQCB Tier 1 Screening Levels (ESL). No additional site characterization is recommended. We recommend that this report be submitted to Sonoma County Environmental Management Department for their review and recommendations.

6 Phase 2 Environmental Assessment Project No. E Baywood Apts., Page 3 11 July LIMITATIONS 1. This report has been prepared for the exclusive use of The Reliant Group, Inc. for specific application to the Baywood Apartments site in Petaluma, California. Youngdahl Consulting Group, Inc. has endeavored to comply with generally accepted environmental geology practice common to the local area. Youngdahl Consulting Group, Inc. makes no other warranty, express or implied. 2. As of the present date, the findings of this report are valid for the property studied. With the passage of time changes in the conditions of a property may occur, whether they are due to natural processes or to the works of man on this or adjacent properties. Legislation or the broadening of knowledge may result in changes in applicable standards. Changes outside of our control may cause this report to be invalid, wholly or partially. Therefore, this report should not be relied upon after a period of three years without our review nor should it be used or is it applicable for any properties other than those studied. 3. The analyses and recommendations contained in this report are based on limited windows into the subsurface conditions and data obtained from subsurface exploration. The methods used indicate subsurface conditions only at the specific locations where samples were obtained, only at the time they were obtained, and only to the depths penetrated. Samples cannot be relied on to accurately reflect the strata variations that usually exist between sampling locations. 7.0 REFERENCES 1. California Regional Water Quality Control Board, San Francisco Bay Region, Environmental Screening Levels (ESLs) for Contaminated Soil and Groundwater, prepared by, Interim Final, revised May Advisory Active Soil Gas Investigations, prepared by California Environmental Protection Agency, Department of Toxic Substances Control, Los Angeles Regional Water Quality Control Board, San Francisco Regional Water Quality Control Board, dated April Phase I Environmental Site Assessment, Baywood Apartments, Sonoma County APN , Baywood Drive, Petaluma, California 94952, 30 April 2014, Project No. E

7 FIGURES

8 Approximate Site Location N 1 ½ 0 1 Mile Feet Scale: 1:24,000 BASE MAP REFERENCE: U.S.G.S. 7.5 Minute Topographic Series, Petaluma River Quadrangle, Dated 1954, Revised 1980 Project No.: E July 2014 VICINITY MAP Baywood Drive Apartments - Phase 2 ESA Petaluma, California FIGURE 1

9 Perry Lane No Groundwater Encountered at 20' GW-4 Baywood Drive No Groundwater Encountered at 20' GW-3 Groundwater at 12' TPHG ND TPHD ND MTBE ND Chloromethane ND GW-2 GW-1 MW-12 MW-13 Metron Super Gas Groundwater at 12' TPHG ND TPHD ND MTBE 4.8 (µg/l) Chloromethane 1.6 (µg/l) MW-14 MW-15 MW-11 MW-16 MW-17 N Approximate Scale: 1 = 80' GW-4 MW-17 = Groundwater Sample Locations = Existing Groundwater Well (Reference: Site Plan, Metron Super Gas UST Site, Sierra West Consultants, Inc., Figure 2) BASE MAP REFERENCE: Google Earth, Aerial Data Dated Project No.: E July 2014 GROUNDWATER SAMPLE RESULTS Baywood Drive Apartments - Phase 2 ESA Petaluma, California FIGURE 2

10 APPENDIX A CLS Laboratory Groundwater Sample Report (2 July 2014)

11 3249 Fitzgerald Road Rancho Cordova, CA July 10, 2014 Laurie Israel Project Name: Baywood Apts P2 Enclosed are the results of analyses for samples received by the laboratory on 07/02/14 14:50. Samples were analyzed pursuant to client request utilizing EPA or other ELAP approved methodologies. I certify that the results are in compliance both technically and for completeness. Analytical results are attached to this letter. Please call if we can provide additional assistance. Sincerely, James Liang, Ph.D. Laboratory Director CA DOHS ELAP Accreditation/Registration number 1233

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13 Page 2 of 14 Extractable Petroleum Hydrocarbons by EPA Method 8015M Analyte Reporting Units Dilution Batch Prepared Analyzed Method Notes GW - 2 (CXG ) Water Sampled: 07/02/14 11:00 Received: 07/02/14 14:50 Diesel ND mg/l 1 CX /03/14 07/08/14 EPA 8015M Surrogate: o-terphenyl 112 % GW - 1 (CXG ) Water Sampled: 07/02/14 11:50 Received: 07/02/14 14:50 Diesel ND mg/l 1 CX /03/14 07/08/14 EPA 8015M Surrogate: o-terphenyl 116 %

14 Page 3 of 14 TPH-Gasoline by GC/MS Analyte Reporting Units Dilution Batch Prepared Analyzed Method Notes GW - 2 (CXG ) Water Sampled: 07/02/14 11:00 Received: 07/02/14 14:50 Gasoline ND 50 µg/l 1 CX /03/14 07/03/14 EPA 8260M Surrogate: Toluene-d8 106 % GW - 1 (CXG ) Water Sampled: 07/02/14 11:50 Received: 07/02/14 14:50 Gasoline ND 50 µg/l 1 CX /03/14 07/03/14 EPA 8260M Surrogate: Toluene-d8 130 %

15 Page 4 of 14 Volatile Organic Compounds by EPA Method 8260B Analyte Reporting Units Dilution Batch Prepared Analyzed Method Notes GW - 2 (CXG ) Water Sampled: 07/02/14 11:00 Received: 07/02/14 14:50 Acetone ND 10 µg/l 1 CX /03/14 Benzene ND 0.50 Bromobenzene ND 0.50 Bromochloromethane ND 0.50 Bromodichloromethane ND 0.50 Bromoform ND 0.50 Bromomethane ND Butanone ND 10 n-butylbenzene ND 0.50 sec-butylbenzene ND 0.50 tert-butylbenzene ND 0.50 Carbon tetrachloride ND 0.50 Chlorobenzene ND 0.50 Chloroethane ND 0.50 Chloroform ND 0.50 Chloromethane ND 1.0 o-chlorotoluene ND 0.50 p-chlorotoluene ND 0.50 Dibromochloromethane ND ,2-Dibromo-3-chloropropane ND 1.0 1,2-Dibromoethane (EDB) ND 0.50 Dibromomethane ND ,2-Dichlorobenzene ND ,3-Dichlorobenzene ND ,4-Dichlorobenzene ND 0.50 Dichlorodifluoromethane (Freon 12) ND 1.0 1,1-Dichloroethane ND ,2-Dichloroethane ND ,1-Dichloroethene ND 0.50 cis-1,2-dichloroethene ND 0.50 trans-1,2-dichloroethene ND /03/14 EPA 8260B

16 Page 5 of 14 Volatile Organic Compounds by EPA Method 8260B Analyte Reporting Units Dilution Batch Prepared Analyzed Method Notes GW - 2 (CXG ) Water Sampled: 07/02/14 11:00 Received: 07/02/14 14:50 1,2-Dichloropropane ND 0.50 µg/l 1 CX ,3-Dichloropropane ND ,2-Dichloropropane ND ,1-Dichloropropene ND 0.50 cis-1,3-dichloropropene ND 0.50 trans-1,3-dichloropropene ND 0.50 Ethylbenzene ND ,1,2-Trichloro-1,2,2-trifluoroethane ND 0.50 (Freon 113) Hexachlorobutadiene ND Hexanone ND 10 Isopropylbenzene ND 0.50 p-isopropyltoluene ND 0.50 Methylene chloride ND Methyl-2-pentanone ND 10 Methyl tert-butyl ether ND 0.50 Naphthalene ND 0.50 n-propylbenzene ND 0.50 Styrene ND ,1,1,2-Tetrachloroethane ND ,1,2,2-Tetrachloroethane ND 0.50 Tetrachloroethene ND 0.50 Toluene ND ,2,3-Trichlorobenzene ND ,2,4-Trichlorobenzene ND ,1,1-Trichloroethane ND ,1,2-Trichloroethane ND 0.50 Trichloroethene ND 0.50 Trichlorofluoromethane ND ,2,3-Trichloropropane ND ,2,4-Trimethylbenzene ND /03/14 EPA 8260B

17 Page 6 of 14 Volatile Organic Compounds by EPA Method 8260B Analyte Reporting Units Dilution Batch Prepared Analyzed Method Notes GW - 2 (CXG ) Water Sampled: 07/02/14 11:00 Received: 07/02/14 14:50 1,3,5-Trimethylbenzene ND 0.50 µg/l 1 CX04633 Vinyl chloride ND 1.0 Xylenes (total) ND 1.0 m,p-xylene ND 0.50 o-xylene ND 0.50 Di-isopropyl ether ND 0.50 Ethyl tert-butyl ether ND 0.50 tert-amyl methyl ether ND 0.50 tert-butyl alcohol ND /03/14 EPA 8260B Surrogate: 1,2-Dichloroethane-d4 118 % Surrogate: Toluene-d8 90 % Surrogate: 4-Bromofluorobenzene 120 % GW - 1 (CXG ) Water Sampled: 07/02/14 11:50 Received: 07/02/14 14:50 Acetone ND 10 µg/l 1 CX /03/14 Benzene ND 0.50 Bromobenzene ND 0.50 Bromochloromethane ND 0.50 Bromodichloromethane ND 0.50 Bromoform ND 0.50 Bromomethane ND Butanone ND 10 n-butylbenzene ND 0.50 sec-butylbenzene ND 0.50 tert-butylbenzene ND 0.50 Carbon tetrachloride ND 0.50 Chlorobenzene ND 0.50 Chloroethane ND 0.50 Chloroform ND /03/14 Chloromethane EPA 8260B

18 Page 7 of 14 Volatile Organic Compounds by EPA Method 8260B Analyte Reporting Units Dilution Batch Prepared Analyzed Method Notes GW - 1 (CXG ) Water Sampled: 07/02/14 11:50 Received: 07/02/14 14:50 o-chlorotoluene ND 0.50 µg/l 1 CX04633 p-chlorotoluene ND 0.50 Dibromochloromethane ND ,2-Dibromo-3-chloropropane ND 1.0 1,2-Dibromoethane (EDB) ND 0.50 Dibromomethane ND ,2-Dichlorobenzene ND ,3-Dichlorobenzene ND ,4-Dichlorobenzene ND 0.50 Dichlorodifluoromethane (Freon 12) ND 1.0 1,1-Dichloroethane ND ,2-Dichloroethane ND ,1-Dichloroethene ND 0.50 cis-1,2-dichloroethene ND 0.50 trans-1,2-dichloroethene ND ,2-Dichloropropane ND ,3-Dichloropropane ND ,2-Dichloropropane ND ,1-Dichloropropene ND 0.50 cis-1,3-dichloropropene ND 0.50 trans-1,3-dichloropropene ND 0.50 Ethylbenzene ND ,1,2-Trichloro-1,2,2-trifluoroethane ND 0.50 (Freon 113) Hexachlorobutadiene ND Hexanone ND 10 Isopropylbenzene ND 0.50 p-isopropyltoluene ND 0.50 Methylene chloride ND Methyl-2-pentanone ND 10 07/03/14 Methyl tert-butyl ether EPA 8260B

19 Page 8 of 14 Volatile Organic Compounds by EPA Method 8260B Analyte Reporting Units Dilution Batch Prepared Analyzed Method Notes GW - 1 (CXG ) Water Sampled: 07/02/14 11:50 Received: 07/02/14 14:50 Naphthalene ND 0.50 µg/l 1 CX04633 n-propylbenzene ND 0.50 Styrene ND ,1,1,2-Tetrachloroethane ND ,1,2,2-Tetrachloroethane ND 0.50 Tetrachloroethene ND 0.50 Toluene ND ,2,3-Trichlorobenzene ND ,2,4-Trichlorobenzene ND ,1,1-Trichloroethane ND ,1,2-Trichloroethane ND 0.50 Trichloroethene ND 0.50 Trichlorofluoromethane ND ,2,3-Trichloropropane ND ,2,4-Trimethylbenzene ND ,3,5-Trimethylbenzene ND 0.50 Vinyl chloride ND 1.0 Xylenes (total) ND 1.0 m,p-xylene ND 0.50 o-xylene ND 0.50 Di-isopropyl ether ND 0.50 Ethyl tert-butyl ether ND 0.50 tert-amyl methyl ether ND 0.50 tert-butyl alcohol ND /03/14 EPA 8260B Surrogate: 1,2-Dichloroethane-d4 120 % Surrogate: Toluene-d8 89 % Surrogate: 4-Bromofluorobenzene 109 %

20 Page 9 of 14 Extractable Petroleum Hydrocarbons by EPA Method 8015M - Quality Control Analyte Reporting Units Spike Level Source %REC %REC s RPD RPD Notes Batch CX EPA 3510B GCNV Blank (CX04560-BLK1) Prepared: 07/03/14 Analyzed: 07/08/14 Diesel ND Motor Oil ND Hydraulic Oil ND Mineral Oil ND Kerosene ND Surrogate: o-terphenyl LCS (CX04560-BS1) Prepared: 07/03/14 Analyzed: 07/08/14 Diesel mg/l mg/l Surrogate: o-terphenyl LCS Dup (CX04560-BSD1) Prepared: 07/03/14 Analyzed: 07/08/14 Diesel mg/l Surrogate: o-terphenyl Matrix Spike (CX04560-MS1) Source: CXG Prepared: 07/03/14 Analyzed: 07/08/14 Diesel mg/l 2.50 ND Surrogate: o-terphenyl Matrix Spike Dup (CX04560-MSD1) Source: CXG Prepared: 07/03/14 Analyzed: 07/08/14 Diesel mg/l 2.50 ND Surrogate: o-terphenyl

21 Page 10 of 14 TPH-Gasoline by GC/MS - Quality Control Analyte Reporting Units Spike Level Source %REC %REC s RPD RPD Notes Batch CX EPA 5030 Water MS Blank (CX04633-BLK1) Prepared & Analyzed: 07/03/14 Gasoline ND 50 Surrogate: Toluene-d LCS (CX04633-BS1) Prepared & Analyzed: 07/03/14 Gasoline µg/l µg/l Surrogate: Toluene-d LCS Dup (CX04633-BSD1) Prepared & Analyzed: 07/03/14 Gasoline µg/l Surrogate: Toluene-d

22 Page 11 of 14 Volatile Organic Compounds by EPA Method 8260B - Quality Control Analyte Reporting Units Spike Level Source %REC %REC s RPD RPD Notes Batch CX EPA 5030 Water MS Blank (CX04633-BLK1) Prepared & Analyzed: 07/03/14 Acetone ND 10 Benzene ND 0.50 Bromobenzene ND 0.50 Bromochloromethane ND 0.50 Bromodichloromethane ND 0.50 Bromoform ND 0.50 Bromomethane ND Butanone ND 10 n-butylbenzene ND 0.50 sec-butylbenzene ND 0.50 tert-butylbenzene ND 0.50 Carbon tetrachloride ND 0.50 Chlorobenzene ND 0.50 Chloroethane ND 0.50 Chloroform ND 0.50 Chloromethane ND 1.0 o-chlorotoluene ND 0.50 p-chlorotoluene ND 0.50 Dibromochloromethane ND ,2-Dibromo-3-chloropropane ND 1.0 1,2-Dibromoethane (EDB) ND 0.50 Dibromomethane ND ,2-Dichlorobenzene ND ,3-Dichlorobenzene ND ,4-Dichlorobenzene ND 0.50 Dichlorodifluoromethane (Freon 12) ND 1.0 1,1-Dichloroethane ND ,2-Dichloroethane ND ,1-Dichloroethene ND 0.50 cis-1,2-dichloroethene ND 0.50 trans-1,2-dichloroethene ND 0.50 µg/l

23 Page 12 of 14 Volatile Organic Compounds by EPA Method 8260B - Quality Control Analyte Reporting Units Spike Level Source %REC %REC s RPD RPD Notes Batch CX EPA 5030 Water MS Blank (CX04633-BLK1) Prepared & Analyzed: 07/03/14 1,2-Dichloropropane ND ,3-Dichloropropane ND ,2-Dichloropropane ND ,1-Dichloropropene ND 0.50 cis-1,3-dichloropropene ND 0.50 trans-1,3-dichloropropene ND 0.50 Ethylbenzene ND ,1,2-Trichloro-1,2,2-trifluoroethane (Freon ND ) Hexachlorobutadiene ND Hexanone ND 10 Isopropylbenzene ND 0.50 p-isopropyltoluene ND 0.50 Methylene chloride ND Methyl-2-pentanone ND 10 Methyl tert-butyl ether ND 0.50 Naphthalene ND 0.50 n-propylbenzene ND 0.50 Styrene ND ,1,1,2-Tetrachloroethane ND ,1,2,2-Tetrachloroethane ND 0.50 Tetrachloroethene ND 0.50 Toluene ND ,2,3-Trichlorobenzene ND ,2,4-Trichlorobenzene ND ,1,1-Trichloroethane ND ,1,2-Trichloroethane ND 0.50 Trichloroethene ND 0.50 Trichlorofluoromethane ND ,2,3-Trichloropropane ND ,2,4-Trimethylbenzene ND 0.50 µg/l

24 Page 13 of 14 Volatile Organic Compounds by EPA Method 8260B - Quality Control Analyte Reporting Units Spike Level Source %REC %REC s RPD RPD Notes Batch CX EPA 5030 Water MS Blank (CX04633-BLK1) Prepared & Analyzed: 07/03/14 1,3,5-Trimethylbenzene ND 0.50 Vinyl chloride ND 1.0 Xylenes (total) ND 1.0 Surrogate: 1,2-Dichloroethane-d Surrogate: Toluene-d Surrogate: 4-Bromofluorobenzene LCS (CX04633-BS1) Prepared & Analyzed: 07/03/14 Benzene µg/l µg/l Chlorobenzene ,1-Dichloroethene Toluene Trichloroethene Surrogate: 1,2-Dichloroethane-d Surrogate: Toluene-d Surrogate: 4-Bromofluorobenzene LCS Dup (CX04633-BSD1) Prepared & Analyzed: 07/03/14 Benzene µg/l Chlorobenzene ,1-Dichloroethene Toluene Trichloroethene Surrogate: 1,2-Dichloroethane-d Surrogate: Toluene-d Surrogate: 4-Bromofluorobenzene

25 Page 14 of 14 Notes and Definitions DET ND NR dry RPD Analyte DETECTED Analyte NOT DETECTED at or above the reporting limit (or method detection limit when specified) Not Reported Sample results reported on a dry weight basis Relative Percent Difference