June 2017 Port of Stockton Maintenance Dredging Sediment Characterization. Notice of Intent. Prepared for the Port of Stockton

Transcription

1 June 2017 Port of Stockton Maintenance Dredging Sediment Characterization Notice of Intent Prepared for the Port of Stockton

2 June 2017 Port of Stockton Maintenance Dredging Sediment Characterization Notice of Intent Prepared for Port of Stockton 2201 West Washington Street Stockton, California Prepared by Anchor QEA, LLC 130 Battery Street, Suite 400 San Francisco, California Project Number:

3 TABLE OF CONTENTS 1 Introduction Dredge Project Area Description Agency Permitting and Review Dredge Plan Dredging Method Overview Dredging Rates Best Management Practices Method of Transporting Dredged Material Dredge Material Placement Sites Pre-dredge Sampling Summary Sediment Core Collection Sediment Core Sample Processing Background Soil Sample Collection and Processing Pre-dredge Sampling Results Upland Disposal Assessment Metals Polycyclic Aromatic Hydrocarbons Total Petroleum Hydrocarbons Antidegradation Assessment Metals Polycyclic Aromatic Hydrocarbons Quality Assurance/Quality Control Conclusion References FIGURES Figure 1 Figure 2a Figure 2b Figure 3a Figure 3b Port of Stockton Docks and Dredge Material Placement Sites West Complex Actual Coring Locations East Complex Actual Coring Locations Roberts Island Dredge Material Placement Site Sample Locations Rough and Ready Island Dredge Material Placement Site Sample Locations Notice of Intent i June 2017

4 TABLES Table 1 Table 2 Table 3 Table 4 Table 5 Table 6 Table 7 Core Collection Summary Dredge Management Placement Site Soil Collection Summary Sample Inventory Sediment Results Upland Soil Results DI-WET Results Surface Water Result APPENDICES Appendix A Appendix B Field Forms Laboratory Data Reports Notice of Intent ii June 2017

5 ABBREVIATIONS ALS BMP CDFW cy DGPS DI-WET DMPS DO DU DWSC ESA GO LCS MLLW MS/MSD NMFS NOA NOI PAH PEL Port QA/QC R/V RI RRI RWQCB SAP TPH USACE USFWS ALS Environmental best management practice California Department of Fish and Wildlife cubic yard differential global positioning system Deionized Water Waste Extraction Test dredge material placement site dissolved oxygen dredge unit Deep Water Ship Channel Endangered Species Act Waste Discharge General Order No. R laboratory control sample mean lower low water matrix spike and matrix spike duplicate National Marine Fisheries Service Notice of Applicability Notice of Intent polycyclic aromatic hydrocarbon Probable Effects Level Port of Stockton quality assurance and quality control research vessel Roberts Island Rough and Ready Island Central Valley Regional Water Quality Control Board Sampling and Analysis Plan total petroleum hydrocarbons U.S. Army Corps of Engineers U.S. Fish and Wildlife Service Notice of Intent iii June 2017

6 1 Introduction The Port of Stockton (Port) conducted pre-dredge sediment characterization at 19 berths along the San Joaquin River in the City of Stockton, California (Figure 1). Due to high sedimentation rates in the San Joaquin River, the Port typically conducts maintenance dredging of its berths on an annual basis. To streamline regulatory agency reviews and minimize permitting-related construction delays, the Port is requesting approval from regulatory and resource agencies, including the Central Valley Regional Water Quality Control Board (RWQCB), to conduct maintenance dredging over a 5-year period to maintain adequate navigational and operational depths for commercial vessel traffic. Docks 2 through 13 operate along the waterfront of the Port s East Complex, and Docks 14 through 20 operate along the neighboring Rough and Ready Island (West Complex; RRI). The RWQCB has issued the Waste Discharge General Order No. R (GO; RWQCB 2009) to conduct maintenance dredging to authorized depths, including placement of dredge sediments at dredge material placement sites (DMPSs). Anchor QEA, LLC, has prepared this Notice of Intent (NOI) in accordance with the GO for the Port East and West complexes. The Port is requesting a Notice of Applicability (NOA) for the 5-year maintenance dredging project. 1.1 Dredge Project Area Description The proposed dredge plan includes maintenance dredging at Docks 2 through 20 (Figure 1). Eight dredge units (DUs) were sampled and characterized (Table 1; Figures 2a and 2b). The DU for Docks 12 and 13 will be dredged to a depth of -40 feet mean lower low water (MLLW), plus 2 feet of allowable overdepth. All other DUs will be dredged to a depth of -35 feet MLLW, plus 2 feet of allowable overdepth. Dredged material volume estimates were developed based on recent bathymetric condition surveys conducted by etrac, Inc., on July 28, 2016, August 24, 2016, and January 19, The total volume of existing sediment requiring maintenance dredging (including overdepth) at the Port docks is approximately 75,000 cubic yards (cy). Table 1 summarizes the total proposed maintenance dredging volumes for each DU. Proposed dredged material from all docks will be evaluated for disposal at Rough and Ready Island (RRI) and Roberts Island (RI) DMPSs. The Port is requesting approval from the RWQCB to conduct maintenance dredging at its docks over a 5-year period during which additional sediment will deposit within the dredge prism; however, newly deposited sediment would be anticipated to be similar in nature to the sediment that has currently settled at the docks. Therefore, the sediment characterization results collected this spring would be representative of future sediment deposition over a 5-year period. Notice of Intent 1 June 2017

7 1.2 Agency Permitting and Review The Port s maintenance dredging efforts require permits from the U.S. Army Corps of Engineers (USACE), including Endangered Species Act (ESA) consultations with the National Marine Fisheries Service (NMFS), the U.S. Fish and Wildlife Service (USFWS), and the California Department of Fish and Wildlife (CDFW). Permits have historically been issued on an episodic and annual basis. Similarly, the Port has historically received approval from the RWQCB to dredge and place material at its upland placement sites on an episodic and annual basis. To minimize efforts on the part of the Port and agencies, and to increase the predictability for dredging timing each year, the Port is in the process of pursuing 5-year programmatic approvals for maintenance dredging of its docks from the USACE (Section 10 Permit). Five-year programmatic permits have already been obtained from CDFW (Section 1600 Permit) and the RWQCB (401 Water Quality Certification). Notice of Intent 2 June 2017

8 2 Dredge Plan The Port owns and operates all docks along the East and West complexes. In the East Complex, Docks 2 through 11 are maintained at a nominal depth of -35 feet MLLW, and Docks 12 and 13 are maintained at a nominal depth of -40 feet MLLW, both with an additional 2 feet of allowable overdepth. The additional 5 feet of depth at Docks 12 and 13 is associated with a sediment trap intended to capture sediment flowing down the San Joaquin River to minimize sedimentation in the Stockton Deep Water Ship Channel (DWSC). The West Complex is maintained at a nominal depth of -35 feet MLLW at Docks 14 through 20, with 2 feet of allowable overdepth. The Port has historically conducted maintenance dredging of its berths between August 1 and November 30, but is in the process of obtaining an expanded work window beginning July 1. This work window would only become valid upon issuance of required federal and state permits noting its acceptability. Dredging durations vary annually, but have typically been in the range of 30 to 60 days. 2.1 Dredging Method Overview A hydraulic suction cutterhead dredge will be the primary dredging methodology employed by the Port at its docks, with up to 22,000 feet of plastic pipeline transporting dredged material to the Portoperated RI and/or RRI DMPSs. In 2014, however, the Port received authorization to use a mechanical dredge for maintenance dredging at Docks 16 through 20 due to large debris that was causing hydraulic dredge equipment failures. The Port intends to conduct hydraulic dredging for maintaining its docks; however, both types of dredging techniques (hydraulic and maintenance) were included in the 5-year permit applications to allow for flexibility in contractor procurement processes. 2.2 Dredging Rates Dredging rates vary depending on the type of material being dredged and downtime where no dredging occurs to allow for repositioning of equipment and switching of crew, but production rates of 300 to 600 cy per operational hour are typical. Dredging is anticipated to occur 24 hours per day, 7 days per week. 2.3 Best Management Practices Dredging will follow the applicable best management practices (BMPs) as outlined in the regulatory permit applications for the 5-year maintenance dredging program, including the following: During construction, the contractor will be required to implement the water quality monitoring program, which involves twice daily monitoring at the 300-foot mixing zone from dredging operations for compliance with turbidity, dissolved oxygen (DO), temperature, and ph requirements. Notice of Intent 3 June 2017

9 Dredging will be conducted between July 1 and November 30 to avoid the early summer months when temperatures are normally high and DO levels are normally low, thereby minimizing potential impacts to water quality. The Port s operation of aeration devices at Dock 13 or Dock 20 may help to increase the DO levels during dredging operations. If needed to maintain acceptable DO levels, the Port could operate its aeration facilities during dredging. To verify that contaminants are not accidently introduced into the waterway, the Port would implement standard erosion and sediment controls and spill prevention and response measures in and around the proposed project area. The contractor responsible for operating the dredging equipment would be responsible for ensuring that such measures are adhered to. Floating debris will be removed from the water and disposed of properly. No dredging work will be conducted from land-based equipment. All dredged material will be handled and transported such that it does not re-enter surface waters outside of the protected immediate work area. Dredging at each project location will be limited to the approved project depth plus overdepth. Hydraulic dredging measures, as follows: The cutterhead rotation speed will be reduced as needed to reduce the potential for side-casting the excavated sediment away from the suction entrance and resuspending sediment. The swing speed will be reduced as needed to ensure that the dredge head does not move through the cut faster than it can hydraulically pump the sediment. Reducing swing speed reduces the volume of resuspended sediment. The goal is to swing the dredge head at a speed that allows as much of the disturbed sediment as possible to be removed with the hydraulic flow. Typical swing speeds range from 5 to 30 feet per minute. Bank undercutting will be eliminated, and sediment will be removed in maximum lifts equal to 80% or less of the cutterhead diameter. The hydraulic dredge will operate on the bottom of the channel, and the velocity of water moving toward the dredge cutterhead will be less than 0.1 feet per second within 9 feet of the suction pipe opening. 2.4 Method of Transporting Dredged Material The liquefied dredged material, typically 10% to 20% solid, will be hydraulically transported through a continuous pipeline to the specified DMPS. The actual pipeline route will be determined by the contractor. Generally, the pipeline is placed close to the shoreline to avoid conflicts with navigation. At channel crossings, the pipeline will be submerged to minimize impact to navigation. Navigational Notice of Intent 4 June 2017

10 aids for the pipeline and dredge plant will be in accordance with U.S. Coast Guard and Department of Army regulations. 2.5 Dredge Material Placement Sites Two DMPS are proposed for this project. Annual events have estimated volumes of under 100,000 cy of dredged slurry, which will be distributed to one or both Port-owned DMPSs. Pooling will be monitored to make sure direct discharges to the water do not occur. Rough and Ready Island. RRI is located adjacent to Docks 14 through 20. The DMPS location is in the southeast corner of the island. Roberts Island. RI is located west of the dredge area. The DMPS location is in the northeast portion of RI, along the man-made portion of the Stockton River. Notice of Intent 5 June 2017

11 3 Pre-dredge Sampling Summary Sampling was conducted by Anchor QEA in accordance with the approved 2017 Sampling and Analysis Plan (SAP; Anchor QEA 2017) between March 20 and 24, The SAP provides the sample design, target sampling locations, procedures for sample collection and processing, and data reporting requirements. The SAP complies with the requirements established in GO No. R and was approved by the RWQCB prior to sample collection. 3.1 Sediment Core Collection Eight DUs were established to characterize sediment spatially across the East and West complexes. One core was collected for each 5,000 cy of sediment. Table 1 provides core station coordinates, collection dates, mudline depths, and docks included in each of the DUs. Appendix A provides field logs. Sampling was conducted aboard the research vessel (R/V) Leviathan, operated by subcontractor Leviathan Environmental Services, LLC, using an electrically-powered vibracore. Core tubes consisted of polyethylene liners inside a 4-inch outer diameter aluminum core barrel with a stainless-steel catcher to retain the sediment. A hand-held differential global positioning system (DGPS) unit was used for positioning. Water depth was measured using a lead line or hand-held fathometer from the bow of the R/V Leviathan. The mudline elevation relative to the MLLW datum was determined by adding the predicted water level elevation for Stockton, California (California Department of Water Resources Stockton Deep Water Channel Station [SKT] on Rough and Ready Island) to the measured depth. Sampling consisted of collecting sediment cores at two stations within DUs 1, 3, 4, 7, and 8, and three stations within DUs 2, 5, and 6, for a total of 19 stations. Sediment cores were collected at each location to project depth, plus 2 feet of overdepth, plus a new horizon layer (1 foot of sediment that represents the post-dredge surface). Per the SAP, sediment cores were collected from within a 50-foot radius of the proposed targets, except for three locations (DU3-2, DU4-2, and DU5-1) where the project manager selected an alternate location within the same DU. 3.2 Sediment Core Sample Processing Sediment core samples were processed onboard the sampling vessel. The physical characteristics of each core were noted on a sediment core processing form (Appendix A). Sediment from each core within a DU was collected to the project maintenance dredge depth plus 2 feet of overdepth, and was homogenized to a uniform consistency in a stainless-steel bowl using a drill with mixer attachment. A 1-foot new horizon layer sample was collected from each individual core within a DU and homogenized in a stainless-steel bowl using a drill with mixer attachment. Sediment was then spooned into laboratory-supplied jars for analyses, as summarized in Table 3. The new horizon layer composite samples were archived for additional chemical and biological testing. Notice of Intent 6 June 2017

12 3.3 Background Soil Sample Collection and Processing Soil samples for background characterization were collected from representative sample locations within each DMPS area using a hand auger (Figures 3a and 3b). Navigation and positioning were accomplished using a hand-held DGPS device with an accuracy of plus or minus 10 feet. Three composite samples were generated from nine sample locations evenly distributed throughout the DMPS area. The centroid of the sample locations that comprise each composite sample is provided in Table 2 and Figures 3a and 3b. Appendix A provides field logs. Notice of Intent 7 June 2017

13 4 Pre-dredge Sampling Results Physical and chemical analyses were performed on composite sediment and soil samples as summarized in Table 3. Testing included metals (bulk and Deionized Water Waste Extraction Test [DI-WET]), polycyclic aromatic hydrocarbons (PAHs), total petroleum hydrocarbons (TPH), grain size, total organic carbon, bulk density, moisture content, ph, cation exchange capacity, ammonia, and sulfide. All testing was conducted at Eurofins Calscience laboratory in Garden Grove, California, except for DI-WET reanalysis, which was tested at ALS Environmental (ALS) in Kelso, Washington (described in Section 4.1.1). Sample results are provided in Tables 4 through 7, and laboratory data reports are provided in Appendix B. Dredge material and upland soil were analyzed to determine the following: 1. Applicability of representative dredge sediment for upland disposal at the two DMPSs. 2. Antidegradation assessment of the new horizon samples. 4.1 Upland Disposal Assessment Sediment results from dredge prism composite samples (Table 4) were screened against the USACE Applicability of Sediments for Upland Disposal Criteria in General Order R (RWQCB 2004) and upland soil results from the DMPS samples (Table 5). An insufficient number of data points were available to calculate representative background threshold values for the DMPSs, so dredge material results were compared to concentration ranges in the upland samples. Results indicate that there are a few screening level exceedances, but most results are consistent with DMPS background concentrations and are unlikely to negatively impact upland soil quality at the DMPSs Metals Bulk sediment metals were generally below USACE criteria (RWQCB 2004) except for copper in two samples (DU2-COMP and DU4-COMP) and zinc in two samples (DU2-COMP and DU3-COMP). One DMPS soil sample also had zinc above the USACE criteria. DI-WET metals were analyzed at two different laboratories (Table 6). Calscience detection limits were elevated above several screening levels, so ALS (with lower detection limits) reanalyzed samples for select DI-WET metals. Copper and lead were above screening levels in most composite samples but also in most DMPS soil samples, indicating consistent concentrations of these elements. Nickel and zinc were above the screening levels and higher than the DMPSs in one dredge unit (DU4-COMP); however, initial analysis from Calscience were non-detect at levels below the screening level (29.8U and 35.2U micrograms per liter, respectively), indicating a potential sample heterogeneity issue. Overall, DI-WET metals in dredge material do not seem to be significantly greater than background soil concentrations and are generally below USACE upland disposal criteria. Hardness was measured in site surface water and is provided in Table 7. Notice of Intent 8 June 2017

14 4.1.2 Polycyclic Aromatic Hydrocarbons PAHs were below USACE criteria (RWQCB 2004) except for benzo(a)pyrene, which was slightly above the screening level in two samples (DU2-COMP and DU4-COMP) Total Petroleum Hydrocarbons There are no TPH screening levels. Several samples had no detection of TPH. Samples with detections had concentrations of diesel and motor oil range hydrocarbons near the method detection limit. 4.2 Antidegradation Assessment Results from new horizon composite samples that represent the predicted post-dredge surface layer were screened against freshwater Probable Effects Level (PEL) Screening Levels (NOAA 2008). Dredge composites that exceeded a PEL were triggered for new horizon testing to determine if the new surface was above the screening level. In general, dredge material and/or new horizon samples are below freshwater PELs. In consultation with the RWQCB, new horizon surface sediment was not considered a benthic risk and bioassay analyses were not triggered for analysis Metals Cadmium was above the PEL in one composite sample (DU3-COMP). The associated new horizon sample was below the PEL. Nickel was slightly above the PEL in four composite samples (DU2-COMP, DU3-COMP, DU7-COMP, and DU8-COMP) and had similar concentrations in the new horizon samples. Upland soil background samples have similar nickel concentrations as the dredge and new horizon samples, indicating a regional concentration above the PEL Polycyclic Aromatic Hydrocarbons Two dredge samples exceed a PEL. Sample composite DU4-COMP has acenaphthylene above the PEL and DU5-COMP has acenaphthylene and fluorene above the PEL. The associated new horizon samples had lower concentrations and were below PELs except for acenaphthylene in sample DU5-Z, which was still slightly above the PEL. 4.3 Quality Assurance/Quality Control Laboratory quality assurance and quality control (QA/QC) procedures, where applicable, included initial and continuing instrument calibrations, laboratory control samples (LCSs), laboratory replicates, matrix spike and matrix spike duplicate (MS/MSD) samples, surrogate spikes (for organic analyses), and method blanks. All QC samples were analyzed at the frequencies required in the SAP. There were some MS/MSD results that indicate potential matrix interference in some PAH compounds (fluoranthene, phenanthrene, and pyrene) and metals (barium, chromium, lead, nickel, and zinc). The data quality assessment indicates that data are usable and complete (all samples and tests analyzed in accordance with the SAP). Notice of Intent 9 June 2017

15 5 Conclusion Hydraulically dredged sediments will be placed directly upland and there is no anticipated discharge back into the river. While the DI-WET metals tests indicated elevated levels of copper and lead in most samples, similar concentrations are already present in the DMPS soils. The one DU with elevated nickel and zinc seems to be a data anomaly since the original result was non-detect. The new horizon surface layer will have lower concentrations than the pre-dredge surface and is below NOAA PELs, except for one slight exceedance of acenaphthylene. It is anticipated that maintenance dredging at the Port docks will not cause any negative impact to the water quality or biologically active zone. Notice of Intent 10 June 2017

16 6 References Anchor QEA, Sampling and Analysis Plan. Prepared for Port of Stockton. NOAA (National Oceanic and Atmospheric Administration), Screening Quick Reference Tables (SQuiRTs). RWQCB (California Regional Water Quality Control Board, Central Valley Region), Order No. R : Waste Discharge Requirements for United States Army Corps of Engineers, Department of Water Resources and The Port of Stockton, Stockton Deep Water Ship Channel Maintenance Dredging Activities from Channel Mile 4.4 to Mile 41.0 Contra Costa, Sacramento and San Joaquin Counties. RWQCB, Order No. R : General Waste Discharge Requirements for Maintenance Dredging Operations, Sacramento-San Joaquin Delta. Notice of Intent 11 June 2017

17 Tables

18 Table 1 Core Collection Summary Authorized Port of Total Mudline Depth Plus Sample Interval Stockton Dredge Docks Dredge Collection Depth 2 foot Beneath Mudline Complex Unit Included Volume 3 Station ID Date X Coordinate 1 Y Coordinate 1 (feet MLLW) Overdredge Interval (feet MLLW) Composite Samples DU1-1 3/23/ A to Z to DU1-COMP: DU1-1 and DU1-2 Surface (A) intervals DU1 2, 3 5,155 DU1-2 3/23/ A to Z to DU1-Z (Archive): DU1-1 and DU1-2 New Horizon (Z) intervals A to DU2-COMP: DU2-1 3/22/ DU2-1, DU2-2, and Z to DU2-3 DU2 4, 5, 6 10,612 DU2-2 3/22/ A to Z to Surface (A) intervals DU2-Z (Archive): DU2-1, DU2-2, and A to DU2-3 East Complex DU2-3 3/22/ Z to New Horizon (Z) intervals DU3 7, 8, 9, 10, 11 6,851 DU A to (Attempt 1) 3/21/2017 DU Z to (Attempt 3) A to DU3-2 3/21/ Z to DU3-COMP: DU3-1 (#1) and DU3-2 Surface (A) intervals DU3-Z (Archive): DU3-1 (#3) and DU3-2 New Horizon (Z) intervals DU4-1 3/21/ A to Z to DU4-COMP: DU4-1 and DU4-2 Surface (A) intervals DU4 12, 13 8,360 DU4-2 3/21/ A to Z to DU4-Z (Archive): DU4-1 and DU4-2 New Horizon (Z) intervals A to DU5-COMP: DU5-1 3/22/ DU5-1, DU5-2, and Z to DU5-3 DU5 14, 15, 16 14,053 DU5-2 3/23/ A to Z to Surface (A) intervals DU5-Z (Archive): DU5-1, DU5-2, and A to DU5-3 DU5-3 3/22/ New Horizon (Z) Z to intervals A to DU6-COMP: DU6-1 3/23/ DU6-1, DU6-2, and Z to DU6-3 DU6 17, 18 11,399 DU6-2 3/23/ A to Z to Surface (A) intervals; DU6-Z (Archive): DU6-1, DU6-2, and West Complex DU6-3 3/23/ A to Z to DU6-3 New Horizon (Z) intervals DU7-1 3/24/ A to Z to DU7-COMP: DU7-1 and DU7-2 Surface (A) intervals DU7 19, 19A 9,281 DU7-2 3/24/ A to Z to DU7-Z (Archive): DU7-1 and DU7-2 New Horizon (Z) intervals DU8-1 3/24/ A to Z to DU8-COMP: DU8-1 and DU8-2 Surface (A) intervals DU8 20 8,865 DU8-2 3/24/ A to Z to DU8-Z (Archive): DU8-1 and DU8-2 New Horizon (Z) intervals Notes: 1. Coordinates are in North American Datum of 1983, California State Plane Zone III, U.S. Feet. A: Surface sediment interval is the mudline elevation to the authorized dredge depth plus 2-foot overdredge MLLW: mean lower low water Z: New Horizon interval is an additional 1 foot below the Surface (A) interval Notice of Intent Port of Stockton Maintenance Dredging Sediment Characterization Page 1 of 1 June 2017

19 Table 2 Dredge Management Placement Site Soil Collection Summary Port of Stockton DMPS Station ID X Coordinate 1,2 Y Coordinate 1, 2 Composite Samples Sample Interval 3 RI RI1-COMP Roberts Island RI RI2-COMP RI RI3-COMP 0- to 2-feet RRI RRI1-COMP Rough and Ready RRI RRI2-COMP Island RRI RRI3-COMP Notes: 1. Coordinates are in North American Datum of 1983, California State Plane Zone III, U.S. Feet. 2. Coordinates are the centroid of the three sampling locations to form each composite sample. 3. Three representative 0- to 2-foot soil samples were combined and homogenized to form three composite samples from each DMPS. DMPS: dredge material placement site Notice of Intent Port of Stockton Maintenance Dredging Sediment Characterization Page 1 of 1 June 2017

20 Table 3 Sample Inventory Sample Notes: Total DI-WET: deionized water waste extraction test DOC: dissolved organic carbon PAH: polycyclic aromatic hydrocarbon TDS: total dissolved solids TPH: total petroleum hydrocarbons Hexavalent Geotech: Grain Size/ Bulk Density/ Samples Delivered to Laboratory Ammonia and Total Solids/ Total Organic ph and Cation Exchange Tier 2 analyses were triggered on "new horizon" samples based on Probable Effects Level screening level criteria exceedances in the composite sample DI-WET (Metals, DOC, Chemistry Bioassay Alkalinity Matrix Sample ID Metals Chromium PAHs TPH Moisture Content Sulfide Carbon Capacity TDS, ph) Archive Archive (CaCO3) RI1-COMP X X X X X X X X X X RI2-COMP X X X X X X X X X X Soil RI3-COMP X X X X X X X X X X RRI1-COMP X X X X X X X X X X RRI2-COMP X X X X X X X X X X RRI3-COMP X X X X X X X X X X DU1-COMP X X X X X X X X X X DU1-Z X X -- DU2-COMP X X X X X X X X X X DU2-Z Tier X X -- DU3-COMP X X X X X X X X X X DU3-Z Tier X X -- DU4-COMP X X X X X X X X X X Sediment DU4-Z Tier X X -- DU5-COMP X X X X X X X X X X DU5-Z Tier X X -- DU6-COMP X X X X X X X X X X DU6-Z X X -- DU7-COMP X X X X X X X X X X DU7-Z Tier X X -- DU8-COMP X X X X X X X X X X DU8-Z Tier X X -- Surface Water DU-SITEWATER X Notice of Intent Port of Stockton Maintenance Dredging Sediment Characterization Page 1 of 1 June 2017

21 Table 4 Sediment Results Sample ID DU1-COMP_ DU2-COMP_ DU3-COMP_ DU4-COMP_ DU5-COMP_ DU6-COMP_ DU7-COMP_ DU8-COMP_ Sample Type Dredge Material Dredge Material Dredge Material Dredge Material Dredge Material Dredge Material Dredge Material Dredge Material Sample Date 3/23/2017 3/22/2017 3/21/2017 3/21/2017 3/22/2017 3/23/2017 3/24/2017 3/24/2017 Depth Probable Upland See Table 1 See Table 1 See Table 1 See Table 1 See Table 1 See Table 1 See Table 1 See Table 1 Matrix Effects Level Disposal SE SE SE SE SE SE SE SE Analytes Method (Freshwater) 1 Criteria 2 Conventional Parameters (mg/kg) Ammonia as nitrogen SM4500NH Sulfide E Conventional Parameters (pct) Moisture (water) content D Total organic carbon SW9060A Total solids SM2540B Conventional Parameters (su) ph SW9045C Grain Size (pct) Total Gravel D4464M 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U Total Sand D4464M Total Silt D4464M Total Fines (silt + clay) D4464M Total Clay D4464M Metals (meq/100g) Sodium SW Metals (mg/kg) Aluminum SW Arsenic SW Barium SW Cadmium SW Chromium SW Chromium VI SW7196A 1.2 J 0.48 U 0.35 U 0.39 J 0.82 J 0.42 J 0.98 J 1.2 J Copper SW Lead SW Manganese SW Mercury SW7471A Molybdenum SW J J Nickel SW Selenium SW Zinc SW Polycyclic Aromatic Hydrocarbons (µg/kg) 2-Methylnaphthalene SW8270CSIM 11 J J J 4.2 J 4.2 U Acenaphthene SW8270CSIM J J Acenaphthylene SW8270CSIM U 3.9 U 14 J 6.1 J 3 U 3.3 J 2.9 U 3.2 U Anthracene SW8270CSIM J Benzo(a)anthracene SW8270CSIM Benzo(a)pyrene SW8270CSIM J J Benzo(b)fluoranthene SW8270CSIM Benzo(g,h,i)perylene SW8270CSIM U 9 J 15 J 14 J Benzo(k)fluoranthene SW8270CSIM Chrysene SW8270CSIM Dibenzo(a,h)anthracene SW8270CSIM J 15 J 14 J U 3.4 J 6 J 3.8 J Fluoranthene SW8270CSIM Fluorene SW8270CSIM U J Indeno(1,2,3-c,d)pyrene SW8270CSIM J 8.6 J 16 J 12 J Naphthalene SW8270CSIM J J U 5.7 U 6.2 U Phenanthrene SW8270CSIM Pyrene SW8270CSIM Total cpah TEQ (7 minimum CAEPA 2005) (U = 1/2) J 97.8 J 79.2 J J J J J Total PAH (16) (U = 1/2) J 2134 J 1538 J J J J J J Notice of Intent Port of Stockton Maintenance Dredging Sediment Characterization Page 1 of 4 June 2017

22 Table 4 Sediment Results Sample ID DU1-COMP_ DU2-COMP_ DU3-COMP_ DU4-COMP_ DU5-COMP_ DU6-COMP_ DU7-COMP_ DU8-COMP_ Sample Type Dredge Material Dredge Material Dredge Material Dredge Material Dredge Material Dredge Material Dredge Material Dredge Material Sample Date 3/23/2017 3/22/2017 3/21/2017 3/21/2017 3/22/2017 3/23/2017 3/24/2017 3/24/2017 Depth Probable Upland See Table 1 See Table 1 See Table 1 See Table 1 See Table 1 See Table 1 See Table 1 See Table 1 Matrix Effects Level Disposal SE SE SE SE SE SE SE SE Analytes Method (Freshwater) 1 Criteria 2 Total Petroleum Hydrocarbons (mg/kg) Diesel range hydrocarbons SW8015BM 2.7 U 2.8 U 3.5 J 2.3 J 2.1 U 2.3 J J Motor oil range hydrocarbons SW8015BM 2 U 2 U U 1.6 U 1.3 U J Notes: Detected concentration is greater than the Probable Effects Level (PEL) Detected concentration is greater than 2016 U.S. Army Corps of Engineers Notice of Intent Criteria Bold: Detected result 1. PELs are based on National Oceanic and Atmospheric Administration Screening Quick Reference Tables for screening benthic toxicity (2008). 2. Criteria is based from Table A.3 in California Regional Water Quality Control Board Central Valley Region General Order No. R µg/kg: microgram per kilogram CAEPA: California Environmental Protection Agency cpah: carcinogenic polycyclic aromatic hydrocarbon J: Estimated value meq/100g: millequivalents per 100 grams mg/kg: milligram per kilogram PAH: polycyclic aromatic hydrocarbon pct: percent su: standard units TEQ: toxic equivalency U: Compound analyzed, but not detected above detection limit Notice of Intent Port of Stockton Maintenance Dredging Sediment Characterization Page 2 of 4 June 2017

23 Table 4 Sediment Results Sample ID Sample Type Sample Date Depth Matrix Probable Effects Level Upland Disposal Analytes Method (Freshwater) 1 Criteria 2 Conventional Parameters (mg/kg) Ammonia as nitrogen SM4500NH3 Sulfide E376.2 Conventional Parameters (pct) Moisture (water) content D2216 Total organic carbon SW9060A Total solids SM2540B Conventional Parameters (su) ph SW9045C Grain Size (pct) Total Gravel D4464M Total Sand D4464M Total Silt D4464M Total Fines (silt + clay) D4464M Total Clay D4464M Metals (meq/100g) Sodium SW9081 Metals (mg/kg) Aluminum SW6020 Arsenic SW Barium SW6020 Cadmium SW Chromium SW Chromium VI SW7196A Copper SW Lead SW Manganese SW6020 Mercury SW7471A Molybdenum SW6020 Nickel SW Selenium SW Zinc SW Polycyclic Aromatic Hydrocarbons (µg/kg) 2-Methylnaphthalene SW8270CSIM Acenaphthene SW8270CSIM Acenaphthylene SW8270CSIM 128 Anthracene SW8270CSIM Benzo(a)anthracene SW8270CSIM Benzo(a)pyrene SW8270CSIM Benzo(b)fluoranthene SW8270CSIM 620 Benzo(g,h,i)perylene SW8270CSIM Benzo(k)fluoranthene SW8270CSIM 610 Chrysene SW8270CSIM Dibenzo(a,h)anthracene SW8270CSIM Fluoranthene SW8270CSIM Fluorene SW8270CSIM Indeno(1,2,3-c,d)pyrene SW8270CSIM 620 Naphthalene SW8270CSIM Phenanthrene SW8270CSIM 515 Pyrene SW8270CSIM Total cpah TEQ (7 minimum CAEPA 2005) (U = 1/2) Total PAH (16) (U = 1/2) DU1-Z_ DU2-Z_ DU3-Z_ DU4-Z_ DU5-Z_ DU6-Z_ DU7-Z_ DU8-Z_ New Horizon New Horizon New Horizon New Horizon New Horizon New Horizon New Horizon New Horizon 3/23/2017 3/22/2017 3/21/2017 3/21/2017 3/22/2017 3/23/2017 3/24/2017 3/24/2017 See Table 1 See Table 1 See Table 1 See Table 1 See Table 1 See Table 1 See Table 1 See Table 1 SE SE SE SE SE SE SE SE J J J J J J J J J J J J J J J J J J Notice of Intent Port of Stockton Maintenance Dredging Sediment Characterization Page 3 of 4 June 2017

24 Table 4 Sediment Results Analytes Total Petroleum Hydrocarbons (mg/kg) Diesel range hydrocarbons Motor oil range hydrocarbons Notes: Sample ID Sample Type Sample Date Depth Matrix Method SW8015BM SW8015BM Probable Effects Level (Freshwater) 1 Upland Disposal Criteria 2 Detected concentration is greater than the Probable Effects Level (PEL) Detected concentration is greater than 2016 U.S. Army Corps of Engineers Notice of Intent Criteria Bold: Detected result 1. PELs are based on National Oceanic and Atmospheric Administration Screening Quick Reference Tables for screening benthic toxicity (2008). DU1-Z_ DU2-Z_ DU3-Z_ DU4-Z_ DU5-Z_ DU6-Z_ DU7-Z_ DU8-Z_ New Horizon New Horizon New Horizon New Horizon New Horizon New Horizon New Horizon New Horizon 3/23/2017 3/22/2017 3/21/2017 3/21/2017 3/22/2017 3/23/2017 3/24/2017 3/24/2017 See Table 1 See Table 1 See Table 1 See Table 1 See Table 1 See Table 1 See Table 1 See Table 1 SE SE SE SE SE SE SE SE Criteria is based from Table A.3 in California Regional Water Quality Control Board Central Valley Region General Order No. R µg/kg: microgram per kilogram CAEPA: California Environmental Protection Agency cpah: carcinogenic polycyclic aromatic hydrocarbon J: Estimated value meq/100g: millequivalents per 100 grams mg/kg: milligram per kilogram PAH: polycyclic aromatic hydrocarbon pct: percent su: standard units TEQ: toxic equivalency U: Compound analyzed, but not detected above detection limit Notice of Intent Port of Stockton Maintenance Dredging Sediment Characterization Page 4 of 4 June 2017

25 Table 5 Upland Soil Results Sample ID RI1-COMP_ RI2-COMP_ RI3-COMP_ RRI1-COMP_ RRI2-COMP_ RRI3-COMP_ Sample Type DMPS DMPS DMPS DMPS DMPS DMPS Sample Date 3/20/2017 3/20/2017 3/20/2017 3/20/2017 3/20/2017 3/20/2017 Depth Probable Upland 0-2 feet 0-2 feet 0-2 feet 0-2 feet 0-2 feet 0-2 feet Matrix Effects Level Disposal SO SO SO SO SO SO Analytes Conventional Parameters (mg/kg) Method (Freshwater) 1 Criteria 2 Ammonia as nitrogen SM4500NH Sulfide E U 0.46 U U 0.53 U Conventional Parameters (pct) Moisture (water) content D Total organic carbon SW9060A U 0.62 Total solids SM2540B Conventional Parameters (su) ph SW9045C Grain Size (pct) Total Gravel D4464M 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U Total Sand D4464M Total Silt D4464M Total Fines (silt + clay) D4464M Total Clay D4464M Metals (meq/100g) Sodium SW Metals (mg/kg) Aluminum SW Arsenic SW Barium SW Cadmium SW J J Chromium SW Chromium VI SW U 0.4 J 0.29 U 0.27 U 0.23 U 0.3 U Copper SW Lead SW Manganese SW Mercury SW7471A Molybdenum SW U 0.44 Nickel SW Selenium SW U U U 0.09 U U 0.1 U Zinc SW Polycyclic Aromatic Hydrocarbons (µg/kg) 2-Methylnaphthalene SW8270CSIM 8.8 J 2.8 U 5 J 7.1 J 2.4 U 3.2 U Acenaphthene SW8270CSIM J 7.4 J U 3.2 U Acenaphthylene SW8270CSIM J 2.1 U 2.5 J 2.2 U 1.9 U 2.5 U Anthracene SW8270CSIM J 9.1 J U 4.8 U Benzo(a)anthracene SW8270CSIM U 3 U Benzo(a)pyrene SW8270CSIM J U 2.5 U Benzo(b)fluoranthene SW8270CSIM U 3.8 U Benzo(g,h,i)perylene SW8270CSIM J J 1.6 U 2.1 U Benzo(k)fluoranthene SW8270CSIM U 3.8 U Chrysene SW8270CSIM U 3.1 U Dibenzo(a,h)anthracene SW8270CSIM J 4.1 J 6.9 J 3.8 J 2 U 2.7 U Fluoranthene SW8270CSIM J 2.5 U Fluorene SW8270CSIM J 8.8 J U 4.3 U Indeno(1,2,3-c,d)pyrene SW8270CSIM J J 1.7 U 2.2 U Notice of Intent Port of Stockton Maintenance Dredging Sediment Characterization Page 1 of 2 June 2017

26 Table 5 Upland Soil Results Sample ID RI1-COMP_ RI2-COMP_ RI3-COMP_ RRI1-COMP_ RRI2-COMP_ RRI3-COMP_ Sample Type DMPS DMPS DMPS DMPS DMPS DMPS Sample Date 3/20/2017 3/20/2017 3/20/2017 3/20/2017 3/20/2017 3/20/2017 Depth Probable Upland 0-2 feet 0-2 feet 0-2 feet 0-2 feet 0-2 feet 0-2 feet Matrix Effects Level Disposal SO SO SO SO SO SO Analytes Method (Freshwater) 1 Criteria 2 Naphthalene SW8270CSIM J 4.2 J 6.6 J U 4.8 U Phenanthrene SW8270CSIM U 3.1 U Pyrene SW8270CSIM J 3.1 U Total cpah TEQ (7 minimum CAEPA 2005) (U = 1/2) J J J J 1.9 U 2.5 U Total PAH (16) (U = 1/2) J J J 479 J 23.9 J 4.8 U Total Petroleum Hydrocarbons (mg/kg) Diesel range hydrocarbons SW8015BM 1.7 U 1.5 U 1.8 J 1.5 U 1.3 U 1.7 U Motor oil range hydrocarbons SW8015BM 1.3 U 1.1 U 1.7 J 3.5 J 1.6 J 1.3 U Notes: Detected concentration is greater than the Probable Effects Level (PEL) Detected concentration is greater than 2016 U.S. Army Corps of Engineers Notice of Intent Criteria Bold: Detected result 1. PELs are based on National Oceanic and Atmospheric Administration Screening Quick Reference Tables for screening benthic toxicity (2008). 2. Criteria is based from Table A.3 in California Regional Water Quality Control Board Central Valley Region General Order No. R µg/kg: microgram per kilogram CAEPA: California Environmental Protection Agency cpah: carcinogenic polycyclic aromatic hydrocarbon DMPS: dredge material placement site J: Estimated value mg/kg: milligram per kilogram PAH: polycyclic aromatic hydrocarbon pct: percent su: standard units TEQ: toxic equivalency U: Compound analyzed, but not detected above detection limit Notice of Intent Port of Stockton Maintenance Dredging Sediment Characterization Page 2 of 2 June 2017

27 Table 6 DI-WET Results Sample ID DU1-COMP_ DU2-COMP_ DU3-COMP_ DU4-COMP_ DU5-COMP_ DU6-COMP_ DU7-COMP_ Sample Type Dredge Material Dredge Material Dredge Material Dredge Material Dredge Material Dredge Material Dredge Material Sample Date 3/23/2017 3/22/2017 3/21/2017 3/21/2017 3/22/2017 3/23/2017 3/24/2017 Depth Upland See Table 1 See Table 1 See Table 1 See Table 1 See Table 1 See Table 1 See Table 1 Matrix Disposal Leachate Leachate Leachate Leachate Leachate Leachate Leachate Analytes Method Criteria 1 Conventional Parameters, Dissolved (mg/l) Dissolved organic carbon SM5310B Total dissolved solids SM2540C Conventional Parameters (su) ph SW Metals (DI-WET) (µg/l) Aluminum SW6010B Arsenic SW6010B Barium SW6010B U 30.9 J 40 J 43.1 J 55.4 J 29.6 U 69.7 J Cadmium SW6010B U J J J J J Chromium SW6010B Copper SW6010B Lead SW6010B Manganese SW6010B 27 U U 313 Mercury SW7470A J J J U J J Molybdenum SW6010B 27.8 U 31 J 27.8 U 27.8 U 27.8 U 27.8 U 27.8 U Nickel SW6010B Selenium SW6010B J J 0.9 J 1.8 J 2 J 1.5 J Zinc SW6010B Metals (µg/l) Chromium VI SW7196A 11 4 U 4 U 4 U 4 U 4 U 4 U 4 U Notes: Detected concentration is greater than 2016 U.S. Army Corps of Engineers Notice of Intent Criteria Bold: Detected result 1. Criteria is based from Table A.3 in California Regional Water Quality Control Board Central Valley Region General Order No. R µg/l: microgram per liter DI-WET: Deionized Water Waste Extraction Test DMPS: dredge material placement site J: Estimated value mg/l: milligram per liter su: standard units U: Compound analyzed, but not detected above detection limit Notice of Intent Port of Stockton Maintenance Dredging Sediment Characterization Page 1 of 2 June 2017

28 Table 6 DI-WET Results Sample ID Sample Type Sample Date Depth Upland Matrix Disposal Analytes Method Criteria 1 Conventional Parameters, Dissolved (mg/l) Dissolved organic carbon SM5310B Total dissolved solids SM2540C Conventional Parameters (su) ph SW9040 Metals (DI-WET) (µg/l) Aluminum SW6010B Arsenic SW6010B 10 Barium SW6010B 100 Cadmium SW6010B 5 Chromium SW6010B 50 Copper SW6010B 9 Lead SW6010B 2.5 Manganese SW6010B Mercury SW7470A 0.05 Molybdenum SW6010B Nickel SW6010B 52 Selenium SW6010B 5 Zinc SW6010B 100 Metals (µg/l) Chromium VI SW7196A 11 Notes: Detected concentration is greater than 2016 U.S. Army Corps of Engineers Notice of Intent Criteria Bold: Detected result 1. Criteria is based from Table A.3 in California Regional Water Quality Control Board Central Valley Region General Order No. R DU8-COMP_ RI1-COMP_ RI2-COMP_ RI3-COMP_ RRI1-COMP_ RRI2-COMP_ RRI3-COMP_ Dredge Material DMPS DMPS DMPS DMPS DMPS DMPS 3/24/2017 3/20/2017 3/20/2017 3/20/2017 3/20/2017 3/20/2017 3/20/2017 See Table feet 0-2 feet 0-2 feet 0-2 feet 0-2 feet 0-2 feet Leachate Leachate Leachate Leachate Leachate Leachate Leachate J U J 69 J 80.9 J 78.3 J 29.6 U 36.3 J 64.6 J U J U U J U 27.8 U 27.8 U 27.8 U 27.8 U 27.8 U 27.8 U J 0.4 U 1.2 J 0.9 J 1.4 J U 4 U 4 U 4 U 4 U 6.4 J 4 U µg/l: microgram per liter DI-WET: Deionized Water Waste Extraction Test DMPS: dredge material placement site J: Estimated value mg/l: milligram per liter su: standard units U: Compound analyzed, but not detected above detection limit Notice of Intent Port of Stockton Maintenance Dredging Sediment Characterization Page 2 of 2 June 2017

29 Table 7 Surface Water Result DU-SITEWATER_ Surface Water 3/24/ feet WS Analyte Method Conventional Parameters (mg/l) Hardness as CaCO3 SM2340C 40 Notes: Bold: Detected result CaCO3: calcium carbonate mg/l: milligram per liter Sample ID Sample Type Sample Date Depth Matrix Notice of Intent Port of Stockton Maintenance Dredging Sediment Characterization Page 1 of 1 June 2017

30 Figures

31 Sacramento ^! Stockton San Francisco!!( 2 Stockton Roberts Island Bu rns San Joaquin River/Stockton DWSC Cutoff!( 20 19A!( 19!( Stockton 18!( 17!(!( 16 15!( 14!( 5 5 Rough and Ready Island/ West Complex !(!(!( 12 & 13!( 6 5 4!(!(!( 7 & 8!( 2 & 3!( San Joaquin River East Complex LEGEND:!( Dock Location and Designation Potential Dredge Material Placement Sites!( 1 Rough and Ready Island Dredge Material Placement Site!( 2 Roberts Island Dredge Material Placement Site!( 1 San Joa q uin River Publish Date: 2017/06/08, 11:41 AM User: jsfox Filepath: \\orcas\gis\jobs\port_of_stockton_0377\maps\noi\sitevicinitymap.mxd [ 0 4,000 Feet Figure 1 Port of Stockton Docks and Dredge Material Placement Sites Notice of Intent Port of Stockton Maintenance Dredging Sediment Characterization

32 DOCK 14 DU8-2!< DU8-1!< DOCK DOCK DOCK 19A DU8 DU8 DU7 DU7-2 DOCK 19A!< LEGEND:!< Sediment Core Locations Dredge Unit Dock Boundary Lines Dock Area Bathymetry (2016/2017) Elevation in feet (MLLW) DU7 DU7-1!< DOCK DOCK DU6-3!< DOCK 18 San Joaquin River NOTES: Horizontal Datum: NAD 83 California State Plane Zone III (ft.) Vertical Datum: Mean Lower Low Water (MLLW) Aerial image provided by ESRI and their partners. DU6-2!< DU6 DOCK 17 DU6-1!< DU5-3!< DOCK 16 [ Feet Rough and Ready Island DU5-2!< DOCK 15 DU5 DU5-1!< Publish Date: 2017/06/08, 1:17 PM User: jsfox Filepath: \\orcas\gis\jobs\port_of_stockton_0377\maps\noi\dredgeareasamplelocations.mxd Figure 2a West Complex Actual Coring Locations Notice of Intent Port of Stockton Maintenance Dredging Sediment Characterization

33 5 5 LEGEND:!< Sediment Core Locations Dredge Unit Dock Boundary Lines Dock Area Bathymetry (2016/2017) Elevation in feet (MLLW) !< DOCK 12 & 13 DOCK 12 & 13 DU4 DU4 DU4-1!< San Joaquin River DOCK 10 DOCK 11 DOCK 10 DU3-2 DOCK 9 DU3!<!< DOCK DOCK 7 & 8!< DOCK 6 DOCK 5 DU2-3 DU3-1 DOCK 4 DOCK 5 DOCK 4 DU2-2 DU2!< DU2-1 DU1-2!< DOCK DOCK 2 & 3 DU1 DU1!< DU1-1 NOTES: Horizontal Datum: NAD 83 California State Plane Zone III (ft.) Vertical Datum: Mean Lower Low Water (MLLW) Aerial image provided by ESRI and their partners. DU4-2!< [ Port of Stockton Feet Publish Date: 2017/06/08, 1:17 PM User: jsfox Filepath: \\orcas\gis\jobs\port_of_stockton_0377\maps\noi\dredgeareasamplelocations.mxd Figure 2b East Complex Actual Coring Locations Notice of Intent Port of Stockton Maintenance Dredging Sediment Characterization

34 LEGEND:!. Upland DMPS Composite Sample Potential Dredge Material Placement Sites San San Joaquin Joaquin River River NOTES: Horizontal Datum: NAD 83 California State Plane Zone III (ft.) Vertical Datum: Mean Lower Low Water (MLLW) Aerial image provided by ESRI and their partners. Roberts Island DMPS RI-1!. RI-3!. RI-2!. [ Feet Publish Date: 2017/06/08, 1:09 PM User: jsfox Filepath: \\orcas\gis\jobs\port_of_stockton_0377\maps\noi\uplanddmplocations.mxd Figure 3a Roberts Island Dredge Material Placement Site Sample Locations Notice of Intent Port of Stockton Maintenance Dredging Sediment Characterization

35 RRI-3!. LEGEND:!. Upland DMPS Composite Sample Potential Dredge Material Placement Sites RRI-2!. RRI-1!. NOTES: Horizontal Datum: NAD 83 California State Plane Zone III (ft.) Vertical Datum: Mean Lower Low Water (MLLW) Aerial image provided by ESRI and their partners. Rough and Ready Island DMPS San Joaquin River [ Feet Burns Burns Cutoff Cutoff Publish Date: 2017/06/08, 1:09 PM User: jsfox Filepath: \\orcas\gis\jobs\port_of_stockton_0377\maps\noi\uplanddmplocations.mxd Figure 3b Rough and Ready Island Dredge Material Placement Site Sample Locations Notice of Intent Port of Stockton Maintenance Dredging Sediment Characterization