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Q <br /> Limited Phase 11 Subsurface Investigation Report <br /> Property Lease Port of Stockton <br /> Stockton,California a ntea g ro u p <br /> Antea Group Project No. UPR8298B <br /> an accompanying chain of custody form, on which Antea Group directed the laboratory to analyze the soil samples <br /> for one or more of the following: <br /> • Volatile organic compounds(VOCs) by Environmental Protection Agency(EPA) Method 8260B; <br /> • Poly-chlorinated biphenyls(PCBs) by EPA Method 8082; <br /> • CAM 17 metals(antimony,arsenic, barium, beryllium,cadmium, chromium, cobalt,copper, lead, mercury, <br /> molybdenum, nickel,selenium,silver,thallium,vanadium, &zinc) by EPA Method 6010B/7400;and <br /> • Pesticides by EPA Method 8081. <br /> The requested chemical analyses varied for each boring based on historic data point locations (laterally and <br /> vertically), preexisting analytical data and identified potential data gaps in the areas of planned construction. <br /> Results are discussed below in Section 4.0. The certified laboratory analytical report and chain of custody are <br /> included in Appendix C. <br /> 3.4 Waste Disposal <br /> As per the direction of the San Joaquin County Inspector on site, due to the shallow (near surface) boring depths, <br /> Cascade personnel backfilled the upper one to two feet with the native soil removed at each boring's location. No <br /> waste was generated. <br /> 4.0 SOIL SAMPLE ANALYTICAL RESULTS AND DISCUSSION <br /> TestAmerica reported the soil results for the 41 soil samples submitted in laboratory report Job I.D. 720-56810-1, <br /> dated April 29, 2014 (Appendix C). The following sections summarize the soil results by contaminant of concern. <br /> Refer to Tables 1A and 1B for summaries of the soil analytical results and comparison to the construction and <br /> trench worker scenario Direct Exposure Soil Screening Levels (SSLs), as referenced in the California Regional Water <br /> Quality Board (RWQCB) San Francisco Bay Region's Screening for Environmental Concerns at Sites with <br /> Contaminated Soil and Groundwater,to address worker safety during potential construction activities on the site. <br /> 4.1 Volatile Organic Compounds (VOCs) <br /> The laboratory analyzed a total of 37 soil samples for VOCs. Of the 37, only four of the samples submitted (1.5-2.0 <br /> feet bgs in B-10, 5.5-6.0 feet bgs in B-3, B-6, and B-9) had detections of VOCs greater than the laboratory reporting <br /> limits(LRLs). All of the detections were well below their respective SSLs. Table 1A includes a summary of all VOCs <br /> reported during this sampling investigation. <br /> 4.2 Total Metals <br /> Antea Group requested California Administrative Manual (CAM)-17 metals analyses for all 41 soil samples; the 17 <br /> listed metals are also referred to as "Title 22" metals. The analytical data showed detections of 15 metals <br /> (antimony, arsenic, barium, beryllium, cadmium, chromium, cobalt, copper, lead, mercury, molybdenum, nickel, <br /> 5 www.anteagroup.com <br />