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Phase If Environmental Site Assessment Report <br /> Buena Vista Storm Drain,Stockton,CA <br /> March 30,2005 <br /> Page 5 <br /> Table 3 Groundwater Sample Laboratory Analytical Results for Metals <br /> Constituent: Cadmium Chromium Copper Lead Nickel Zinc <br /> Units: mg/L mg/L mg/L mg/L mg/L mg/L <br /> Sample ID Date <br /> 4038C-GP-1 3/15/05 <0.003 0.006 <0.005 <0.005 0.0054 0.011 <br /> 4038C-GP-2 3/15/05 <0.003 0.018 0.021 <0.005 0.016 0.034 <br /> 4038C-GP-3 3/15/05 <0.003 0.007 <0.005 <0.005 0.012 0.021 <br /> 4038C-GP4 3/15/05 <0.003 0.010 <0.005 <0.005 0.024 0.015 <br /> 4038C-GP-5 3/15/05 <0.003 0.056 0.033 <0.005 0.050 1 0.065 <br /> 4038C-GP-6 3/15/05 <0.003 0.026 0.018 <0.005 0.025 0.041 <br /> 4038C-GP-7 3/15/05 <0.003 <0.003 <0.005 <0.005 <0.005 <0.010 <br /> 4038C-GP-8 3/15/05 <0.003 0.021 0.013 <0.005 0.016 0.035 <br /> 4038C-GP-9 3/15/05 <0.003 0.0089 <0.005 <0.005 0.0096 0.022 <br /> 4038C-GP-10 3/15/05 <0.003 0.060 0.032 <0.005 0.048 0.070 <br /> 4038C-GP-11 3/15/05 <0.003 0.045 0.026 <0.005 0.035 0.051 <br /> 4038C-GP-12 3/15/05 <0.003 0.012 1 <0.005 1 <0.005 0.012 0.016 <br /> mg/L:milligrams per liter <br /> 5.0 DISCUSSION <br /> Groundwater was encountered at depths ranging from three to five feet below ground surface (bgs) along <br /> the proposed pipeline alignment and 17 bgs on the levee near the Stockton deep-water channel. <br /> Excavations to depths exceeding three to five feet are likely to encounter groundwater and would require <br /> dewatering during construction activities. <br /> The groundwater samples collected from the borings were analyzed for constituents identified by the City <br /> of Stockton as a requirement for discharging water to the sanitary sewer system. The analyses for these <br /> constituents are the minimum requirement for obtaining a permit to discharge water to the sanitary sewer. <br /> Analyses for additional constituents may be required by the City of Stockton before approval of a <br /> discharge permit but were beyond the scope of this report.Each constituent has a maximum concentration <br /> that cannot be exceeded in order to discharge water to the sanitary sewer system. The maximum <br /> concentration allowed for each constituent is shown in Table 4. <br /> Table 4 Maximum Concentrations Allowed <br /> Constituent Maximum Concentration <br /> TPH 100 mg/L <br /> BTEX 4.57 mg/L Total <br /> 0.5m benzene <br /> MTBE,DIPE, non-detect with a 0.5 mg/L <br /> ETBE,TAME detection limit <br /> TBA 0.5 mg/L <br /> Cadmium 2 mg/L <br /> Chromium 5 mg/L <br /> Copper 6 m <br /> Lead 2 m <br /> Nickel 5 mg/L <br /> Zinc 7 mg/L <br /> tJ CONDOR <br />