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Phase II Environmental Site Assessment Report <br /> Buena Vista Storm Drain,Stockton,CA <br /> March 30,2005 <br /> Page 4 <br /> Laboratory analytical results indicate that TPH and BTEX were not detected at or above the laboratory <br /> reported detection limits in any of the groundwater samples collected from the 12 borings. MTBE was <br /> detected at a low concentration in the groundwater sample collected from GP-5. Other <br /> oxygenates/additives were not detected at or above the laboratory reported detection limits in the <br /> groundwater sample collected from GP-5. No oxygenates/additives were detected at or above the <br /> laboratory reported detection limits in the groundwater samples collected from the other 11 borings. <br /> Table 2 Groundwater Sample LaboratoryAnal tical Results <br /> Sample I.D. Sample Date B T E X TPH pH Oxygenates/ <br /> (µg/L) (n/L) (Mg/L) (µg/L) (mg/L) Additives(µg/L) <br /> 4038C-GP-1 3/15/05 <0.5 <0.5 <0.5 <1.0 <5.0 7.6 <0.5-<5.0 <br /> 4038C-GP-2 3/15/05 <0.5 <0.5 <0.5 <1.0 <5.0 7.6 <0.5-<5.0 <br /> 4038C-GP-3 3/15/05 <0.5 <0.5 <0.5 <1.0 <5.0 7.3 <0.5-<5.0 <br /> 4038C-GP4 3/15/05 <0.5 <0.5 <0.5 <1.0 <5.0 7.6 <0.5-<5.0 <br /> 4038C-GP-5 3/15/05 <0.5 <0.5 <0.5 <1.0 <5.0 7.7 3.2 TBE <br /> 4038C-GP-6 3/15/05 <0.5 <0.5 <0.5 <1.0 <5.0 7.4 <0.5-<5.0 <br /> 4038C-GP-7 3/15/05 <0.5 <0.5 <0.5 <1.0 <5.0 7.6 <0.5-<5.0 <br /> 4038C-GP-8 3/15/05 <0.5 <0.5 <0.5 <1.0 <5.0 7.7 <0.5-<5.0 <br /> 4038C-GP-9 3/15/05 <0.5 <0.5 <0.5 <1.0 <5.0 7.4 <0.5-<5.0 <br /> 4038C-GP-10 3/15/05 <0.5 <0.5 <0.5 <1.0 <5.0 7.4 <0.5-<5.0 <br /> 4038C-GP-11 3/15/05 <0.5 <0.5 <0.5 <1.0 <5.0 7.2 <0.5-<5.0 <br /> 4038C-GP-12 3/15/05 <0.5 <0.5 <0.5 <1.0 <5.0 7.9 <0.5-<5.0 <br /> Unit Conversions: Analytical <br /> µg/L=micrograms per liter(ppb). B,T,E,X=benzene,toluene,ethyl benzene,total xylenes. <br /> mg/L=milligrams per liter TPH=total petroleum hydrocarbons. <br /> Oxygenates/additives = tertiary-butanol (TBA), methyl tertiary-butyl ether <br /> (MTBE),di-isopropyl ether(DIPE),ethyl tertiary-butyl ether(ETBE),and tertiary- <br /> amyl methyl ether(TAME). <br /> Laboratory analytical results for the selected metals in groundwater samples are shown in Table 3, on the <br /> next page. Copies of laboratory analytical results and chain-of-custody records for the samples are <br /> included in Appendix B. <br /> Laboratory analytical results indicate that low concentrations of chromium, nickel, and zinc were present <br /> in the groundwater samples collected from borings GP-1 through GP-6 and GP-8 through GP-12. Copper <br /> was present in the groundwater samples collected from borings GP-2, GP-5, GP-6, GP-8, GP-10, and GP- <br /> 11. None of the selected metals were detected at or above the laboratory reported detection limits in the <br /> groundwater sample collected from boring GP-7. <br /> il� CONDOR <br />