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Phase II Environmental Site Assessment Report <br /> Buena Vista Storm Drain,Stockton,CA <br /> March 30,2005 <br /> Page 3 <br /> 3.2.2 Depth to Groundwater Measurements <br /> Initial depth-to-water measurements were taken after the temporary PVC screen was inserted into each <br /> boring. Depth-to-water measurements were again taken before the groundwater sample was collected <br /> from each boring. Initial and second depth-to-water measurements are recorded in Table 1,below. . <br /> Table 1 Depth-To-Water Measurements <br /> Boring Initial feet Final feet <br /> GP-1 4.2 4.4 <br /> GP-2 4.6 4.4 <br /> GP-3 5.3 3.3 <br /> GP-4 4.5 4.6 <br /> GP-5 23.2 5.0 <br /> GP-6 10.8 5.2 <br /> GP-7 4.8 4.5 <br /> GP-8 1.9 4.2 <br /> GP-9 4.2 4.9 <br /> GP-10 4.5 5.3 <br /> GP-11 19.3 17.2 <br /> GP-12 4.2 4.7 <br /> Depth-to-water measured from the ground surface. <br /> 3.3 LABORATORY ANALYSES <br /> The groundwater samples collected from the borings were analyzed for constituents identified by the City <br /> of Stockton Municipal Utilities Department(MUD)as a requirement for discharge of water to the sanitary <br /> sewer system. The samples were analyzed for benzene, toluene, ethyl benzene,total xylenes(BTEX), and <br /> selected gasoline oxygenates/additives by EPA Method 8260B; for total petroleum hydrocarbons (TPH) <br /> by EPA Methods 1664; for cadmium, chromium, copper, lead, nickel, and zinc by EPA Method 6010B; <br /> and for pH by EPA Method 150.1. The gasoline oxygenates/additives include methyl tertiary-butyl ether <br /> (MTBE), tertiary-butanol (TBA), di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), and <br /> tertiary-amyl methyl ether(TAME). <br /> 4.0 INVESTIGATION RESULTS <br /> The results of the groundwater investigation include field observations and laboratory analytical results <br /> for the groundwater samples. <br /> 4.1 FIELD OBSERVATIONS <br /> A green tint was noted without odor in the groundwater sample collected from boring GP-2. No <br /> discoloration of the groundwater was noted in the samples collected from the other borings. <br /> 4.2 RESULTS OF LABORATORY ANALYSES <br /> The groundwater sample laboratory analytical results for BTEX, TPH, selected gasoline <br /> oxygenates/additives, and pH are presented in Table 2, on the next page. Copies of laboratory analytical <br /> results and chain-of-custody records for the samples are included in Appendix B. <br /> �.1� CONDOR <br />