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' INTERIM REMEDIAL AC'T'ION PLAN <br /> 4491 West Durham Ferry Road <br /> Tracy, Cahfonua <br /> Delta Project No 40-91-732 <br /> Page 8 <br /> TABLE 4 <br /> CHEMICAL ANALYSIS OF GROUND WATER SAMPLES <br /> Concentrations in Micrograms per Liter Ag1l (ppb) <br /> Sample Date <br /> Hd <br /> Location Samgled Benzene Toluene Ethylbenzene Xylenes EDCa EDBb TPHc T <br /> MW-1 09/04/91 2.3 1 3 <05 35 <05 <05 140 NAA <br /> 04/09/92 430 4,400 1,400 9,200 <2 <2 48,000 <200 <br /> 07/10/92 57 1,200 740 7,300 NA NA 45,000 NA <br /> MW-2 09/04/91 710 700 130 1,300 <05 <05 6,400 NA <br /> 04/09/92 1,400 720 59 250 <05 <05 2,400 <50 <br /> 07/10/92 3,300 1,400 86 980 NA NA 8,800 NA <br /> MW-3 09/04/91 <05 <0 5 <05 <05 <05 <05 <50 NA <br /> 04/09/92 10 <0 5 <05 <05 <05 <05 <50 <50 <br /> 07/10/92 <05 <1 0 <0 5 <05 NA NA <50 NA <br /> Domestic 09/04/91 <05 <0 5 <05 <05 <05 <05 <50 NA <br /> Well 04/09/92 NS <br /> 07/10/92 NS <br /> a 1,2-Dichloroethane <br /> b Ethylene Dtbtnnude <br /> a Total Petroleum Hydrocarbons as gasoline <br /> d Total Petroleum Hydrocarbons as diesel No 2 <br /> NA = Not analyzed <br /> NS = Not sampled <br /> ' Results of the chemical analyses of TPH as gasoline for the soil sample collected from a depth of 5 feet <br /> m monitoring well MW-2 indicated low concentrations of petroleum hydrocarbon constituents were <br /> present Chemical results of the soil sample collected from monitoring well MW-3 indicated petroleum <br /> constituents were below the laboratory's limit of detection Based on PID readings, the majority of <br /> petroleum impacted soils appears to be localized in and around the immediate old tank areas from a depth <br /> of approximately 5 to 15 feet below the surface <br /> Results of the chemical analyses for ground water collected from monitoring well MW-3 and the domestic <br /> water well indicated concentrations of petroleum constituents were generally below the laboratory's limit <br /> RPT045 TA <br />