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a q. <br /> 6 r - <br /> AM <br /> aA' <br /> IM35 <br /> 12MOM' ' . <br /> u <br /> CIayton <br /> ENVROWPJAL <br /> CONSCU.i>,'TS <br /> iormer UST, from USTs upgradient of the subject site, and from the possible previous <br /> use of pesticides onsite. The soil and groundwater samples were analyzed by the <br /> following methods: <br /> • EPA Method 5030/8015-8020, for gasoline fuel and the volatile hydrocarbons <br /> benzene, toluene, ethylbenzene, and xylene <br /> k <br /> EPA Method 418.1 for total recoverable petroleum hydrocarbons (TRPH) <br /> • EPA Methods 8080 (soil) and 508(water) for organochlorine <br /> pesticides/polychlorinated biphenyls (PCBs) <br /> 3.2 SOIL SAMPLE ANALYTICAL RESULTS <br /> Results of the laboratory analyses of the soil samples are summarized in Table 2. We <br /> compared soil;sample results for TRPH to concentrations in the RWQCB's <br /> ' ,Recommendations for the Evaluation and Investigation of USTs. Table 2 reports only <br /> detected compounds. All other compounds for which analyses were conducted were <br /> i below analytical detection limits. Notable compounds detected are discussed below. <br /> Concentrations of gasoline, toluene, ethylbenzene, and xylene in soil samples from <br /> the borehole for well:A4W-3, next to the old gasoline tank, exceeded LU <br /> FT <br /> guidelines. <br /> Theconcentration of TRPH was 250 ppm in a soil sample from MW-3. Although <br /> regulatory action levels are not set for TRPH specifically, when oil and grease <br /> E concentrations exceed 100 parts per million (ppm; the RWQCB requires a <br /> { soil/groundwater.investigation. The RWQCB developed the 100 ppm level to help <br /> i Ewa <br /> € I ; prioritize cases,not as a cleanup level The level of cleanup is determined by <br /> I <br /> d. assessing the potential for soil contamination to impact groundwater. <br /> 13 GROUNDWATER ANALYTICAL RESULTS <br /> Table 3 summarizes analytical results and compares our findings to regulatory levels. <br /> 1 Table 3 reports only detected compounds. All other compounds for which analyses <br /> were conducted were below analytical detection limits. No compounds detected <br /> i are discussed below. <br /> ,. Groundwater sataples from MW-3 showed low levels of gasoline, ethylbenzene, and <br /> i.,. xylene. The ethylbenzene and xylene are below California DHS action levels. The <br /> concentration of gasoline in t�W-3 was very low. Action levels are not defined for <br /> gasoline in groundwater. <br /> _4.0 EMAYAD <br /> -Obl AND 50FLAERAMON <br /> Based on the results of analysis of soil samples from the borehole for well MW-3, <br /> + Clayton recommended excavating and aerating the soil in and around the location of <br /> ` the removed gasoline tank. Clayton was retained by Interland to supervise the ' <br /> „.! . excavation and aeration of petroleum hydrocarbon-contaminated sail in the vicinity of <br /> MW-3 (Clayton Project No. 29531.00). <br /> 4 <br />