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ti <br /> d � <br /> i <br /> t <br /> KEI-P91-0202.P2 <br /> April 9, 1991 <br /> Page 2 <br /> the San Joaquin County Local Health Department. After soil <br /> sampling was completed, pipe trenches were excavated to the <br /> sample depths. Pipe trench sample point locations are shown <br /> on the attached Site Plan, Figure 1. <br /> On March 19, 1991, KEI returned to the site to observe <br /> additional soil excavation in the area of sample point as <br /> outlined in KEIIs revised work plan/proposal <br /> 0202.PIR) dated March 11, 1991. Following the excavation of <br /> soil from the fuel tank pit to the initial sample depths, <br /> additional soil was removed from beneath sample point location <br /> C2 to a depth of about wsoil <br /> In <br /> sample, labeled C2(26) , was collected from this depth. <br /> and SW- <br /> w, <br /> four soil samples, labeled SW-N, SW-S, <br /> W, were collected from the sidewalls of the excavation at a <br /> depth of approximately 25.5 feet below grade. Sample point <br /> locations are as indicated on the attached site Plan, Figure <br /> 2. <br /> All samples were analyzed by Sequoia Analytical Laboratory in <br /> Concord, California. All fuel tank pit and product pipe <br /> trench soil samples were analyzed for benzene, toluene, <br /> xylenes and ethylbenzene (BTX&E) , for total lead, and for <br /> ethylene dibromide (EDB) - All fuel tank pit and product pipe <br /> trench soil samples, except samples Al and A2 collected from <br /> the fuel tank pit, were also analyzed to determine levels of <br /> total petroleum hydrocarbons (TPH) as gasoline. Product pipe <br /> trench samples P1 through P3 and samples Al and A2 were also <br /> analyzed for TPH as diesel. <br /> r Soil samples 14O1, collected from beneath the waste oil tank, <br /> and P12, collected from beneath the waste oil remote fill <br /> line, were analyzed for BTX&E, halogenated volatile organics <br /> using EPA method 8010, total extractable petroleum <br /> thedrocar- <br /> bons (`.:EPH) , polychlorinated biphenyls (Pcg's) , <br /> - cadmium, chromium, lead and zinc. Sample WOl was also <br /> analyzed for TPH as gasoline. <br /> Analytical results of the initial oil samples <br /> land ll indicat- <br /> ed <br /> the fuel tank pit (samples Al, A2, .,or_TPH..as.dicat- <br /> ed non-detectable levels of TPH as gasoline esel <br /> '" which showed` <br /> sae <br /> as applicable for all samples, except Mpl .C2, <br /> TPH:.as ' gasesline at' 3,900 ppm .w h benzene at."7 <br /> Analyses of these six samples also indicated non-detectable <br /> levels of both total lead and EDB for all six samples. <br /> Analytical results of the soil samples col'_ected after <br /> additional excavation at sample point C2 (i.e. samples C2(26) , <br /> .....__..SW-N,...__.SW-S, _sw-E and SW W) indicate non-detectable levels of <br />