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M IMP <br /> -40-Maw. <br /> R . . R <br /> s <br /> SOIL REMEDIATION PROPOSAL <br /> i <br /> I. Summary of Soil C:untamination Work Plan: <br /> In our Soil Contamination Work Plan (SCW) we proposed to <br /> excavate and remove all of the contaminated soil that would be <br /> found in and around the tank excavation. We were to do this <br /> IE by using a Photovac lOS50 portable gas chromatograph to detect <br /> hydrocarbons and find the outer boundaries of the contaminated <br /> plume and by taking soil samples from each wall of the <br /> excavation and sending them, using chain of custody, to a <br /> state certified laboratory for analysis to confirm the <br /> Photovacs findings and to ensure that all of the contaminated <br /> soil was removed from the ground. <br /> II. Report On Field Work: <br /> On January 16, 1990 Pratt consulting Company (PCC) performed <br /> the excavation, sample collecting, and analysis of the soil in <br /> the tank pit area. A temporary field laboratory was set up by <br /> Dr. Lew Schalit one half mile from the site in downtown Tracy <br /> s for purposes of running the Photovac 1OS50. Soil samples <br /> taken by PCC were curriered from the site by Dr. Croaker to <br /> i� <br /> :. the temporary field laboratory for analysis. PCC--e=avate&-a` <br /> 3 0 P bye 84,.E square:.asev,�approximaL-e•3 y--3.2:5 r down, from grade to <br /> just below water level. The uppea :6,��..o€ sa�ih .sho �tncssig[:s <br /> o crnrataEa imatian. The lower ,portion of soil did show varied <br /> levels of contamination as both diesel and gasoline. The <br /> contaminated soil was placed on plastic sheeting and covered. <br /> Final soil samples (N-1, S-1, E-1, and W-1) were taken from <br /> each wall of the excavation, just above the water table, as <br /> directed by Mr. Greg LyonN from San Joaquin county <br /> Environmental Health and one water sample (GW-1) was obtained <br /> from the water that had recharged into the excavation at <br /> approximately 12.5' below grade. These samples were taken to <br /> a state certified laboratory, using chain of custody, and <br /> analyzed for presents of Total Petroleum Hydrocarbons as <br /> Diesel and Gasoline and BTX&E. <br /> The tank excavation was backfilled with clean material and the <br /> R location of the excavation surveyed to help us relocate the <br /> area if the laboratory results did not come back clean. E <br /> 111. Laboratory Results: i <br /> Laboratory .results confirmed tl:e Photovacs findings of no y <br /> detection (ND) for, all four soil samples, however, detectable <br /> y � r <br />