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f <br /> Y..,?dvvard•Clyde Consultants <br /> San Joaquin Local Health District <br /> Mr. Ron Valinoti <br /> September 30, 1986 <br /> Page 2 <br /> former tank pit area by excavating down to approximately six to eight feet <br /> below grade or one to two feet below the water table. Two to three feet of <br /> soil will also be excavated beyond the sides of the tank pit. Grab samples <br /> will be taken periodically and examined for hydrocarbons (odor and visible <br /> staining) . Once all of the apparent contamination has been removed, one <br /> sample from the excavation bottom and one from two or three of the sides <br /> nearest the area of known contamination will be taken for analysis. Unless <br /> specified otherwise, these samples will be analyzed for total petroleum <br /> hydrocarbons only using EPA method 5020 or 5030. � �J <br /> A 24 to 48 hour turnaround time will be requested for sample analysis to <br /> facilitate a rapid evaluation of the contaminated soil removal . The <br /> excavation will remain open during the analysis period and any groundwater <br /> entering the hole will be monitored periodically for the presence of <br /> floating hydrocarbons (sheen or free product) . If the water and soil <br /> samples are found to be clean, the excavation will be filled in with clean <br /> material . If significant contamination is found in any of the soil <br /> samples, additional soil will be removed and the area resampled. Should <br /> the water sample contain significant levels of hydrocarbons, or if a layer <br /> of free product is detected on the water table, a four-inch PVC well will <br /> be installed in the excavation prior to backfilling and the Health District <br /> will be consulted to establish the best means of remediation. <br /> The proposed means of contaminated soil disposal is to transfer it to the <br /> back of the LOF facility and spread it over an open area to enhance <br /> creation and volatilization of the contaminants. This procedure has been <br /> implemented previously with approval from the Regional Water Quality <br /> Control Board in conjunction with a recent auto-clave oil spill at the <br /> Lathrop Facility. We do not believe there should be any objections to <br /> doing the same with this material as the level of contamination is much <br /> less and gasoline is considerably more volatile than auto-clave oil. <br /> Your expedience in reviewing and approving this plan will be greatly <br /> appreciated as LOF is most anxious to resolve this issue and complete the <br /> cleanup by early next week. If you have any questions or comments, please <br /> do not hesitate to call me at (415) 945-3000 or Mr. Ron Quick at LOF Glass <br /> (858-5151) . <br /> Sincerely, <br /> Martin Cramer <br /> Project Scientist <br /> MC:lnb <br /> SAND-LTR <br />