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: Les Calkins <br /> Page 2 <br /> The soil samples collected in July 1992 from the four soil borings evidenced diesel <br /> contamination as deep as 24 feet below ground surface (bgs) in the bottom of the tank <br /> Pit The sample;results also indicated that diesel contamination exists 10 feet bgs in all <br /> directions horizontally from the tank pit. It' s not know exactly how deep or how far the } <br /> contamination exists horizontally but appears to be clean at 25 feet bgs. <br /> As previously discussed, any diesel contamination over 100 parts per million diesel must <br /> be remediaied unless otherwise directed by Central Valley Regional Water Quality <br /> Control Board (CVRWQCB). 1 <br /> Since it is diesel contariiination, removal by fiver-excavation as proposed by your previous <br /> consultant is probably the quickest and mostcost effective method of remediation. After <br /> reffid%rdl of the diesel contaminated soil, confrrniation sampling of the bottom and side <br /> walls most be completed. <br /> i <br /> It was requested that the water in the excavation be pumped and discharged to the <br /> surrounding area:? This had been done previously. Please provide PHSXHD with <br /> information identifying the location of the previous water disposal, how much water is <br /> currently in the excavation, and where, on-site, you plan to dispose of this water. After <br /> receiving this information we will discuss the`water disposal to land with CVRWQCB. <br /> If you have any questions please contact Margaret Lagorio, Senior RENS, at <br /> (209) 468-3449. t <br /> Jogi Khanna, M , M.P.H. <br /> Health Offic <br /> j <br /> urie A: Cotulla, RENS, Program Manager I <br /> Environmental Health Division f <br /> f <br /> LAC/ML:lb <br /> c: Randall Yim <br /> Park Environmental <br /> r <br /> r <br /> l <br /> x <br />