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1la lnul CreeKCO Pringle AI6w <br /> . Woodwc#'d•C7yde Consultants <br /> . CA C�9 9459b 4 <br /> 415-945-30c0 <br /> April 18, 1986 <br /> 86P2168 <br /> Mr. Mike So <br /> LOF Glass <br /> 500 East Louise <br /> Lathrop, California 95330 <br /> Dear Mr. So: <br /> Woodward—Clyde Consultants is pleased to present this proposal for the <br /> investigation and remediation of the recent autoclave oil spill at the <br /> LOF facility in Lathrop, California. This document was prepared in <br /> response to a request from Mr. Ron Quick on April 2, 1986. <br /> Review of the information provided by Mr. Quick indicates that the <br /> majority of the spilled oil has been recovered although excavations in <br /> the spill area suggest that of contamination in excess of what would be <br /> expected remains below the tank farm area. Previous operating practices <br /> may have resulted in chronic releases of small amounts of oil within the <br /> tank area over a number of years. This would account for the amount of <br /> contamimation present in the substrate. <br /> Based on our understanding of site conditions, the primary objectives of <br /> the proposal investigation will be to estimate the depth and lateral <br /> extent of subsurface soil contamination as well as the potential for <br /> material floating on the groundwater. We propose to achieve both <br /> objectives by installing four to six borings in the area around and <br /> downgradient of the tank farm. Soil samples will be taken from all <br /> borings and laboratory analyzed for total petroleum hydrocarbons. <br /> Sampling intervals for the three borings adjacent to the tank farm will <br /> be from 3 to 4.5 ft, 6 to 7.5 ft, and 9 to 10.5 ft. The water table is <br /> anticipated to be situated between 9 and 10 ft below grade. The other <br /> downgradient borings will be sampled at 9 to 10.5 ft only as only oil <br /> floating on the water table is expected to exist in these areas if it <br /> exists at all . Grab samples will also be taken from the bottom of the <br /> existing excavation within the bermed area to evaluate existing levels of <br /> soil contamination. <br /> All borings will be completed as groundwater monitoring wells. The <br /> proposed locations are shown in Figure 1 . Borings 1 , 2 and 3 will be <br /> situated just outside the bermed area to evaluate both the lateral and <br /> vertical extent of sail contamination and the presence of oil on the <br /> groundwater. Borings 2 and 3 are located in the general downgradient <br /> direction while Boring 1 is upgradient to ensure that previous pumping <br /> from the LOF process water well did not reverse the gradient and cause <br /> contaminant migration in that direction. Borings 4, 5, and 6 are located <br /> farther down gradient to check for oil migrating on the water table. <br /> Borings 5 and 6 are optional and will only be drilled if Boring 4 is <br /> found to be contaminated. <br /> nsullino Enc.neers Geologists <br /> enc? Emironmenrai Sciennsis .-i <br /> Cffices in Otner Principal Cil es 1W <br />