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KLEINFELDER File No 20-3769-01 January 3, 1995 DSS Engineering Contractors subsequently excavated approximately 550 cubic yards of hydrocarbon-affected soil from the UST excavation However,the limit of the affected soil was not able to be ascertained Soil was excavated to a depth of approximately 38 feet in some areas (approximately 7 feet above groundwater) Based on the presence of hydrocarbons near the groundwater surface and the need for better definition of the volume of hydrocarbon-affected soil, a soil and groundwater assessment proposal was requested by Mr Silva The results of Kleinfelder's Soil and Groundwater Assessment for the site detailed in our report dated November 11, 1994 showed that groundwater flowed in a east/northeast, ' direction, soil beneath the site contained gas constituents down to the groundwater level, ) and groundwater contained gas constituents at or above the maximum contaminant level FIELD ACTIVITIES water depth and checked for free product, and a All wells were sounded for ground p p , groundwater sample was collected from the monitoring well number 3 on December 16, 1994 The sample was subsequently and-analyzed for total petroleum hydrocarbons as gasoline (TPH-G) and benzene, toluene, ethylbenzene and xylenes (BTEX) In accordance with the approval of Mr Steve Sasson of the San Joaquin County Public Health Services Department, Environmental HealthDivision (PHS/EDH), groundwater samples were not obtained from wells MW-1 and MW-2 based on obvious gasoline odors in the groundwater from both wells The groundwater gradient was estimated to flow towards the north/northeast at 0 0485 ft/ft Groundwater Levels ' The depth to groundwater was measured in the three monitoring wells with an electric conductivity-based water level indicator on December 16, 1994 The water level probe was decontaminated in a trisodium phosphate (TSP) wash followed by a distilled water rinse, prior to use in each well Measurements were made to the surveyed mark on the , north rim of the monitonng well PVC casings' Measurenidnts were made to the nearest 0 01 foot The water level measurements were converted to elevations using the surveyed casing elevations The PVC casing elevations, depth to water measurements, and calculated groundwater surface elevations are presented in Table 1 ETH and WC/95 Page 2 of 5 ' Copyright 1995, Klernfelder, Inc