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File No 20-3769-01 K L E IN FELDER November 21, 1994 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 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 was requested of Klemfelder, Inc by Mr Silva During the field portion of our soil and groundwater assessment, boring B-I was advanced to w� a depth of 45 5 feet below grade surface (bgs) Free groundwater was encountered at 45 5 �j instead of the published depth of 60 feet bgs Because of the photoionization detector (PID) readings present in the samples at that depth, the boring was abandoned immediately to avoid contaminant migration into groundwater The boring was abandoned by pumping it from the bottom up with neat cement The other three borings (B-2, B-3, and B-4) were advanced to depths of 59 5 feet, 60 feet, and 55 feet respectively. Groundwater monitoring wells MW-I, MW-2, and MW-3 were constructed in borings B-2, B-3, and B-4 respectively Generally the soil encountered beneath the site consisted of clays in the upper 5 feet, interbedded sandy clays and silty clays from approximately 5 to 30 feet bgs, sands from approximately 30 to 38 feet bgs, clays from approximately 39 to 47 feet bgs Silty sands from approximately 47 to 52 feet bgs, and clays from 50 feet to the bottom of our borings (approximately 60 feet bgs) Kleulfelder collected a total of twelve (12) soil samples from four soil borings Additionally, three (3) groundwater samples were obtained from monitoring wells installed within 3 of the 4 borings Petroleum hydrocarbons were detected in all twelve (12) of the soil samples analyzed However, only trace concentrations were present in the samples analyzed from the boring associated with Monitoring Well MW-3 (aka Bonng B-4) The hydrocarbons noted in all of the soil samples analyzed, can be generalized as primarily volatiles in the gasoline range with a high percentage of benzene, toluene, ethylbenzene, and xylenes (BTEX) Only minor concentrations of the heavier hydrocarbons (greater than C16 range) were present The compounds and concentrations present are indicative of a gasoline All of the groundwater samples obtained, were analyzed for the presence and concentration of benzene, toluene, ethylbenzene, total xylenes (BTEX), total petroleum hydrocarbons as referenced to gasoline (TPH-G), total petroleum hydrocarbons as referenced to kerosene (TPH- K), and total recoverable petroleum hydrocarbon(TRPH) All three groundwater samples ETH and IVC194 Copyright 1994 Klemfelder Inc Page 2 of 11