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.,. 22 3 _ "r�-. � '� - ' - 4, NP R 9 UWA-4 s s.+ Chevron/S. E1 Dorado August 1990 6 r o Three groundwater-monitoring wells were installed, developed, and sampled. The soil and groundwater samples were analyzed for the presence of BTEX and TYH-as-gasoline. A o A reference point at the tap of each well casing on the - north side was surveyed for elevation above mean sea level (msl) to an established benchmark. SOIL EXCAVATION AND AERATION Kravation. Groundwater Technology, .Inc, undertook �t additional excavation work on January 29, and on February 9, 1990, to remove hydrocarbon-impacted soils for remedial treatment. All work steps were performed in accordance with the Groundwater. Technology Work Man dated November 1989, which had been approved by the SJCHSD. , 4 During the excavation, soil was removed to the practical i, limits of the equipment. Approximately 600 yd3 of soils were removed at the site from areas of the former underground storage , tank pit and the underground waste-oil fuel-storage tank pit. The final dimensions of the main fuel-storage tank pit excavation varied from approximately 30- to 80-feet in length in a north- South direction, 20-feet to 6-feet in width in an east-west direction, and 8-feet to 20-feet in depth (see Figure 3) . The final dimensions of the waste-oil pit were approximately 20-feet by 10-feet by 10-feet in depth. The soils west of, and beneath the approximate locations of the two previously existing southern Pump-is lands._were-.examined--using-a---backhoe.----Durin the excav�; -- - - - --- ation performed on January 20, 1990, two tanks were encmuntered to the west of the previous tank excavation whose existence had - not been documented. These tanks were removed on February 9, 1990. The locations and outlines of the final excavations are shown on Figure 3. .� GRO UND ATER TEc m-ou)GY,I%c.