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� . P, Knowles Gas Station 202/799-5027.02 July 21, 1988 Fa The station formerly dispensed diesel fuel in addition to �.' regular, unleaded and premium unleaded gasoline. The fuels were stored on-site in six underground storage tanks, four 6,000- gallon and two 12,000-gallon tanks. The four 6,000-gallon tanks j have been in use for the past 27 years, while the two 12,000- gallon tanks have only been in service for the last 7 years. There are no known septic tanks in the area, and all underground - utilities have been marked in the street by the appropriate utility company. On March 17, 1988, all buildings, pump islands, underground { fuel storage tanks and product lines wereremoved (see Figure 2, }_ I Site Plan) . During the tank removal procedure, the SJLHD sinspected the excavation and determined that hydrocarbon con- tamination was evident. However, according to the site operator t Mr. Knowles, inventory records indicate nor product discrepancies have occurred since the station began operation. Soil samples t - a were collected. from the tank excavation at the site, and sub- sequent laboratory analyses prompted the SJLHD to request an initial groundwater Investigation. F 7 r u Subsequently, soil borings (SB) were drilled and monitoring ( wells (MW) were installed on-site on September 24, 1987 (see Figure 2' and Appendix 1, Drill Logs) . ( ' Pp . Monitoring wells MW-1 e. through MW-3 were drilled to total depths of 65 feet, with MW-1 ' r ~� and. MW-2 screened from 35 feet below surface to total depth. MW_ 3 -was screened from 25 to 55 feet below surface due to drilling - --difficulties- which- hampered the well aom letion p process. Resents ; of laboratory analyses of the associated soil and groundwater 1 samples are summarized in the following .sections and presented in a Appendix 11. r � 0