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REMEDIATION CONFIRMATION SAMPLING RESULTS AND CLOSURE RECOMMENDATION REPORT (Mardi 1994 Revision) 9W West Hammer Lana StodRan Gafrfnmla ' 1.0 INTRODUCTION This report, a revision of one dated September 9, 1993, documents the results of soil remediation confirmation sampling performed on June 3, 1993, and groundwater monitoring conducted on June 21 , 1993, by Aegis Environmental, A Fugro Company (Aegis), at the former Exxon Company, U S A (Exxon), service station located at 909 West Hammer Lane in Stockton, California (Figure 1) Three soil borings, SB-8 through SB-10 (Figure 2), were drilled to assess the presence of petroleum hydrocarbons in the soil following approximately one year of soil vapor extraction The groundwater monitoring included collection of depth-to-groundwater measurements and groundwater samples from five wells, MW-1, MW-2, MW-5, MW-6, and MW-8, on site (Figure 2) This report also includes a detailed site history and historical soil and groundwater sampling results, from information supplied to Aegis by Exxon and previous consultants Appendix D contains a letter from the San Joaquin County Public Health Services ' Department, Environmental Health Division (PHSIEHD), requesting additional site information, which is included in this revised report Based on the sampling results and ' site history, justification for site closure is presented 2 0 SITE DESCRIPTION The site is a vacant lot at the northwest corner of the intersection of Hammer Lane and Lower Sacramento Road, in a commercial area of Stockton (Figure 1) The site is a former Exxon service station that retailed gasoline The station's former facilities included a service building, three dispenser islands, and four underground storage tanks (UST) with associated piping The UST were located at the south central portion of the site The layout of the former service station's surface and subsurface structures is shown in Figure 2 3 0 BACKGROUND The former Exxon service station is currently vacant and no structures remain The UST, service building, and fuel dispensers were removed in February 1986, after the fuel lines failed a tightness test in November 1985 The piping was removed in August 1990 ' 0 In January 1986, Groundwater Technology, Inc (GTI) drilled and sampled soil borings SB-1 through S13-4 and monitoring wells MW-1 and MW-2, apparently to ' assess subsurface conditions prior to UST removal Soil samples were screened for petroleum hydrocarbons using a photoionization detector Petroleum hydrocarbons were apparently not detected and no samples were submitted for ' laboratory analysis The well logs and construction details are included in . Appendix H ' 93 005C QMR 1