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i M w Additional Site Assessment Work Plan TOP FILLING STATION 101 South Wilson Way, Stockton, California lA. INTRODUCTION At the request of Mr Ken Endich of Top Filling Station,Advanced GeoEnvironmental,Inc (AGE) has prepared the enclosed additional site assessment work plan for 101 South Wilson Way in Stockton,California(the site) The work plan Includes the advancement of four(4)cone penetration test (CPT) soil borings for the collection of soil and ground water data The location of the site is Illustrated on Figure 1 A plan of the site is illustrated on Figure 2 This work plan provides a description of the scope of work and procedures to be used for CPT soil boring advancement, ground water sample collection and analysis, and boring abandonment The plan was prepared in accordance with California Regional Water Quality Control Board - Central Valley Region(RWQCB)guidelines for the investigation of underground storage tank(UST)sites In letters dated 29 June 2005 and 31 August 2005, the San Joaquin County Environmental Health Department(EHD)requested that due to uncertainties toward the northeast, east and southeast and due to possible commingling with the 102 and/or 130 South Wilson Way ground water plumes, then additional lateral investigation and characterization of the Top Filling Station ground water plume was warranted (Appendix A) Therefore, AGE is proposing to advance four CPT soil borings (CPT-4, CPT-5, CPT-6 and CPT-7) off-site towards the east and southeast to further characterize the geological and hydro-geological framework off-site and to delineate the lateral extent of the Top Filling Station ground water plume CPT and ground water data collected from these borings will be used to address the issue ofpossible commingling of ground water plumes occurring between the 101 S Wilson Way plume and the adjacent 102 S Wilson way(102 site) and 130 S Wilson Way (130 site) groundwater plumes Z.O. BACKGROUND The Top Filling Station was a full service gasoline dispensing facility circa 1926 to 1998 One 550- gallon UST and two 4,000-gallon gasoline USTs,dispensers and product piping were removed from the east section of the site in September 1998 It is AGE's understanding that two additional gasoline USTs were previously removed from the southeast section of the site in December 1988 21 SITE DESCRIPTION AND USAGE The Top Filling Station site was previously owned by Mr Ed Endich and Mr Ken Endich for approximately 50 years till approximately 2003, the site is currently owned by Mr Paul Singh, and • is utilized primarily for vehicle storage, a warehouse building structure occupies the southeast and south sections of the site, soil and ground water remediation equipment occupy the southwest Advanced GeoEnvironmentsl,Inc.