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tl �li <br /> • Additional Site Assessment Work Plan <br /> TOP FILLING STATION <br /> 101 South Wilson Way, Stockton, California <br /> 1.0. INTRODUCTION <br /> At the request of Mr Ken Endich of Top Filling Station,Advanced GeoEnvironmental, Inc (AGE) <br /> has prepared the enclosed additional site assessment work plan for 101 South Wilson Way in <br /> Stockton, California (the site) The work plan includes the advancement of three (3) cone <br /> penetrometer testing(CPT)soil borings for the collection of soil and groundwater data The location <br /> of the site is illustrated on Figure 1 A plan of the site is illustrated on Figure 2 <br /> This work plan provides a description of the scope of work and procedures to be used for CPT(Cone <br /> Penetrometer Testing) soil boring advancement, ground water sample collection and analysis, and <br /> boring abandonment The plan was prepared in accordance with California Regional Water Quality <br /> Control Board - Central Valley Region(RWQCB) guidelines for the investigation of underground <br /> storage tank (UST) sites <br /> i <br /> In letters dated 29 June 2005 and 31 August 2005, the San Joaquin County Environmental Health <br /> Department(EHD) requested that due to uncertainties toward the northeast, east and southeast and <br /> due to possible commingling with the 102 and/or 130 South Wilson Way ground water plumes, then <br /> . additional lateral investigation and characterization of the Top Filling Station ground water plume <br /> was warranted(Appendix B) Therefore,AGE is proposing to advance three CPT soil borings(CPT- <br /> 4, CPT-5 and CPT-6) off-site towards the east and southeast to further characterize the geological <br /> and hydro-geological framework off-site and to delineate the lateral extent of the Top Filling Station <br /> ground water plume CPT and ground water data collected from these borings will be used to <br /> address the issue of possible commingling of ground water plumes occurring between the 101 S <br /> Wilson Way plume and the adjacent 102 S Wilson way(102 site)and 130 S Wilson Way(130 site) <br /> ground water plumes <br /> 2.0. BACKGROUND <br /> The Top Filling Station was a full service gasoline dispensing facility circa 1926 to 1998 One 550- <br /> gallon UST and two 4,000-gallon gasoline USTs,dispensers and product piping were removed from <br /> the east section of the site in September 1998 It is AGE's understanding that two additional gasoline <br /> USTs were previously removed from the southeast section of the site in December 1988 <br /> 2 1 SITE DESCRIPTION AND USAGE <br /> The Top Filling Station site was previously owned by Mr Ed Endich and Mr Ken Endich for <br /> approximately 50 years till approximately 2003, the site is currently owned by Mr Paul Singh, and <br /> . is utilized primarily for vehicle storage, a warehouse building structure occupies the southeast and <br /> Advanced GeoEnvironmental,Inc <br />