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S E C 0 R r . Conceptual Site Model March 24, 2004 Page 22 • Location of West Charter Way and South Lincoln Street immediately down and cross gradient and, Based on a site visit underground utilities appear to be located immediately down and E cross gradient Data from previous site assessment activities dotqt not indicate that lateral definition will be obtained from borings advanced north of West Charter Way or east of South Lincoln Street Primary sources located north of West Charter Way and east of South Lincoln Street renders detections of petroleum hydrocarbons collected in these locations suspect with respect to their source } Site assessment activities will be conducted within and along the property boundary to target =' unsaturated soil from approximately 8 feet bgs to 21 feet bgs or first encountered groundwater A grab groundwater sample will be collected from each of the borings This will be accomplished by advancing eight soil borings (SB-9 through SB-16) to approximately 30 feet bgs General locations of the eight soil boring locations are presented on Figure 2 Three of these borings will be converted to monitoring wells Selected soil samples collected in the vicinity of the former waste oil tank will be submitted to a California state certified laboratory, and analyzed for the presence of TPHg, TPHd, ° total petroleum hydrocarbons as motor oil (TPHmo), BTEX, MtBE, TBA, DIPS, EtBE, TAME, 1,2- DCA, and EDB and Title 22 metals Soil samples collected from borings located on the eastern and northern property boundaries will be submitted to a California state certified laboratory, and analyzed • for the presence of TPHg, BTEX, and MtBE Based on the results of access agreements for the City of Stockton's Municipal yard and motel located to the south and west, respectively, additional site assessment work will be conducted in conjunction with the work proposed in this section Additional site assessment work consists of , advancing one soil boring, each, on the City of Stockton and motel properties Based on results from field screening the soil borings will be advanced to a depth appropriate to vertically define h petroleum hydrocarbon impact Soil samples collected from borings will be submitted to a California state certified laboratory, and analyzed for the presence of TPHmo, TPHd,TPHg, BTEX, and MtBE Samples submitted for chemical analysis will be analyzed per the following protocol • TPHg, TPHd, and TPHmo using modified EPA Method 8015, • BTEX by EPA Method 82606, • MtBE, TAME, TBA, 1,2-DCA, EDB, DIPS, and EtBE by EPA Method 82606, • Title 22 metal by EPA Method 6010 A summary of field and laboratory procedures is presented in Appendix O r • 11Chevron1920331REPORTSICSMICSM 92033(REV B)doc s