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I M i 30 January 2014 AGE Project No . 99-0682 Page 7 of 28 concentrations of 0. 17 mg/kg benzene (60 feet bsg ) , 4 . 0 mg/kg toluene (60 feet bsg ) , 1 . 9 mg/kg ethylbenzene (60 and 65 feet bsg) , and 11 . 7 mg/kg total xylenes (60 feet bsg ) .TAME was detected at depths of 60 feet, 65 feet and 70 feet bsg at concentrations of 0 : 11 mg/kg , 0 . 15 mg/kg and 0 .060 mg/kg , respectively. 1 , 2-DCA was detected at depths of 60 feet and 65 feet bsg at concentrations of 0. 034 mg/kg and 0 . 038 mg/kg , respectively. Historical soil , groundwater monitoring and grab groundwater analytical results are ✓summarized in Tables 1 through 4 . Boring logs documenting sample observations and well construction details are included in Appendix B . 3.0 , ADJACENT SITE INVESTIGATIONS One leaking UST investigation site is located directly north of the Stallworth Auto Sales site at 630 North California Street. The site is id ntified as the San Joaquin County Record Center (Geotracker site ID T10000004659)� After locating a vent pipe , which is typically associated with a historic UST, Condor Earth Technologies performed a limited subsurface investigation on 05 May 2011 to identify if petroleum hydrocarbon impact had occurred to soil as a result of a leaking UST. During the May 2011 investigation , four continuous core borings (GP1 through GP4) were advanced in the vicinity of the suspected UST to a depth of 30 feet bsg . During the investigation a total of fifteen samples were submitted for laboratory analysis . TPH-g was detected in seven of the fifteen samples at a maximum concentration of 8 , 100 mg/kg in boring GP2 Bt 15 feet bsg . Benzene was not reported in any of the samples collected during the investigation . However, toluene , ethylbenzene and total xylenes were detected in nine of fifteen samples at maximum concentrations of 48 mg/kg , 190 mg/kg and 780 mg/kg . On 29 March 2012, Condor Earth Technologies (CET) and Jim Thorpe Oil excavated and closed in-place one 375 gallon, single-walled UST. Prior to abandonment soil samples were collected from the western and eastern walls of the tank excavation . Constituents of concern were not reported in excavation samples collected during the investigation . The CET prepared , Underground Storage Tank Closure In-Place and Soil Sampling Report, dated 20 April 2012 , documents removal of the tank and the previous subsurface investigation at the site . 4.0. SOIL PROPERTIES / HYDROSTRATIGRAPHY Hydrogeologic or hydrostratigraphic units (HUs) are defined as a body of rock or sediment that has hydrogeologic characteristics (i . e , hydraulic conductivity, pore pressure, etc. ) that Advanced GcoEnvironmental, Inc.