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— s n„ S [EC ® R • Conceptual Site Model March 24, 2004 Page 18 s was detected in groundwater at concentrations ranging from 688 pg/L (CPT-2 at 38 feet bgs) to 439,000 pg/L (CPT-4 at 47 feet bgs) Benzene was detected in groundwater at concentrations ranging from 1 52 pglL (CPT-2 at 30 feet bgs) to 13,200 pglL (CP74 at 47 feet bgs) MtBE was detected in groundwater at concentrations ranging from 29 4 pg/L (CPT4 at 47 feet bgs) and 842 pg/L (CPT-1 at 50 feet bgs) These activities are summarized in Cambria's July 20, 2000 Site Investigation Report P yl 9 In June of 2002, Cambria advanced seven soil borings (CPT-5 through CPT-11 to access the extent of hydrocarbons in soil and groundwater beneath the site Soil samples collected from CPT-5 reported TPHg, benzene and MtBE below laboratory reporting limits TPHg was detected in groundwater at concentrations ranging from 68 pg/L ( CPT-11 at 49 feet bgs) to 4,400 pg/L (CPT-11 at 65 feet bgs) Benzene was detected in groundwater at concentrations ranging from 0 73 pg/L (CPT-11 at 81 feet bgs) to 3,200 pg/L ( CPT-11 at 65 feet bgs) MtBE was detected in groundwater at concentrations ranging from 0 67 pg/L (CPT-6 and CPT-11 at 49 and 81 feet, respectively) to 36 pg/L (CPT11 at 65 feet) These activities are summarized in Cambria's January 21, 2003 Site Investigation Report Excerpts from the Shell service station reports are presented in Appendix N T-11 7.0 POTENTIAL GROUNDWATER RECEPTORS 1 A database search was conducted by EDR, on behalf of SECOR, to determine potential receptors of impacts from groundwater A copy of the report entitled EDR GeoCheckO- Physical Setting Source ; Addendum, dated January 27, 2004, is included as Appendix A Five water supply wells were identified down gradient of the site within a 1-mile radius of the site �t • EDR Well ID CA3900732 is located approximately 114 to 112-mile east-northeast and down gradient from the site This well is listed as a water well, • EDR Well ID 23104 is located approximately 1/4 to 112-mile northeast and down gradient from the site This well is listed as a water well, • EDR Well ID 219 is located approximately 114 to 112-mile northeast and down gradient from t the site This well is listed as a water well, k • EDR Well ID 234 is located approximately 112 to 1-mile east-southeast down and cross gradient from the site This well is listed as a water well, • EDR Well ID 216 is located approximately 112 to 1-mile east-southeast down and cross gradient from the site This well is listed as a water well 11Chevron1920331REPORTSICSMICSM 92033 (REV B) doc x