ARCHIVED REPORTS_XR0002170 - Laserfiche WebLink

Home Browse Search

^ e3 C A M B R I A service station is located to the south, and an active Valero service station is located to the southwest of the subject site The 7-Eleven site is an active environmental case overseen by the SJCEHD SECOR issued a site investigation report for the 7-Eleven site on September 30, 2004 SECOR reported that methyl tertiary butyl ether (MTBE) from the 7-Eleven site has migrated to the north and northwest, beneath the Shell site Previous Investigations January 2003 Well Installation As part of Shell's voluntary Groundwater Assessment Program (GRASP), KHM installed four groundwater monitoring wells (MW-1 through MW-4) at the subject site during January 2003 Groundwater samples collected from these wells contained MTBE at concentrations ranging from 0 69 to 730 parts per billion (ppb) After discovery of MTBE in groundwater beneath this site, Shell submitted an Unauthorized Release Report on March 25, 2003 iNovember 2004 Dispenser Replacements. Cambria collected native soil samples from beneath the former dispensers at depths of approximately 5 to 8 feet below grade (fbg) Total petroleum hydrocarbons as gasoline (TPHg) was detected in two soil samples at concentrations of 19 and 340 parts per million (ppm) Benzene was detected in two soil samples at concentrations of 0 61 and 0 011 ppm Total petroleum hydrocarbons as diesel (TPHd) was detected in two soil samples at concentrations of 11 and 33 ppm MTBE was detected in six soil samples at concentrations ranging from 0 OI8 to 0 44 ppm Tertiary butyl alcohol (TBA) was detected in five soil samples at concentrations ranging from 0 011 to 0 020 ppm No other fuel oxygenates, 1,2-dichloroethane, or ethylene dibromide were detected in soil samples collected from beneath the dispensers These activities were documented in Cambria' January 20, 2005 Dispenser Upgrade Sampling Report November 2004 Sensitive Receptor Survey, Cambria performed a sensitive receptor survey in the vicinity of the subject site In the Sensitive Receptor Survey Report and Site Investigation Work Plan submitted November 18, 2004, Cambria identified two domestic water wells approximately 1,300 feet southwest and 1,900 feet east of the site These wells are approximately 220 and 180 feet deep and screened from 195-220 and 157-177 fbg,respectively • Included in the November 18, 2004 report was the results of a well survey performed by SECOR for the 7-Eleven site Five private wells were identified by SECOR on Corral Hollow Road 1661 2