ARCHIVED REPORTS XR0001822 - Laserfiche WebLink

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1.0 Background 1 Shaw Environmental, Inc (Shaw) has prepared this report on behalf of Don Rodgers (Rodgers) to document soil and groundwater assessment performed at 515 W Charter Way, Stockton, California (the site) The work was conducted to evaluate the concentrations and lateral and vertical extent of residual leaked hydrocarbon and evaluate remediation of the hydrocarbons within the saturated zone 1.1 Site Description ' The site is located in a mixed commercial and residential area within the City of Stockton, California It is on the northwest corner of the intersection of Lincoln Way and West Charter Way There are former or current retail service stations at each corner of the intersection Residual and dissolved hydrocarbons have been detected beneath each of those facilities and several or all have, are or will be undergoing remediation The subject property consists of two commercial buildings that in aggregate are approximately 4,310 square feet, and about 2,650 square feet of paved parking area There are two active businesses on the property a transmission repair shop and a drapery delivery business 1.2 Salient Environmental History The site was used as a retail service station and gasoline dispensing activities ceasing sometime in the 1950s according to information provided by the San Joaquin County Public Health Services (SJCPHS) It is believed that two or three underground storage tanks (USTs) were 1 present at the site Sanborn Maps° for the property Shaw an UST present in 1950, but not present in 1917 or 1972 A copy of the Sanborn Map report is shown in Appendix A Shaw and the SJCPHS have records indicating that Thorpe Oil of Lodi, California, removed one UST in February 1996 It is unknown when the other USTs and dispenser islands were removed There is little information available about the findings, extent of removal, or vadose zone residue when the UST systems were removed, residual hydrocarbons were reported in soil samples Environmental investigation of the site began when an UST was removed in 1996 Site characterization occurred during the next several years It was determined that there was both vadose zone and groundwater impact by residual hydrocarbons The impact was determined to extend to depths of at least 60 feet below grade surface (bgs), or approximately 40 feet beneath the water table Soil Vapor Extraction (SVE) was conducted from February 2000 until October 2004 and has reduced the concentrations and mass of gasoline in the unsaturated zone Groundwater monitoring and sampling continues to be performed on a quarterly basis SacDP N 1T0Cffti12022f Don A0dgMV0fs0R SPnng2006 SIA{August)dos 82306 1-1