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l` <br /> 3 <br /> PUBLIC HEALTH SERVICES CUIN <br />' SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION L:'?�' : <br /> Karen Furst, M D., M P.H , Health Officer orP <br />' 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 2091468-3420 <br /> DAMN ROUSE DEC <br /> EXXONINIOBIL REFINING AND SUPPLY COMPA1`-Y � <br /> PO BOX 4032 ..,.�� <br /> CONCORD CA 94524-4032 <br />' O _ <br /> RE Former Exxon Retail Site 7-3942 SITE CODE 2231 - <br /> 4444 North Pershing Avenue <br />' Stockton, CA <br /> San.ioaquin County Public Health Services, Enviruntnental Health Division(PHS/EHD) is the lead agency <br />' providing the oversight of the investigation and cleanup of releases from underground storage tanks (UST) <br /> within San Joaquin County PHS/EHD has a contract with California State Water Resources Control Board <br /> (SWRCB) to conduct an UST corrective act-ton program. <br />' Gasoline contamination was documented at the time of UST removals in July 1986 at the above referenced <br /> site An Unauthorized Release Report was filed in September 1986 and a groundwater investigation began m <br /> January 1987 Over the course of the investigation, Iiquid-phase petroleum hydrocarbons have been evidenced <br /> in several on site wells The site was placed in the Local Oversight Program in April 1989 Soil and <br /> groundwater remediation began in 1994 utilizing air sparging in conjunction with vapor extraction In 1996 a <br /> vacuum vaporized well system, Underdruck Verdampfer Brunet(UVB), was installed and operated for <br /> groundwater remediation and plume migration control <br /> On September 12, 2000,PHS/EHD met with you and your consultant(ETIC) to review site status and <br /> proposed work Discussion was focused on your interest in conducting a Risk Assessment for this site and <br /> discontinuing operation of the UVB system <br /> On November 2, 2000,PHS/EHD received a letter from ETIC PHS/EHD does not agree with the first^ <br /> possible direction, which is stated in the letter Site closure will not be considered even if the risk assessment <br /> exhibits no exposure/impact to future residents and construction workers at the site or neighboring properties <br /> m <br /> Current liquid-phase petroleum hydrocarbon and contarnant mass existing at this site does not warrant <br /> closure consideration Site closure will be granted only when cleanup is complete <br /> ETIC has stated the operation measurements of the LT3 system show that it has reached the asymptotic stage <br /> of operation and has not achieved a significant migration control and requests it be shut down You may <br /> discontinue operation of the UVB system,but you must evaluate other remedial alternatives for groundwater <br /> cleanup <br /> If you have any further questions questions regarding this matter,please contact Harlin Knoll at(209)468-3442 <br /> Harlin Knoll Senior REHS11 ` <br /> Margaref�lLagorio REH <br /> LOP/Site Mitigation Unit Supervisor <br /> cc CVRWQCB—Marty Hartzell <br /> SWRCB —Lon Casias <br /> ETIC-Reese Tisdale Received <br /> Bank of Stockton-Rick Correia <br /> DEC 8 <br /> EAG Engineeratag enc. <br /> Di%kion of San Joaquin County Health Care Services <br />