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� f <br /> PUBLIC HEALTH SERVICESF.-dt3!/yj <br />' SAN JOAQUIV COUNTY Q <br /> ENVIRONMENTAL HEALTH DIVISION ,S r <br /> I <br />' Karen Furst, M D , M PH , Health Officer P <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 4�`FOR <br /> 209/468-5420 W <br /> DARN ROUSE ^ DEC <br />' EXXONIIOB L REFINING AND SUPPLY COMPANY r, <br /> PO BOY 4032 V` K <br />' CONCORD CA 94524-1032 [0 <br /> RE Former Exxon Retail Site 7-3942 SITE CODE 2231 " <br />' 4444 North Pershing Avenue <br /> Stockton, CA <br /> I <br /> San Joaquin County Puolic Health Services, Environmental 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 CaIiforrua State Water Resources Control Board <br /> (SWRCB) to conduct an UST corrective action 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 in <br /> January 1987 Over the course of the investigation, liquid-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 Brunnen(UVB), was installed and operated for <br /> • groundwater remediation and plume rrugration 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 constriction workers at the site or neighboring properties <br /> Current liquid-phase petroleum hydrocarbon and contaminant mass existing at this site does not warrant <br /> closure consideration Site closure will be granted only when cleanup is complete <br /> IETIC has stated the operation measurements of the L,NB 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 <br /> rr questions regarding this matter, please contact Harlin Knoll at(209) 468-3442 <br /> Karlin Knoll, Senior REHS Margare(, agono REHS' <br />' LOP/Stte Mitigation Unit Supervisor <br /> I cc CVRWQCB—Marty Hartzell <br /> SWRCB _Lori dale R@Celved <br /> ETIC-Reese Tisdale <br /> Bank of Stockton-Rick Correia <br />' DEC 8 <br /> EIC E.19meering inc. <br /> A Division of San Joaquin County Health Care 5es'�lLes <br />