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i09/87/2000 16.34 2094583433 FIFTH FLOOR PAGE ` 82 <br /> PUBLIC H—FALTH SERVICES ,oul <br /> co <br /> . SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL. HEALTH DIVISION <br /> Karen Furst, M-D., MX.H., Health Officer <br /> 304 East Weber Avenue, Third Floox • Stockton, CA 95202 <br /> 2(19/468-3420 <br /> FRANK GU]=NTA <br /> GUZNTA ENTERPRISES <br /> 305 N UNION ROAD <br /> MANTECA CA 95377 <br /> RE GROG"WATER REM EDIATION SITE:CODE. 1426 <br /> SYSTEAT COMMENT LETTER <br /> P AN S EXXON <br /> 2472 NY YOSEMI'T'E AVE <br /> MAItiTECA <br />' San Joaquin County Public Health Services En%ironmcntal Health DiNision(PIIS/EHD)has reviewed the <br /> Workplan or rhe lnsrallarion o ren Infenm Remediart n S crem by Aqua Science Engineers(ASE), <br /> Incorporated dated September S,2000 PHSMHD provides the following cominents and directives <br />' Anal3lical data from the site listed above confirms:the presence of petroleum hydrocarbons rri groundwater <br /> and drinking water wells north of the subject site A large rnass of MTBE and other fuel hydrocarbons are <br /> present wluch may endanger beneficial use groundwater Pump tests from on-site extraction wells suggest <br />�. that partial hydratthc control of contaminant migration ruay be feasible Reduction of contartunatit mass and <br /> reduction of plume rrugration at this site arc critical as rnurucipal and domestic supply wells arc in close <br /> proximity Comprehensive and frequent assessment of phone dyriaitucs, receptor risk„ and the effects of <br /> remediation arc strongly reconmmcndcd by PHSIEHD <br /> Emp—and Treat System <br /> PHS(EHD has conditionally approved the start up of the intenm remediation system as listed below <br />' The proposal is considered an mtcmn rcrmedtal action, the design proposed is not to be considered a final <br /> remediation strategy The plumt is currently undefined, bowever, in accordance with corrective action <br />' regulation mterim,remedial action can occur eoncurrmtly with any phase of corrcctxve action. A Corrective <br /> Action Plan with cleanup levels complying with CCR, Title 23, Division 3, Chapter 16, Section 2721(b), <br /> 2726 and 2727 will be required following the implementation of this interim remedial action At this tune <br /> no clean up goal is implied or approved A public participation nonce will be posted at the site by <br />' PHS/EHI)on September 11,2000 <br /> A hnuted radius of iat]uctice has been docu=ntcd at the discharge rate proposed l'HSIEHD recommends <br /> that the responsible party stmiultancously monitor, document, and report the extent of plurne capture and <br />' escape vertically and laterally Modifications to the rcmediat3on system and plume monitoring system rimy <br /> be necessary and timely responses by the responsible party and consultant are nuporrant <br />' The actual composition of the contaminant plume from this unauthorized release may not be known to <br /> PHS/EHD Examples are impurines and by-products m fuel delivered and dispensed which may have been <br /> released to the subsurface including d oradatton compounds. The effluent from the on-site treatment plant <br />' A Division of San Joaquin County Health Cara Servjesa <br /> 1 <br />