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04/12/96 13:43 '0510 842 8252 CHEVRON PRODUCTS <br />0 0 <br />2652 (c)(6) see attached unauthorized release report All UST's and a&wciatrd piping were removed on <br />April 10, 1996 and transported under hazardous waste manitest: to Pichmond, <br />California where each wn propefly destroyed by Erickson, Incorporated. <br />(7) Conwtive action taken to date includes the removal of backfill sod suspected to be <br />MEP M �ntrmm <br />Based on field observations, it is 041eCtCd. that overexcavation will be perfbimed to remove <br />remaining 1ydr1carbon4n1pacted sail from within the used oil tankpit area. The fino <br />decision to Perform this work will be based on analytical results of samples collected from <br />tI- used oil it on ADril 10 1995. Anv mi"' <br />TIMIMMMOSM Wo i it, <br />A soil and groundwater investigation was perfDrmod at the wbject site on July 25 and 26, <br />1995 by Chevron's consultant, Pacc Environmental Group. Four soil. borings were: drilled <br />and vivre converted to groundwater monitoring wells. No petroleum hydrocarbons were <br />detected in any of the sod samples, A detection of 6.0 ppb tetrachloethene was measured at <br />well MW -3 9W <br />��nt of the used oil tank <br />i 10) Igo) Aw �'� <br />A fin -al report documenting all UST removal activities, excavations, soil stockpile <br />SeMoes within 45 days of completing such activities. <br />Future site investigation will include groundwater monitoring to assess groundwater <br />conditions beneath the site throughout a complete hydrologDue to the anticipated <br />destruction of at least one groundwater monitoring wen, it is expected that at least one <br />replacement well will be &Med <br />"8) Ile method of cleanup implemented to date has been limted to the removal Of hydrocarbon - <br />impacted backfil that was associated with the former UST pits and fuel dispenser areas, <br />Further cleanup activities will be determined upon review of pending soil analytical results. <br />Once the need for furdwr cleanup has been determined, limiled sod excavation and disposal <br />will be implemented according to Touchstone's cmrecthve action plan. The results of any soil <br />excavaAr n will be included in Touchstorie's UST removal report that will be submitted <br />within forty five days upon completion of all associatedfield work. <br />(9) A total of approximately 480 cubic yards of soil were stockpiled at die subject site. 'rhese <br />soils were generated during the removal of all UST's and piping. All stockpiled soil was <br />sampled by Touchstone Developments according to protocol established by BFI <br />Landfill in Livermore, California. Any additiozal sod stockpiled as a result of ovez-excavation <br />will be handled similarly. Copies of all soil disposal mani&sts will be subadtted as soon as <br />they are available. <br />(10) All new underground storage, Mnks and lines are being installed under permit by San <br />Joaquin County Public Health SeMces. <br />(11) Fuhm rcleases will be prevented through the installation of underground storage and <br />dispensing equipment that meets or exceeds all applicable regulations. <br />M40WO 4 4.,1T .. *I RMIMM <br />MW <br />