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PUBLIC HEALTH SERVICES o'Q�tN
<br /> SAN JOAQU IN COUNTY 4/1
<br /> Q f Ga
<br /> ENVIRONMENTAL HEALTH DIVISION
<br /> I Karen Furst, M.D , M.PH., Health Officer �
<br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 "t r r oRt{
<br /> 2091468-8420
<br /> ED RALSTON
<br /> ' TOSCO MARKETING COMPANY
<br /> 1280 LEAD HILL ROAD, SUITE 120
<br /> ROSEVILLE CA 95661
<br /> FEB 2 2 2000
<br /> RE UNOCAL,STA I ION #5886 SI I L CODE 1176
<br /> 2701 MARCH LANE
<br /> ,STOCKTON CA
<br /> ';an loaquin C oumy Public. Ht,alth Services. Fnvironntental Health Division(Pill; 11lD)has mviL%PtiLd tht,
<br /> ( orrc(,fnre Actton Pipit by Fnvironmental Resolution-, InLoi-p slated dated Decenibur 28, 19L)9 Pl IS/I'I It)
<br /> provide,; the following comiliL,rrts and dirt-(Al Vee
<br /> Artal}lical delta from the site listed abuve urnlirnls the piesence of pc.tro1L.un1 hydrelcatbons u1
<br /> groundwater A large mass of MTBF is present which may enllarrgLr hLriefic.1,11 use gioundwatc,r Purnp
<br /> tests from un-aplc cxlracl mn wells. suggest Ehat pktkitA hydraulic control of M111L M1111n,grstlnn may he
<br /> feasible Reduction of LtIntammant mass and mdurtimn cit plume inigratlon dt this site are critical
<br /> (.onlpn,hLn%ive and frequent assessment of }flume dynamics, receptor risk, dnd the effects of rertiLdiatnln
<br /> are strongly rec.u(nmt.ndLd by PHS/FII )
<br /> ' PUITIM F111d I rL,dt';y%te111
<br /> PHS'FI1f)h,,,s conditionally approved the start tip of the. rcmedtation system as hgLd helow
<br /> hs., proposal is considered an ruts.nm remedial action the dc,slgn proposed is not to he considered a Itotl
<br /> remediation strategy The plume is currently undefined however, in ac.c.midance with corrLLUVO ,ietiait
<br /> f e,ullt,ori interim remedial action can ucL.ur conourrelltly with dny plisse of corrective.aLl,on A C orrlA l"L
<br /> Acton Plan with cleanup ILVLlti complying with CCR, Title ?3, Division 3, Chapter 16, SLLtlon 2721(b)
<br /> 2726 and 2727 will be ri quirLd Following rite unplementarlon of 111J5, 1ntLnm remedial do Don At this Inn,
<br /> no clean tip goal is implied of approved A public participation notice will bc, posted at the tiro by
<br /> ' Pl IS/LI ID on H-bruary 22,2000
<br /> A limited radius of influence is expo. r-d at the disclydrj-vL rate proposed (5,000 galluns ptr week)
<br /> I'1 IS/L.i 1D rc,c.umrnends that lhc, rt.sponsrllle poly sunullanenudy ntoarlor, document, kind report the exttnl
<br /> Df plurnc capture and escapt. va,rttcally and laterally Modifications to the remediation system and plurnc
<br /> monitoring%ystenl may bt„ncceas.ary and tlrti4ly re5prntces by rms(A are imporlkint
<br /> Thc, actual composition of the, contaminant plurnc, from this unauthorized relt.au may not bc, known to
<br /> PHS/Fill) l,xarnplc.s are littpurrlic%and by-product~ in fuel c3c.lrvcrcd and drspLmed which rosy have been
<br /> M111,ssed to tllc sub%urface, including degradation C01npounds r)tsposal at the Iesoru Roden facility must
<br /> meet all local,sLaic and federal standards
<br /> ' A Iliv+arnn(if San Juaqutn(uuntV I It alth C 1rc SCCVILC%
<br /> r
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