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$ F _ <br /> 4J E: I kCyNr•1�:�T 'r'iL" f" <br /> r- E1- i - ETf�I <br /> X <br /> f <br /> IRDelta <br /> Environmental <br /> IConsultants, Inc. <br /> 3330 Data Drive <br /> t"ian,no Cor(1ova, CA 95570 <br /> 9151638.2085 <br /> FAX:9161638.8385 <br /> November 27, 1989 <br /> Mr. Robcrt 53gascr <br /> ,nvirorttnental Control Inspector <br /> City of Tracy <br /> 325 F-agt Tenth Street <br /> Tracy, Californiti 95:76 <br /> Subject: Ground Water T);scha r- for the Llndcrground <br /> Tank Peplacement Project <br /> Shell Service Station <br /> 3725 Tracy Boulevard, Tracy, Callforvia <br /> Delta Project No. 40-89-012 <br /> Dear Mr. 5ag3scr, <br /> This letter is to confirm tcicpbone conversations with you and Delta EnvironmMal Consultants, Inc. <br /> (Delta), concerning the dischurgo requirements for the ground w tar rernovcd du7ing tha un&rground <br /> gasoline storage tank rcplacc=nt proicct scheduled for the subject site. This lctter is inwndcd to <br /> replace my previous letter to you, dated September 27, 1.989. <br /> You have stated that water may be discharged to the on-sitt sanitary sewer lateral rather thein <br /> transported to the City of Trace (City), waste eater treatment plant. We estimate that a dewatcri.g <br /> f-low Cato of up to 30 gallons per mir:ute; (gpm) will be experioncc.d during the initial dew.,tering of tha <br /> site, but will dccrcasc to less than 3 &pm after several hours. <br /> In ordcr to determine whether the City's discharge: lirnit9 %v"ould be ext'edcd; i�uita ccllcctcd a grourld <br /> water sarnplc front down-gradic,nt monitoring wall MW-i, ' The sample was s`.nt to ;a State 0+ rtifitd <br /> laboratory ..,,or Inalyses of tht paramctc,rs listed in the City] Of Tracy Mucicipal Code (Table 1). The <br /> laboratory data sheets arc enclosed. Thi only pvramoter that exceeded the dis hargc limits was boron <br /> at a concentration of 4.9 parts per rr,1!ion-,, res we discussed over the phone, th-- City has agreed to <br /> exempt Sht:tl Oil Company from =.he bor6n effluent discharge: concentration limit for dewatering wc�rri <br /> during the tank replacc;rrmcnt project. <br /> As we previously explained, the: r.covcrcd waLV will he di.sch:truead irlio an abc>v^U-grouael Storage tank. <br /> passed through a treatment syrwrn. ;incl discharge into; additional �bovc-ground storage tanks. Delta will <br /> collect a water sample from each storagc tank (not to exceed N1,000 gallons of water). Mach simple <br /> will be analvzcd for benzene, toluene, -and xylenes (STX) to insure that the drinking wwcr standards <br /> astahlished t,y the State: of ('aliforria (~tate), ;end 1.1.5, Enviroitrftc tat ProLcc ton ,Ag..,ney (EPA) are not <br /> exceeded. Each ,;mple will also be: art:lyzcd for :otai oil and grczrw to in,%-Irc that the maximum <br /> concentration allowQd by the City S1tlrliC1PJl Cocas; is riot exenedcd. <br />