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ii <br /> San Joaqu in Count DIRECTOR ! <br /> y Donna Heran,REHS <br /> oPQu'" Environmental Health Department <br /> �,. i �� -•p la ASSISTANT DIRECTOR <br /> r,{ -- -� 600 East Main'Street Laurie Cotulia,REHS <br /> •°�€` '� " < Stockton, California 95202-3029r <br /> PROGRAM COORDINATORS j <br /> Carl Borgman,RENS <br /> Mike Huggins,REHS,RD; <br /> Website: www.sjgov.org/ehd Margaret Lagorio,REHS <br /> Qct F°�a Phone: (209) 468-3420 Robert McClellon,REHS <br /> Fax: (209) 464-0138 Jeff Carruesco, REHS,RDI <br /> .December 3,"2008 Kasey Foley,REHS <br /> Mr. Sergio Morescalchi <br /> Atlantic Riobheld Company � <br /> Post Office Box 1257 DEC 0 4 200$ <br /> San Ramon. California 94583 <br /> By <br /> Subject: ARCO Service Station No. 2:186 <br /> 3212 North,California Street <br /> Stockton, California 94570 <br /> The Sam loacluil) County Environmental :Health Department (EFF D) has reviewed 1'Voj-h <br /> Plan for Vrr���� .Pjobe.Uestrrrclrorr, ff"ell.Destructiorr, and 11/el1lnstallialion dated October <br /> 14, 2008, prepared by Stantec Consultinu Corporation (Statliec) 0.11 your behalf for the <br /> above-referencecl 'sitc. 7The work plan includes destroying soil vapor probes VP-1, Vl'-2, <br /> and V.P-3, and groundwater monitoring wells :MW-'1 and MW-3, and :installing two <br /> monitoring welds (iV31]4R and jM W-3R) screened across the first gromic.Iwater bcat-113C, <br /> zone, and one Monitoring well (MW-:1D) screened across a deep groundwater bearitlg <br /> zone. The work Plan wais submitted in respbusc to the EH:D directive by ictter dated <br /> August 22, 2008. <br /> Stantec Proposes to destroy soil vapor probes VP-1 throilgh VP-3 by Pressure groutin4" <br /> 111e borings Front total depth of six feet below surfacc grade (bsg) to ground surface using <br /> neat cement. Instead, the E:H.D betievos the three vapor probes should be over drilled to <br /> total depth and grouted using a trenlie pipe. The :E]-1D concluded this because the casing <br /> diameter'for each sol.] vapor probe is only one-cluart.er inch in dinuic;tcr and dors, lira leave <br /> a .large enough opening :for the - rout to penetrate to a depth of six feet, even under <br /> pressure. <br /> Stantec proposes to destroy monitoring wells iVIW-:1 tinct 'MW-3 by removing the well <br /> contents by over drilling the borcholes to total depth, then backfilling the boreholes to <br /> tht•ee feet bsg with neat cement using a tremie-p.iPe system, forming a Inushroo111 grout <br /> grout( <br /> seal, The LH.D approves the proposed method for the (ICStf-LICtioll of'.MW-1 <br /> and JM W-3. <br /> Stantec proposes to advance shallow wells NMW�-1R and MW-:i:R to approx.imate]y fifty- <br /> five Feet bsg using eight-inch diameter hollow=stem auget:s wlt.i.lc collecting soil samples <br /> at live-foot intervals for l:ithological evaluation: Soil samples wi11 be Screened in the field <br />