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.j <br /> ENVIRONMENTAL HEALTH-bEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> unit S�upervtsors <br /> Danna$:Heran,"t2.E. 3. : Carl Bon an,R E.H.S: <br /> '04 East Weber Avenue, Third Floor � <br /> Director Mike Huggins,R.E:IU-R.( I <br /> At Olsen,R.E.I=I.S. Stockton., California ,x 5202-2708 Douglas. �. ilson R E.H S. <br /> Program Manager- Telephone: (2{x 9) 468-•3420 Margaret Lagori©,R E.H.S. <br /> Laurie A.Cotulla,R.E.R.S; Robert McClellon,R.&H.S.. <br /> Program Manager FAX. (2C}9} 4-0138 <br /> Mark Barcell4s,It.E,H.S: <br /> ` IF"I. <br /> JQE TOSTE JR AUGU�J4 AUG 0 9 2004 <br /> JT STORAGE <br /> 2480 T€)STE ROAD <br /> "TRACY CA 55:37.6: <br /> R8 Curtiss Pontlac-Cadillac SITE COODI 1:07 <br /> 2460.76ste Road <br /> 'racy CA 05376. <br /> Sart Joaquin County Environmental l-iealth'Department(EJC/ENQ) has reviewed <br /> "Excavation and Sampling f eport-►ormer Gasoline UST" (Report) dated <br /> January , :2 04 along with the Updated fiures and tables dated June 23,.2 <br /> subMid d on your behalf by Advanced GooEnvironmen#al, inc,.(AGE), and has the <br /> follow ng:ccammbrits. <br /> Site remediation by over:excavatiori Of ii=ntaminated soil was cond"ucfed st your site <br /> dur ing:May:2003.The.Report presents the details of the;over-excavation; and the <br /> destruction:and reinstallation of mart tonng wells MWAA, MW-1:8, MVti/-4 and MW4. <br /> AppWX(Mately '[AO cubic yards of petroleum hydrocarbon contaMina..ted.l.$..fail was <br /> reMoved during the remediation. The Report estimates that approxirrmately 30 gallons <br /> of total petroleum hydrocarbons as gasoline; or 83% of the calculated soil contathinant <br /> rriase at thio site,.was removed during the ever-excavation. <br /> :The:report recommends implementing the rnoiiitoring provtsicrns of the approved <br /> Remedial Action (RAP),which proposed monitored natural attenuation as the mast <br /> feasible remi iatip.n alternative for the groundwater contamination remaining.st this site: <br /> Routine quarterly groundwater monitoring`"and sampling is to:continwe at the site, and <br /> shs uli� include measurement or analysis of the following natural attenuation.para`rneters:. <br /> q� methane`,`ferrrsus r0n'�sulfatKnitrate dissolved manganese, <br /> alkalinity, hardness, pH e and rrpdd g t t . In addition,the <br /> Wisconsin department of Natural Resources guidance document, "Guidance ++C7n Natuna! <br /> ch <br /> Attenuation.Far Petroleum Releases, dated March 2003, whican be foundoft-the <br /> Federal EPA website, recommends:determining the hydraulic:conductivity for the <br /> primary contaminant flew paths (PGFP), horizontal and vertical gradient, effective <br /> por6sity of the,PUP's, bulk density of aquifer solids, organic carbon/water pard ionirtig <br /> coefficient.(Ka)`for each contaminant, the organic.carbon content (f,,)for the aquifer <br /> along the PCFP's, location and horizontal and vertical dimensions of the contaminant. <br /> source area,an <br /> d estimates of contaminant mass in the source, area including the mass'. <br /> in soil:in 0th the vadose zone (Ms) and in the saturated zone (Mo)'material and <br /> dissolved;phase (Mgw), <br />