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14E -'DEPARTMENT <br /> EN"RONMENTAL <br />,. AaU1M <br /> SNJOAQUIN COUNTY Unit Supervisors <br /> A <br /> Carl Borgman,R.E.H.S- <br /> Ileran,PLL"* Third Floor <br /> Ponna V 104:East Weber Avenue. Huggins,RE.H.S.,R-Dil. <br /> Mike <br /> Director California5202o2708 Douglas W,Wilson,R.&H.S. <br /> Al Olsen g.E.Hsi Stockton, Margaret Lagorio,REES, <br /> a-W Program Manager Telephone: <br /> (209)468-3420 <br /> 4&ILS <br /> Laurie A.Cotulla,R._1 Fax: (209)464-0Robert McClellon,R.E.H,S.13& Mirk Bmellos,REES. <br /> Program Manager <br /> NOV 2:7 2.0.02 <br /> jorb TOSTEZR <br /> aT sToops <br /> �:4go- TOST. .rs ROAD: <br /> TRACY 'CA. <br /> RE: Curtiss.Ponriae dillap <br /> SITECOD <br /> : E' 7 1877 <br /> 2450 Toste-Road <br /> Tf6q CA 96376 <br /> San.joaquin.County..Environmental Health Department(SJC/EHD).has reweave the. <br /> "Remedial Action Work Plan" (RAWP)dated October 31, 2002 that:Wa$P`(4P.a. .r0. .d..on. <br /> has-thelo ing,comments�. <br /> yo&.1aeba.10. by Advance&GeoEnviron mental (AGE) and Pow.. <br /> The.RAWP:details plans for implementation of the remediation methods proposed by <br /> AGE in the Corrective Action Plan dated July 18, 2002. $pecifically, excavation of <br /> fi <br /> contaminated..Soils will be performed,followed by continued monitoringoff the <br /> groundwater forcation.Iof natural attenuation parameters, <br /> approximately 1,000 cubic yards of contaminated <br /> TheRMVP proposes�exdavation of <br /> soil and approximately 800 cubic yards of potentially uncontaminated overburden. <br /> These-estimates were:based on soil samples collected during the.,'site investigation. The <br /> clean overburden will be screened by observation and an organic vapor meter, <br /> s I egregated, and used as backfill material. The remainder of the excavation will be filled <br /> with imported clean fill or road base. The contaminated soil will be stockpiled, sampled <br /> and removed to an appropriate disposal facility. A minimum-of 28 soil samples will be <br /> collected from the bottom and sidewalls of the excavation pit. :Samples will be analyzed <br /> for total petroleum hydrocarbons (TPH)as aasoline, TPH as diesel, benzene,toluene, <br /> ethylbenzene and xylenes, and oxygenated fuel additives. <br /> Prior to the excavation, monitoring wells MWA B, MW-4 and MW-7 will be destroyed by <br /> r. over drilling to total depth and backfilling with neat cement. Following excavation,these <br /> three wells will be reinstalled to the same depths with the same screen intervals. <br /> Following the excavation and removal activities, AGE proposes monitored natural <br /> attenuation to complete the remediation of this site. Groundwater sample collection and <br /> 4. analysis is proposed to continue on a quarterly basis for one year, and annually <br /> thereafter. SJC/EHD does not approve this reduction in monitoring at this time. <br /> Quarterly monitoring of the groundwater must continue until directed otherwise by this <br /> office. Analysis of groundwater samples will include:TPHg and TPHd by EPA Method <br /> 8015 modified, BTEX compounds and fuel additives including 1,2-dichloroethane and <br /> ethylene dibromide by EPA Method 8260B, and dissolved,oxygen, carbon dioxide, <br /> alkalinity, hardness, soluble iron and redox potential. <br />