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` Mr. Robert Trommer �i Page 4 of 7 <br /> Comments on CUP Site Closure Recommendations for Various Sites March 3, 2010 <br /> Claim No. 11775 - 2315 N. California Street,.Stockton <br /> This site is nearing',closure. The EHD is 'satisfied with plume delineation and attenuation. <br /> Potential direct contact with impacted soil. is limited, and' continuing flux to groundwater is <br /> apparently declining. The-main concern at this'point.is an adequate evaluation of the potential <br /> for vapor intrusion from residual'impacted soil. Soil.gas samples have not been collected and <br /> the consultant has stated that future buildings would have:a vapor barrier installed and exiting <br /> buildings have an adequate air exchange rate that would .adequately mitigate any intruding. <br /> vapor. None of these comments were demonstrated through modeling with site-specific data. <br /> The EHD will pursue a more adequate vapor intrusion evaluation with the responsible party and <br /> her consultant. The EHD estimates that six to :nine months may be required to achieve site <br /> closure. <br /> Claim No. 12489 - 15600 S. Harlan Road: Stockton . <br /> This site is in the closure process needing: only the waste manifest for the monitoring well <br /> destruction. The EHD anticipates site closure in-one to two months. <br /> Claim No: 13651 -4100 E."Fremont Street, Stockton <br /> This site is in the closure process, and a site closure report has been °requested. The EHD <br />!, estimates that three to six months will'be required to achieve final site closure, as the report has <br /> f not been received or evaluated and monitoring wells will need to be destroyed. <br /> E <br /> I� Claim No. 13879 - 466_Moffat Blvd., Man#eca - <br /> i ., , <br /> f This site is in the closure process, and ,documents for notlfication to the -CVRWQCB are in <br />! preparation. The EHD anticipates final site closure in three to six months. <br /> r <br /> Claim_No._14281 - 1001 W. Yosemite Avenue, Manteca , <br /> 'This site is in the closure process. The EHD needs the Record Title Owner certification, but the <br /> responsible party (RP) has been in India. The RP is expected'to return to the United States in <br /> 4 March 2010. The EHD estimates one to two months will be needed to achieve final site closure. <br /> Claim No. 15460 -.2732 Citrus Road, Rancho Cordova.. <br /> This site is not in San Joaquin County or in our Local Oversight Program (LOP). <br /> E <br /> f Claim No. 1350 - 574 Grant Line Road Trac <br /> E _ <br /> R <br /> j The site has been under ozone remedlation, -and analytical results from groundwater samples <br /> collected from the site's monitoring wells appear to be favorable for closure consideration; <br /> however, confirmation - grab groundwater sampling between ozone injection points and: <br /> monitoring wells revealed elevated contaminant concentrations. The contaminant concentration <br /> in the. British Petroleum (BP; site .address 2375 Tracy Blvd., Tracy) monitoring well MW-6, <br /> located on the subject site is-.impacted'at concentrations consistent with those obtained in the <br /> confirmation samples. This plume, with its core <br /> p p apparently near 'BP's MW-6, appears .to be <br /> delineated laterally based on the'rrionitoring well network on the subject site, the BP site and the <br /> Chevron site at 575 Grant Line Rd. Vertical delineation of this plume is not'certain at this time. <br /> The EHD will direct submittal of a site closure report for the subject site with the issue related'to <br /> i <br /> this plume directly addressed along with evaluation of vapor intrusion and health risk potentials. <br /> E Comments on CUF Site Closure:Recorrimendations 031.0.doc <br />