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Mr. Robert Trommer �' 4,• <br /> Comments on CUF Site Closure Recommendations for Various Sites Page 4 of 7 <br /> 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 /> not been received or evaluated and monitoring wells will need to be destroyed. <br /> Claim No. 13879 -466 Moffat Blvd., Manteca <br /> This site is in the closure process, and documents for notification to the CVRWQCB are in <br /> preparation. The EHD anticipates final site closure in three to six months. <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 /> 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 /> Claim No. 1350 - 574 Grant Line Road, Tracy <br /> The site has been under ozone remediation, 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 apparently near BP's MW-6, appears to be <br /> delineated laterally based on the monitoring 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 /> this plume directly addressed along with evaluation of vapor intrusion and health risk potentials. <br /> Comments on CUF Site Closure Recommendations 0310.doc <br />