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Mr. Robert Trommer = Page 4 of 7 Comments on CUF Site Closure Recommendations for Various Sites March 3, 2010 Claire No. 11775 -2315 N. California Street, Stockton This site is nearing closure. The EHD is satisfied with~plume delineation and attenuation. Potential .direct contact with impacted soil is limited, and continuing flux to groundwater is apparently declining. The main concern at this point is an .adequate evaluation of the potential for vapor intrusion from residual impacted soil. Soil gas samples, have not been collected and the consultant has stated that future buildings would have'a vapor barrier installed and exiting buildings have an adequate air exchange rate that would adequately mitigate any intruding vapor. None of these comments were demonstrated through modeling with site-specific data. The 'EHD will pursue a more adequate vapor intrusion evaluation with the responsible party and i her consultant. The EHD estimates that six to nine months .may-be required to achieve site closure. Claim No. 12489 - 15600 S. Harlan Road, Stockton i This site is in the closure process needing only the waste manifest for the monitoring well destruction. The EHD anticipates site closure in one to two months. Claim No. 13651 -4100 E. Fremont Street, Stockton This site is in the closure process, and a site closure report has been requested. The EHD estimates that three to six months will be required to achieve final site closure, as the report has . not been received or evaluated and monitoring wells will need to be destroyed. Claim No. 13879 - 466 Moffat Blvd., Manteca This site is in the closure process, and documents for notification to the CVRWQCB are in I preparation. The EHD anticipates final site closure in three to six months. Claim No. 14281 - 1001 W. Yosemite Avenue..Manteca { This site is in the closure process. The EHD needs the Record.Title Owner certification, but the responsible party (RP) has been in India. The RP is expected to 'retum to the United States in March 2010. The EHD estimates one to two months will be needed to achieve final site closure. Claim No. 15460 - 2732 Citrus Road, Rancho Cordova 4 . This site is not in San Joaquin County or in our Local Oversight Program (LOP). Claim No. 1350 - 574 Grant Line Road, Tracy l . t The site has been under-ozone remediation, and analytical results from groundwater samples collected from the site's monitoring wells appear to be favorable for closure consideration; however, confirmation grab groundwater sampling between ..ozone injection points and monitoring wells revealed elevated contaminant.concentrations. The contaminant concentration in the British Petroleum (BP; site address 2375 Tracy Blvd., Tracy) monitoring well MW-6, located on the subject site is impacted at concentrations consistent with those obtained in the confirmation samples. This plume, with its core apparently near BP's MW-6, appears to be delineated laterally rased on the monitoring well network on the subject site, the BP site and the Chevron site at 575 Grant Line Rd. Vertical delineation of this plume is not certain:at this time. The EHD will direct submittal of a site closure report for the subject site with the issue related to this plume directly'addressed along with evaluation.of vapor.intrusion and health risk potentials. Comments on CUF Site Closure Recommendations 0310.doe.