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Mr. Robert Trommer <br /> Page 7 of 7 i <br /> ` Comments on CUF Site Closure Recommendations for Various Sites March 3, 2010 <br /> Claim No. 17042 - 15406 S. Tracy Blvd, Tracv <br /> This site has .persistent moderate TPHg, and low ethylbenzene and xylenes contaminants in <br /> one well, MW-4. Wells toward the north, east and south are not impacted; there are no <br /> delineating wells toward the west. A domestic well is located approximately 135 feet southwest <br /> of MW-4. In November 2009 limited groundwater extraction (GWE) was implemented utilizing , <br /> MW-4. Approximately 15,000 gallons were extracted from the well. Since then the well has <br /> been monitored monthly; concentrations were reduced, but may be rebounding. The consultant <br /> plans to complete the rebound testing with the March sampling event and then prepare a report <br /> of findings. The plume appears to be of limited extent, except toward the west, which is not <br /> characterized. Significantly impacted soil has not been encountered on the site. There does not <br /> appear to be a significant contaminant mass present, but the contaminants are persistent and <br /> there is a domestic well to protect. The EHD will issue a directive to prepare a site closure <br /> summary report, addressing plume:delineation and evaluation of vapor intrusion and health risk <br /> issues, threat to the domestic well, and other site closure concerns. if a favorable report is <br /> received, the EHD anticipates site closure in nine to twelve months. <br /> - 1 <br /> Claim No. 17179 - 15 E. Grant Line Road T <br /> rac i <br /> i <br /> Dissolved contaminant concentrati6ns have declined to levels suitable for site closure 1 <br /> consideration. -The consultant has recently obtained grab groundwater samples to complete the <br /> lateral and vertical delineation of the site, and the results are pending. The EHD will direct <br /> completion of a vapor intrusion'evaluation. Upon receipt of the results of the recent grab <br /> groundwater investigation and the vapor intrusion evaluation, the EHD will initiate the site <br /> closure process if warranted by the additional information. The EHD anticipates site closure may <br /> be obtained in six to twelve months' <br /> Summary <br /> The EHD will be moving these sites to closure.as rapidly as possible. The EHD has responded <br /> previous) to the CUF on these sites es in res onse.#o the five-year five year reviews and the .annual <br /> updates. Direct comments from the'CUF technical staff on the concerns expressed on the more <br /> problematic sites above are requested (specifically Claim Nos. 8431, 7709, 11775, 14118, <br /> 14349, 14353, 15211, 15890, and X17042). An EHD representative is available to meet with <br /> our technical staff if that would b <br /> Y e helpful. <br /> If you need more information to complete your evaluation of these cases; please contact Nuel <br /> Henderson, Engineering Geologist, at (209) 468-3436, or nhenderson s'cehd.com. <br /> Sincerely, <br /> Nuel C. Henderson, Jr., PG Adrienne Ellsaesser, REHS <br /> Engineering Geologist Acting Program Coordinator <br /> Comments on CUF Site Closure Recommendations 0310.doc � <br /> i + <br />