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---------------------- <br /> Mr. Robert Trommer two <br /> Comments on CUF Site Closure Recommendations for Various SitesWage 7 of 7 <br /> March 3, 2010 <br /> *Claim No:17042 - 15406 S. Trac _9 Trac <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 domesticwell is located approximately 1.35 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 riot <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 /> Claim No. 17179 -15 E. Grant Line Road Trac <br /> 5 <br /> _ Dissolved contaminant concentrations have declined to levels suitable for site closure <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 l 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 /> previously to the CUF on.these sites in response; to the 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 17042). An 'EHD representative is available to meet with <br /> your technical staff if that would be 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 nhendersongsicehd.com. <br /> Sincerely, <br /> Nuel C. Henderson, Jr., PG Adrienne Ellsaesser, REHS <br /> Engineering Geologist Acting Program Coordinator <br /> i <br /> - I! <br /> Comments on CUF Site Closure Recommendations031 o.doc <br />