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San Joaquin County <br /> nAronmental Health Department DIRECTOR <br /> ? ' —=L ' ' O Donna Heran, REHS <br /> 600 East Main Street <br /> N Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> Robert McClellon, REHS <br /> Jeff Carruesco, REHS, RDI <br /> cgciFS"arc Website: www.sjgov.org/ehd Kasey Foley, RENS <br /> Phone: (209) 468-3420 <br /> Fax: (209) 464-0138 <br /> June 14 , 2010 <br /> Messrs. Kirk Larson , PG , and Robert Trommer, CHG <br /> State Water Resources Control Board <br /> Division of Financial Assistance <br /> 1001 1 Street <br /> Sacramento CA 95814 <br /> Subject: April and May 2010 Draft Five-Year Review Recommendations , Caseworker <br /> Vicki McCartney's Sites <br /> San Joaquin County Environmental Health Department (EHD) has received and reviewed the <br /> draft annual five-year review update letter issued by the State Water Resources Control Board <br /> Cleanup Fund (CUF) for various sites referenced below and comments as follows: <br /> 3400 Newton Road, Stockton, CA; Claim Number 14353: The CUF concurred with the EHD's <br /> directive to conduct soil vapor extraction (SVE) and recommended that the responsible party <br /> (RP) expedite the cleanup . Our agencies are in agreement. The EHD has recently issued a 30- <br /> day letter to complete an SVE pilot test. <br /> 3105 S. EI Dorado Street, Stockton, CA; Claim Number 8489: The CUF repeated a <br /> recommendation that the EHD direct the RP to assess remedial technologies and implement <br /> active remediation to reduce contaminant mass and achieve water quality objectives (WQOs) in <br /> a timely manner. The EHD is in agreement with this recommendation and will issue such a <br /> directive upon conclusion of impending assessment work. A plan for continuous free product <br /> removal is also about to be implemented . <br /> 106 Second Avenue, Ripon , CA; Claim Number 1978: The CUF recommendation was to <br /> consider this site for closure. By letter dated March 3, 2010, the EHD informed the CUF of the <br /> remaining closure concern with this site, specifically: The contaminants are generally delineated <br /> for this release, except toward the north as demonstrated by impacted CPT grab groundwater <br /> samples collected from boring CPT3 near the center of Second Street, therefore, the plume is <br /> undefined toward the north. As a municipal well was formerly located toward the northeast of <br /> the site, a work plan to obtain additional grab groundwater samples north and northeast of the <br /> site has been approved to complete plume delineation. Monitoring well MW-3 used to be the <br /> heavily impacted well, but the plume shifted to MW-2 between 2003 and 2005, and appears to <br /> be gradually declining in MW-2 since 2007. Without knowing the pumping history of the former <br /> municipal well, the EHD is concerned that the change in plume stability may be related to the <br /> change in the municipal well usage. Assuming favorable result from the grab groundwater <br /> samples, the EHD anticipates closing this site in six to nine months (to allow time to perform the <br /> field work, prepare and review the report of findings, and destroy monitoring wells) . At this time <br /> April and May 2010 Annual 5-year Reviews Vickie's Sites .doc <br />