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AMERICAN GEOLOGICAL SERVICES_ INC . <br /> — - Environmental, Geological, and Natural Resource Consultants <br /> -- Colorado Californ-ia Virginia Hawaii SaipanT,t <br /> June 22, 2000 =c, <br /> Mr. Marty Hartzellro <br /> w; <br /> Associate Engineering Geologist <br /> Regional Water Quality Control Board <br /> 3443 Routier Road, Suite A <br /> Sacramento, CA 95827-3003 ' <br /> RE; Tracy Cold Storage, Tracy, California. <br /> Site Code 505329 <br /> Dear Mr. Hartzell, <br /> American Geological Services conducted testing on the two water supply wells at the <br /> Tracy Cold Storage site in order to address the concerns outlined in your letter dated <br /> February 7, 2000. It is our conclusion that the data generated during the course of the <br /> investigation and remediation of this site effectively demonstrate that no impact to the <br /> lower aquifer has occurred to date, and that a minor change in the operation of the two <br /> wells will effectively eliminate any remaining potential risk to the aquifer in a cost- <br /> effective manner. <br /> The two water supply wells provide all of the water required at the site. The North Well, <br /> j installed in 1984, has been used as a supplemental water source and is critical as a backup <br /> water supply for the cold storage plant. During recent flow monitoring performed on <br /> both wells, the North Well was temporarily operated as the primary well, changing the <br /> South Well to produce as the supplemental well. These tests showed that the North <br /> Well's larger pump produced most of the necessary water, minimizing the volume needed <br /> from the South Well, while retaining the redundant water supply required at the site. <br /> i <br /> American Geological Services, on .behalf of Western Refrigerating & Cold Storage, is <br /> requesting that the Case Closure Request be reconsidered in light of the information <br /> outlined below. It is our conclusion that the.South Well represents a minimal long-term <br /> risk to ground water-quality and that the abandonment of the South Well, together with <br /> the required reinstallation of a water supply well, would not be cost-effective. <br /> • Well water usage at the site has been monitored over the past several months. The <br /> refrigerated warehouse operation is highly dependent on a reliable source of water, <br /> therefore, the redundancy of two wells must be maintained. <br /> k <br /> Telephone (209) 532-8021 14847 Mono Way, Sonora, CA 95370 FAX(209) 532-3809 <br />