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CanonleEnvironmental <br /> a <br /> Canonie Environmefi[aI Services Corp. <br /> 1710 Main Street <br /> Escalon , California 95320 <br /> Phone: 209-838-3507 <br /> March 3 , 1995 Phone: 800-9260806 <br /> Fax: 209-8383509 <br /> 94-333-001 -T4 <br /> Mr. Michael Infurna <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P. O. Box 2009 <br /> Stockton, CA 95201 <br /> Subject: Proposed 1995 Groundwater Monitoring and Sampling Schedule <br /> King Island Resort, 11530 West Eight Mile Road , Stockton, California <br /> Site Code: 1557 <br /> Mr. Infurna: <br /> This letter is submitted by Smith Environmental Technonlogies/Canonie Environmental <br /> Services Corp. on behalf of Westrec Marinas/King Island Resort (Westrec) to present the <br /> proposed groundwater monitoring and sampling schedule for 1995 calendar year at the subject <br /> site (Plate 1) . <br /> The California Regional Water Quality Control Board has indicated (CRWQCB, January 17, <br /> 1995) that typically, if a monitoring well has had four consecutive quarters of nondetection and <br /> it is still needed to determine whether a plume is migrating or not, the monitoring frequency <br /> can be reduced to semi-annually to convey the effects of seasonal changes . However, if the <br /> monitoring well is not needed to monitor plume migration it can be completely removed from <br /> the monitoring program . If all monitoring wells show nondetect for four consecutive quarters, <br /> then closure of ail investigation and/or remediation activities at the f cility will be considered. <br /> Accordingly, the following groundwater sampling schedule is proposed for the 1995 calendar <br /> year at the subject site: <br /> Wells MWl , MW2, and MW3 will be removed from the sampling schedule, based upon <br /> their position upgradient or crossgradient from the impacted well (MW4) and their history <br /> of nondetect results, including at least seven consecutive quarters of nondetect results. <br /> Wells MW4 and MW5 will continue to be sampled on a semi-annual basis, as approved in <br /> PHS/EHD correspondence dated August 4, 1993 , until four consecutive sampling events <br /> show nondetect results . <br /> 150075\LETTERS\L-030395 .doc 1 <br />