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16, February 13, 199$ REUEFNED <br /> FEB 25 1998 <br /> Michael Infurna, Sr REHS nom, � ENV1HONMEN SAL HEALTHSan Joaquin County PHS �` PERMIT/ ��PVEC�� <br /> Environmental Health Division <br /> P. 4. Box 388 <br /> Stockton, CA 95201-0388 <br /> Re 1997 Annual Groundwater Monitoring and Sampling Report, 1500 Shaw Road, Stockton, <br /> CA, Site Code 1727, AES Project No. 145-94009-01 <br /> Dear Mr Infurna <br /> This report summarizes the monitoring and sampling event conducted in 1997 Field <br /> activities at the above referenced Canteen facility included the collectionn of fluid level <br /> measurements from the eight monitor wells onsite (MW-1, MW-2, MW-3, MW-3A, MW-4, <br /> MW-5, MW-6, and MW-7) and the five offsite monitor wells (MW-8, MW-9, MW-10, MW-11, <br /> and MW-12) on the former U S Chemical property (Figure 1) <br /> Based on the groundwater elevations, the groundwater gradient was 0 16 feet per 100 feet <br /> and the general direction of groundwater flow was to the south. Fluid level measurements are <br /> summarized in Table 1 and the Potentiometric Surface Map is included as Figure 1. Historical <br />�) groundwater data are summarized in Table 2. Copies of the field data sheets and water <br /> measurement data are included in Appendix A. <br /> Free product was not detected in any of the wells, nor has it ever been The groundwater <br /> elevation was approximately six feet lower during the last monitoring event (10-10-97) than <br /> during the previous gauging (07/03/97) The groundwater elevation for the latest event was <br /> comparable to the August 1995 event. <br /> Recommendations It is recommended that the oxygen release compound (4RC) socks in <br /> monitor wells MW-2 and MW-3A be removed and that two quarterly gauging and sampling events <br /> be conducted. This would allow a more representative ground water sample to be obtained from <br /> MW-3A <br /> Sincerely, <br /> nvw e h J- <br /> Connie Choate <br /> Applied Earth Sciences, Inc gED Gf-n�ocf <br /> WILL 4,'i NJ+C,�� <br /> Wil a nter 19 NU <br /> C f is Registered Geologist No 860 oFc�t•t <br /> q ,�O <br /> 2833 Trinity Square, Suite 149 o Carrollton, Texas 75006 Tel (972) 416-7171 Fax (972) 416-7175 <br />