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1386 EAST BEAMER STREET <br /> ABAGE ESYER1v D, CA 95695-9603 <br /> GE4 ENGINEERS HCE <br /> FAX (916) 662-0273 <br /> CALIF CONTRACTOR#5I3857 A CORPORATION SEP 0 2 1992 (926) 668-5300 <br /> REGISTERED GEOLOGISTS <br /> ENVIRONMENTAL. HEATH <br /> PERMIT/SERVICES <br /> Ms. Laurie A. Cotulla August 28, 1992 <br /> Public Health Services <br /> San Joaquin County <br /> Environmental Health Division <br /> RE: USA Petroleum Station #65, 2500 W. Lodi Avenue, Lodi, CA; <br /> letter dated August 19, 1992 to USA Petroleum from PHS/EHD. <br /> USA Petroleum has contracted Western Geo-Engineers to uncover and <br /> render MW4 (previously paved over) to operating condition, this <br /> well will be used for the September Quarterly Monitoring. This <br /> action will be undertaken during the week of August 31, 1992 . <br /> San Joaquin County Public Health Services, Environmental Health <br /> Division (PHS/EHD) will be notified in the future with the advance <br /> 48 hour notice to ground water sampling at this site. <br /> Western Geo-Engineers follows established protocol for ground <br /> water sampling. The referenced letter from PHS/EHD stated that <br /> insufficient well volumes were purged prior to ground water <br /> sampling. The current LUFT manual (October 1989 ) in Appendix III <br /> pages A13-14 states that ' a well should be purged until <br /> temperature, conductivity and pH stabilize. Often, this will <br /> require removal of four or more well volumes' ; stabilization <br /> occurred in these wells and more well purging was not needed to <br /> accurately represent the ground water to be sampled. <br /> Again, proper notice will be given PHS/EHD for future sampling at <br /> this site. <br /> Respectfully, <br /> 1", CP <br /> Vern A. Bennett <br /> Project Geologist <br /> c: USA Petroleum - Srikanth Desappa <br /> c: CVRWQCB - Beth Thayer <br />