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44 <br /> li <br /> GEORGE DEUVOEiiAN.Governer <br /> CALIrORNIA REGIONAL WATER QUALITY CONTROL BOARD- <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTiER ROAD <br /> SACRAMENTO,CA 958273098 <br /> 18 September 1987 �/;�i rza <br /> legMr. Mike Hansen SEP <br /> Kayo Oil Company <br /> P.O. Box 190 ENVIRoM <br /> Lodi, CA 95241 ENTAL HEALTJJ <br /> PERMIT/SERVICE,S, <br /> COMMENTS ON THE GROUNDWATER CONTAMINATION ASSESSMENT REPORT AND <br /> FINAL REMEDIATION PLAN PREPARED BY DU PONT FOR 800 E. HIGHWAY 12 , <br /> LODI <br /> Thank you for submitting your draft plans for soil and ground <br /> water biodegradation for our review. The two volumes prepared by <br /> Du Pont and submitted to Regional Board staff during a meeting on <br /> 10 September 1987 are � overall Well prepared documents. Your <br /> geologic interpretations, based primarily on information availble <br /> to previous consultants - are well one. <br /> However, the "Final Rem6diation Plan" is premature because the <br /> problem assessment is not yet com lete. We have some comments, <br /> noted several minor editorial problems, and some points we wish <br /> to have clarified. <br /> COMMENTS ON THE TWO VOLUMES SUBMITTED: <br /> 1- Waste Dischar"ge Requirements may be required for <br /> introducing nitrates, phosphates, and hydrogen peroxide <br /> into the groun" d water if the extraction system is not <br /> totally effective and allows them to migrate to your <br /> monitor wells,! <br /> 2- Which laboratory performed the soil analyses for <br /> samples from B-1, 2,3,4 and MW-19, 20,21 and what are the <br /> detection limits and QA/QC procedures for these <br /> analyses. <br /> 3- New monitor well installation (including redrills) must <br /> be supervised by a California Registered Geologist or <br /> Certified Engineering Geologist. <br /> 4- The operating recovery well RW-1 has a radius of <br /> influence of about 80 feet (Figures 12-15) . It appears <br /> that a minimum of three recovery wells properly spaced <br /> may be necessary to control contaminated ground water <br /> movement at the site. <br /> 5- NW-11 was reported as having a slight sheen on the <br /> water in June ,, 1987 (Table 4, page 33) so your statement <br /> that the welli;is clean is apparently incorrect. <br /> j <br />