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j auPoNT <br /> Eb <br /> „ T ,,,r RECEIVD <br /> F5T18uSHC01B02 +q� 498C' Y E. 1. DU PONT DE NEMOURS & COMPANY ��� l C( <br /> INCORPORATED <br /> WILMINGTON, DELAWARE 19898 <br /> CHEMICALS AND PIGMENTS DEPARTMENT <br /> October 8, 1987 <br /> Mr. Michael Hansen <br /> Kayo Oil Company <br /> P.O. Box 190 <br /> Lodi , CA 95421 <br /> RE: CVRWQCB Comments on the Groundwater Contamination Assessment Report <br /> and the Remediation Plan Report prepared b� Du Pont for 800 E. Highway 12, <br /> Lodi . <br /> Dear Mr. Hansen: <br /> We have carefully considered the questions and comments transmitted by Mr. <br /> Gary Johnson of the Central Valley Regional Water Quality Control Board in <br /> his letter of September 18, 1987. The answers to many of these questions <br /> have been incorporated into the final versions of our two reports, which <br /> you should receive shortly. However, this letter addresses each of his <br /> questions or comments specifically item by item. <br /> REPLIES TO "COMMENTS ON THE TWO VOLUMES SUBMITTED" : <br /> 1 - In response to the need for wast discharge requirements, <br /> several points need, to be made. <br /> A. Nitrates will not be used in bioremediation and will not be <br /> introduced into- the groundwater by Du Pont. <br /> B. Hydrogen peroxide spontaneously decomposes to form water and <br /> oxygen. This will be especially rapid in the air stripper. <br /> C. Residual phosphate after passage through the air stripper <br /> will be consumed by microorganisms in the pond or be <br /> recycled back into the groundwater, thus eliminating any . <br /> accumulation of phosphate. Once phosphate addition has <br /> ceased after bioremediation, the phosphate levels will <br /> quickly return to baseline, usually within 2-4 weeks. <br /> 2 - Copies of the original reports from Canonie Environmental have <br /> been been added to Table 3. Canonie is a California approved <br />` laboratory and as such their QA/QC procedures are on file. <br /> E <br /> f <br /> 3 - All new well installations (including redrills) will be <br />€ supervised by a California Registered Geologist or Certified <br />€ Engineering Geologist. This supervision will be furnished by <br /> our local subcontractors. <br />