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.r FwjA <br /> fly t <br /> rRYAT SED <br /> D`VV61rking To Restore Nature <br /> 1710 Main Street 93 AUG I I PM 12: 28 <br /> Escalon, CA 95320 <br /> Phone: (209) 838-3507 <br /> FAX: (209) 838-3509 <br /> August 9, 1993 <br /> Ms. Diane Hinson <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> RE: Diamond Walnut Growers, 1050 South Diamond Street, Stockton, California <br /> Dear Ms. Hinson: <br /> Enclosed please find a copy of the requested workplan for further subsurface investigation related <br /> to the former underground storage vaults at the referenced site. <br /> Our workplan proposes to investigate the lateral and vertical distribution of chromium in soils <br /> affected by leakage from former vault #8. This information will be used to delineate the limits of <br /> soil impact as well as to chemically characterize the soil preliminary to evaluating the necessity and <br /> feasibility of in situ remediation. <br /> The history of product usage in the glycol vaults leads us to believe that further investigation is <br /> unnecessary. Previous soil tests revealed that the glycols had not reached groundwater, although <br /> they had more than enough time to do so. This fact is consistent with degradation expectations; <br /> as you are aware, glycols degrade rapidly in soil. Of course, if, after review of the enclosed <br /> materials, you still believe additional glycol tests are necessary, we will collect soil samples with <br /> the objective of verifying or refuting previous soil analyses that reported the presence of ethylene <br /> glycol beneath former vaults #1 and #6. <br /> If you have any questions or comments regarding the workplan, please feel free to contact me <br /> anytime. <br /> Respectfully, <br /> RESNA Industries, Inc. <br /> Gregory P. Stahl <br /> CA Registered Geologist No. 5023 <br /> GPS/ggk <br /> Enclosure <br /> 1.080993.FYL 1•��� <br />