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Geological Audit Services, Inc. <br /> 1803 W. March Lane, Suite A•Stockton, CA 95207•(209)956-0264•FAX(209)956-0700 <br /> 28 October 1991 <br /> (GeoAudit CV 45-49C5-1.10) <br /> Mr. Harlin Knoll <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P. O. Box 2009 <br /> Stockton, CA 95201 <br /> Subjeot: Addendum to Workplan--Western Lilt Project <br /> 3430 South 81 Dorado St. <br /> Stockton, California <br /> Dear Mr. Knoll: <br /> On 23 and 24 September 1991, Falcon Energy Associates performed <br /> remediation activities at the referenced site. A larger excavator <br /> was brought in and used to deepen the previous underground storage <br /> tank cavity to 29 ft and enlarge it to approximately 50 ft by 20 <br /> ft. The excavated soil was stockpiled with the previously excavated <br /> soil on site near the eastern edge of the property. <br /> Under your direction, Geological Audit Services collected four soil <br /> samples from the excavation. They were analyzed for total petroleum <br /> hydrocarbons, BTEX, and lead contamination. The results were <br /> received in our offices on 16 October and transmitted to you at <br /> that time. Low levels of BTEX contamination were detected in <br /> samples WL-2, WL-3, and WL-4. <br /> On behalf of Falcon Energy, we are submitting this workplan <br /> addendum to do additional excavation to remove the remaining <br /> contamination. We will use the same excavation and sampling <br /> protocol as before. The samples will be analyzed for BTEX compounds <br /> only, since the concentrations of other contaminants were near or <br /> below detection limits. <br /> Representatives of Falcon and GeoAudit will be on site the morning <br /> of Thursday, 31 October to perform the proposed work. Please <br /> contact our office on Wednesday if you have questions or comments <br /> concerning the remediation. <br /> Sincerely <br /> GEOLOI AUDIT SERVICES, INC. <br /> 4 OCT 2 9 1991 <br /> Victor B. Cherven, Ph. D. <br /> Project Geologist ENVIRONMENTAL HEALTH <br /> Registered Geologist 3475 PERMff/SERVICES <br /> Environmental Services•Hydrogeology Geotechnical Services <br />