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Advanced GeoEnvironental, Inc . 15 June 2001 AGE-NC Project No. 96-0232 Mr.Marty Hartzell California Regional Water Quality Control Board-Central Valley Region 3443 Routier Road, Suite A Sacramento, CA 95827 Subject: Addendum to Quarterly Report-First Quarter 2001,dated 13 April 2001 FLAG CITY CHEVRON- 6421 Capitol Avenue,Lodi, CA 95242 Dear Mr. Hartzell: On behalf of Mr. Richard Bokides of the Bokides Family Limited Partnership and property owner of Flag City Chevron located at 6421 Capitol Avenue (site), Lodi, California,Advanced GeoEnvironmental, Inc. (AGE) is submitting this addendum to Quarterly Report- First Quarter 2001, dated 13 April 2001. This addendum is in compliance with a California Regional Water Quality Control Board-Central Valley Region (RWQCB) letter directive, dated 04 June 2001. The following summarizes and addresses the revisions requested in the 4 June 2001 RWQCB letter: • Influent sample results for lead analysis in February:The February 2001 influent-total lead in Table 1 was revised to represent the effluent-total lead analysis (non-detect). The influent and effluent monitoring points are separated by carbon-treatment media vessels which should not effect the total lead analysis. • Influent sample results for all constituents in the month of March: Ground water samples were collected from extraction wells EW-2,EW-4,EW-5,EW-6,EW-7,EW-8,EW-9 and EW-10(EW-2 through EW-10)on 08 March 2001 which was representative of the influent monitoring point.The March 2001 influent values in Table 1 were modified to represent the average laboratory values for the laboratory analysis of EW-2 through EW-10. • Effluent sample results for 7DS and nitrate in February: Ground water samples collected from the effluent-monitoring point on 06 February 2001 were reported by GeoAnalytical Laboratories hie. (GAL)as having a TDS value of 660 milligrams per liter(mg/L)and a nitrate value of 38 mg/L.The February 2001 effluent-TDS and nitrate columns in Table 2 have been modified to include these values. A copy of the GAL report is included with this addendum. • Effluent results for temperature and flaw rate: Effluent monitoring data for temperature and flow rate were collected between December 2000 and March 2001 utilizing field instruments and recorded in a field notebook.The effluent-row in Table 2 has been modified to include all monthly monitoring effluent results for temperature and flow rate. • Receiving water sample results for all constituents in the month of February: Upstream receiving water monitoring point R-1 was "dry"during February 2001 and therefore not monitored. Ground water samples collected from receiving water monitoring point R-2 on 06 February 2001 were 837 Shaw Road,Stockton,California 95215 Telephone(209)467-1006 FAX(209)467-1118