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Caffornia Regional Water Quanty flontrol Board Central Valley Region a Robert Schneider,Chair Won H Hicicox Gray Davis S.,.'aryfior Sacramento Main Office Governor Environmental Internet Address http//www swrcb ca gov/rwgch5 ,rz Prnreciron 3443 Routier Road,Suite A,Sacramento,California 95827-300 — = „R"!,r Phone(916)255-3000-FAX(916)255-3015 ��++ 7 November 2001 Mr Cecil Dillon Mr Richard Bolades Mr Navtel Dhmgsa Flag City Ltd Partnership Bolades Family Ltd Part First Invest Flag City, Inc 1820 W Kettleman Lane, Suite E 6421 Capitol Avenue 5517 Coronawood Lane Lodi, CA 95242 Lodi, CA 95242 Carmichael, CA 95608 REVIEW QUARTERL Y MONITORING REPORT', FLAG C=CHEVRON, 6421 CAPITOL AVENUE,LODI, SAN JOA QUIN COUNTY, CLEANUP AND ABATEMENT ORDER (C&A)NO. 5-00-700 I reviewed the 15 October 2001 Quarterly Report—Third Quarter 2001 (QMR) submitted by Advanced GeoEnvironmental, Incorporated(AGE) for the Flag City Chevron site Tree QMR documents decreasing trends of MtBE contamination in on-site monitoring and extraction wells due to continued groundwater extraction and treatment Concentrations of MtBFi jn on-site monitoring well MW-1 have decreased from a maximum of 5,700 micrograms per liter(µg/1) in June 2400 to 3 3 µg11 in September 2001 • In our 8 August 2001 Quarterly Monitoring Report review letter,we requested an update to the 31 August 2000 Final Remediation Plant (FRP) The FRP Update was requested to address the off-site MtBE contamination identified in Flag City Chevron monitoring wells MW-7, MW-11A and MW-11B,and in Three B's Truck Plaza monitoring well N W-4 centered around Rocky's Domestic Well. The FRP Update was delinquent as of 24 September 2001, and-must be submitted without further delay In the QMR,AGE recommended continued quarterly monitoring and sampling coordinated with monitoring and sampling at Three B's Truck Plaza_ We agree to continue monitoring and sampling, however,based on the decreasing trends documented in the historical groundwater monitoring tables, a reduction in sampling frequency and constituents is appropriate Once the FRP Update is received,I can meet with AGE to discuss a plan to reduce sampling frequency and constituents sampled AGE also recommended continued selective groundwater extraction in alternating weekly sb>fts from the north trench line(extraction wells EW-5,EW-7, EW-8, and EW-10)to the south trench line (extraction wells EW-2, EW-4, EW-6, and EW-9) As presented in Table 5 and on Figure 9 from the QMR,extraction wells EW-7 and EW-10 in the north trench line are non--detect for all constituents, and maxiniurn MtBE concentrations were identified at extraction wells EW-5 (35 µg/l), and EWA (14 µg/1) Therefore,EW-4 and EW-5 should be operated continuously, and extraction wells EW-2,EW-6,EW-8, and EW-9 should be alternated weekly I reviewed the sampling requirements for monitoring and reporting under General Order No 5-00-119 for Discharge to Surface Waters of Groundwater from Cleanup of Petroleum Fuel Pollution Lead was initially identified at 0 0068 µg/l in the influent sample, and at 0 019 µg/l m the effluent sample collected on • California Environmental Protection Agency r d Recycled Paper 'Me energy challenge facing California is real Every Califomian needs to take tnunedtate action to reduce energy consumption. For a list of simple ways you can reduce demand and cut your energy costs,see our Web-site at httpJ/www swrcb=gov/rwgcb5