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California Regional Water Quality Control Board Central Valley Region Robert Schneider, Chair tan H.H�cknx Gray Davis Secretaryfor -.r Governor Sacr�enta Ma>t?Office '�^ Environmental Intmet Address ht1p Ilwww swrcb ca gov/rwgcb5 REI_. X,7Z JD Protection 3443 Routier Road,Suite A,Sacramento,Cahtamia 95827-3003 Phone(916)255-3000•FAX(916)255-3015 AUG n €� —901, 8 August 2001 t1 Mr Cecil Dillon IVIr Richard Bokides Mr NavtcJ Dhingsa Flag City Lta Partnership Bolades Family Ltd Part Firsi Invest Flag City, Inc 1820 W Kettleman Lane, Suite E 6421 Capitol Avenue 5517 Coronawood Lane Lodi*, CA 95242 Lodi, CA 95242 Carnuchael, CA 95608 0 UA.RTFRL Y V0N_ r0R_TdV REPORT REvL W A NJ_REQUFST FOR WORKPLAN, FLAG CITY CHEVRON, 642.1 CAPITOL AYENUE,LORI,SAIV JOA 0UIN COUNTY CLEANUP AND ABATEMENT ORDER (C&A)NO. 5-00-700 I renewed the 13 July 2001 Quarterly Report— Second Quarter 2001 (QMR) submitted by Advanced GeoEnvironmental, Incorporated (AGE) for the Flag City Chevron site The QMR documents decreasing trends of MtBE contamination in on-site monitoring and extraction wells due to continued groundwater extraction and treatment Concentrations of MtBE in on-site morutoring well MW-1 have decreased from a maximum of 5,700 micrograms per liter (Agll)m June 2000 to 15 11g/1 in June 2001, and the current maximum MtBE concentration from extraction wells EW-2 through EW-10 is 140 ag/1 The on-site remediation system does not appear to be affecting off-site and deeper groundwater contamination, as observed in monitoring wells NIW-11A and MW-11B Monitoring well MW-11A, screened from 40-50 feet shows MtBE at 4 3 gg/1 in June 2001 (a decrease from 210 }ig/1 in March 2001), and ivff-11B, screened from 65-75 feet shows MtBE at 190 gg/1 in June 2001 From June 2000 to June 2001,MtBE concentrations have fluctuated between 4 3 and 810 µg/1 in NIW-11A, and between 190 and 310 lig/l in MW-11B MW-11A,B, C, and D were installed to monitor contaminant concentrations m shallow and deep water bearing zones within close proximity of Rocky's Restaurant domestic well (RDW-1) RDW-1 is screened at 67-76 feet, 87-104 feet, and 130-142 feet, and reportedly gravel-packed from 50 to 150 feet This extensive gravel pack and multiple screen intervals provide a vertical canduit for groundwater contaminants to migrate unimpeded from shallow to deep water bearing zones Groundwater sampling data from MW-11A and MW-11B shows that the MtBE identified in RDW-1 is a result of shallow MtBE-impacted groundwater intersecting the gravel pack and/or first screen interval of RDW-1, and mixing with deeper water This downward migration of contaminated groundwater through RDW-1 may exacerbate the MtBE pollution in this area resulting in increased corrective action costs and complexity of cleanup Our goal is to clean up existing groundwater contammation, and prevent further contamination of high quality groundwater in deeper aquifers This can only be achieved by properly destroying RDW-1, and elinmating the vertical conduit between the shallow and deep aquifers As discussed in a meeting at our office on 5 June 2001, we requested that the RDW-1 be properly destroyed by 31 December 2001 Therefore,you must continue 0 Californias Environmental Protection Agency CoRecycled Aaper The energy challenge facing California is real Every Californian needs to take irmriediate action to reduce energy consumption. For a list of simple ways you can reduce demand and cut your energy casts,see our web-site at httpJ/www swrcb=gov/wgcb5