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California Regional Water Quality Control Boarda <br /> Central Valley Region <br /> Robert Schneider Chair <br /> Tamm�nen Arnold Schwaizenegger <br /> Secretary for 11020 Sun Center Drive#200 Rancho Cordova, CA 95670-6114 Governor <br /> Environmental (916)464-3291•Fax(916)464-4704 <br /> Protection http,/www swrcb ca gov/rwgcb5 <br /> 6 May 2004 <br /> Mr Cecil Dillon Mr Richard Bokides Mr Navtej Dhmgsa <br /> Flag City Ltd Partnership Bolades Family Ltd Partnership First Investment Flag City, Inc <br /> 1820 W Kettleman Lane, Suite E 6421 Capitol Avenue 517 Coronawood Lane <br /> Lodi, CA 95242 Lodi, CA 95242 Carmichael, CA 95608 <br /> REVIEW, FLAG CITY CHEVRON, 6421 CAPITOL AVENUE,LODI,SAN JOAQUIN COUNTY, CLEANUP AND <br /> ABATEMENT ORDER (C&A)NO. 5-00-700 <br /> I reviewed the Work Plan Addendum-April 2004 (Workplan), received 20 April March 2004, submitted on Chevron's <br /> behalf by Advanced GeoEnvironmental, Inc The Workplan proposes installing one dual-completion(nested wells) <br /> monitoring well in the street south of New West Petroleum, 6437 Banner Avenue in the first water zone (screened <br /> from 10 to 25 feet) and second water zone (screened from 45 to 50 feet) aquifers The purpose of this nested well <br /> Q\4W-19) is to extenc the monitoring well network upgradient(north) of the site, to verify Cone Penetrometer Testing <br /> (CPT) analytical data,which indicates that methyl tert-butyl ether detected in monitoring well MW-8A may be <br /> coming from an upgradient, offsite source The Workplan includes a geological cross section (Figure 3) of first and <br /> coming <br /> aquifer zones The Workplan proposes taking 2-foot cores for every 5 feet of boring depth <br /> I concur to the Workplan with the following modifications <br /> • Continuously core the boring for lirhalogy Continuous coring will help identify thin pen-neable and <br /> impermeable sedimentary beds, be useful for updating cross sections in the Sire Conceptual yloael, and may <br /> result in optimum placement of well screens if hthology changes laterally <br /> a Continuously sound depths with a weighted measuring tape during well construction, to assure proper <br /> placement of filter pack and bentonite pellets without bridging <br /> o Use spacers (centralizers)to ensure a minimum 2" of filter pack, seal, or grout around each well casing in <br /> the single boring <br /> Please also do the following when CPT analytical data and/or CPT cross-sections are provided, include a copy of the <br /> CPT boring logs in future submittals, provide a report of the monitoring well installation in the next monitoring <br /> report, apply for required pernvt(s) from San Joaquin. County Environmental Health Department, and provide at least <br /> 72 hours prior notice, so that I may be present for the fieldwork You may contact me at(916) 464-4615 with any <br /> questions or comments <br /> JamesfLBarton, R G j <br /> Engineering Geologist <br /> cc Mr Mark Owens,UST Cleanup Fund, SWRCB, Sacramento <br /> Mr Mike Infurna, San Joaquin County Environmental Health Division, Stockton <br /> Mr Scott Rishwain, Rishwain&Rishwain, Stockton <br /> Mr Ben Guzman, San Joaquin County Municipal Utilities, Stockton <br /> Mr Timothy J Cuellar, Advanced GeoEnvironmental, Incorporated, Stockton <br /> California Environmental Protection Agency <br /> `a Recycled Paper <br />