Laserfiche WebLink
California Re0 nal Water Quality Ci trol Board <br /> Central Valley Region Davisb. . <br /> ,. <br /> Robert Schneider,Chair Gray D <br /> Winston H.Hickox Sacramento Main OfGovernor <br /> Secretaryfor Office <br /> Environmental Internet Address: http:/lwww.swrcb.cagov/rwgcb5 <br /> Prolection 3443 Rcutier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)255-3000•FAX(916)255-3015 <br /> 28 February 2002 <br /> Mr. Cecil Dillon Mr.Richard Bokides Mr.Navtei Dhingsa <br /> y <br /> Bokides Famil Ltd.Part. First Invest.Flag City,Inc, <br /> Flag City Ltd.Partnership 5517 oronawood Lane <br /> 1820 W.Kettleman Lane, Suite E 6421 Capitol Avenue 5517 Chael, wo 95608 <br /> Lodi, CA 95242 Lodi, CA 95242 <br /> REVIEW FINAL REMEDL47IONPLANADDENDUM, <br /> FLAG CITY CHEVRON, 6421 CAPITOL AVENUE,LODI,SAN JOAQUIN COUNTY, <br /> CLEANUP AND ABATEMENT ORDER (C&A)NO. 5-00-700 <br /> Board staff reviewed the 7 December 2001 Final Remediation Plan Addendum (FRP Addendum)submitted <br /> by Advanced GeoEnvironmental,Incorporated(AGE)for the Flag City Chevron site. The FRP Addendum <br /> was requested by Board staff to address the MtBE-impacted groundwater plume that extends west of the Flag <br /> City Chevron site and is currently centered on Rocky's Domestic Well(RDW-1). <br /> Based on the success of Flag City Chevron's on-site groundwater extraction and treatment system to reduce <br /> MtBE concentrations in groundwater,AGE proposes to install three six-inch diameter extraction wells in the <br /> general area of RDW-1,extract contaminated groundwater from the first water bearing zone at 10 to 35 feet, <br /> and pipe the water back to the Flag City Chevron site for treatment. Board staff concur that Flag City <br /> Chevron's groundwater extraction and treatment system has reduced on-site MtBE concentrations <br /> considerably;however,the extent of contamination on-site was concentrated in the first water bearing zone, <br /> whereas the off-site MtBE-impacted groundwater plume extends from 10 to 75 feet below ground surface <br /> with the highest concentrations consistently identified in monitoring well MW-11B screened at 65 to 75 feet. <br /> Based on the known extent of MtBE contamination centered on RDW-1,Board staff do not believe that <br /> groundwater extraction at 10 to 35 feet will significantly reduce MtBE contamination identified to 75 feet and <br /> deeper. Thus,the scope of work for off-site groundwater extraction and treatment is not approved. We <br /> believe that in-situ remedial methods may be more cost effective, and therefore should be evaluated for <br /> remediation of groundwater contamination in this off-site plume. <br /> RDW-1 is scheduled to be destroyed on 6 March 2002 following connection of Rocky's Restaurant to <br /> municipal supplied water. Once RDW-1 is destroyed,the remaining contamination in groundwater may be <br /> affected by operation of other water supply wells in the area including Three B's domestic well at <br /> approximately 280 feet west of RDW-1. We would like to see how groundwater flow directions and gradients <br /> change after RDW-1 is destroyed, and then implement the best available technology to reduce MtBE <br /> contamination in groundwater. <br /> California Environmental Protection Agency <br /> P.d Recycled Paper <br /> The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. <br /> For a list of simple ways you can reduce demand and cut your energy costs,see our web-site at http://www.swrcb.ca.gov/mgcb5 <br />