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? ` J <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> 49 <br /> Carl Borgman,R.E.H.S. <br /> -' Donna K.Reran,R.E.H.S. 304 East Weber Avenue, Third Floor <br /> 2: Z <br /> Director Mike Huggins,R.E.H.S.,R.D.I. <br /> Al Olsen,R.E.x.S. Stockton, California 95202-2708 <br /> Douglas W.Wilson,R.E.H.S. <br /> • �.. �v • Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> 4ti FOR`' Laurie A.Cotulla,R.E.H.S. Robert McClellon,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Mark Barcellos,R.E.H.S. <br /> MAR 0 6 2003 <br /> LODI CITY CENTER 12 LLC JOSEPH K NEWFIELD <br /> C/O ANTHONY BARKETT 1900 LOWER SACRAMENTO RD <br /> 2800 MARCH LANE SUITE 350 WOODBRIDGE CA 95258 <br /> STOCKTON CA 95219 <br /> RE: Lodi Theater Project SITE CODE: 1371 <br /> 107 School Street <br /> Lodi CA 95240 <br /> San Joaquin County Environmental Health Department (SJC/EHD) has reviewed the <br /> "Quarterly Report— Fourth Quarter 2002" dated February 20, 2003 that was submitted <br /> on your behalf by Advanced GeoEnvironmental, Inc. (AGE) and has the following <br /> comments. <br /> The report documents a routine quarterly groundwater monitoring and sampling event <br /> that took place on January 13, 2003, and a routine operation and maintenance and air <br /> sampling of the onsite soil vapor extraction/air sparging (SVE/AS) remediation system <br /> that took place on October 28, 2002. <br /> Analytical results from the groundwater samples indicate that the contaminant <br /> concentrations are decreasing in the most heavily impacted wells, MW-2 and MW-4, and <br /> are staying fairly constant in the less heavily impacted peripheral wells. <br /> The influent vapor sample collected prior to remediation in the SVE system was reported <br /> to contain 1,600 micrograms per liter total petroleum hydrocarbons as gasoline (TPHg). <br /> The estimated recovery of contamination from this system was reported to be averaging <br /> 50.9 gallons TPHg per month. The report states that the SVE/AS system was de- <br /> activated on October 28, 2002. <br /> The report recommends replacement of the SVE carbon canisters and continued <br /> operation of the SVE/AS system. SJC/EHD agrees with this recommendation. It is <br /> apparent from the analytical data that the SVE/AS system has been and continues to be <br /> doing an effective job recovering petroleum hydrocarbons from the subsurface. <br /> Operation of this system must continue until it has reached an ineffective asymptotic <br /> state in its ability to recover contaminants. Please resume operation of the SVE/AS <br /> system immediately. <br /> Routine quarterly groundwater monitoring and sampling must continue at this site until <br /> directed otherwise by this agency, and must include all wells. Analysis for TPH as diesel <br /> should be performed on the water samples collected from MW-2, MW-4 and MW-7 at <br />