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California 1 _gional Water Quality Cont ' Board <br /> Central Valley Region <br /> r <br /> Karl E. Longley.ScD, P.E.,Chair _ <br /> Linda S. Adams Arnold <br /> t, Sacramento Main Office <br /> 11020 Sun Center Drive#200. Rancho l'ordma.California 95670-61 14 Sch%iarzenegger <br /> nw , n,rnt,lh Governor <br /> rwrcm�n PhAX <br /> Phone 1916)464-3291 •1 19161 464-464 f� <br /> �r I L <br /> http:/,���ww_waterboards ca eoN,centrakalley �l )1 <br /> 12 March 2007 MAR `s 2007 ►�J <br /> EiVviRoivh^rr� <br /> Sara Lee Bakeries Group, Inc. Mr. Edward Overton ALTH <br /> PERrf1IT,SER�iIc- <br /> 3500 Lacey Rd. 1320 S. Van Buren St. <br /> Downers Grove, IL 60515 Stockton, CA 95206 <br /> DOCUMENT REVIEW AND WORKPLAN APPROVAL, FORMER COLUMBO/TOSCANA <br /> BAKERIES. 1444 S. LINCOLN STREET, STOCKTON, SAN JOAQUIN COUNTY <br /> (Site, Figure 1) (REv10NAL B(_­)AF<D CASE # 3008251 <br /> 1 reviewed the Quarterly Groundwater Monitoring Report, First Quarter— January 2007 <br /> .(Report) and the Soil and Groundwater Investigation Work Plan (Workplan), received <br /> 9 March 2007 from the Sara Lee Bakeries Group, Inc. (Sara Lee) and their consultant, PSC <br /> Environmental Services Inc (PSE), and sub-consultant ETIC Engineering (ETIC). <br /> The Report provides the results of the quarterly monitoring for your site (Enclosed Figure 4A). <br /> Four monitoring wells (MW-1, MW-7S, MW-7D, and VE-1) were sampled in <br /> January 2007. ETIC did not analyze the VE-1 groundwater sample; instead, 0.2 inches of free <br /> phase liquid (FPL) was measured and approximately 500 milliliters of FPL was removed, prior <br /> to inserting an absorbent sock into the well. Maximum groundwater sample analytical results <br /> were: total petroleum hydrocarbons as gasoline, 32,000 micrograms per liter (ug/L); benzene, <br /> 12,000 ug/L; toluene, 420 ug/L; ethylbenzene, 620 ug/L; xylenes, 1,000 ug/L; MtBE, 170 ug/L; <br /> tertiary butyl alcohol, 9.3 ug/L; and 1,2-dichlorethane, 0.52 ug/L. Two additional wells (MW-8 <br /> and MW-14) on your site are owned and sampled quarterly by the adjacent Former Texaco, <br /> 440 W. Charter Way, for their investigation. The Report recommends monthly monitoring of <br /> free phase product and fluid hand bailing/absorbent sock replacement until conditions warrant <br /> resumption of quarterly groundwater monitoring for VE-1. I concur to this recommendation. <br /> In a letter (Letter) from Regional Water Quality Control Board staff (Staff) dated <br /> 8 January 2007, your request for an extension for the due dates of the Workplan and a report <br /> of the investigation were granted. The Letter requested that, pending Staff approval of the <br /> Workplan, the report of the investigation would be due 28 May 2007. The Workplan proposes <br /> the installation of ten direct-push soil and grab groundwater sampling locations (Enclosed <br /> Figure 4B). The subsequent report will evaluate the data and propose locations for additional <br /> shallow groundwater monitoring wells in a Workplan Addendum, as needed. <br /> California Environmental Protection Agenc , <br /> �a /?,C I L 1Cd MI[W) <br />