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<br /> California ' gional Water Quality Con` I Board
<br /> Central Valley Region ,
<br /> Karl E. Longley,ScD, P.E.,Chair
<br /> Linda S. Adams Arnold
<br /> 5,- _, � Sacramento Main Office Schwar
<br /> ll lof! 11020 Sun Ccnter Dri%e 85670-6
<br /> 200. Rancho Cordova.California 9114 gger
<br /> un ucunrGorzenezene
<br /> emor
<br /> rurrcnul� Phone(916)464-3291 •FAX(916)464-4645
<br /> htip//N%%%x% %%aterboards.ca goN/centrahalRIECOVED
<br /> 29 May 2007
<br /> MAY 31 Y 2007
<br /> Mr. Matt Gabris ENVIRONMENT HEALTH
<br /> Sara Lee Bakery Group, Inc AERN!!!?/SERV!CES
<br /> 3500 Lacey Rd.
<br /> Downers Grove, IL 60515
<br /> WORKPLAN APPROVAL, FORMER COLUMBO/TOSCANA BAKERIES, 1444 S. LINCOLN STREET,
<br /> STOCKTON, SAN JOAQUIN COUNTY (REGIONAL BOARD CASE # 390825)
<br /> I reviewed the Soil and Groundwater Quality Investigation Work Plan Addendum (Workplan
<br /> Addendum), received electronically on 29 May 2007 from the Sara Lee Bakery Group, Inc.
<br /> (Sara Lee) and their consultant, PSC Environmental Services Inc. (PSC), and sub-consultant ETIC
<br /> Engineering (ETIC). The Workplan Addendum provides the soil and groundwater analytical results of
<br /> the direct push sampling conducted from 30 March 2007 to 1 April 2007. Maximum soil analytical
<br /> results were: total petroleum hydrocarbons as gasoline (TPHg), 5,500 milligrams per kilogram
<br /> (mg/kg)); benzene, 11 mg/kg; toluene, 160 mg/kg; ethylbenzene, 120 mg/kg; xylenes, 700 mg/kg;
<br /> Methyl tert-Butyl Ether (MtBE), 1.5 mg/kg; tertiary butyl alcohol (TBA), 0.23 mg/kg; and
<br /> 1,2-dichloroethane (1,2-DCA), 0.048 mg/kg. Maximum grab groundwater analytical results were:
<br /> TPHg, 400,000 micrograms per liter (ug/L); benzene, 26,000 ug/L; toluene, 51,000 ug/L; ethylbenzene,
<br /> 7.800 ug/L; xylenes. 38,000 ug/L; MtBE, 1,700 ug/L; TBA, 400 ug/L; and 1,2-DCA, 230 ug/L.
<br /> The Workplan Addendum proposes four additional monitoring wells (MW-1A through MW-4A,
<br /> Enclosed Figure 2) for your site, based on the data from the direct push sample results. I concur to
<br /> this recommendation. In conjunction with prior investigations conducted to date, the new monitoring
<br /> wells will provide additional characterization at your site, and are appropriate and necessary to define
<br /> the lateral extent of groundwater pollution emanating from your petroleum hydrocarbons release.
<br /> Please procure the appropriate drilling permits from the San Joaquin County Environmental Health
<br /> Department, and give both agencies, San Joaquin County and this Regional Board, at least 3 working
<br /> days notice prior to fieldwork. If you have any questions, please call me at (916) 464-4615 or email me
<br /> at jbarton@waterboards.ca.gov.
<br /> 612
<br /> James L. L. Barton, P.G.
<br /> Engineering Geologist
<br /> Enclosure
<br /> cc: Ms. Jennifer Jordan, State Water Resources Control Board, Sacramento
<br /> Ms. Margaret Lagorio, San Joaquin County Environmental Health Department, Stockton
<br /> Mr. Edward Overton, P.O. Box 417, French Camp 95231
<br /> Mr. Paul Anderson, PSC Environmental Services, 210 W. Sand Bank Rd., Columbia, IL 62236
<br /> Mr. Thomas Neely, ETIC Engineering Inc., 2285 Morello Ave., Pleasant Hills 94253
<br /> California Environmental Protection Agency
<br /> p�� Rerrc led Papel
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