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Californi egional Water Quality Cool Board <br /> Central Valley Region <br /> Linda S.Adams �— Arnold <br /> Secreroryjor Sacramento Main Office ftte – � Schwarzenegger <br /> Fm ironmental 11020 Sun Center Drive#200.Rancho Cordova,California 95670-6114 Governor <br /> Protection Phone(916)464-3291 •FAX(916)464-4645 �i <br /> h 1p.//www.waterboards.ca.gov/cennJAN AN 1 9 2007 <br /> 18 January2007 ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br /> Mr. Don Pratt, Environmental Business Manager Mr. Gurpreet and Ms. Kuldeep Dhat <br /> Atlantic Richfield Company 501 S. Cherokee Avenue <br /> P.O. Box 1257 Lodi 35240 <br /> San Ramon 94583 <br /> WORK PLAN ADDENDUM APPROVAL, ARCO #0760, 225 S. CHEROKEE LANE, LODI, <br /> SAN JOAQUIN COUNTY (REGIONAL BOARD CASE # 390330) <br /> In a letter (Letter) dated 21 December 2006, California Regional Water Quality Control Board <br /> — Central Valley Region (Regional Board) staff conditionally approved the Work Plan for Soil <br /> and Groundwater Investigation and Soil Vapor Survey received from your consultant Secor <br /> International Incorporated (Secor), and requested a workplan addendum by 12 January 2007 <br /> to continue the Site characterization for all petroleum hydrocarbons, including 1,2- <br /> Dichloroethane (1,2-DCA). On 12 January 2007, Regional Board staff received the <br /> Addendum to the Work Plan for Soil and Groundwater Investigation and Soil Vapor Survey <br /> (Workplan Addendum) from Secor. The Workplan Addendum supplements the Workplan and <br /> proposes the installation off one additional shallow groundwater monitoring well (MW-9) on the <br /> southeastern corner of Cherokee Lane and Lodi Avenue and one additional vapor probe near <br /> the residence immediately west of your Site (enclosed Figure 2). <br /> The Workplan Addendum is necessary and appropriate, and is approved. The report of the <br /> investigation is now due 28 February 2007. Please acquire the appropriate permits and <br /> provide San Joaquin County and myself at least three working days notice prior to <br /> commencing fieldwork. <br /> If ou have any quest—isonns, please call me at (916) 464-4615. <br /> �ne�,7C <br /> ames L. L. Barton, P.G. <br /> Engineering Geologist <br /> Enclosure <br /> cc: Ms. Jennifer Jordan, LOP Contract Manager, State Water Resources Control Board, <br /> Sacramento <br /> Mr. Mark Owens, UST Cleanup Fund, State Water Resources Control Board, <br /> Sacramento <br /> Ms. Margaret Lagorio, San Joaquin County Environmental Health Department, Stockton <br /> Ms. Kristen Shelton, SECOR International, Inc., 3017 Kilgore Road, Suite 100, <br /> Rancho Cordova 95670 <br /> California Environmental Protection Agency <br /> Qd Regrled Paper <br />