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California Igional Water Quality Contr0oard <br /> Central Valley Region i s_ <br /> Karl C.Longley,SCD,P.E.,Chair <br /> Linda S.Adams <br /> Secrewy/or Sacramento Main office Arnold <br /> F.nOwnrnenkd 11020 Sun Center Drive 9200,Rancho Cordova,California 956706114 Schwarnnegger <br /> Prolecrlor Phone(916)464-3291 •FAX(916)464.4645 Governor <br /> liltp:llxvww,%vitterboards.co.goy/celitrtlivillicy <br /> 15 May 2008 <br /> Mr. Dan Schreiner, P.G. <br /> Stantec <br /> 3017 Kilgore Road, Suite 100 <br /> Rancho Cordova, CA 95670 <br /> APPROVAL OF WORK PLAN, L & M OPERABLE UNIT,SAN JOA QUIN COUNTY <br /> Staff of Region 5 Water Quality Control Board has reviewed your submittal entitled Work <br /> Plan for Additional Deeper Zone Assessment prepared by SECOR International on behalf <br /> of the L&M Group dated 14 March 2008. The work plan was prepared in response to the <br /> Board's request for additional characterization at the site. The work plan proposes the <br /> installation of 17 intermediate and deep zone groundwater monitoring wells throughout the <br /> areas of the L&M OU, Unocal OU, Delta View Apartments, and Waterfront Towers. The <br /> proposed deeper wells are clustered near existing shallow zone wells. Samples taken from <br /> wells will be analyzed for TPHd/o, TPHg, BTEX, VOCs, SVOCs, and dissolved metals. <br /> Results will be shown in quarterly monitoring reports per existing MRP. <br /> Staff concurs with the work plan however, close coordination between Stantec, RDA, and <br /> Water Board is necessary during well construction. For example, proposed deep wells <br /> near existing MW-08 (Figure 3) will need to be installed in another location as preliminary <br /> development plans (Proposed Site Plan) show a future building to be constructed there. <br /> Based on existing RDA development plans, other proposed wells may need to be shifted <br /> from their mapped location. In the next four weeks, Water Board staff will <br /> coordinate/facilitate a meeting with Stantec, RDA (and their consultants), and ourselves to <br /> initiate framework for future work in the Redevelopment Area. <br /> Please contact me with all questions and concerns at 916.464.4682 or <br /> rcervantes@waterboards.ca.gov <br /> Roberto Cervantes <br /> Water Resources Control Engineer <br /> Site Cleanup Unit <br /> cc: Mr. Eric Hetrick, ConocoPhillips <br /> Mr. Derrick Vallance, ConocoPhillips <br /> Mr. Rick Rittenberg, Chevron EMC ��� MAY 1 9 ?ppg <br /> California Environmental Protection Agency <br />