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California Regional Water Quality Control Board <br /> Central Valley Region <br /> Robert Schneider Chair ���1`V��V <br /> (0 <br /> Winston H.Hickox ' Gray Davis <br /> Secretaryfor Sacramento Main Office Governor <br /> Environmental Internet Address: http://www.swrcb.ca.gov/mgcb5 <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 Q� 0 <br /> Phone(916)255-3000•FAX(916)255-3015 ENPIER1�11�E5ER���GESN <br /> 7 January 2003 <br /> Mr. Trenton Norris Mr. W.T. Nickerson <br /> Bingham McCutchen LLP Unocal Corporation <br /> 3 Embarcadero Center 8788 Elk Grove Blvd., Building 3, Suite 15 <br /> San Francisco, CA 94111 Elk Grove, CA 95624 <br /> REVIEW OF WORK PLAN AND MONITORING REPORT, SOUTH SHORE <br /> PARCELS, MORTON& UNOCAL OPERABLE UNITS, STOCKTON, SAN JOAQUIN <br /> COUNTY <br /> We have reviewed the 1 November 2002 Quarterly Monitoring Report(QMR) and the <br /> 23 December 2002 Well installation Workplan (Work Plan) submitted by Clayton Group <br /> Services on behalf of Alco Industries and Unocal Corporation for the portion of the South Shore <br /> Parcels managed by the Morton and Unocal Operable Units (OUs). The QMR discusses <br /> groundwater monitoring activities conducted in September. The Work Plan proposes to install <br /> five monitoring wells and abandon one monitoring well that is damaged. Four of the proposed <br /> monitoring wells are to delineate the lateral extent of pollution, and the other monitoring well is <br /> to replace the abandoned well. The Department of Toxic Substances Control (DTSC) also has <br /> reviewed the Work Plan. <br /> Board and DTSC staff have the following comments on the Work Plan: <br /> 1. In Sections 5.1.3 and 5.1.6, the Work Plan proposes to sample for"tri-amyl ether" and <br /> "tri butyl alcohol." The fuel oxygenates required in the Monitoring and Reporting <br /> Program are tertiary amyl methyl ether and tertiary butyl alcohol. <br /> 2. Section 4.0 of the Work Plan should identify Figures 4, 5, and 6,not 7. <br /> 3. Based on the estimated plume extent shown in Figures 4 and 5, the proposed boring to the <br /> northeast will not adequately delineate the plume extent to the north and northwest. <br /> Morton and Unocal OUs need to propose an additional monitoring well location to <br /> delineate the extent of pollution beyond monitoring well 2AMW-13 <br /> California Environmental Protection Agency <br /> co Recycled Paper <br /> The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. <br /> For a list of simple ways you can reduce demand and cut your energy costs,see our Web-site at http://www.swrcb.ca.gov/rwgcb5 <br />