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STATE OF CALIFORNIA <br />c <br />CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br />CENTRAL VALLEY REGION <br />3443 ROUTIER ROAD, SUITE A <br />SACRAMENTO, CA 95827-3098 <br />27 September 1990 <br />Ms. Patricia Sullivan <br />Environmental Services <br />Pacific Gas and Electric Company <br />P.O. Box 7640 <br />San Francisco, CA 94120 <br />GEORGE DEUKMEJIAN, Governor <br />gh�gou..m w`� <br />CT <br />PG&E's MCDONALD ISLAND STJFACE IMPOUhNDivlElr'TS, SATN JOAQUIN COUNTY <br />(Case No. 2288) <br />We have reviewed the solid waste water quality assessment (SWAT) report for the disposal ponds <br />at PG&E's McDonald Island Gas Storage Field. The report adequately demonstrated that hazar- <br />dous waste is not leaking from the impoundments. The SWAT report data show, however, that <br />nonhazardous chemical concentrations in ground water vary greatly across the site and may be <br />indicative of leakage from the impoundments. These contaminants need to be defined in the <br />following areas: <br />source,I What is the . extent of ground water contamination. does it impact <br />surface water? <br />2. How will contaminated ground water be remediated? <br />3. What steps will be taken to prevent future degradaton of the ground water and close the <br />impoundments? <br />Please submit a workplan and time schedule for the above work by 1 January 1991. If you <br />have any questions, please call Steve Rosenbaum at (916) 361-5732. <br />WILLIAI�'J. MARSHALL, Chief <br />Waste Discharge to Land Unit <br />M <br />cc: Ms. Kim Schwab, California Integrated Waste Management Board, Sacramento <br />Mr. Ed Padilla, San Joaquin County Public Health Services, Stockton <br />