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California Regional Water Quality Control Board <br /> Central Valley Region <br /> Winston H.Hickox Robert Schneider,Chair <br /> Gray Davis <br /> Secretary for Sacramento Main Office Governor <br /> Environmental Internet Address: http://www.swrcb.ca.gov/rwgcb5 <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)255-3000•FAX(916)255-3015 no <br /> 1 August 2002 �', �+���® <br /> B. D. Davis <br /> a()r, 0 � 2002 <br /> Pacific Gas and Electric Company ENvaiui•wii_-dI HEALTH <br /> 375 North Wiget Lane, Suite 250 PEAMi I/SERVICES <br /> Walnut Creek, CA 94598-2412 <br /> .REVIEW OF OCTOBER SEMI-ANNUAL GROUNDWATER MONITORING REPORT AND <br /> ANNUAL YEAR 2001 REPORT FOR FORMER CLASS II SURFACE IMPOUNDMENTS,PG&E <br /> McDONALD ISLAND GAS STORAGE FACILITY, MCD ONALD ISLAND, SAN JOA QUIN <br /> COUNTY(Case File No. 2288) <br /> Regional Board staff has reviewed the above referenced report, dated January 2002. We find that the <br /> report is complete as shown on the attached Monitoring Report Compliance Checklist. In summary, the <br /> report states that there are slight upward trends for Cl,Na, TDS &EC in MW-2 and Ba in MW-5. <br /> Constituents of concern are greater than background in MW-1RD,MW-2, -3, -5, -6, -9 and—11. Mann- <br /> Kendall trend analysis shows increasing trends in MW-2 and MW-5. The report states, "As the source <br /> has been removed, concentrations appear to be gradually decreasing over time due to dilution and <br /> groundwater recharge. The concentrations of elevated inorganics are expected to continue to decline <br /> over time." <br /> We note your request to revise Monitoring and Reporting Program Order No. 96-176 in order to change <br /> semi-annual monitoring to be reduced to annual monitoring with an April sampling event. Because of <br /> the increasing trends in MW-2 and MW-5,we recommend further semi-annual sampling until all <br /> concentrations of constituents of concern show a decreasing trend over time, at a minimum. <br /> If you have any questions,please contact me at (916) 255-3137 or schwabk@rb5s.swrcb.ca.gov. <br /> KIM A. SCHWAB, R.G. <br /> Associate Engineering Geologist <br /> Attachment <br /> cc: Director, San Joaquin County Environmental Health Division, Stockton <br /> California Environmental Protection Agency <br /> 00 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 />