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e California e io l Water Quality Control Board j. RE Central Valley Region Robert Schneider,Chair Winston H. Hickox Gray Davis Secretary for Sacramento Main Office Governor Environmental Internet Address: http://N�ww.swrcb.ca.gov/rwgcb5 Pro[ection 3443 Routier Road.Suite A,Sacramento,California 95827-3003 Phone(916)255-3000•FAX(916)255-3015 t�� 24 June 2002 v W. Michael Carroll San Joaquin County Dept. of Public Works ,® Solid Waste Division -4 P.O. Box 1810 Stockton, CA 95201 REVIE IV OFFOURTH QUARTER/ANNUAL 2001 MONITORING REPORT, CORRAL HOLLOW SANITARYLANDFILL, SANJOAQUIN COUNTY(CASE NO. 1896) We have reviewed the Corral Hollow Sanitary Landfill, Fourth Quarter/Annual 2001, Groundwater and Surface Water Monitoring Report, dated 30 January 2001. MW-5 Analysis and Landfill Gas Extraction System T ual monitoring report indicates increasing trends in EC, TDS, chloride, PCE and vinyl chloride i W-5 as well as decreasing trends in pH, acetone, chloromethane, and dichloroflouromethane. The gas colle'c'tion system has been operating since 1 June 2001, one year. The County states that the system "is currently operating." A compliance evaluation study must be included in order to determine the effectiveness of the corrective action system (gas collection) in accordance with WDRs Order No. 5-01- 176 F.6.c. Reporting Requirements which state, "A comprehensive discussion of the compliance record, and the result of any corrective actions taken or planned which may be needed to bring the Discharger into full compliance with the waste discharge requirements." The Landfill Gas Extraction System has been operating for one year and VOCs continue to impact groundwater sampled from MW-5. There is no discussion regarding the Landfill Gas Extraction System regarding mass removal rates, sampling of gases, results of sampling(e.g., constituent concentrations), amount of gas condensate and where it is disposed, operational history of the system,map of the system, and whether the system is effectively, functioning. The County must address the effectiveness of the Landfill Gas Extraction System by 1 October 2002 as an addendum to the 2001 Annual report and ensure that subsequent monitoring reports include an update. MW-4 Analysis Increasing trends were found for nitrate and EC in MW-4. Therefore,tolerance limits were not updated for these parameters this quarter. As noted on page 7-2 of the CAP, an increasing trend in nitrate- nitrogen may be used to prove that corrective action activities are effective. The County must elaborate on these types of compliance statements in the quarterly and annual reports. California Environmental Protection Agency Qa Recycled Paper The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. For a list of simple ways you can reduce demand and cut your energy costs,see our Web-site at httpJ/www.swrcb.ca.gov/rwgcb5