CORRESPONDENCE_1999-2002 - Laserfiche WebLink

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California Regional Water Quality Control Board - Central Valley Region Robert Schneider,Chair Winston H.Hickox Gray Davis Secretary for Sacramento Main Office Governor Envirarunenta/ Internet Address: http://www.swrcb.ca.gov/rwgcb5 Protection 3443 Routier Road,Suite A.Sacramento,California 95827-3003 Phone(916)255-3000•FAX(916)255-3015 20 March 2001 Mr. Michael Kalish > County of San Joaquin ' Department of Public Works P.O. Box 1810 Stockton, CA 95201 REVIEW OF MONITORING REPORT,HARNEYLANE SANITAR Y LANDFILL, SAN JOA QUIN COUNTY(CASE NO.2598) Regional Board staff has reviewed the Harney Lane Sanitary Landfill, Fourth Quarter and Annual Report fol 2000, Groundwater and Sul face Water Monitoring Report, dated 15 January 2001. Repairs to the top deck of the east side of the landfill have been completed and the county will continue to monitor the deck in this area to ensure that the grading is sufficient to prevent ponding. Additionally, staff inspected the landfill on 18 January 2001 at which time you showed staff where new drains were installed on the west side of the landfill. These new drains are to enhance drainage from the top deck near an electrical box needed for the gas collection system. Monitoring for the Fourth Quarter 2000 and for the year is in compliance with the Waste Discharge Requirements (WDRs) Order No. 96-139. As noted in the Third Quarter review letter, the increasing trend of chloride in monitoring well MW-2 warrants observation. The county has statistically updated concentration limits for this well every quarter, however the concentration detected is still beneath the concentration noted in the Waste Discharge Requirements No. 96-139. It is also noted that bicarbonate M monitoring well MW-1, the well located at the upgradient boundary of the landfill, is increasing and specific conductance was significantly different from compliance data. The county will continue to monitor these parameters. Well MW-4 had a significant spike in nitrate as nitrogen concentration. This was not discussed in the main body of the report or in Appendix H, Annual Report. According to the time-series plot for this constituent, the detected value, 22.8 mg/1 is greater than any reported since May 1987. Please submit a written discussion of this detection by 15 April 2001. During the Fourth Quarter 1999,hexavalent chromium was detected in the groundwater. The county has conducted resampling as requested by the Regional Board. The results of the retest should be reported with the submittal of the First Quarter 2001 report by 15 April 2001, if not reported sooner. California Environmental Protection Agency �a 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 http://www.swrcb.ca.gov/rwgcb5