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THOMAS R.FLINN P.O.BOX 1810-1810 E.HMLTON AVENUE DIRECTOR STOCKTON,CALF 1 • (208)488-3000 FAX(209)488-2999 www.sjgov.org/pubworks THOMAS M.GAU N CHIEF DEPUTY DIRECTOR MANUEL SOLORIO Rtfor YOU DEPUTY DIRECTOR STEVEN WINKLER DEPUTY DIRECTOR ROM JANES BUSINESS ADMINISTRATOR January 18, 2007 Mr. Todd Del Frate,PG California Regional Water Quality Control Board 11020 Sun Center Drive, #200 Rancho Cordova, California 95670 SUBJECT: FOURTH QUARTER AND ANNUAL 2006 GROUNDWATER AND SURFACE WATER MONITORING, HARNEY LANE SANITARY LANDFILL Dear Mr. Del Frate: Enclosed is the Fourth Quarter and Annual 2006 Monitoring Report for the Harney Lane Sanitary Landfill, submitted in compliance with current WDRs. We continue to see an increasing trend for electrical conductivity at the upgradient well (MW-1). This indicates a change of background water quality, which has been noted in past monitoring reports. Electrical Conductivity tolerance limits were exceeded in wells MW-1, MW-2, and MW-3 this quarter, with the highest concentration at the upgradient well. No general water quality parameters were exceeded in well MW-4 this quarter At the impacted well (MW-2), an increasing trend for electrical conductivity (EC) is seen this quarter; however, the EC of this well is less than that of the upgradient well, so this increase is expected. An increasing trend for Chlorides continues to be reported. Chloride concentration is well below the recommended secondary maximum contaminant level for drinking water(250 mg/1); therefore, we do not believe this is detrimental to the use of the waters of the state at this time. We will continue to closely monitor data from this well. Three VOCs were reported in MW-2 this quarter at concentrations less than 2 ppb. We believe that concentration less than 2 ppb is not a significant impact, and the concentrations of each of these three compounds have been higher in the past year than in this reporting period indicating moderate success in corrective action regarding VOC impact. To increase our corrective action, we have directed that the landfill gas collection in this area be increased, and expect that this will have a positive effect apparent in the second quarter monitoring.