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THOMAS R.FLINN P.O.BOX 1810-1810 E.NAZELTON AVENUE DIRECTORSTOCKTON,CALIFORNIA 88201 (209)488-3000 FAX(209)488-2999 �d Y www.co.san-joaqufn.ca.us THOMAS M.GAU CHIEF DEPUTY DIRECTOR 4%L MANUEL SOLORIO w YOU DEPUTY DIRECTOR STEVEN WINKLER DEPUTY DIRECTOR ROGER JANES BUSINESS ADMINISTRATOR April 12, 2007 Mr. Todd Del Frate, PG California Regional Water Quality Control Board 11020 Sun Center Drive, #200 Rancho Cordova, California 95670 SUBJECT: FIRST QUARTER 2007 GROUNDWATER AND SURFACE WATER MONITORING, HARNEY LANE SANITARY LANDFILL Dear Mr. Del Frate: Enclosed is the First Quarter 2007 Monitoring Report for the Harney Lane Sanitary Landfill, submitted in compliance with current WDRs. No general parameter tolerance limits were exceeded in any of the wells this quarter. This quarter we see a decreasing trend for Chlorides and turbidity at the impacted well MW-2, and no longer see a trend for electrical conductivity. I believe this indicates an improvement of water quality at this well for "inorganic" parameters. However, the three VOCs, which were previously detected at low concentrations in well -2, continue to be detected this quarter. No VOCs were reported in the other wells. Although it appears that corrective action at MW-2 is successful inreventin further p g degradation of groundwater quality, we are not satisfied with the progress of the corrective action. Therefore, we propose to increase corrective action against the VOC impact by installing at least two gas extraction wells, designed to collect gas from the soil beneath the landfill, in the general vicinity of MW-2 (Figure 1-1 attached). This would be the first step in a program of gradually increasing corrective action at this site if needed. Additional wells could be added, possibly each year, depending on the quarterly groundwater monitoring results. It is our understanding from our consultant that this general approach has been effective at at least one other site. 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. Progress of corrective action against VOC impact at W-2 is included this quarter.