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THOMAS R. FLINN P.O.BOX 1810-1810 C.HAZELTON AVENUE DIRECTOR STOCKTON,CALIFORNIA 95201 (209)468-3000 FAX(209)468-2999 wwwco.sanjoaquin.ca.us THOMAS M.GAU DEPUTY DIRECTOR R R rpc Hyr, MANUEL SOLORIO warldmg for YOU DEPUTY DIRECTOR STEVEN WINKLER DEPUTY DIRECTOR JAN 0 4 2005 BENTON ANGOVE January 6, 2005 SAN JDA UI COUNTY BUSINESS ADMINISTRATOR ENVIRONMENTAL HEALTH I)EpT Ms. Kim Schwab California Regional Water Quality Control Board 11020 Sun Center Drive, #200 Rancho Cordova, California 95820-6114 SUBJECT: HARNEY LANE SANITARY LANDFILL, THIRD QUARTER 2004 GROUNDWATER AND SURFACE WATER MONITORING REPORT Dear Ms. Schwab: Enclosed is the Fourth Quarter 2004 Monitoring Report for the Harney Lane Sanitary Landfill, submitted in compliance with current WDRs, due January 15, 2005. Per your request, we have included data points in both the time-series plots and in the statistical evaluations that are identified by Sanitas as "outliers." The concentration of Chlorides has again decreased at upgradient well MW-1 this quarter, the cause of which is not apparent from data collected at the site. Chlorides at MW-2 have also decreased, remaining at a low concentration(25 ppm), although Sanitas indicates an increasing trend for Chlorides at this well. Two VOCs were found in well MW-1, which were not found in quality control blanks. This well was resampled on December 17, 2004. We note that this was the first quarter in over two years that this occurred. Three VOCs were found in well MW-2,but because this well has been previously impacted, and monitoring is under corrective action, it was not resampled. The additional surface drainage facilities on the Secondary site has, so far, prevented further sliding of soil from the top deck shoulder onto the landfill sideslopes. Significant new growth is seen on the recently seeded areas that were subject to sliding last year, as well as on the bum area of the Primary site. We expect that the site will be subject to much less erosion and drainage problems due to the drainage improvements this year, and the vegetative cover established on the top deck after seeding last year. This report includes results of the continuing investigation of the apparent connection between groundwater quality at groundwater well MW-4 and the wastewater pond at the migrant housing complex. So far, the data seems to support the idea that well MW-4 is affected by the ponds. However, we note that Section E-4 of the Monitoring and Reporting Program(attached) exempts MW-4 from compliance with regards to chloride, electrical conductivity, and total dissolved solids because MW-4 could easily be impacted by the ponds. It appears that the MRP recognized that the impact to the well by the ponds was expected. Given this exemption, we would suggest that this investigation could be discontinued.