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r.' x THOMAS R.FLINN P.O.BOX 1810-1810 E.HAZELTON AVENUE DIRECTOR - STOCKTON,CALIFORNIA 95201 - r (209)468-3000 FAX(209)468-2999 i www.sjgov.org1pubworks THOMAS M.GAU CHIEF DEPUTY DIRECTOR wmidng for YOU MANUEL SOLORIO DEPUTY DIRECTOR STEVEN WINKLER DEPUTY DIRECTOR ROGERJANES BUSINESS ADMINISTRATOR July 12, 2007 Mr. Todd Del Frate, PG California Regional Water Quality Control Board 11020 Sun Center Drive, #200 Rancho Cordova, California 95670 SUBJECT: SECOND QUARTER 2007 GROUNDWATER AND SURFACE WATER MONITORING, HARNEY LANE SANITARY LANDFILL Dear Mr. Del Frate: Enclosed is the Second 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. 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. We also note a change in the direction of groundwater flow, with groundwater flow apparently northwest to southeast. No activity at our site could cause this change. Our statistical analysis software (Sanitas) identifies an increasing trend for Chlorides and turbidity at the impacted well MW-2 this quarter, whereas last quarter the software identified a decreasing trend in Chlorides and no trend in turbidity. This demonstrates the very slight "trends" that the analysis software identifies. Only two VOCs were reported in MW-2 this quarter, both at concentrations less than 2 ppb. Three VOCs have been reported for the past two years. Perhaps this indicates a slow improvement due to our remediation. No VOCs were reported in the other wells. No parameters were found in any of the Quality Control Blanks this quarter. Progress of corrective action against VOC impact at MW-2 is included in the first and third quarterly reports, and therefore is not included this quarter.