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c THOMAS M.GAU P.O.BOX 1810-1810 E.HAZELTON AVENUE <br /> DIRECTOR STOCKTON,CALIFORNIA 06201 <br /> (209)468-3000 FAX(209)468-2999 <br /> www.sjgov.org/pubworks <br /> FRITZ BUCHMAN <br /> DEPUTY DIRECTOR Wmmng for YOU <br /> MICHAEL SELLING <br /> DEPUTY DIRECTOR <br /> JIM STONE <br /> DEPUTY DIRECTOR <br /> ROGER JANES q <br /> BUSINESS ADMINISTRATOR July 24, 2013 <br /> Mr. Todd Del Frate, PG <br /> California Regional Water Quality Control Board <br /> 11020 Sun Center Drive, #200 <br /> Rancho Cordova, CA 95670 <br /> SUBJECT: FIRST SEMESTER 2013 GROUNDWATER AND SURFACE WATER <br /> MONITORING, HARNEY LANE SANITARY LANDFILL <br /> Dear Mr. Del Frate: <br /> Enclosed is the First Semester 2013 Groundwater and Surface Water Monitoring Report <br /> for the closed Harney Lane Sanitary Landfill, submitted in compliance with current <br /> Waste Discharge Requirements. <br /> I am pleased to report that VOCs associated with landfill gas were detected only at <br /> trace concentrations. This is a significant improvement over previous years, in which <br /> several compounds were reported and in concentrations above 1 ppb. This <br /> improvement indicates success in the corrective action at the site, and that additional <br /> landfill gas wells are not needed at this time. <br /> However, low concentrations of other VOCs, characterized as BTEX, were reported at <br /> well MW-4. We are unsure what to conclude from this. No activity on the landfill could <br /> cause these detections. Because this is a cross-gradient well, it is possible we are <br /> seeing the effect of activity off-site. <br /> Data from recently-installed MW-5 and -6 continue to indicate that the off-site <br /> wastewater treatment ponds north of our "secondary site" have an effect on the <br /> groundwater; however, this effect seems to be minor and dissipates as the groundwater <br /> moves onto our site to reach MW-4. <br /> Sanitas software indicates an increasing trend for turbidity and Bicarbonate Alkalinity at <br /> MW-3. However, these parameters appear to be within the range of previous <br /> monitoring data. Reporting a "significant increasing trend" with such small variation in <br /> data is an unfortunate feature of the Sanitas software. An increasing trend of <br /> conductivity at MW-2 is no longer reported. <br />