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OP4u'� C <br />2' <br />P: 21 <br />W' f < <br />Cr �P <br />'4<iFo Q' <br />THOMAS M. GAU <br />CHIEF DEPUTY DIRECTOR <br />MANUEL SOLORIO <br />DEPUTY DIRECTOR <br />STEVEN WINKLER <br />DEPUTY DIRECTOR <br />ROGERJANES <br />BUSINESS ADMINISTRATOR <br />THOMAS R. FLINN <br />DIRECTOR <br />\\\\, voa. <br />IN 19 <br />\x <br />�,r% \ . <br />pq "6 A �. <br />April 25, 2009 <br />Mr. Todd Del Frate <br />California Regional Water Quality Control Board <br />11020 Sun Center Drive, #200 <br />Rancho Cordova, California 95670-6114 <br />P. O. BOX 1810 -1810 E. HAZELTON AVENUE <br />STOCKTON, CALIFORNIA 95201 <br />(209) 468-3000 FAX (209) 468-2999 <br />www.sjgov.org/pubworks <br />SUBJECT: FIRST QUARTER 2009 GROUNDWATER MONITORING REPORT, <br />CORRAL HOLLOW SANITARY LANDFILL <br />Dear Mr. Del Frate: <br />Enclosed please find the First Quarter 2009 Groundwater and Surface Water Monitoring Report <br />for the Corral Hollow Sanitary Landfill. Monitoring was performed in accordance with the <br />monitoring program included with the Waste Discharge Requirements (WDRs) approved by the <br />Regional Water Quality Control Board for this site. Concentrations of parameters in all wells were <br />within established concentration limits. <br />Groundwater conditions remain consistent with those of the previous year. Eight VOCs were <br />reported in impacted well MW -5, three in "trace" concentrations, none above 10 ppb. Five VOCs <br />were reported in well MW -8, one in trace concentration. All VOCs in MW -8 were also found in <br />MW -5, but at lower concentration. This distinct concentration gradient indicates that the origin of <br />LFG impact is the refuse at the northern corner of the landfill where the influence of the LFG <br />system is minimal, and not from the landfill in general. <br />Five additional LFG wells were installed in the north-eastern portion of the landfill to collect LFG <br />from the northern corner of the landfill in December 2008. The samples for this quarter were <br />taken soon after those LFG wells were installed, so I am not surprised that we do not see <br />changes in groundwater quality this quarter. <br />No VOCs were reported at shallow aquifer wells SB -1 or MW -4, or at any deep aquifer well. <br />TO -14 analyses of soil gas are included, along with concentrations of major gasses (02, CO2, <br />CH4, and N2) per your request. <br />No general water quality concentration limits were exceeded in wells MW -6, MW -7 and MW -8 this <br />quarter. The Groundwater parameters Bicarbonate Alkalinity, but not Total Dissolved Solids <br />(TDS), were exceeded in MW -4 this quarter. Groundwater parameters Alkalinity as CaCO3, and <br />Bicarbonate Alkalinity were exceeded in MW -5. Based on the review of the data, there does not <br />seem to be not consistent evidence of worsening water quality at the landfill. <br />Progress of Corrective Action Measures is submitted during the first and third quarters, and is <br />therefore included in this quarterly report. Monitoring data indicates significant improvement in <br />