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<br /> <br /> <br />1810 East Hazelton Avenue | Stockton, California 95205 | T 209 468 3000 | F 209 468 2999 <br />Follow us on Facebook @ PublicWorksSJC Visit our website: www.sjgov.org/pubworks <br /> <br />Department of Public Works <br /> <br />Fritz Buchman, Director <br />Alex Chetley, Deputy Director - Development <br />Kristi Rhea, Deputy Director - Administration <br />David Tolliver, Deputy Director - Operations <br /> Najee Zarif, Deputy Director - Engineering <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />January 27, 2025 <br /> <br />Mr. Todd Del Frate, PG <br />Engineering Geologist <br />Central Valley California Regional Water Quality Control Board <br />11020 Sun Center Drive, #200 <br />Rancho Cordova, California 95670-6114 <br /> <br />SUBJECT: FOURTH QUARTER AND ANNUAL 2024 GROUNDWATER MONITORING <br />REPORT <br />CORRAL HOLLOW SANITARY LANDFILL <br /> <br />Dear Mr. Del Frate: <br /> <br />Enclosed, please find the Fourth Quarter and Annual 2024 Groundwater Monitoring Report for <br />the Corral Hollow Sanitary Landfill. The landfill was monitored in accordance with Waste <br />Discharge Requirements R5 2013-0013. <br />The monitoring results are consistent with previous monitoring periods. Trend analysis of all <br />constituents was completed utilizing the Sanitas Statistical software. Trends identified as <br />Significant Increases (Incr) or Decreases (Decr) are summarized in the table following the brief <br />updates provided for each well. <br />Shallow Aquifer <br />After 50 monitoring events, the data indicates a continuing decreasing VOC plume beyond the <br />landfill property. Downgradient VOC detections are still significantly reduced from initial <br />detections. <br />SB-1 – Concentrations of the general water quality parameters were within the established <br />concentration limits. No VOCs were reported this quarter. VOCs have not been reported <br />regularly in this well since the second quarter of 2004. No "significant" trends were reported. <br />MW-4 – Concentrations of the general water quality parameters were within the established <br />concentration limits. No VOCs were reported. “Significantly decreasing” trends were reported for <br />turbidity, calcium, magnesium, potassium, bicarbonate alkalinity, chloride, nitrate as nitrogen, <br />sulfate and TDS. <br />MW-5 – Concentrations of the general water quality parameters were within the established <br />concentration limits. “Significantly increasing” trends were reported for chloride and TDS. <br />Eight (8) VOCs were reported this quarter; five (5) above the PQL, and three (3) at trace <br />concentrations below the PQL. Results from this well are consistent with previous monitoring <br />results. Trend analysis of VOC concentrations indicated a “significantly decreasing” trend for