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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 />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 29, 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: Second Semiannual and Annual 2024 Groundwater and Surface Water <br />Monitoring Report, Foothill Sanitary Landfill <br /> <br />Mr. Del Frate, <br />Enclosed is the Second Semiannual and Annual 2024 Groundwater and Surface Water <br />Monitoring Report for the Foothill Sanitary Landfill, submitted in accordance with WDR No. R5- <br />2015-0058. <br />Wells MW-3, MW-5, MW-7R, and surface water locations were either dry or had insufficient <br />water present and therefore no sampling took place at these locations during the second <br />semiannual period. Sampling in the remaining five wells was conducted during August 2024 and <br />a summary of the findings for the second semiannual period are provided below. <br />• MW-1A – The CL for turbidity was exceed; turbidity was within historical range. <br />• MW-2R – There were no exceedances during the second semiannual period of 2024. <br />• MW-4A – There were no exceedances during the second semiannual period of 2024. <br />• MW-6 – The CL for sodium was exceeded; the concentration was within historical range. <br />• MW-7 – The CLs were exceeded for sodium, potassium, and sulfate; the concentrations <br />were reported within historical ranges. <br /> <br />Although some concentrations exceeded the CLs, they are still within the range of historical <br />data. Monitoring constituents were consistent with previous monitoring periods. <br /> <br />All four lysimeters were dry or had insufficient water present to sample during the first and <br />second semiannual monitoring events. <br />