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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 />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 />July , 2024 <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 <br />SUBJECT: FIRST SEMIANNUAL 2024 GROUNDWATER AND SURFACE WATER <br />MONITORING REPORT <br />NORTH COUNTY RECYCLING CENTER AND SANITARY LANDFILL <br />Dear Mr. Del Frate: <br />Enclosed is the First Semiannual 2024 Groundwater and Surface Water Monitoring Report for <br />the North County Recycling Center and Sanitary Landfill (NCRCSL), submitted in accordance <br />with Waste Discharge Requirements R5-2010-0016. <br />Below is a summary of the findings: <br />Detection monitoring wells on northern side of the landfill consist of G-7 and G-8. Detection <br />monitoring wells on western side of the landfill consist of G-5B, G-9, and G-13. Detection <br />monitoring well G-11 is on southern side of the landfill. Detection monitoring wells G-10 and G- <br />14 are on eastern side of the landfill. Monitoring well G-12 is the background well for statistical <br />evaluation. Samples were collected from wells G-7 through G-14 during first quarter 2024. <br />The groundwater elevations during the first and second quarters indicated that groundwater flow <br />was generally to the south-southeast and west, respectively. <br />VOCs were not reported in any of the monitoring wells that surround the landfill (G-7 through G- <br />14) during first quarter 2024. <br />Three lysimeters were sampled during the first semiannual 2024 period. VZ-01 and VZ-03A/B <br />were each sampled in February and March 2024. Both were dry in April 2024. VZ-06 was <br />sampled in February but was dry in March 2024. All other lysimeters were reported as dry <br />during the reporting period, indicating no detectable leaks from the liner in those areas during <br />the first semiannual 2024 period. Unsaturated zone monitoring will continue in accordance with <br />the WDRs.