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<br />North County Recycling Center & Sanitary Landfill Public Works/Solid Waste <br />First Semiannual 2024 Groundwater Monitoring 1 ©2024 COUNTY of San Joaquin. All Rights Reserved. <br /> <br />INTRODUCTION <br />General <br />This groundwater monitoring report for the North County Recycling Center and Sanitary Landfill <br />(NCRC&SL) is submitted in compliance with Waste Discharge Requirements (WDR) and <br />Monitoring and Reporting Program (MRP) Order No. R5-2010-0016. <br />The NCRC&SL is located at 17720 East Harney Lane, approximately nine (9) miles east of Lodi <br />(Figure 1). Land uses within 1,000 feet of the facility are primarily agricultural and livestock <br />grazing. The average precipitation near the landfill is 17.5 inches per year. <br />The NCRC&SL is a single solid waste management unit, designated Class III, accepting non- <br />hazardous municipal solid waste and inert waste, as defined in §20164 of Title 27. The site is <br />185 acres in area, comprised of lined areas (previously designated “modules”), each constructed <br />on an as-needed basis. The total capacity of the landfill is 41.2 million cubic yards. The rate of <br />disposal during the reporting period was less than 24,000 tons per month (Table 1). <br /> <br />TABLE 1 <br />First Semiannual 2024 Monthly Refuse Disposal <br />North County Recycling Center and Sanitary Landfill <br /> <br />Month Refuse Disposal <br />(Tons) <br />January 19,323.9 <br />February 20,669.2 <br />March 21,038.0 <br />April 23,582.1 <br />May 20,227.8 <br />June 18,167.2 <br /> <br />Geology <br />The sediments underlying the NCRC&SL consist of inter-bedded sands, silts and clays with <br />occasional gravelly layers. The measured hydraulic conductivity of the unsaturated zone soils is <br />between 1 x 10-4 and 2 x 10-7 centimeters/second. <br />The first encountered groundwater is from 165 to 185 feet below ground surface. Groundwater <br />elevations range from -50 to -70 feet National American Vertical Datum of 1988 (NAVD 88), <br />fluctuating seasonally approximately 6 feet. The groundwater is unconfined. <br />Construction <br />Details of construction are contained in the WDRs for this site. Lined Area 1 (previously <br />designated “Modules 1 and 2”) was constructed in 1991 (Figure 2). This area was excavated to