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<br /> <br />Foothill Sanitary Landfill Page 15 of 52 San Joaquin County DPW - Solid Waste <br />Joint Technical Document Revised 01/05/2026 <br /> <br />The site is about 1.5 miles south of the Calaveras River and 4 miles east of Mormon <br />Slough, which branches off from the Calaveras River near Bellota about 3.5 miles northwest of <br />the site. Surface drainage from the site flows into a network of streams and creeks that meander <br />toward the southwest, ultimately emptying into Mormon Slough at two points near Linden and <br />east Stockton, respectively. Mormon Slough is partially tributary to the Stockton Diverting Canal, <br />which drains into the Calaveras River, a tributary of the San Joaquin River. The remainder of <br />Mormon Slough flows directly into the San Joaquin River in Stockton (2015 WDR). <br /> <br />4.10.2.4. Springs <br /> There are no springs on the property. <br /> <br />4.10.3. Groundwater Quality <br />Background groundwater quality in the uppermost aquifer at the site is relatively good <br />including total dissolved solids (TDS) at about 210 mg/L, electrical conductivity at about 270 <br />mg/L, chloride at about 6 mg/L, sulfate at about 8 mg/L, and bicarbonate alkalinity at about 140 <br />mg/L (2015 WDR). <br /> <br />4.10.4. Groundwater Use <br />Groundwater use on and surrounding the property is typically for agricultural and <br />domestic use. <br /> <br /> <br />4.10.5. Groundwater Monitoring <br /> <br />Eight wells were identified within 1 mile of the landfill site. The screened sections of <br />these wells vary between bottom depths of 255 feet to as deep as 467 feet (Appendix H). One <br />off-site well appears to be down gradient, west-southwest of the site (review of California <br />Department of Water Resources files reported in “Report of Waste Discharge Related to the <br />Permitting and Installation of Composite Landfill Liner System for Module 1 and Future <br />Modules,” Emcon, 2002; and by Kleinfelder Inc, August 2004). <br />