COMPLIANCE INFO_AMENDED JTD 1/5/2026

Home Browse Search

Foothill Landfill Storm Water Pollution Prevention Plan Page 63 Table 12.3.1.A – Investigative Soil Samples Drainage Area Drainage Area Sample Location Iron Concentration ST-1 B (up-gradient) 20,300 mg/kg ST-1 C (at the discharge point) 19,700 mg/kg ST-1 A (down-gradient) 15,900 mg/kg ST-6 B (up-gradient) 22,700 mg/kg ST-6 C (at the discharge point) 21,300 mg/kg ST-6 A (down-gradient) 16,400 mg/kg ST-7 B (up-gradient) 27,800 mg/kg ST-7 C (at the discharge point) 18,900 mg/kg ST-7 A (down-gradient) 17,100 mg/kg On May 25, 2017 and on December 18, 2017, WGR’s QISPs performed pollutant source evaluations for iron and sediment. The following is a listing of the potential sources of iron. Table 12.3.1.B – Potential Internal Sources Generating Exceedances Parameters Exceeded Potential Source /Activity Generating the Iron NAL Exceedance Existing BMPs to Address the Source of Iron 2015/2016 Iron, total TSS Drainage Area for ST-3: x Operation of heavy earthmoving equipment x Excavation and movement of soil from the borrow area to be used for daily cover. x Soils with elevated iron concentrations x Areas of inactive disturbed soils are allowed to vegetate x Active areas of soil disturbance are track walked x Sedimentation basin is located upstream of the ST-3 discharge point 2016/2017 Iron, total Drainage Areas for ST-1, ST-6, and ST-7: x Minor amount of industrial activities (e- waste receiving, “bone yard” for tires and misc. parts, and storage of small amounts of maintenance related hazardous materials in an enclosed shed) near the scale house (ST-6 only) x Soils with elevated iron concentrations x Drainage areas for ST-1 and ST-7 are exclusively non- industrial x Drainage area is vegetated and in a natural state x Fiber rolls and compost socks at the discharge / sample point