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North County Recycling Center and Sanitary Landfill Storm Water Pollution Prevention Plan Page 21 connected the tank truck fill line to the outer tank opening of the double-wall tank, rather than to the tank fill port. Since the annulus of the double-walled tank is smaller than the inner tank area, it filled much quicker than was expected and overflowed. About one cubic yard of absorbent was used to absorb this spill and was removed. No diesel fuel from this incident entered a navigable waterway. On November 19, 2006, approximately 100-150 gallons of diesel fuel was spilled. A 1,000- gallon tank on a service truck was being filled when the shut-off failed, causing diesel to spill onto the truck wash area, creating a pond on the concrete pad. The pump was turned off and the diesel was absorbed with soil on the concrete pad. About 40 cubic yards or 44 tons of soil containing diesel was sent to a Class 2 landfill. The incident was reported to the California Office of Emergency Services (OES) as well as the local OES. 6.1.5 Non-Storm Water Discharges The only regular authorized non-storm water discharge that may occur at the facility is from dust control water used on site for dust suppression. Dust is controlled in accordance with the requirements of the San Joaquin Valley Air Pollution Control District. Water is applied to roads during dry weather in a manner to prevent or minimize the amount of runoff to the storm water drainage system. Less frequently, fire hydrant flushing occurs, and is directed to, and contained within, the interim sediment pond. Potential unauthorized non-storm water discharges (NSWDs) include overflow from the wash / fueling pad, discharges from the recycling center, and up-sets or spills from the leachate collection system. 6.1.6 Erodible Surfaces Soil erosion and sedimentation is the most significant threat to storm water quality at this facility. Soil erosion may occur from the weathering of the landfill slopes, drainage swales, the Interim Sedimentation Basin walls and floor, and roadways. Erosion and sedimentation deposition may also be caused by facility maintenance and the movement of vehicles and other heavy equipment. Section 8.1.5 identifies best management practices and control measures utilized at North County Landfill to prevent erosion and control sedimentation. On December 20, 2017, soils in the drainage swales at the facility outfalls SW-3 and SW-4 were tested and found to contain significant concentrations of aluminum and iron at very similar levels. The sample near SW-3 collected from the swale earthen wall directly across from the Interim Sedimentation Basin discharge valves had an aluminum concentration of 18,000 mg/kg and an iron concentration of 27,000 mg/kg. The sample collected from the freshly graded new drainage swale at SW-4 had an aluminum concentration of 16,000 mg/kg and an iron concentration of 24,000 mg/kg. It is important to note that no water flow or industrial activities had occurred at the sampled location near SW-4; therefore, the aluminum detected at that sampling location is naturally occurring and not the result of landfill activity. Figure 13 - The facility's most significant potential pollutant source would be sedimentation from soil erosion and track out