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North County Recycling Center and Sanitary Landfill Storm Water Pollution Prevention Plan Page 4 The four main buildings on site are: • Recycling Center Building (approx. 66,450 square feet); • Office / Maintenance Building (approx. 10,275 square feet) • Water Pump House Building (approx. 685 square feet); and • Scale House (approx. 450 square feet) Scheduled facility operating hours are seven days a week, 7 AM to 4 PM: closed holidays. 2.2 Surface Drainage and Receiving Water The surface drainage system consists of ditches, culverts, and drains designed to convey surface water runoff and control erosion by reducing water velocities. The North County Landfill facility has two storm water discharge points (SW-3 and SW-4, Map 2) with Module 5B being the current active section of the landfill. An on-site sedimentation basin (the Interim Sedimentation Basin or ISB) receives the majority of surface water runoff from the landfill areas. Generally, water in the ISB is retained for use on site, but the County may elect to discharge water (sample point SW-3) into a grassy swale that drains to the mitigation area located in the northern portion of the property. The ISB allows sediment and other pollutants to settle out before water is discharged to the mitigation area. The mitigation area was contoured when the landfill was first constructed in 1992 to encourage wetland surfaces in mitigation of the wetland surfaces included in the landfill footprint. South Paddy Creek is an intermittent stream that crosses the pasture north of the recycling center. Paddy Creek discharges into Bear Creek (approximately 2.8 miles southwest of the facility) and is part of the Bear Creek watershed (HUC-10: 1804000304). Bear Creek ultimately discharges into Disappointment Slough, which is tributary to the San Joaquin River and the California Delta. A complete description of the site’s surface drainage system can be found in the Joint Technical Document. Due to culvert pipe which connects from the vineyard and North County Landfill, there is run- on which enters the property form the vineyard to the east. There is also run-on which is coming from the vineyard on the southside and the southeast corner for the property.