Storm Water Pollution Prevention Plan (SWPPP) - the City of Lompoc!

Receiving Water: HighThe Santa Ynez River is on the impaired waterbody 303d list for sedimentation/siltation, and has beneficialuses of Cold water Fishery, Migratory, and Spawning. Based on these characteristics, the site has a highreceiving water risk.In accordance with the chart below, the project was determined to have a combined Level 2 Risk based on itssediment (low) and receiving water (high) characteristics. A copy of the Risk Assessment is provided inAppendix D.The General Permit requires visual monitoring at all sites, and effluent water quality at all Risk Level 2 & 3.Section 4 elaborates on the required monitoring for this project. This SWPPP is designed to adhere to RiskLevel 2 requirements as established in Attachment D of the General Permit.Transmission Water MainThe Transmission Water Main will be installed primarily along existing paved roads. In addition, disturbedareas will be returned to pre-construction conditions at project completion. Using the LUP Project TypeDetermination Flow Chart in Attachment A.1 of the Permit, the project is considered a Type 1 LUP. However,because this is a combined SWPPP the higher risk level of the two portions of the project was utilized. Type 2LUP requirements will be met for the linear portion of the project.2.7 Construction ScheduleThe project is anticipated to start in the fall of 2010 and be completed prior to the rainy season.Contract Award 01/01/2011Site Preparation and Grubbing 01/01/2011Implement Temporary Erosion and Sediment Control BMPs 01/08/2011Clearing and Grading 01/10/2011Well Drilling 01/15/2011Electrical conduit/ subgrade preparation 01/27/2011Transmission Water Main Line 02/20/2011PCC and Drainage 02/27/2011AC Paving Operations 02/27/11Slope Stabilization 08/10/2011Project Accepted 08/15/20112.8 Potential Construction Site Pollutant SourcesThe following is a list of construction materials which will be used and activities that will be performed thathave the potential to contribute pollutants off-site:• Clearing, Grubbing, Trenching and Grading Operations (slopes, pads, driveway and pipeline)• Base and AC Pavement Placement (driveway and pipeline)• PCC (curbs and pads)• Vehicle fluids, including oil, grease, petroleum and coolants (from construction equipment)• Trash (from construction personnel)Municipal Water Well No. 11 and Transmission Water Main – SWPPP July 20, 2010Page 8