2235 LAKE HEIGHTS DR 2020-12-23 - Laserfiche WebLink

I Trade Name Material Chemical/Physical Stormwater Pollutants') 1 Description Antifreeze/coolant Clear green/yellow liquid Ethylene glycol, propylene glycol, heavy metals(copper,lead,zinc) Erosion Solid Particles Soil,Sediment (1) Data obtained from MSDS when available 8.9.1 Required BMPs I The following BMPs or equivalent measures are required of all businesses and agencies during concrete pouring and asphalt application at temporary sites: I • Employees must be educated on the pollution hazards of concrete and asphalt application and cutting. • Loose aggregate chunks and dust must be swept or shoveled and collected (not hosed down a storm drain)for recycling or proper disposal at the end of each work day, especially at work sites such as streets, driveways, parking lots, sidewalks, curbs, and gutters where rain can readily pick up the loose material and carry it to the nearest stormwater conveyance. Small amounts of excess concrete, grout, and mortar can be disposed of in the trash. I • Storm drain covers or similarly effective containment devices must be placed over all nearby drains at the beginning of each day. Shovel or vacuum slurry and remove from the site. All accumulated runoff and solids must be collected and properly disposed at the end111 of each workday, or more often if necessary. • Exposed aggregate washing, where the top layer of unhardened concrete is hosed or scraped off to leave a rough finish, must be done with a mechanism for containment and collection of the discarded concrete slurry(such as the storm drain covers mentioned above). The easiest way to contain the wash water will be to direct the washings to a hole in the ground where the water can percolate into the ground and the solids later covered with soil. • If directed to a drain, a catch basin filter insert must be used to remove the solids. This is especially useful if the activity must proceed on rainy days. • Cleaning of concrete application and mixing equipment or concrete vehicles on the work site must be done in a designated area where the rinse water is controlled. The rinse water must either be collected for proper disposal or put into a hole in the ground where the water can percolate away and the solids later covered with soil or recovered and disposed or recycled. ' The use of any treatment BMP must not result in the violation of groundwater, surface water, or drinking water quality standards. 8.10 Control Dewatering Groundwater is not anticipated to be a factor in this project. Therefore, dewatering will not be required. f Construction Stormwater Pollution Prevention Plan The Bethany at Silver Lake 6 013E30 2180406.10