5805 HIGHWAY PL 2019-03-18 - Laserfiche WebLink

A3.2- Concrete Pouring,Concrete Cutting,and Asphalt Application: Description of Pollutant Sources: This activity applies to this project on a temporary basis and only during construction. Pollutant Control Approach: Train employees on proper procedures, sweep or shovel aggregate chunks, collect accumulated runoff and solids, and wash equipment in designated areas. Required BMPs The following BMPs or equivalent measures are required during concrete pouring and asphalt application: 1.Employees must be educated on the pollution hazards of concrete and asphalt application and cutting. 2. 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 workday, 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. 3. 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 of(see BMP S.2 in Chapter 4 for disposal options) at the end of each workday, or more often if necessary. 4. 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 washwater 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. 5. 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 of or recycled. Suggested BMPs 1.Avoid the activity when rain is occurring or expected. 2. If possible,portable asphalt mixing equipment should be covered by an awning, a lean-to, or another simple structure to avoid contact with rain. See BMP S.4 in Chapter 4 for further details on cover structures. 3.Recycle broken concrete and asphalt. Look under Recycling Services in the Yellow Pages of the phone book to find the nearest recycler.