2514 RAINIER AVE 2020-04-02 - Laserfiche WebLink

x r NORTH MIDDLE SCHOOL IV. SOURCE CONTROL PLAN The Activity Worksheet has been reviewed(Figure 1.1 in Volume IV,Chapter 2, of the COESWMM)and it was found that items A3.2 and A5.2 apply during the construction of the portables and item A5.1 will apply during the removal of the portables. The Activity Worksheet is provided for reference in Figure 5. Therefore, Minimum Requirement#3:Source Control of Pollution is met. The following BMPs are required for Item A3.2 per the 2010 COESWMM Volume IV: 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 storm water 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. The following BMPs are required for Item A5.2 per the 2010 COESWMM Volume IV: 1. Employees must be educated about the need to control site activities to prevent storm water pollution, and also trained in spill cleanup procedures. 2. Spill cleanup materials, appropriate to the chemicals being used on site, must be available at the work site at all times. 3. The work site must be cleaned up at the end of each workday, with materials such as solvents put away indoors or covered and secured so that vandals will not have access to them. 4. The area must be swept daily to collect loose litter,paint chips, grit, and dirt. 5. Absolutely no substance can be dumped on pavement, on the ground, or in or toward storm drains, regardless of its content, unless it is water only. 6. For wood treating activities drop cloths must be placed where space and access permit before the work begins.Additional drip pans must be used in areas where drips are likely to occur that cannot be protected with a drop cloth. 7. Ground or drop cloths must be used underneath scraping, sandblasting work. Ground cloths, buckets, or tubs must also be used anywhere that work materials are laid down. 8. Incidental cleaning of paint brushes and other tools that are covered with water-based paints must be cleaned in sinks connected to sanitary sewers or in portable containers that can subsequently be dumped into a sanitary sewer drain. Brushes and tools covered with non-water-based finishes or other materials must be cleaned in a manner that enables collection of used solvents for recycling or proper disposal and cannot be discharged to the sanitary sewer. See BMP S.2 in Chapter 4 for disposal options. 9. Storm drain covers or similarly effective devices must be used if dust,grit, washwater, or other pollutants may escape the work area. This is particularly necessary on rainy days. The cover or containment device shall be placed over the storm drain at the beginning of the workday, and accumulated dirty runoff and solids must be collected and disposed of before removing the cover at the end of the day. COUGHLINPORTERLUNDEEN 5 SftUCT'JRAL C.J!t SFISM!C ;-,. :;�.J RANG