1515 132ND ST SE 2022-01-20 - Laserfiche WebLink

are available. Dispose of contained concrete in a manner that does not violate ground water or surface water quality standards. . Always use forms or solid barriers for concrete pours, such as pilings, within 15- feet of surface waters. . Refer to BMP C252: High pH Neutralization Using CO2 (p.409) and BMP C253: pH Control for High pH Water (p.412) for pH adjustment requirements. . Refer to the Construction Stormwater General Permit for pH monitoring require- ments if the project involves one of the following activities: Significant concrete work (greater than 1,000 cubic yards poured concrete or recycled concrete used over the life of a project). . The use of engineered soils amended with (but not limited to) Portland cement -treated base, cement kiln dust or fly ash. . Discharging stormwater to segments of water bodies on the 303(d) list (Cat- egory 5) for high pH. Maintenance Standards Check containers for holes in the liner daily during concrete pours and repair the same day. BMP C152: Sawcutting and Surfacing Pollution Prevention Purpose Sawcutting and surfacing operations generate slung and process water that contains fine particles and high pH (concrete cutting), both of which can violate the water quality standards in the receiving water. Concrete spillage or concrete discharge to surface waters of the State is prohibited. Use this BMP to minimize and eliminate process water and slurry created through sawcutting or surfacing from entering waters of the State. Conditions of Use Utilize these management practices anytime sawcutting or surfacing operations take place. Sawcutting and surfacing operations include, but are not limited to, the following: . Sawing . Coring . Grinding . Roughening 2014 Stormwater Management Manual for Westem Washington Volume 11 - Chapter 4 - Page 314