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are available. Dispose of contained concrete in a manner that does not violate <br /> ground water or surface water quality standards. <br /> . Always use forms or solid barriers for concrete pours, such as pilings, within 15- <br /> feet of surface waters. <br /> . Refer to BMP C252: High pH Neutralization Using CO2 (p.409) and BMP C253: <br /> pH Control for High pH Water(p.412)for pH adjustment requirements. <br /> • Refer to the Construction Stormwater General Permit for pH monitoring require- <br /> ments if the project involves one of the following activities: <br /> • Significant concrete work (greater than 1,000 cubic yards poured concrete or <br /> recycled concrete used over the life of a project). <br /> . The use of engineered soils amended with (but not limited to) Portland <br /> cement-treated base, cement kiln dust orfly ash. <br /> . Discharging stormwater to segments of water bodies on the 303(d) list (Cat- <br /> egory 5)for high pH. <br /> Maintenance Standards <br /> Check containers for holes in the liner daily during concrete pours and repair the same <br /> day. <br /> 2014 Stormwater Management Manual for Western Washington <br /> Volume 11- Chapter 4 -Page 314 <br />