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Applicable BMPs: <br /> ■ Monitoring should be perFormed to ensure concrete placement does not <br /> result in excessively high pH in stormwater runoff. pH testing should be <br /> performed on a weekly basis,from the start of concrete work until pH <br /> drops below 8.5 su. <br /> Concrete and grout: <br /> ■ Process water and slurry resulting from concrete work will be prevented <br /> from entering the waters of the State by implementing Concrete <br /> Handling measures (BMP C151). Concrete wash out areas shall not be <br /> allowed on bare dirt or allowed to drain to bare dirt or the storm system. <br /> Installation Schedules: Start of project and replaced as needed and at start of wet season. <br /> Inspection and Maintenance plan: Responsible staff to make weekly site walks and inspections <br /> to identify deficiencies in onsite BMPs and anticipate potential problems and remedies. <br /> Responsible Staff: Identified Certified Erosion and Sediment Control Lead in Section 3 of this <br /> SWPPP. <br /> Adjust pH of stormwater if outside the range of 6.5 to 8.5 su. <br /> Obtain written approval from Ecology before using chemical treatment with the exception of CO2 <br /> , or dry ice to modify pH. <br /> Concrete trucks must not be washed out onto the ground, or into storm drains, open ditches, <br /> streets, or streams. Excess concrete must not be dumped on-site, except in designated <br /> concrete washout areas with appropriate BMPs installed. <br /> Will uncontaminated water from water-only based shaft drilling for construction of building, road, <br /> and bridge foundations be infiltrated provided the wastewater is managed in a way that prohibits <br /> discharge to surface waters? <br /> ❑ Yes� No <br /> Page � 19 <br />