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Stormwater Pollution Prevention Plan <br /> 2. Continue daily sampling until the turbidity is less than 25 NTU (or <br /> transparency is greater than 32 cm). <br /> 3. Initiate additional treatment BMPs such as off-site treatment, infiltration, <br /> filtration and chemical treatment within 24 hours of the first 250 NTU <br /> exceedance. <br /> 4. Implement additional treatment BMPs as soon as possible, but within 7 days <br /> of the first 250 NTU exceedance. <br /> 5. Describe inspection results and remedial actions taken in the site log book and <br /> in monthly discharge monitoring reports as described in Section 7.0 of this <br /> S WPPP. <br /> 6.2.2 pH Sampling <br /> Stormwater runoff will be monitored for pH starting on the first day of any activity that includes <br /> more than 40 yards of poured or recycled concrete, or after the application of"Engineered Soils" <br /> such as, Portland cement treated base, cement kiln dust, or fly ash. This does not include <br /> fertilizers. For concrete work,pH monitoring will start the first day concrete is poured and <br /> continue until 3 weeks after the last pour. For engineered soils, the pH monitoring period begins <br /> when engineered soils are first exposed to precipitation and continue until the area is fully <br /> stabilized. <br /> Stormwater samples will be collected daily from all points of discharge from the site and <br /> measured for pH using a calibrated pH meter, pH test kit, or wide range pH indicator paper. If <br /> the measured pH is 8.5 or greater,the following steps will be conducted: <br /> 1. Prevent the high pH water from entering storm drains or surface water. <br /> 2. Adjust or neutralize the high pH water if necessary using appropriate <br /> technology such as CO2 sparging (liquid or dry ice). <br /> 3. Contact Ecology if chemical treatment other than CO2 sparging is planned. <br /> 19 <br />