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Stormwater Pollution Prevention Plan <br /> 2. Assess whether additional BMPs should be implemented, and document <br /> revisions to the SWPPP as necessary. <br /> 3. Sample discharge location daily until the analysis results are less than 25 <br /> NTU (turbidity) or greater than 32 cm (transparency). <br /> If the turbidity is greater than 25 NTU (or transparency is less than 32 cm)but less than 250 <br /> NTU(transparency greater than 6 cm) for more than three days, additional treatment BMPs will <br /> be implemented within 24 hours of the third consecutive sample that exceeded the benchmark <br /> value. Additional treatment BMPs to be considered will include, but are not limited to, off-site <br /> treatment, infiltration, filtration and chemical treatment. <br /> If the 250 NTU benchmark for turbidity(or less than 6 cm transparency) is exceeded at any time, <br /> the following steps will be conducted: <br /> 1. Notify Ecology by phone within 24 hours of analysis (see Section 5.0 of this <br /> SWPPP for contact information). <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 seven <br /> days of the first 250 NTU exceedance. <br /> 5. Describe inspection results and remedial actions taken in the site log book <br /> and in monthly discharge monitoring reports as described in Section 7.0 of <br /> this SWPPP. <br /> 6.2.2 pH Sampling <br /> Sampling and monitoring for pH needs occur during the phase of construction when/if concrete <br /> pouring will be conducted until fully cured(3 weeks following pour). <br /> SNBL USA, LTD—Seaway Commercial Center <br /> SWPPP 16 August, 2022 <br />