1300 W MARINE VIEW DR 2018-01-02 MF Import

Page 13 of 46 3. Sampling Locations a. Sampling is required at all discharge points where stormwater (or authorized non- stormwarer) is discharged off-site. b. All sampling point(s) shall be identified on the SWPPP site map and be clearly marked in the field with a flag, tape, stake or other visible marker. 4. Sampling and A•'alysis Methods a. Turbidity analysis shall be performed with a calibrated turbidity meter (turbidimeter), either on-site or at an accredited lab. The results shall be recorded in the site log book in Nephelometric Turbidity Units (NTU). b. Transparency analysis shall be performed on-site with a I'/. inch diameter, 60 centimeter (cm) long Transpazency Tube. The results shall be recorded in the site log book in centimeters (cm). Transpazency Tubes are available from: httn'//watermonitorineeauia com/oaees/stream.htrnl Analytical Sampling Benchmark Parameter Units Method Freyuency Value Turbidity NTU SM2130 or Weekly, if 25 NTU EPA180.1 discharging Transparency cm Manufacturer Weekly, if 31 cm instructions, or dischazging Ecology Guidance 5. Turbidity/Transparency Benchmark Values Tlic benchmark value for turbidity is 25 NTU (Nephelomehic Turbidity Units); and the benchmark value for transparency is 31 cm. a. Turbiditv �6 —�49 NTU or Transoarencv 30 — 7 cm: If discharge turbidity is greater than 25 NTU, but less than 250 NTU; or if discharge transparcncy is less than 31 cm, but greater than 6 cm, the CESCL shalL• i. Review the SWPPP for compliance with Condition S9 and make appropriate revisions within 7 days of the discharge that exceeded the benchmark; and ii. Fully implement and maintain appropriate source control and/or treatment BMPs as soon as possible, but within 10 days of the discharge that erceeded the benchmark; and iii. Document BMP implementation and maintenance in the site log book. b. Turbidih � 50 NTU or ereater or 7'ransnarencv 6 cm or less: