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APPENDIX A: MONITORING PLAN <br /> Draft Water Quality Monitoring Plan <br /> For <br /> Main Relief Canal Pollution Control Structure <br /> BMP Effectiveness Evaluation <br /> Sampling Locations: Inflow and outflow of the treatment system <br /> Frequency of monitoring : Seven storm events of varying intensity <br /> Storm Events : Storm event flow in the Main Relief Canal is dictated by the <br /> opening of a water control structure operated by the IRFWCD . <br /> Gates are opened an average of 20 times per year and left open <br /> approximately 20 % of the year. Typically a one-inch rainfall or <br /> greater will result in a gate opening and discharge to the IRL. <br /> Flow Measurements : Flow will be measured using ultrasonic or similar flow <br /> meters . <br /> Parameters to be monitored : <br /> Parameter Detection Limit Method <br /> Total Cadmium 1 ug/I Composite <br /> Total Chromium 5 ug/I Composite <br /> Total Copper 5 ug/I Composite <br /> Total Zinc 10 ug/I Composite <br /> NO2+NO3 0 . 1 mg/I Composite <br /> TKN 0 . 3 mg/I Composite <br /> Total Ammonia N 0 . 05 mg/l Composite <br /> Total Phosphorus 0. 05 mg/I Composite <br /> Ortho Phosphate 0.05 mg/I Composite <br /> TSS 1 mg/1 Composite <br /> Oil/Grease 1 mg/I Composite <br /> BMP Effectiveness Evaluation <br /> Vegetative material collected from the treatment system will be continuously quantified <br /> by recording a wet weight and moisture content. Representative samples will be <br /> periodically collected and analyzed for total phosphorus and total nitrogen on a dry- <br /> weight basis . The County will maintain a running log of the total weight of vegetative <br /> material removed by the treatment system . It will maintain a running total of phosphorus <br /> and nitrogen removed on a dry-weight basis. This information will be used to document <br /> credit towards achieving the TMDL for this basin . <br /> The Main Relief Canal has a continuous flow discharge to the Indian River lagoon that <br /> averages approximately 50 million gallons per day. During storm event periods radial <br /> DEP Agreement No. GO 182, Attachment A- 1 , Page 11 of 12 <br />