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PART II - MONITORING REQUIRMENTS <br />A. Monitoring Frequency <br />1. The following parameters shall be monitored at the frequency and with the <br />sampling type stated below. All measurements, tests, and analyses of the <br />characteristics of water and wastes to which reference is made in this permit shall <br />be conducted using the methods and procedures approved in 40 CFR 136 and <br />amendments thereto, unless otherwise specified. <br />Parameter <br />Sampling Frequency <br />sampling Type <br />Flow, total (gpd) <br />Daily <br />Continuously <br />Flow Monthly (gal) <br />Monthly <br />Continuously <br />Arsenic (mg/L) <br />Weekly <br />Composite <br />Copper (mg/L) <br />Weekly <br />Composite <br />PH (SU) <br />Monthly <br />Grab <br />Ammonia, nitrogen <br />(mg/L) <br />Monthly <br />Composite <br />BOD5 (mg/L) <br />Monthly <br />Composite <br />Phosphorus (mg/L) <br />Monthly <br />Composite <br />TSS (mg/L) <br />Monthly <br />Composite <br />Cadmium (mg/L) <br />Monthly <br />Composite <br />Chromium (mg/L) <br />Monthly <br />Composite <br />Lead (mg/L) <br />Monthly <br />Composite <br />Nickel (mg/L) <br />Monthly <br />Composite <br />Oil and Grease <br />(mg/L) <br />Monthly <br />Grab <br />Oil and Grease TPH <br />(mg/L) <br />Monthly <br />Grab <br />Zinc (mg/L) <br />Monthly <br />Composite <br />Cyanide (mg/L) <br />Semiannually <br />Grab <br />Mercury (mg/L) <br />Semiannually <br />Composite <br />Silver (mg(L) <br />Semiannually <br />Composite <br />See Flow Measurement Requirements referenced in Part III - Reporting Requirements, <br />B. Monitoring Definitions <br />Samples shall be obtained through a flow -proportional sampling technique. If the Water <br />Treatment Facility can demonstrate that time -proportional sampling is as representative <br />as flow -proportional sampling, then a time -proportional sample may be collected. If the <br />Water Treatment Facility chooses to demonstrate that time -proportional sampling is <br />accurate they must do so within 120 days of the effective date of this permit or they shall <br />commence flow -proportional sampling at that time. <br />4 <br />