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<br />COLORADO DE2ART`lENT OF HEALTH <br />Water Quality Control Division <br />Rationale - Page 13 <br />Permit No.: CO-0038776 <br />VI. EFFLUENT LL`SITATIONS FOR THE D0:7ESTIC WASTEWATER DLSCHARGE POINT: <br />TABLE 7 <br />EFFLUENT LL'tITATI0A9 FOR DLSCHA.4G'c POINT 007 <br />L <br />Parameter <br />Flow - ~1GD <br />pH - s.u. <br />Oil and Grease - mg/1 <br />BODg - mg/1 (lblday) <br />TSS - mg/1 (Lb/day) <br />TRC - mg/1 <br />Fecal Coliform Bacteria - <br />~/100 ml <br />2ota1 Ammonia - mg/1 as N <br />Salinity <br />Table 7 below lists the effluent <br />limitaticns for discharge point 007, <br />from the domestic wastewater treatment <br />plane. <br />Limitation <br />0.0100 MGD <br />6.5-9.0 <br />10.0 <br />30145 (2.5!3.75) <br />Rationale <br />Design Capacity <br />Proposed Water Quality <br />Standards <br />State Effluent Stndrs. <br />State Effluent Stndrs. <br />30/45 (2.5/3.75 <br />0.5 <br />State Effluent Stndrs. <br />Proposed Water Quality <br />Standards <br />6000/12000 Proposed Water Quality <br />Standards <br />N/A Refer to Discussion <br />N/A Monitoring <br />DISCUSSION OF EFFLUENT LL`SITATIONS FOR 007: <br />A. BODS, TSS, pH, and Oil and Grease <br />The state effluent standards for BODS and total suspended solids <br />(30/45 mg/1 for the 30-day average/7-day average Limitations) and oil <br />and grease (10 mg/1) are applicable. Since the proposed stream <br />standard for Che North Fork of the Gunnison for pH is 6.5 to 9.0, this <br />pH range is specified as a permit limitation. <br />B. Total Residual Chlorine (TRC) <br />The TRC limitation is based on the following mass balance calculation. <br />Q3C3 ' Q1C1*Q2C2 or C2 ' 4303-Q~Ci <br />Q2 <br />where <br />Q1 Q7-10 upstream ' 33.0 cfs 21.3 :SGD <br />C1 background TRC concentration ' 0.0 me/I <br />Q2 design floe from ARCO W[JTP = 0.0100 :iGD <br /> <br />