Orde r No. R2-2020-0002
NPDES No. CA0037621
4 C. Average dry weather effluent flow in excess of 29.5 million gallons per day (MGD) is prohibited. Average dry weather effluent flow shall be determined from three consecutive dry weather months (May 1 to October 31) each year, with compliance measured at Monitoring Location EFF-001 as described in the Monitoring and Reporting Program (MRP) (Attachment E).
D. Any sanitary sewer overflow that results in a discharge of untreated or partially treated wastewater to waters of the United States is prohibited.
IV. EFFLUENT LIMITATIONS AND DISCHARGE SPECIFICATIONS
A. Effluent Limitations. The Discharger shall comply with the following effluent limitations at Discharge Point No. 001, with compliance measured at Monitoring Location EFF-001 as described in the MRP:
Table 4. Effluent Limitations
Parameter Units
Average
Monthly
Limit
Maximum
Daily
Limit
Instantaneous
Minimum
Limit
Instantaneous
Maximum
Limit
Carbonaceous
Biochemical Oxygen
Demand, 5-day @ 20°C
(CBOD5) [1]
mg/L 10 20 --- ---
Total Suspended Solids
(TSS) mg/L 20 30 --- ---
Oil and Grease mg/L 5 10 --- ---
pH [2] standard units --- --- 6.5 8.5
Total Residual Chlorine mg/L --- --- --- 0.0
Turbidity [3] NTU --- --- --- 10
Total Ammonia
(October-May)
mg/L as
nitrogen 18 26
Total Ammonia
(June-September)
mg/L as
nitrogen 2 5 --- ---
Copper, Total
Recoverable µg/L 10 19 --- ---
Nickel, Total Recoverable µg/L 24 33 --- ---
Cyanide, Total µg/L 7.0 17 --- ---
Dioxin-TEQ µg/L 1.4 x 10-8 2.8 x 10-8 --- ---
Unit Abbreviations:
mg/L = milligrams per liter
NTU = nephelometric turbidity units
µg/L = micrograms per liter
Footnote:
[1] The Discharger may elect t o measure carbonaceous biochemical oxygen demand (CBOD5) as biochemical oxygen demand (BOD5), as defined in the latest edition of Standard Methods for the Examination of Water and Wastewater. [2] If the Discharger monitors pH continuously, pursuant to 40 CFR sec tion 401.17 the Discharger shall be in compliance with this pH limitation provided that both of the following conditions are satisfied: (i) the total time during which the pH is outside the required range shall not exceed 7 hours and 26 minutes in any calendar month; and (ii) no individual excursion from the required pH range shall exceed 60 minutes. [3] From October 1 through May 31, the turbidity effluent limit shall only apply when TSS exceeds 20 mg/L.
B. Percent Removal. The average monthly percent removal of biochemical oxygen demand (BOD5) (measured as carbonaceous biochemical oxygen demand [CBOD5] or BOD5 per City of Sunnyvale
Sunnyvale Water Pollution Control Plant and C ollection System Attachment 1