Mass proportion method was used for copper. The city has only one major copper contributor at this time, where concentration was multiplied by a factor of 1.5 for growth.
All other industry was multiplied by 5. An additional 10% safety factor was also used while allowing industry growth and protection for the WWTP.
Table no. 9 represents the local limit loadings for copper.
TABLE NO. 9
MASS PROPORTION CALCULATIONS FOR COPPER
INDUSTRIAL USER | INDUSTRY FLOW MGD | MAXIMUM ALLOWABLE LB/DAY | ALLOWABLE DISCHARGE CONCENTRATION MG/L* |
SID's Cortec Mac Tool ** Mead Containers Sugar Creek Packing Sunshine Laundry YUSA Corp. | 0.002 0.015 0.005 0.0036 0.0048 0.0197 | 0.0045 0.0115 0.09 0.0031 0.0135 0.0065 | 0.243 0.083 1.942 0.093 0.303 0.036 |
MID's Biewer Co. Bundy Tubing Calmar Kenskill Calmar, Spring Plant Car Shine Auto Wash Crestar Foods Doane Products Frozen Food Locker Record Herald Thatcher Tubing | 0.001 0.0026 0.022 0.0007 0.0067 0.002 0.0067 0.0004 0.00065 0.0012 | 0.0025 0.005 0.078 0.0035 0.016 0.004 0.0085 0.00015 0.0015 0.004 | 0.27 0.208 0.383 0.54 0.257 0.22 0.137 0.041 0.249 0.36 |
* 10 percent safety factor included.
** Factor of 1.5 used for growth against background.
All others had a factor of 5 used for growth.
(Ord. 6-94, passed 4-27-94)