Southeast Regional Office: Regional Manager, Water Management, Lee Park, Suite 6010, 555 North Lane, Conshohocken, PA 19428, telephone (610) 832-6130.
PA 0026247. Amendment No. 1, Sewage, Hatfield Township Municipal Authority, 3200 Advance Lane, Colmar, PA 18915.
This application is for amendment of an NPDES permit to discharge treated sewage from the Hatfield Township Municipal Authority STP in Hatfield Township, Montgomery County. This is an existing discharge to the West Branch of Neshaminy Creek.
The receiving stream is classified for warm water fish, migratory fish, potable water supply, industrial water supply, livestock water supply, wildlife water supply, irrigation, boating, fishing, water contact sports, navigation and esthetics.
The proposed effluent limits for Outfall 001, based on an average flow of 6.43 million gallons per day are as follows:
| Parameter |
Average
Monthly (mg/l) |
Maximum
Daily (mg/l) |
Average
Weekly (mg/l) |
Instantaneous
Maximum (mg/l) |
| CBOD5 |
| (5-1 to 10-31) |
10 |
|
15 |
20 |
| (11-1 to 4-30) |
20 |
|
30 |
40 |
| Suspended Solids |
30 |
|
45 |
60 |
| Ammonia (as N) |
| (5-1 to 10-31) |
2.0 |
|
|
4.0 |
| (11-1 to 4-30) |
6.0 |
|
|
12.0 |
| Nitrite and Nitrate (as N) |
| (7-1 to 10-31) |
9.0 |
|
|
18.0 |
| Phosphorus as P |
| (4-1 to 10-31) |
2.0 |
|
|
4.0 |
| Fecal Coliforms |
200 colonies/100 ml as a geometric average |
| Dissolved Oxygen |
minimum of 6.0 mg/l at all times |
| pH |
within limits of 6.0--9.0 standard units at all times |
| Copper |
0.045 |
0.090 |
|
0.113 |
| Hardness (In-Stream) |
monitor only |
| Silver |
monitor only |
monitor only |
| Free Cyanide |
0.009 |
0.018 |
|
0.023 |
| Boron |
monitor only |
monitor only |
| Total Chromium |
monitor only |
monitor only |
| Total Zinc |
monitor only |
monitor only |
| Total Phenols |
monitor only |
monitor only |
| BHC Gamma |
0.00015 |
0.0003 |
|
0.00038 |
| Whole Effluent |
| Toxicity |
|
1.7 TUc
|
Other Conditions:
Conditions for future permit modification
Implementation of industrial pretreatment program requirements
Effective disinfection
Special test methods for certain pollutants
In-stream hardness sampling
The EPA waiver is not in effect.