Table 4. Urban "C" Values for Use With the Simple Method (mg/l)
|
Pollutant |
New Suburban NURP Sites (Wash., DC) |
Older Urban Areas (Baltimore) |
Central
Business District (Wash., DC) |
National
NURP Study Average |
Hardwood Forest (N. Virginia) |
National Urban Highway Runoff |
| Phosphorus | ||||||
| Total | 0.26 | 1.08 | - | 0.46 | 0.15 | - |
| Ortho | 0.12 | 0.26 | 1.01 | - | 0.02 | - |
| Soluble | 0.16 | - | - | 0.16 | 0.04 | 0.59 |
| Organic | 0.10 | 0.82 | - | 0.13 | 0.11 | - |
| Nitrogen | ||||||
| Total | 2.00 | 13.6 | 2.17 | 3.31 | 0.78 | - |
| Nitrate | 0.48 | 8.9 | 0.84 | 0.96 | 0.17 | - |
| Ammonia | 0.26 | 1.1 | - | - | 0.07 | - |
| Organic | 1.25 | - | - | - | 0.54 | - |
| TKN | 1.51 | 7.2 | 1.49 | 2.35 | 0.61 | 2.72 |
| COD | 35.6 | 163.0 | - | 90.8 | >40.0 | 124.0 |
| BOD (5 day) | 5.1 | - | 36.0 | 11.9 | - | - |
| Metals | ||||||
| Zinc | 0.037 | 0.397 | 0.250 | 0.176 | - | 0.380 |
| Lead | 0.018 | 0.389 | 0.370 | 0.180 | - | 0.350 |
| Copper | - | 0.105 | - | 0.047 | - | - |