Resource

The Regional Water Quality Control Board (RWQCB) requires an approved permit prior to any commercial entity discharging water into a storm or sewer drain.  Based on the area, the RWQCB will specify the types and maximum concentrations of targeted contaminants.  These will usually include the following contaminants [taken from an actual dewatering permit in Beverly Hills]:

 
 
 Typical Discharge Limitations
Constituents
Units
Daily Maximum
Monthly Average
Total Suspended Solids
mg/L
150
50
Turbidity
NTU
150
50
BOD5 20oC
mg/L
30
20
Oil and Grease
mg/L
15
10
Settleable Solids
mg/L
0.3
0.1
Sulfides
mg/L
1.0
---
Phenols
mg/L
1.0
---
Residual Chlorine
mg/L
0.1
---
Methylene Blue Active Substances (MBAS)
mg/L
0.5
---

 The above testing is typically conducted monthly, with more extensive testing performed quarterly.