Appendix 7 - Answer State and Regional Water Resources Control Board Contacts
Rainfall erosivity waiver - The ability to allow a small construction site (>1 and <5 acres)
to self-certify if the rainfall erosivity value (R value) for their site's given location and
time of year calculate to be less than or equal to 5.
ATS (Active Treatment Systems) - There are circumstances on construction sites where
standard erosion and sediment controls cannot adequately control accelerated erosion.
Under such circumstances, or in instances where it can be demonstrated that the storm
water discharges leaving a site would either cause or contribute to an exceedance of a
water quality standard, the use of an Active Treatment System might be required. It may
also be appropriate to use an ATS when site constraints inhibit the ability to construct a
, correctly sized sediment basin, when clay and or highly erosive soils are present, or
when the site has very steep or long slope lengths.
What are the NALs for Risk 2 and 3 - Answer pH <6.5 and >8.5
Turbidity >250 NTU
Receiving Water Monitoring Triggers - Answer For Risk level 3
pH <6.0 and >9.0
Turbidity > 500 NTU
What is a Qualifying Event? - Answer 1/2" or more of discharges over a period of time in
which there is no break in rain > 48 hrs
What Permit Registration Documents are needed before start of construction? - Answer
Notice of Intent (NOI)
Risk Assessment
Post Construction BMP Information
Site Map
Storm Water Pollution Prevention Plan
Annual Fee
Signed Certification Statement
What is Sedimentation - Answer Deposition of eroded material
3 S's of wind erosion - Answer Saltation
Soil Creep
Suspension
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