Cave Rock WQIP
BMP Registration

10/01/2015 to 09/30/2030 (15 years)
7 credits
7 credits (100%)


Registration Area & BMPs
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Credit Schedule
15 years
This infrastructure is well-maintained with regular inspections and maintenance as part of the funding agreement. It is expected that inspections and maintenance will continue as scheduled to ensure the useful life of this infrastructure.

PLRM Models and Load Reduction
CR02 (Project1)
ExistingV5 (Scenario12) Expected Scenario 100%
BaselineV2 (Scenario8) Baseline Scenario 100%

1,598 7 39 N/A
257 3 26 N/A
Load Reduction 1,341 4 13 7
Treatment BMPs

Bed Filter DCBF0001 1,336 5 12 7 Key Yes
Total 7

No distributed BMPs added to registration

The sediment forebay will be cleaned out with a ‘bobcat’ type of machinery annually. Maintenance will be performed once 3” of sediment accumulates in the settling basin. The sand filter media will be tilled every 5 to 7 years and replaced if performance declines dramatically. Once a year or when drainage begins to slow or pond, the top 3-5 inches of the sand filter will be raked. If the sand filter does not drain within 40 hours, maintenance is required. The settling basin and sand filter include sediment traps at each inlet designed to be cleaned with a small excavator or by hand. Conveyance pipes and drop inlets will be cleaned when inspections reveal trash, debris or sediment accumulation over 3”. Inspect three times annually and after major storm events. Remove invasive weeds and tree seedlings to prevent compromise of the impermeable liner. If pine needle obstruct inlet, remove pine needles with street sweeping.
Cave Rock GID intends to inspect and maintain the sediment forebay, the dry basin, bed filter, and conveyances. The dry basin will be inspected in accordance with the protocols described in the BMP RAM User Manual V2 (2NDNATURE 2015) or acceptable equivalent method as required by the NPDES permit. These inspections are used to assess condition/performance and initiate maintenance. Inspections of all BMPs will take place annually during spring, summer, or fall.
Parcel BMPs
Single Family Residential
7% 0%
32.2 2.25 0 7.0% 0.0% n/a
32.2 2.25 0 7.0% 0.0% n/a
Multi-Family Residential
19% 0%
1.3 0.25 0 19.2% 0.0% n/a
1.3 0.25 0 19.2% 0.0% n/a
Commercial, Industrial, and Community Use
5% 0%
0.2 0.01 0 5.0% 0.0% n/a
0.2 0.01 0 5.0% 0.0% n/a
Other Pollutant Control Strategies

No other pollutant control strategies implemented in this registration