Caltrans EIP 988 Infiltration Basins 1 and 2
BMP Registration

10/01/2015 to 09/30/2025 (10 years)
14 credits
14 credits (100%)


Registration Area & BMPs
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Credit Schedule
10 years
Based on BMP condition assessments performed on March 7, 2016 and August 23, 2016 following large precipitation events, both infiltration basins currently drain completely within 24 hours. This rapid drain time indicates that these BMPs are operating as designed with no current maintenance requirements. Caltrans will continue to implement the required condition assessments described above, and will initiate maintenance of these BMPs on an as-needed basis when infiltration rates significantly dec

PLRM Models and Load Reduction
CopyOfEIP_988_South (Project2)
Baseline_South (Scenario1) Baseline Scenario 100%
Expected_South (Scenario2) Expected Scenario 100%

2,798 8 24 N/A
3 0 0 N/A
Load Reduction 2,795 8 24 14
Treatment BMPs

Infiltration Basin EIP988_IB2 1,489 4 15 7 Key No
Infiltration Basin EIP988_IB1 1,014 3 9 5 Key No
Total 12

No distributed BMPs added to registration

Caltrans Stormwater WQ Handbook, Maintenance Staff Guide (2009), Section C.23.2 Infiltration Basins, specifies measures intended to maintain infiltration basins as effective devices, and set forth inspection and maintenance procedures to allow the basins to function as designed for water quality purposes. This guidance includes inspections, preventive maintenance, and maintenance. Observations are made at various times of the year to inspect for standing water, erosion, vegetation type and presence, sediment accumulation. CASQA BMP Handbook, TC-11, Operation and maintenance guidelines. Observations are made after storms, and at the end of the wet season, and include observations of standing water, accumulated sediment, trash and debris, and vegetation cover and type. Caltrans will initiate maintenance based on the results of these required condition assessments. BMPs will be maintained by Caltrans using a vactor truck, hand crews to remove excess sediment.
Caltrans intends to inspect these basins in accordance with the combined protocols described in the BMP RAM User Manual V2 (2ND Nature 2015), CASQA BMP Handbook TC-11 (Infiltration Basin) and Caltrans Storm Water Quality Handbook, Maintenance Staff Guide (2009). The primary measure of effectiveness is infiltration through observation of standing water and sediment accumulation. Although the Caltrans Maintenance Staff Guide is followed by maintenance staff and contains the most stringent inspection and maintenance protocols, only the required inputs into BMP RAM using the inspection data sheets will be submitted to the BMP RAM Online Tool. Both the CASQA and Caltrans inspection and maintenance procedures should be considered acceptable equivalents, and are sufficient for Caltrans NDPES permit. These inspections are used to assess condition/performance and initiate maintenance. Inspections of the BMPs will take place annually during spring, summer or fall.
Please see Catchment Registration Memo for complete detail
Parcel BMPs
Single Family Residential
7% 0%
0 0 0 0.0% 0.0% n/a
0 0 0 0.0% 0.0% n/a
Multi-Family Residential
19% 0%
0 0 0 0.0% 0.0% n/a
0 0 0 0.0% 0.0% n/a
Commercial, Industrial, and Community Use
5% 0%
0 0 0 0.0% 0.0% n/a
0 0 0 0.0% 0.0% n/a
Other Pollutant Control Strategies

No other pollutant control strategies implemented in this registration