The project limits are in the (Insert Name of Watershed(s)). The Total Maximum Daily Loads (TMDLs) are as follows:
(Insert here the TMDLs paragraphs from the GIS website)
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The project limits are in the Los Angeles River Watershed. The Total Maximum Daily Loads (TMDLs) are as follows:
Established TMDLs
Los Angeles River Trash TMDL
The Los Angeles River Trash TMDL became effective August 28, 2002. Caltrans is proceeding with Trash TMDL Implementation Projects, which are to retrofit Gross Solid Removal Devices (GSRDs) at the existing drainage outfalls in the rights-of-way. Table A lists those Trash TMDL Implementation Projects that are either in construction or completed. Any projects that overlap within the limits of freeway corridors listed in Table A are not required to consider GSRDs for those overlapping limits. However, Project Engineers shall consider placing infiltration basins or media filters as much as possible in lieu of GSRDs at existing and proposed drainage systems.
|
Table A |
||||
|
|
|
PM |
Status |
|
|
EA |
Route |
From |
To |
|
|
226611 |
405 |
30.31 |
36.15 |
completed |
|
226711 |
60 |
2.7 |
6.6 |
completed |
|
710 |
22.5 |
23.8 |
||
|
2266A1 |
5 |
27.62 |
28.15 |
completed |
|
10 |
9.02 |
13.82 |
||
|
90 |
1.84 |
2.70 |
||
|
2267A1 |
10 |
5.59 |
8.80 |
In construction |
|
91 |
10.25 |
13.88 |
||
|
105 |
8.25 |
13.15 |
||
|
110 |
21.65 |
23.61 |
||
|
231311 |
2 |
15.40 |
21.46 |
completed |
|
101 |
7.21 |
7.21 |
||
|
170 |
14.78 |
19.92 |
||
|
134/710 |
13.34 |
13.34 |
||
|
210 |
22.73 |
23.88 |
||
|
405 |
25.46 |
29.41 |
||
|
235901 |
5 |
16.35 |
16.35 |
In construction |
|
101 |
12.70 |
26.50 |
||
|
134 |
0.00 |
9.86 |
||
Los Angeles River Nitrogen Compounds and Related Effects TMDL
The Los Angeles River Nitrogen Compounds and Related Effects TMDL became effective March 23, 2004. The TMDL requires the Storm Water NPDES Permittees to submit a Monitoring Work Plan by March 23, 2005 to estimate nitrogen loadings associated with runoff from the storm drain systems. County of Los Angeles has submitted the Monitoring Work Plan as required on behalf of Caltrans and other Storm Water NPDES Co-Permittees in the watershed. Targeted pollutants are Total ammonia as nitrogen (NH3-N), Nitrate-nitrogen (NO3-N), nitrite-nitrogen (NO2-N), and Nitrate nitrogen plus nitrite-nitrogen (NO3-N + NO2-N).The Department's monitoring data depicts Caltrans discharges to be below the TMDL limits, thus no additional measures are needed to be considered for meeting the conditions of the Nitrogen TMDL.
Los Angeles River and Tributaries Metals TMDL
The Los Angeles River and Tributaries Metals TMDL became effective on January 11, 2006. Caltrans will work with 5 groups of Responsible Agencies toward compliance of the TMDL. Targeted Pollutants are total Cu, Pb, Zn, Cd and Se. Project Engineers shall consider treatment controls for the project and consult with the District NPDES Storm Water Coordinator.
Future TMDL
Total Maximum Daily Loads for Indicator Bacteria in the Los Angeles River
The Total Maximum Daily Loads for Indicator Bacteria in the Los Angeles River was adopted by the Los Angeles Regional Water Quality Control Board on July 8, 2010. It is anticipated that the TMDL will become effective in the near future. The TMDL requires the Responsible Agencies, including Caltrans, to reduce number of exceedance days of bacteria concentrations in the Los Angeles River and achieve waste load allocations in 25 years. Caltrans will be working in a group of Responsible Agencies to jointly comply with the TMDL. Project Engineer of projects located where dry weather diversion exists needs only consider infiltration devices for bacteria removal; however, all other projects, shall consider both dry weather flow diversion and infiltration devices.