Lake Elsinore aeration Canyon Lake aeration/destratification in deep water Canyon Lake dredging in East Bay Structural BMPs Sewer and septic improvements This planning report supplemented the models Tetra Tech developed to understand sources and allowable loads Interception and treatment of nuisance urban runoff (2004). San Identify existing and planned nutrient controls and for the development of the 2004-adopted TMDL. No Riparian habitat restoration and development of Jacinto Nutrient recommend additional projects quantitative water quality benefit estimates were agricultural buffers Management developed for the listed existing and potential Determination of crop-specific agronomic rates for Plan projects. guidance in fertilizer and manure application management Assessment of nutrient loads to San Jacinto River watershed from flooding of agricultural areas Regional organic waste digester Phase 1: Lake level stabilization with levee and reclaimed water additions Destratification with axial flow pumps Expected results from 1 projects estimated to Large scale in-lake aeration system achieve ~78% reduction in phosphorus load based Fishery management including carp netting and on studies by Anderson (2006) not accounting for stocking of fish to control shad population indirect benefits from higher lake level or larger Phase 2: Supplemental projects if needed – zooplankton population. Enhanced aeration system - more frequent Continued monitoring recommended to determine LECL Task operation or additional pipelines/aerators Develop implementation plan to meet the 2004 whether a supplemental Phase 2 project would be Force (2007). TMDL numeric targets in Lake Elsinore Enhanced treatment of reclaimed water to < 0.5 needed. Nutrient Reduction Plans mg/L Additional special studies recommended including Direct application of alum or other chemical P (1) in-lake measurements of sediment organisms as a living sink for nitrogen; (2) estimation of treatment sediment denitrification as an atmospheric sink for Targeted suction dredging nitrogen; and (3) in-lake samples of nitrogen fixing Constructed wetlands in back basin potential of lake as source for nitrogen. Active aquatic plant management Enhanced fishery management Enhanced lake stabilization (groundwater or reclaimed water)
Tetra Tech (2004). San Jacinto Nutrient Management Plan Identify existing and planned nutrient controls and recommend additional projects Lake Elsinore aeration Canyon Lake aeration/destratification in deep water Canyon Lake dredging in East Bay Structural BMPs Sewer and septic improvements Interception and treatment of nuisance urban runoff Riparian habitat restoration and development of agricultural buffers Determination of crop-specific agronomic rates for guidance in fertilizer and manure application management Assessment of nutrient loads to San Jacinto River watershed from flooding of agricultural areas Regional organic waste digester This planning report supplemented the models developed to understand sources and allowable loads for the development of the 2004-adopted TMDL. No quantitative water quality benefit estimates were developed for the listed existing and potential projects. LECL Task Force (2007). Nutrient Reduction Plans Develop implementation plan to meet the 2004 TMDL numeric targets in Lake Elsinore Phase 1: Lake level stabilization with levee and reclaimed water additions Destratification with axial flow pumps Large scale in-lake aeration system Fishery management including carp netting and stocking of fish to control shad population Phase 2: Supplemental projects – if needed Enhanced aeration system - more frequent operation or additional pipelines/aerators Enhanced treatment of reclaimed water to < 0.5 mg/L Direct application of alum or other chemical P treatment Targeted suction dredging Constructed wetlands in back basin Active aquatic plant management Enhanced fishery management Enhanced lake stabilization (groundwater or reclaimed water) Expected results from 1 projects estimated to achieve ~78% reduction in phosphorus load based on studies by Anderson (2006) not accounting for indirect benefits from higher lake level or larger zooplankton population. Continued monitoring recommended to determine whether a supplemental Phase 2 project would be needed. Additional special studies recommended including (1) in-lake measurements of sediment organisms as a living sink for nitrogen; (2) estimation of sediment denitrification as an atmospheric sink for nitrogen; and (3) in-lake samples of nitrogen fixing potential of lake as source for nitrogen.
Section-7_Implementation_Draft120417.docx