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6 Mitigation and Minimization Measures
Pages 101-122

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From page 101...
... The Habitat Conservation Plan (HCP) lists 38 M&M measures that have an associated budget.
From page 102...
... Voluntary Irrigation $29.2 million All Reduce irrigator pumping Suspension Program Option (5.1.2) San Marcos System Texas wild rice $1.05 million TWR Maintain TWR in the system enhancement and restoration (5.3.1, 5.4.1)
From page 103...
... DO depletion Riparian improvements $325,000 SAV, Prevent bank erosion, and sediment removal CSRB sediment accumulation, and specific to the CSRB potential siltation of CSRB (5.2.8) habitat Gill parasite control $725,000 FD Prevent FD disease and non-native snail removal program (5.2.6)
From page 104...
... Science Review Panel $550,000 All Provide ongoing advice (NAS) Improve Groundwater Budgeted prior to All Better predict spring flow and Model and outside the well responses to changes in HCP climate, management options, etc.
From page 105...
... , and the Edwards Aquifer Habitat Conservation Plan (HCP) and ITP maintain that focus (HCP 4-36)
From page 106...
... Texas Blind Salamander 100 cfs 60 cfs N/A Texas Wild Rice ("damage or destruction" 100 cfs 100 cfs 100 cfs standard from ESA for plants) ity to control the timing and duration of low spring flows" (HCP 4-37)
From page 107...
... Implementation measures common to all four alternatives included the EAA's groundwater withdrawal program and permit administration (mandated under Texas law by the EAA Act) ; the City of New Braunfels' manage­ ent of golf course diversions, spring-fed pool diversions, and boat m operations on Comal River and Landa Lake, along with infrastructure maintenance and repair, litter collection, and floating vegetation management; and the City of San Marcos's management of boat operations on the San Marcos River and its infrastructure maintenance and repair (EIS 2-2 Table 2-1)
From page 108...
... Every time an M&M measure is implemented, there is a need to document whether it is working. This should be done not only for the first year of implementation, but periodically with a comprehensive synthesis of the monitoring data every five years or so that goes beyond the simple trends analyses found in the HCP annual reports.
From page 109...
... In the San Marcos system, 22,000 plants were restored, resulting in 700 m2 of sustained coverage. In addition, the San Marcos system separates out their highly successful Texas wild rice program to report 30,000 total plants as associated with 3,600 m2 of areal coverage by February 2016.
From page 110...
... Ultimately, consideration of the vegetation M&M measures must encompass preservation of the fountain darter and Texas wild rice, the two species specifically targeted for protection in the HCP, as the primary end goal for any removal or restoration efforts. Performance monitoring of the vegetation M&M measures should continue to follow the example laid out in BIO-WEST and Watershed Systems Group (2016)
From page 111...
... In order for this to be useful, there must be some effort to convert the areas of nonnative removal and sustained coverage to fountain dater populations, using data for associated fountain darter densities as reported in the HCP or in the calculation of take. Sediment Accumulation and Removal Minimization and mitigation measures in support of the HCP include sediment removal at specific locations in the Comal and San Marcos Rivers.
From page 112...
... Monitoring is critical to the evaluation of the effectiveness of sediment removal efforts. In summary, sediment removal activities can provide positive benefits in terms of enhancing SAV habitat and minimizing negative impacts on both vegetation and associated biota.
From page 113...
... If floating mats cover more than 25 percent of the surface of Landa Lake and dissolved oxygen concentrations decrease, then manual breaking up and removal of the floating mats should be considered as a mitigation measure. The Committee further recommends that monitoring the dissolved oxygen concentrations using the miniDOTs in selected areas of Landa Lake and Upper Spring Run be incorporated into an integrated water quality and biological monitoring program.
From page 114...
... However, the October 1 date does not necessarily reflect the lowest groundwater elevation, somewhat limiting its utility as a spring flow protection measure. As discussed in Chapter 2, the Committee recommends that Phase 2 of the HCP implement a Decision Support System to replace the triggers for the spring flow protection measures.
From page 115...
... Stage V Critical Management Period The Stage V Critical Management Period is an additional step beyond Stages I-IV that requires a pumping reduction of 44 percent from any ­ dwards Aquifer groundwater permit. The Stage V triggers for the San E Antonio Pool are a monthly average 625 ft groundwater elevation at well J-17 or if the Comal Springs flow rate reaches specific rates.
From page 116...
... 116 FIGURE 6-1  Water levels in J-17 well from 2010 to 2016. The bold line sits at 625 MSL.
From page 117...
... The EAA acquires leases of permitted Edwards Aquifer pumping, and this water is stored in the ASR system. When specified triggers are reached, SAWS will use water stored in the ASR as a base load supply in its area in the general vicinity of the springs, offsetting SAWS Edwards Aquifer demands.
From page 118...
... The information provided by SAWS did not provide sufficient data to address the potential issues of concern. As water-resource strategies evolve at the Twin Oaks ASR system, any changes in water sources to be mixed with Edwards Aquifer water should be assessed for water quality changes related to mixing of multiple sources, as well as water-rock interactions, to determine potential for adverse water quality changes.
From page 119...
... at a minimum of annually, determine specific injection at each ASR well to assess if there are any long-term changes in ASR well performance, (2) design and implement water quality monitoring for arsenic and related constituents in monitoring wells during recharge and storage events, and (3)
From page 120...
... If floating mats cover more than 25 percent of the surface of Landa Lake and dissolved oxygen concentrations decrease, then manual breaking up and removal of the floating mats should be considered as a mitigation measure. Monitoring of dissolved oxygen concentrations using the miniDOTs in selected areas of Landa Lake and Upper Spring Run should be incorporated into an integrated water quality and biological monitoring program.
From page 121...
... Edwards Aquifer Habitat Conservation Plan Contract No.


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