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Design of US Habitat Banking Systems to Support the Conservation ...

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APPENDIX GWETLAND MITIGATION BANKING: SUMMARY CHART (continued)Study Location Description Results: Permit Success Results: Ecological Success Notes: WildlifeTurner et al.(2001)Wilson andMitsch (1996)– From NRC(2001)Zedler andLangis (1991),Zedler andCallaway(1999), Zedleret al. (1997) –From Ambrose(2000)Zenter (1987)– FromAmbrose(2000)NationwideCaliforniaCaliforniaDetailed analysis <strong>of</strong> peer reviewed andgrey literature on <strong>the</strong> performance<strong>of</strong> wetland mitigation under §404 --includes Sudol 1996, Allen and Feddema1996 and DeWeese 1994Evaluated 5 wetland projects in detail forpermit compliance and function.An extensive study on two mitigationprojects in San Diego.Qualitative examination <strong>of</strong> 63 coastalwetland res<strong>to</strong>ration projects.In eight reviewed studies <strong>the</strong> proportion<strong>of</strong> mitigation initiated ranged from 28- 100 percent. In 19 studies <strong>of</strong> permitcompliance, 10 found a majority <strong>of</strong>projects <strong>to</strong> be in compliance, 9 studiesfound that only 4 - 49 percent <strong>of</strong> <strong>the</strong>projects were compliant. In 8 studies <strong>of</strong>5 state permitting programs, 2 foundthat area <strong>of</strong> mitigation achieved equaledor exceeded <strong>the</strong> area <strong>of</strong> wetland lost,6 found <strong>the</strong> opposite. 9 studies <strong>of</strong> 4state permitting programs found fewerhectares <strong>of</strong> mitigation was implementedthan required by permits (average <strong>of</strong> .69hectares per hectare lost).2 <strong>of</strong> 5 projects were in full legal compliance,four <strong>of</strong> five were on <strong>the</strong> trajec<strong>to</strong>ry<strong>to</strong> full compliance.A review <strong>of</strong> studies on mitigation successfound that 21 percent <strong>of</strong> mitigation sitesmet various tests <strong>of</strong> ecological equivalency<strong>to</strong> functions lost (0 - 67 percentfunctionality), <strong>the</strong> compliance rate for<strong>the</strong>se sites was 6 - 100 percent.24.4 hectares were lost <strong>to</strong> impacts and 16hectares were actually created or res<strong>to</strong>red-- a net loss in wetlands.Five years after <strong>the</strong> construction <strong>the</strong> mitigationdid not meet 10 <strong>of</strong> 11 ecosystemfunctions, but did have a fish assemblagethat was comparable <strong>to</strong> wetland referencesite.65 percent exhibited roughly typicalwetland values as similar, unres<strong>to</strong>redwetlands.110 Environmental Law Institute

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