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SEA11A15DOC003670213 The alignment would cross through the proposed D


SEA1-1A15DOC003670213 the increased costs of the project associated with the construction of the tunnel thesubstantial impacts to the regional stormwater detention facilities and to the highestcategor

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Document on Subject : "SEA11A15DOC003670213 The alignment would cross through the proposed D"— Transcript:

1 SEA1-1A15.DOC\003670213 The alignment wo
SEA1-1A15.DOC\003670213 The alignment would cross through the proposed Des Moines Creek Basin Plan regionaldetention facilities, reducing the envisioned stormwater storage capacity byapproximately 50 acre-feet (roughly one-third of the proposed increased capacity ofRegional Pond #1/Northwest Ponds).Approximately 9 acres of a Class 1 wetland and its associated buffer (roughly 39 percentof the entire wetland) would be filled.Between 371 and 470 residential units would be displaced (31 to 45 percent of the totalwould be homes in the large mobile home parks south of South 200th Street and east ofNeither o

2 f the other two original EIS Build alter
f the other two original EIS Build alternatives (B or D) is an avoidance alternative.Alternative B would cross through the park, albeit it at its narrowest point, require theacquisition of approximately 0.5 acres of parkland, and essentially divide the park into twosections. Figure 2 illustrates the specific area of park impact. The enjoyment of the trailbelow the roadway bridges may be diminished by the visual intrusion of the bridges, theloss of the trees during construction of the bridges, additional shading created by the bridgestructures, and the resulting traffic noise. Like Alternative B, Alter

3 native D would bridge theDes Moines Cree
native D would bridge theDes Moines Creek Trail, resulting in proximity impacts similar to those described above (seeFigure 3).Value Engineering Study RecommendationIn February 1999, the Washington State Department of Transportation (WSDOT) assembleda VE team to evaluate the three original EIS Build alternatives. The VE team concluded thatmany of the adverse impacts of the EIS alternatives, and particularly Alternative C (theSection 4(f) avoidance alternative), were a direct result of a specific design constraint thathad shaped the development of the EIS alternatives, namely the avoidance of Des Moine

4 sCreek Park. After extensive discussions
sCreek Park. After extensive discussions among the VE team members, it was recommendedthat that particular constraint may be unreasonable considering the complexity of theproject area and that new options to Alternative C developed without that constraint shouldbe considered.Several new options were developed that, even though they impact the park to varyingdegrees, avoid or minimize other undesirable adverse impacts of Alternative C. A previouswhite paper entitled Screening of Value Engineering Study Alignment RecommendationsJune 9, 1999, outlines in detail the various new options developed and evalu

5 ated. As a resultof a two-level screenin
ated. As a resultof a two-level screening process and a structured decision-making process in which theSteering Committee participated over a period of several months, two options to AlternativeC were eventually identified and recommended to be included in the EIS, along withAlternative C (and B and D).Value Engineering Study AlternativesThe two new VE Study-generated options to Alternative C have been designatedAlternatives C2 and C3; Alternative C has been redesignated Alternative C1. Alternative C2would divert from the existing SR 509 right-of-way farther south than would SEA1-1A15.DOC\003670213 th

6 e increased costs of the project associa
e increased costs of the project associated with the construction of the tunnel, thesubstantial impacts to the regional stormwater detention facilities and to the highestcategory of wetlands, and the displacement of a large number of residents. WSDOT wasalso of the opinion that despite impacts to Des Moines Creek Park resulting fromAlternatives C2 and C3, both of these alternatives were prudent because they would avoidor minimize the extraordinary and imprudent impacts caused by Alternative C1.It should also be noted that, based on an extensive analysis of avoidance alternatives as partof the ongoing

7 Section 4(f) study, WSDOT has conclusive
Section 4(f) study, WSDOT has conclusively determined there are no otherfeasible and/or prudent alternatives that avoid impacts to the Des Moines Creek Park.Meetings with Agencies of JurisdictionAs part of the determination of whether Alternatives C1, C2, and C3 are feasible and/orprudent alternatives, WSDOT solicited the input of the parks directors and other staff of thetwo communities that own, operate, and maintain Des Moines Creek Parkthe cities ofSeaTac and Des Moines. A meeting of these officials was held on July 19, 1999.(Representatives of the two cities, the Port of Seattle, WSDOT, and the

8 Federal HighwayAdministration [FHWA] wer
Federal HighwayAdministration [FHWA] were present.) The consensus of the group was that AlternativesC2 and C3 appeared feasible and prudent and should be included in the EIS, along theAlternatives B, C1, and D. The primary issue of discussion related to appropriate mitigationfor the impact to the park. The SeaTac Parks Director argued that because the envisionedpark impacts of Alternatives C2 and C3 would occur within the SeaTac-owned portion ofthe park, any mitigation proposed should also be located in SeaTac. SeaTac proposed thatacceptable mitigation for the park "take" would be continuation of the

9 Des Moines CreekTrail north of its curre
Des Moines CreekTrail north of its current terminus at South 200th Street along the SR 509 alignment to aneventual connection to a proposed trail on the west side of the airport (with linkages toregional trail facilities in the future). WSDOT expressed a willingness to work with the Cityto accommodate this trail extension within the design of the SR 509 extension. The SeaTacParks Director also noted that because the park was acquired, in part, through the use of"Forward Thrust" funds, WSDOT would need to identify replacement land of reasonablyequivalent recreational utility per the requirements of Sec

10 tion 6(f) of the U.S. Land andWater Cons
tion 6(f) of the U.S. Land andWater Conservation Act. It was suggested that land within the adjacent SR 509 right-of-waycould possibly be used for replacement property.WSDOT also conferred with FHWA regarding the issue of feasible and/or prudentalternatives at a meeting on August 26, 1999. FHWA concurred with WSDOT's initialopinion that Alternative C1 would not be a prudent alternative, even though it is a Section4(f) avoidance alternative. FHWA also concurred that Alternatives C2 and C3, despite theirimpacts to Des Moines Creek Park, were feasible and prudent alternatives that should beincluded in th