american samoa - University of Hawaii at Manoa Botany Department

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Comparative Benefits and ImpactsPPC’s evaluation of the three alternate restoration and enhancement strategies is summarized inTable 10-6.TABLE 10-6COMPARATIVE EVALUATIONRIPARIAN RESTORATION AND ENHANCEMENT OPPORTUNITIESLOWER ASILI STREAMOptionProjectCostResidentialLand UsesSubsistenceAgricultureFish &InvertebrateHabitatWetland/RiparianVegetationStreamBankStabilityFloodHazards &PropertyDamage1 LC LB SB NBC SB MB NBC2 MC LB LB NBC NBC SB LBNotes: Potential project benefits were rated by PPC as follows:SB Significant project benefitsLC Limited undesirable consequencesMB Moderate project benefitsMC Moderate undesirable consequencesLB Limited project benefitsSC Significant undesirable project impactsNBC No anticipated project benefits orundesirable consequencesSource: Pedersen Planning Consultants, 2000Option 1 provides an initial cleanup of lower Asili Stream. The greater benefits associatedwith this option include the planting of ifi and falaga trees that will help stabilize stream banks,particularly in adjacent subsistence plantations. Greater stabilization of stream banks wouldhelp reduce bank erosion along lower Asili Stream. Project costs would be somewhat less thanthose required to implement Option 2.Option 2 would also address significant bank erosion and changes in stream hydrology in thevicinity of station 10+00. This project would provide needed stream stabilization along thewest bank of the stream and help restore the flow path of Asili Stream in this area. Oneresidence immediately downstream of this proposed improvement would benefit from potentialproperty damages that may occur if needed stream bank stabilization is not constructed.Recommended Option and Estimated Project CostThe cleaning of the 1,000-foot segment of Asili Stream and the planting of additional riparianvegetation (Option 1) is recommended for implementation. This wetland restoration project isrecommended because the project can enhance wetland vegetation and stabilize stream banksadjacent to smaller subsistence plantations.The costs associated with this project would primarily be associated with the initial clearing,removal and disposal of solid waste material from the lower reach of Asili Stream, as well asthe subsequent collection and planting of ifi and falaga tree cuttings by the ASCC Land GrantProgram.The estimated cost associated with the initial clearing of the 1,000-foot segment of lower AsiliStream is $3,126 (Table 10-7). The propagation and planting of 50 native riparian trees willcost an estimated $2,2 41 (Table 10-8). Consequently, the total estimated project cost would be$5,367.TABLE 10-7PRELIMINARY COST ESTIMATEAmerican Samoa Wetlands/Streams Restoration and Enhancement PlanFebruary 2001, Asili Stream, Page 10-12
CLEAN-UP OF LOWER ASILI STREAMLABORPersonnel Number Hours Hourly Rate ($) Cost ($)Supervisor 1 24 15 360Heavy Equipment Operator 1 24 13 312Laborer 4 24 6 576All Personnel 6 144 $1,248MATERIALSItem Quantity Unit Cost ($) Cost ($)Picks 4 15 60Sledge Hammers 4 25 100Shovel 4 22 88Weed-eaters 4 300 1,200Machetes 4 20 80Garbage Bags 30 boxes 5 150Wheel Barrows 4 50 200All Materials $1,878TOTAL LABOR AND MATERIALS $3,126Notes: Preliminary estimate assumes use of existing equipment that is owned by the ASG Department of Public WorksSource: Pedersen Planning Consultants, 2000TABLE 10-8PRELIMINARY COST ESTIMATEPROPAGATION AND PLANTING OF NATIVE RIPARIAN TREESLOWER ASILI STREAMLABORPersonnel Number Hours Hourly Rate ($) Cost ($)ASCC Plant Nursery Technician 1 104 10 1,040ASCC Field Crew Leader 1 4 8 32ASCC Field Crew Members 2 4 6 48All Personnel 4 116 $1,120MATERIALSItem Quantity Unit Cost ($) Cost ($)Native Riparian Trees 50 3 150Garbage Bags 20 boxes 5 100All Materials $250EQUIPMENTShovels 3 22 66Machetes 3 20 60Picks 3 15 45Wheel Barrows 2 50 100Weed-eaters 2 300 600All Equipment $871TOTAL LABOR AND MATERIALS $2,241Notes: Preliminary estimate assumes use of existing equipment that is owned by the ASG Department of Public WorksSource: Pedersen Planning Consultants, 2000Long-Term Monitoring and Site Maintenance RequirementsAmerican Samoa Wetlands/Streams Restoration and Enhancement PlanFebruary 2001, Asili Stream, Page 10-13
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Asili StreamAMERICAN SAMOAWETLAND/S
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American SamoaWetland/Stream Restor
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American Samoa Wetland/Stream Resto
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Figure 1-1Location of Potential Wet
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Onsite InvestigationsNovember 1999G
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Where appropriate, stream cross sec
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Chapter TwoTULA WETLANDLOCATIONTula
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Figure 2-2Tula WetlandExisting Cond
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Improved channelization of stormwat
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LAND USES IN THE VICINITY OF TULA W
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Figure 2-3Option 2: Detention of St
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Figure 2-4Option 3: Expansion of Ta
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Comparative Benefits and ImpactsPPC
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TABLE 2-4PRELIMINARY COST ESTIMATEP
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TABLE 2-5LONG-TERM RESOURCE MONITOR
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TABLE 2-6 (CONTINUED)FIELD MONITORI
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Chapter ThreeALAO WETLANDLOCATIONAl
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Figure 3-2Taufusi MarchExisting Con
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Figure 3-3FEMA 100-Year Flood Plain
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East Portion of the MarshThe impact
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WETLAND RESTORATION AND ENHANCEMENT
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The availability of new, blight-res
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Long-Term Monitoring and Site Maint
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TABLE 3-7FIELD MONITORING WORKSHEET
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Recommended monitoring stations or
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Figure 4-1Location MapAoa Village W
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No stream flow estimates are availa
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Fresh-Water SwampThe fresh-water sw
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ecome dominant if there is a nearby
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Relative Abundance and Diversity of
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Option 4: Restore Mangrove Forest U
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TABLE 4-5COMPARATIVE EVALUATIONWETL
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Long-term resource management activ
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• begin at the Tapua Stream mouth
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Figure 5-1Location MapSoutheast Wet
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Tufu Stream and two stream branches
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Mr. Whistler was part of a three-pe
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InvertebratesCrustacean densities w
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FIGURE 5-3OPTION 1: RESTORE RIPARIA
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TABLE 5-4COMPARATIVE EVALUATIONWETL
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Long term monitoring of the Vatia w
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More specific monitoring of stream
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Figure 6-1Location MapVaipito Strea
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Stream FlowsHistorical Stream Flows
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California grass (Brachiaria mutica
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FIGURE 6-3FISH AND INVERTEBRATE SUR
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Most of lower Vaipito Stream segmen
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Red mangrove should be planted with
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TABLE 6-7PRELIMINARY COST ESTIMATEC
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TABLE 6-10 (Continued)FIELD MONITOR
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Vehicular and pedestrian access to
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Figure 7-1Location MapLeele-Papa-Ta
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Stream flow, in some cases, is cons
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Stormwater Discharges and Related F
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AQUATIC FISH AND INVERTEBRATESGener
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Opportunities and StrategiesOption
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Figure 7-3Option 2: Reduction of Er
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TABLE 7-8PRELIMINARY COST ESTIMATEP
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Page 129 and 130: TABLE 7-10 (Continued)FIELD MONITOR
Page 131 and 132: More specific monitoring of stream
Page 133 and 134: Figure 8-1Location MapSauino Stream
Page 135 and 136: Stream FlowsHistorical Stream Flows
Page 137 and 138: AQUATIC FISH AND INVERTEBRATESGener
Page 139 and 140: Figure 8-3Option 1: Construction of
Page 141 and 142: FIGURE 8-5OPTION 2: PLANT NATIVE RI
Page 143 and 144: Long-Term Monitoring and Site Maint
Page 145 and 146: TABLE 8-8FIELD MONITORING WORKSHEET
Page 147 and 148: TABLE 8-8 (Continued)FIELD MONITORI
Page 149 and 150: LOCATIONChapter NineLEAFU STREAMLea
Page 151 and 152: Figure 9-2Leone Pala and 300-Foot L
Page 153 and 154: However, during and following heavi
Page 155 and 156: Vegetation TrendsThe lower Leafu St
Page 157 and 158: LAND USES ADJACENT TOLOWER LEAFU ST
Page 159 and 160: Option 2: Construct Basaltic Wall,
Page 161 and 162: Figure 9-5:Stabilize East Stream Ba
Page 163 and 164: TABLE 9-7PRELIMINARY COST ESTIMATEP
Page 165 and 166: TABLE 9-8LONG-TERM RESOURCE MONITOR
Page 167 and 168: TABLE 9-9 (Continued)FIELD MONITORI
Page 169 and 170: Chapter TenASILI STREAMLOCATIONAsil
Page 171 and 172: Figure 10-2Asili Stream SegmentExis
Page 173 and 174: Stormwater Discharges and Related F
Page 175 and 176: Further downstream, the stream chan
Page 177 and 178: TABLE 10-4SUMMARY OF MACROFAUNAL OR
Page 179: American Samoa Wetlands/Streams Res
Page 183 and 184: TABLE 10-9LONG-TERM RESOURCE MONITO
Page 185 and 186: TABLE 10-10 (Continued)FIELD MONITO
Page 187 and 188: Vehicular and pedestrian access to
Page 189 and 190: Figure 11-1Location MapFusi Wetland
Page 191 and 192: WETLAND VEGETATIONNovember 1999 Sur
Page 193 and 194: The lack of stream flow entering th
Page 195 and 196: Figure 11-3Option 1: Remove Solid W
Page 197 and 198: Recommended Option and Estimated Pr
Page 199 and 200: TABLE 11-6FIELD MONITORING WORKSHEE
Page 201 and 202: Any future monitoring stations or s
Page 203 and 204: Project ManagerRepresentatives of a
Page 205 and 206: REFERENCESBiosystems Analysis, Inc.
Page 207 and 208: APPENDIX ASUMMARY OFPLANTSOBSERVED
Page 209 and 210: Species Family EnglishNameSamoanNam
Page 213: APPENDIX CSUMMARY OFAQUATIC MACROFA
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