Powerline Plan and Environ. Assessment Jan. 2013 - Flood Control ...

More documents

Recommendations

Info

Powerline Flood Retarding Structure Pinal County, AZ Draft Supplemental Watershed Plan and Environmental Assessment A Class III cultural resource survey was completed in December 2009 for geotechnical studies related to the PVR FRSs Rehabilitation or Replacement Project. The survey entitled, Class III Cultural Resources Survey Along the Powerline, Vineyard, Rittenhouse Flood Retarding Structures Between Queen Creek and Apache Junction, Pinal County, Arizona (Jones and Florie 2009) included the results of a “site file check” as well as those of the field survey for the specific geotechnical work that was to be performed. The review area for the PVR FRSs 2009 cultural resource study is a one mile buffer around the PVR FRSs structures. The 2009 Class III report was prepared in compliance with the National Historic Preservation Act of 1966 (as amended); Arizona State Antiquity laws (A.R.S. § 41-841 et seq); and the State Historic Preservation Act (A.R.S. § 41-861 through § 41-864). The site file check for the review area (including the one mile buffer) that was conducted as a component of that report included site records and project files at the State Historic Preservation Office (SHPO) and the AZSITE cultural resource database. Hereinafter, the site file check component of the 2009 Class III survey effort is referred to as the “2009 cultural resource study”. Previous Research The 2009 cultural resource study indicated that at least 59 cultural resource investigations/surveys have taken place within the review area. Most of these previous survey areas are linear in nature and cut across the review area. Nine of these surveys are over 10 years old and therefore would require re-evaluation and resurvey in accordance with SHPO guidance. Two other investigations were extensive block surveys, conducted for the Lost Dutchman Heights project areas. These surveys covered portions of the review area in the vicinity of the Powerline FRS. Previously Recorded Cultural Resources Within the review area there were 72 previously recorded archaeological sites and one archaeological district identified in the 2009 cultural resource study. Though the vast majority of these sites are prehistoric artifact scatters, some with features of habitation sites (approximately 69), there are several historic sites and an archaeological district. Of the 72 previously recorded sites, seven have been determined eligible for the National Register of Historic Places (NRHP); 33 are Recommended as eligible for the NRHP; two have been Determined as not eligible; six are Recommended as not eligible; and 24 have not been evaluated. The archaeological district is Recommended as eligible . (Note: Sites “Determined” eligible/not eligible have been evaluated by the SHPO; sites “Recommended” have been evaluated only by their recorder and not the SHPO). Conclusions and Recommendations The Sponsor is presently conducting a Class III cultural resources survey for the area of potential effect (APE) for the Preferred Alternative. The purpose of the survey is to conduct a site reconnaissance of the APE for identification and location of cultural resource sites. The completion of the site survey is anticipated in late spring 2013. The cultural resources survey will also identify potential sites that may require mitigation. Mitigation will be conducted in a phased approach prior to construction of the elements of the PVR preferred alternative. As noted above previous cultural resources surveys and research in the vicinity suggest that there would be a significant number of archaeological sites located within the area of potential effects for USDA- NRCS Page 4-11 January 2013 Kimley-Horn and Associates, Inc.
Powerline Flood Retarding Structure Pinal County, AZ Draft Supplemental Watershed Plan and Environmental Assessment the project. Sites in the APE that will not be subject to project-related impacts will be avoided by project implementation activities. Data recovery studies will be performed to mitigate impacts to all sites likely to suffer project-related impacts. Based on known sites in the vicinity, the majority of the cultural resources present would be either prehistoric sites without evidence of habitation (which might include scatters of artifacts on the surface, or artifacts with remnants of just one or a few roasting pits, agricultural features, and/or other non-habitation features) or historical sites (which might include homesteads, farming or ranching features, or simply scatters of historical artifacts). Most of the remaining sites would be smaller prehistoric habitation sites, with up to two relatively large prehistoric habitation sites. Based on experience with recent data recovery efforts in central and southern Arizona, cultural resources mitigation costs have been estimated. Formal consultation with the Arizona State Historic Preservation Office (SHPO) has been recently initiated following identification of the Preferred Alternative. The initial SHPO consultation correspondence is on file with the NRCS. Consultations with SHPO will continue through the design phase as final alignments, borrow materials, and other disturbance areas are further identified. Formal consultations with Tribal Historic Preservation Offices (THPOs) have recently been initiated following identification of the Preferred Alternative. Consultations with THPOs will continue through the design phase as final alignments, borrow materials, and other disturbance areas are identified. 4.19 STATUS OF OPERATION AND MAINTENANCE The current “Operation and Maintenance Agreement” (O&M) for the Powerline FRS is dated June 20, 1990. The agreement is between the NRCS and the District. The Flood Control District is the local Sponsor. The current operation and maintenance activities include annual inspections, crest surveys, sediment and debris removal activities, repair of erosion features, and weed and rodent control/abatement. 4.20 HAZARD CLASSIFICATION The FRS is designated as a high hazard structure by ADWR and NRCS. High-hazard-potential structures are defined as, “dams located where failure may cause loss of life, serious damage to homes, industrial and commercial buildings, important public utilities, main highways, or railroads.” In addition, because of the potential loss of lives and property damage that could occur in the event of failure, the structure was classified by ADWR as an “intermediate” sized structure with a “high-hazard” potential. 4.21 POTENTIAL FAILURE MODES As noted in the previous section, ADWR and NRCS both classify the Powerline FRS as a high hazard dam with the potential for loss of life if the dam was to suddenly fail. Potential failure modes were identified and qualitatively evaluated in the “Final Failure Mode and Effects Analysis Report: Cave Buttes Dam, Powerline FRS, Vineyard Road FRS, Rittenhouse FRS, Spook Hill FRS, Signal Butte FRS, and Apache Junction FRS ”(KHA, July 2002). The FMEA identified three Category I and three Category II potential failure modes. The potential failure modes are listed below. USDA- NRCS Page 4-12 January 2013 Kimley-Horn and Associates, Inc.
Page 1 and 2: DRAFT SUPPLEMENTAL WATERSHED PLAN A
Page 3 and 4: Powerline Flood Retarding Structure
Page 31: Powerline Flood Retarding Structure
Page 83 and 84:
Powerline Flood Retarding Structure
Page 85 and 86:
Page 87 and 88:
Page 89 and 90:
Signal Butte Rd Meridian Rd Ironwoo
Page 91:
POWERLINE FRS TYPICAL SECTION
Page 95 and 96:
Ironwood Rd Gantzel Rd Mountain Vie
Page 97 and 98:
Figure 22 Figure 21 - Conceptual Mu
Page 99 and 100:
K:\PHX_WaterResources\91131019\CADD
Page 101 and 102:
K:\PHX_WaterResources\91131019\CADD
Page 103 and 104:
Exhibit A-2 - Emergency Spillway Di
Page 105 and 106:
Price Price Price Dobson Alma Schoo
Page 107 and 108:
Page 109 and 110:
Page 111 and 112:
Page 113 and 114:
Page 115 and 116:
Page 117 and 118:
Page 119 and 120:
Page 121 and 122:
Page 123 and 124:
Page 125 and 126:
Page 127 and 128:
Page 129 and 130:
Page 131 and 132:
Page 133 and 134:
Page 135 and 136:
Page 137 and 138:
Page 139 and 140:
Page 141 and 142:
Page 143 and 144:
Page 145 and 146:
Page 147 and 148:
Page 149 and 150:
Page 151 and 152:
Page 153 and 154:
Page 155 and 156:
Page 157 and 158:
Page 159 and 160:
Page 161 and 162:
Page 163 and 164:
Page 165 and 166:
Page 167 and 168:
Page 169 and 170:
Powerline, Vineyard Road and Ritten
Page 171:
show all

Powerline Plan and Environ. Assessment Jan. 2013 - Flood Control ...

Create successful ePaper yourself

Delete template?

Save as template?