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Under contract with the Arizona Department of Transportation (ADOT), HDR Engineering, Inc. (HDR), has been tasked with the preliminary planning and predesign of a north-south highway corridor in Pinal County, Arizona (Federal Highway Administration Project No. STP-999-A [BBM]; TRACS No. 999 PN H7454 O1L). This highway will link Interstate 10 (I-10), in the vicinity of Picacho, to U.S. Highway 60 (also known as the Superstition Freeway), in the vicinity of Apache Junction. HDR has subcontracted with Statistical Research, Inc. to complete a Class I inventory of the study area. Report Submittal Number 2: May 2011

Salt River Project Agricultural Improvement and Power District (SRP) plans to construct an 88-mile-long 500-kV extra-high voltage transmission line linking the Pinal West, Santa Rosa, Pinal Central, Abel, and Dinosaur substations (ACC CEC Case No. 126). This report presents the results of Phase I data recovery (extent testing) and Phase II data recovery within a 40-m- (130-ft-) wide corridor at seven sites located on State Trust Land administered by the Arizona State Land Department (ASLD) (ASLD ROW No. 16-112288) and at seven sites and nine loci on the Gila River floodplain that are on privately owned lands between Pinal Central and Dinosaur. The sites are situated in north-central Pinal County east of the town of Queen Creek, east of Coolidge; and southeast and south-south of Coolidge. Phase I data recovery investigations were undertaken at 14 sites: AZ AA:2:304 (ASM); AZ AA:2:305 (ASM), AZ AA:3:281, AZ U:10:20 (ASM), AZ U:14:417 (ASM), AZ U:15:1 (ASM)/Adamsville, AZ U:15:61 (ASM)/Frogtown, AZ U:15:97 (ASM), AZ U:15:264 (ASM), AZ U:15:276 (ASM), AZ U:15:296 (ASM), AZ U:15:432 (ASM), AZ U:15:559 (ASM), and AZ U:15:560 (ASM). The sites were previously recommended eligible for inclusion in the National Register of Historic Places (NRHP) (Henderson et al. 2009) and the investigations were undertaken to comply with the Arizona Antiquities Act, the State Historic Preservation Act, and as required by the Arizona Corporation Commission Certificate of Environmental Compatibility. Fieldwork methods followed those outlined in the treatment plans (Phase I and Phase II data recovery) developed to mitigate impacts to the sites (Lindeman 2009; Lindeman et al. 2009). Michael Foster, Ph.D. served as Principal Investigator, and field work was directed by J. Scott Courtright. This is Submittal 3 of the report.

Salt River Project Agricultural Improvement and Power District (SRP) plans to construct an 88-mile-long extra-high voltage transmission line linking the Pinal West, Santa Rosa, Pinal Central, Abel, and Dinosaur Substations. The project corridor traverses the area from the Maricopa/Pinal County line west of the Ak Chin Indian Community, southeastward and eastward past Casa Grande, Arizona, then roughly northward past Coolidge and Florence, Arizona, ending east of Queen Creek, Arizona, along the western side of the Central Arizona Project Canal (CAP) (Figure 1). This document addresses cultural resources identified on Arizona State Trust Lands between the Pinal West and Dinosaur substations. Survey of nine segments of Arizona State Trust Lands between the Pinal West and Dinosaur substations was conducted by Henderson and her colleagues (Henderson et. al. 2008) (ASLD Right-of-Way Application Nos. 14-111003 [Pinal West to Santa Rosa section], 14-112542 [Santa Rosa to Pinal Central section], and 16-112288 [Pinal Central to Dinosaur section]) (Figure 2). The survey of State Trust Lands identified 13 archaeological sites in three segments. Eight of the sites—AZ U:10:20 (ASM), AZ U:14:417 (ASM), AZ U:15:61 (ASM), AZ U:15:62 (ASM), AZ U:15:97 (ASM), AZ U:15:264 (ASM), AZ U:15:432 (ASM) and AZ U:15:560 (ASM)-have been considered eligible for listing on the Arizona and National Registers of Historic Places and may contain subsurface remains that could be impacted by construction of the transmission line. All of the eligible sites are between the Pinal Central and Dinosaur Substations, ASLD Right-of-Way Application No. 16-112288. Three sites-AZ U:10:23 (ASM), AZ U:14:73 (ASM), and AZ U:15:99 (ASM)—are also Arizona/National Register-eligible, however, the project corridor crosses site areas that show no evidence of containing significant cultural remains, and the remaining two sites, AZ AA:1:95 (ASM) and AZ U:14:416 (ASM), have been determined or are considered ineligible for Arizona/National Register listing so construction will not impact significant cultural resources at these locations.

Class III cultural resources survey for an extra-high voltage transmission line connecting the Pinal West, Santa Rosa, Pinal Central, Abel, and Dinosaur Substations in Pinal County, Arizona.

This report presents the results of a Class III cultural resources survey of Arizona State Land right-of-way easements for a new extra-high voltage transmission line to be built between the Santa Rosa Substation, located south of the Ak Chin Indian Community, and the Dinosaur Substation, located east of the Town of Queen Creek, in Pinal County, Arizona (Figure 1). The proposed transmission line is part of the larger Pinal West to Abel/Browning (PW-ABL/BRG) 500 kV Transmission Line Project. The work was requested by the Salt River Project Agricultural Improvement and Power District (SRP) to determine if significant cultural resources were present that might be adversely affected by construction of the transmission line.