I-10 Twin Peaks Traffic Interchange, Environmental Assessment

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Affected Environment and Environmental Impacts October 2005 recommendations to prepare a project specific treatment plan (see letter in Appendix D). The cultural resources inventory report prepared for this proposed project recommended a determination of adverse effect because of proposed project impacts on two National Register-eligible properties: the Tucson-Casa Grande Highway (SR 84) and the Stewart Brickyard archaeological site. Although such effects would be considered adverse, they would be adequately mitigated at both sites. The Town of Marana would mitigate adverse effects to two National Register-eligible properties: the Tucson-Casa Grande Highway (State Route 84), and the Stewart Brickyard archaeological site. Effects to the Tucson-Casa Grande Highway would be mitigated effectively by collecting and documenting information in accordance with the 2002 Arizona Department of Transportation interim procedures for the historic state highway system. To prevent damage to possible buried resources at the Stewart Brickyard archaeological site, a preconstruction testing plan would be developed and implemented for this site by the Town of Marana in consultation with ADOT Environmental and Enhancement Group’s Historic Preservation Team. The testing plan would define locations of test excavations within this site to determine if significant archaeological deposits exist within the area of potential effect. The Historic Preservation Team would consult with the SHPO as required. Depending upon the results of the testing program, follow-up data recovery may be required also. Minor gaps in the cultural resources inventory would be addressed by the Town of Marana as final design proceeds. These include completion of the archeological survey on parcels that could not be surveyed previously along the eastbound I-10 frontage road and Linda Vista Boulevard because rights-of-entry could not be obtained. Archeological clearance would be obtained before geotechnical testing for bridge and embankment piers. According to Arizona Department of Transportation’s Standard Specifications for Road and Bridge Construction, Section 107.05 Legal Relations and Responsibility to Public, Archaeological Features (2000 Edition), if previously unidentified cultural resources are encountered during activity related to the construction of the project, the contractor shall stop work immediately at that location and shall take all reasonable steps to secure the preservation of those resources and notify the Engineer. The Engineer would contact the ADOT EEG, Historic Preservation Team (602.712.8636) immediately and make arrangements for the proper treatment of those resources. ADOT would, in turn, notify the appropriate agency(ies) to evaluate the significance of those resources. Agreement Documents SHPO, FHWA, ADOT, and the Advisory Council on Historic Preservation signed a Section 106 programmatic agreement for I-10 improvements between the I-10/I- 19 interchange and Tangerine Road in 1993 (see Appendix D). This agreement established protocol and procedures to be followed for cultural resource investigations within the area covered by the agreement. This programmatic Interstate 10 Traffic Interchange at Twin Peaks/Linda Vista 4-76 Project No.: NH-010-D (AIW) TRACS No.: 10 PM 236 H5838 01D
Affected Environment and Environmental Impacts October 2005 agreement, as revised to address research design for treatment of archaeological resources, has been followed for this proposed project and would continue to be followed throughout the remainder of the project. In addition, ADOT interim procedures for treating the historic state highway system were developed in 2002. These procedures require the collection and documentation of information from the historic highway before construction that would impact these facilities. SHPO Concurrence SHPO has reviewed the cultural resources report prepared for this project and has concurred with all of the eligibility findings except that of the Tucson-Casa Grande Highway. SHPO stated that the segment of roadway within the project area contributed to its eligibility to the NRHP and that a project specific treatment plan would be needed (see letter in Appendix D). Conclusion The cultural resources report prepared for this proposed project recommended a determination of adverse effect because of proposed project impacts on two National Register-eligible properties: the Tucson-Casa Grande Highway (SR 84) and the Stewart Brickyard archaeological site. A strategy for mitigating adverse effects on these facilities was developed. Potential impacts on four other nearby National Register-eligible properties were evaluated and the project was determined to have no adverse effect on the historic qualities that make those resources eligible. Three other resources within the area of potential effect were recommended as ineligible for the National Register, and two other previously recorded properties had been destroyed. Socioeconomics Demographics According to the U.S. Census Bureau, the study area consisted of five census tracts within Pima County and the Town of Marana (Census Tracts 44.16, 44.20, 46.29, 46.30, and 46.39), which represented a total 2000 population of 21,480. These census tracts are presented in Figure 4-5. Selected 2000 U.S. Census Bureau data from the five census tracts were compared to the same data for the Town of Marana, Pima County, and the State of Arizona in Table 4-10. Census data for these tracts is summarized in the following paragraphs. Census Tract 46.16 was the largest of the tracts, with a population of 8,841 persons. Housing in this tract tended to be newer (94% constructed 1990 or after) and more frequently occupied by the owner (90.7%) when compared to the other tracts, the Town of Marana, Pima County, and Arizona. This tract also had a higher median family income ($60,172) when compared to the other tracts, the Town of Marana, Pima County, and Arizona. This census tract could be Interstate 10 Traffic Interchange at Twin Peaks/Linda Vista 4-77 Project No.: NH-010-D (AIW) TRACS No.: 10 PM 236 H5838 01D
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I-10 Twin Peaks Traffic Interchange, Environmental Assessment

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