I-10 Twin Peaks Traffic Interchange, Environmental Assessment

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Affected Environment and Environmental Impacts October 2005 contamination in the project area, URS conducted a PISA of properties that may be affected by the proposed construction. The purpose of the PISA was to perform a screening-level assessment to identify potential conditions associated with hazardous materials associated with individual properties within the Study Area, and to identify those parcels requiring more detailed investigation. The assessment was based on the findings of a limited site reconnaissance, a review of aerial photographs, a review of Tucson City business directories, a review of historical ADOT R/W drawings, a review of federal and state environmental records, a review of Tucson Water As-Built Plans, and ADWR water well records. The complete results of the investigations are presented in the document Interstate 10 Traffic Interchange at Twin Peaks/Linda Vista Preliminary Initial Site Assessment, dated January 14, 2004. Readers are referred to this report for the detailed findings; however, the results are summarized below. Existing Conditions Based on the findings of this assessment, the study area parcels were identified as High, Medium or Low Priority for conducting further hazardous materials investigation work. Eleven parcels were identified as high priority. A high priority rating was assigned to parcels with a history of commercial or industrial use or that were identified in the environmental agency databases. The designation of a parcel as a high priority site did not mean that known hazards were present on the parcel. All sites designated as high priority were located in the commercial area on the west side of I-10. The 11 sites were designated high priority because of the following existing or historic land uses and the hazardous materials they may have used, handled, stored, or disposed: • Roofing company and manufacture of steel products – solvents and processing chemicals • Manufacture of pre-cast or molded products – solvents, petroleum • Auto repair – petroleum and solvents • Mechanical equipment maintenance and storage, plant nursery – pesticides, solvents, petroleum • Heavy equipment sales and rentals – petroleum • Auto salvage yard, recorded leaking underground storage tanks (LUST) – petroleum • Heavy equipment sales and rentals, equipment maintenance – petroleum and solvents • Adjacent to site with reported fuel spills, fuel storage – petroleum • Site of reported fuel spills, fuel storage – petroleum • Unregistered historic underground storage tanks (UST), heavy equipment usage – petroleum Interstate 10 Traffic Interchange at Twin Peaks/Linda Vista 4-64 Project No.: NH-010-D (AIW) TRACS No.: 10 PM 236 H5838 01D
Affected Environment and Environmental Impacts October 2005 • Equipment rentals, landscaping, fuel storage – petroleum Four parcels were identified as medium priority. These parcels were identified as having a lesser potential for hazards due to unknown historical usage or indications of dumping. Nineteen parcels were identified as low priority sites. Low priority parcels are considered to have a low likelihood of encountering hazardous materials. According to Tucson Water, most of the larger water supply lines in the project area were cement asbestos. Twelve-inch cement asbestos water lines served the commercial parcels on the west side of I-10 along the western property lines. A 12-inch cement asbestos water supply line brought water into Continental Ranch approximately along the centerline of Twin Peaks Road. There were numerous private wells in the area as well. According to the ADWR, at least 21 registered wells were located near the study area; however, there may also be other, unrecorded wells within the area. All properties in the commercial area on the west side of I-10 within the project area disposed of liquid waste in individual septic tanks. Impacts No Build Alternative Because existing soils would remain undisturbed, no impacts from hazardous materials would result from the no build alternative. Preferred Alternative The preferred alternative would acquire additional R/W from all properties in the commercial area on the west side of I-10 within the project area. As a result, all properties noted as high or medium priority in the PISA for this project would be affected by the preferred alternative. In addition to R/W acquisition, soils on several of the properties would be disturbed by the construction of the preferred alternative; therefore, the possibility of encountering hazardous materials would be increased from these activities. Subsurface ground disturbance during construction could affect also asbestos-containing water supply lines, private wells, and individual septic tanks located on these properties. Mitigation Before construction, the Town of Marana would conduct detailed Phase I Site Assessments to assess site-specific potential for hazardous materials issues on parcels rated as high and medium priority. Additional investigation may include, but is not limited to, additional site reconnaissance and interviews with current and historical property owners. If parcels to be acquired involve structures, following the acquisition of the structure but prior to its demolition, the structures would be assessed for asbestos, lead-based paint, and other hazardous materials in accordance with State and Federal regulations. The Town of Marana would review sellers’ disclosure statements and title records of acquired properties for indications of hazardous materials usage and/or disposal Interstate 10 Traffic Interchange at Twin Peaks/Linda Vista 4-65 Project No.: NH-010-D (AIW) TRACS No.: 10 PM 236 H5838 01D
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Interstate 10 Traffic Interchange a
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Draft Environmental Assessment Octo
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Mitigation Measures October 2005
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AVRA VALLEY RD MARANA I-10 SCENIC D
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Introduction October 2005 Cortaro R
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Conclusion October 2005 Interstate
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Bibliography October 2005 CHAPTER 8
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Bibliography October 2005 Tetra Tec
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I-10 Twin Peaks Traffic Interchange, Environmental Assessment

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