I-10 Twin Peaks Traffic Interchange, Environmental Assessment

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