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7.5 Utilities: The City has adequate sanitary sewer, storm water, and water main infrastructure in place and plans for extensions to support the development project. The Public Works Department has reviewed the concepts and must approve all of these plans. 7.6 Mechanical Equipment: The placement of inechanical equipment can create visual and noise issues. Given the proposal, it is assumed that air conditioning units for town homes will be placed on the ground and in the case of the loft/condominium/vista structures it is assumed that heating, cooling, and ventilating equipment need to be affixed as wall units to the building facade, placed on the ground, or placed within roof cavities. Those units that are ground units should be screened from view. Should an emergency generator be contemplated for the housing buildings, the plans must indicate the proposed location. The generator must meet all applicable State decibel levels. Staff will work with Rottlund on addressing potential mechanical equipment issues. 7.7 Environmental: The entire Twin Lakes area is considered a"Brownfield". This means that the parcels contain some level of environmental contamination. The first significant contamination the city encountered was identified during the construction of Arthur Street and included benzene, creosote and construction adhesive as a result of the old construction company and bus painting operation previously located on the site. The clean up was significant and cost $3.8 million for which a hazardous substance subdistrict using tax increment financing was established to pay for the clean up. There are known locations of leaking fuel storage tanks within Twin Lakes, most of which have been identified and received "No Action or No Association Letters" from the Minnesota Pollution Control Agency. Under the terms of these letters existing uses on the site (e.g. truck terminals) can remain with the contamination in place and no further remediation will be mandated. However, once redevelopment occurs, a new standard of clean up will be required based upon the future use. For example, housing requires a higher level of clean up than commercial uses. For this reason, the existing property owners are not responsible for the costs of cleanup. This is the responsibility of the new development (Refer to letter from MNPCA associated with the legal requirements for contamination cleanup). The City has completed additional soil and ground water testing in Twin Lakes using $350,000 in US EPA funding. The limited soil testing indicated mostly petroleum contamination. The ground water testing did reveal one location within the Phase 1 area where hazardous contamination (TCE) was present at the deep (45 feet) ground water level. Because all habitable structures in Roseville use the centralized water system and water from the St. Paul Water Authority, this does not pose any eminent danger but will need to be more fully investigated prior to redevelopment. 8.0 DESIGN STANDARDS AND GUIDELINES: 8.1 Twin Lakes redevelopment is subject to Section ] O l 0 of the City Code relating to Design Standards. Additional Design Guidelines will be used as a guide to supplement the City Code requirements under Section 1010. Those include the original design guidelines prepared in 1988 and revised in 1996, as well as the design manual prepared in 2002. PF3790_RPCA_GeneralConcept_110106 Page 12 of 14