Site Development

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site layout and grading key
to project's success

Sunnybrook Village, Sioux City, IA

Project Owner:
AP Sioux City, Dallas, TX

Key Experience:

  • Building Layout Coordination
  • Site Access
  • Site Utilities
  • Significant Site Grading

Key Features:

  • 42-acre retail development
  • Two primary retail buildings
  • Four outlots
  • Free-standing buildings

The area’s growing population had generated demand for additional shopping options in Sioux City, Iowa. DGR Engineering (DGR) worked with the developer and initial tenants to develop a 42-acre retail subdivision on the south end of Sunnybrook Drive.

Prior to 2000, the area consisted of farm ground and an open ditch. The Sunnybrook Plaza project included installation of a 3,000 ft. box culvert through the site and grading to fill in the ditch. Also included in the project were utilities, a lift station, site grading and paving of Sunnybrook Drive to support the two main anchors, Target and Lowe’s, along with six other lots for future tenants.

Later, DGR projects included additional grading and paving of Sergeant Road, the extension of Sunnybrook Drive to Christy Road, and preliminary grading for the future site of Sunnybrook Village.

DGR worked with the developer to put together a preliminary layout for the site. However, when Fleet Farm expressed interest in putting a 200,000+ square foot building on the site, a significant revision was needed to fit the larger building footprint and required parking on the site.

The use of AutoCAD Civil3D® allowed DGR to redesign the site plans by moving the building pad back toward the hill and steepening the slope behind the building. Coordination between multiple entities to create a mutually satisfying layout of buildings, parking area, utilities and street access was a main element of the planning process.

The current construction will provide 274,000 square feet of retail space for Fleet Farm and Hobby Lobby, a free-standing Fleet Farm car wash/gas station/convenience store and room for an additional 44,900 square feet of retail space. 1,208 parking stalls will be provided in the initial phase of construction. Future development on the site will include four outlots for future stores or restaurants, as well as space for one additional free-standing building.

A challenge this job presented was the existing flood plain designation along Sunnybrook Drive. Documenting DGR’s previous design work on grading and storm drainage work enabled DGR to work with FEMA to obtain a Letter of Map Revision (LOMR). This removed the flood plain designation, allowing work to move forward on the project.

Site utilities include installation of water main and sanitary sewer to serve each building, as well as storm sewer to collect site runoff. The runoff will be delivered to an existing 72” storm sewer along the front of the site. It will then be carried into the existing storm water detention area on the south side of Christy Road.

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