Site work for a water / sewer project in Tucson, Arizona. Completed plans call for site work for a water / sewer project.

City of Tucson, hereinafter referred to as "City", is conducting a competitive ONE-STEP process to select a qualified construction manager/general contractor to provide design phase assistance for complete construction service as the Construction Manager at Risk for construction improvements to the 20 million (MG) Martin Reservoir facility. This facility is located approximately 1 mile east of the intersection of Nogales Hwy and Valencia Road. The directions to the site will be provided at the pre-submittal meeting and the site visit will follow the completion of the pre-submittal meeting. 30 minutes for travel from downtown to the project site is suggested. The Martin Reservoir is a partially buried, circular shaped, hopper bottom style reservoir with a 3-inch thick reinforced concrete floor. It has 2-foot high, 14-inch thick reinforced concrete walls. The roof consists of precast concrete double tee (PCDT) beams supported by precast concrete inverted tee girders on concrete columns. The top surface of the roof is covered with a three-ply built-up roofing system. The floor and side slopes of the interior of the reservoir are covered with a Sherwin Williams Sherflex epoxy spray coating liner system that was installed in 2011. The diameter of the reservoir is approximately 430 feet and has a maximum water depth of 24 feet at overflow. The ring wall is constructed in two parts. Below ground is a 14-inch think cast in place concrete wall with spread footer, while the top layer above grade is brick. The total height of ring wall is approximately 5 1/2 -ft from top of roof to bottom of concrete footer. The side slopes are minimum 3-inch thick cast in place concrete, installed at a 2 to 1 slope. The primary access to the reservoir site is provided through a 16-foot wide double-swing chain-link gate near the south corner of the site off Park Avenue, just south of Valencia Road. The site is entirely covered with a thin layer of gravel. At the time of the condition assessment, the site contained almost no vegetation, aside from a few trees growing on the north and west reservoir embankments. These trees have since been removed. A 7-foot high chain-link fence with barbed-wire top surrounds the site. Plant No. 5 and the chlorination building are located on the south end of the site near the main entrance along the southeast fence line. The other two booster pump stations are located west of Plant No. 5 along the southwest fence line. A site plan is shown in Figure 1. The reservoir is accessed on foot by a 3-foot wide concrete stairway running up the embankment in the southwest corner of the reservoir. Vehicular access up the embankment is not possible, therefore the O&M road runs around the base of the embankment. A 4-foot wide concrete gutter runs around the perimeter of the reservoir to capture drainage from the roof and serves as a sidewalk. The reservoir roof is accessed via a short flight of stairs that are concrete at the bottom, and fiberglass near the top of the stairway. Access into the reservoir is through a 3 x 5-foot hatch. Inside this hatch, a steel ladder descends approximately 6 feet into the reservoir to a small landing at the top of the side slope. A concrete stairway then leads down the side slope to the reservoir floor. Two rectangular equipment access hatches are present in the northwest and northeast quadrants of the roof. Water is supplied to the reservoir from a number of groundwater wells in the Santa Cruz well field, Valencia Standpipe and now Eisenhower Reservoir through a 36-inch diameter inlet pipeline. This pipeline enters the reservoir in its southwest corner (225-degree position) and terminates at an inlet structure at the base of the side slope. Water exits the reservoir from an outlet structure located near the south corner of the reservoir (175-degree position) at the base of the side slope and into a 36-inch diameter outlet pipe. The reservoir overflow system consists of a series of fourteen 36-inch by 9-inch rectangular weir openings in the ring wall in the northwest quadrant of the reservoir (centered at 300-degree position, 7 openings each side). Water from these openings spills into the gutter surrounding the reservoir and into a catch basin at the 300-degree position, which carries it and drainage from the reservoir roof through a 24-inch diameter drain pipe to a discharge headwall at the base of the embankment. The only regular ventilation provided in the reservoir is through these overflow weirs.