Tank_Replacement_SOW_100305.pdf

FOREST-WIDE WATER TANK REPLACEMENTS (CIM-0305-69F)

STATEMENT of WORK

Coronado National Forest March 5, 2010 dmollet@fs.fed.us and bpayne@fs.fed.us

PURPOSE OF PROJECT

The Coronado National Forest encompasses the Sky Islands of Southeastern Arizona; it manages public use of these lands. Due to the remoteness of these areas water storage tanks have been placed throughout the forest to supply potable water to both visitors and forest service administrative sites.

Built mainly in the 1950s and 1960s, the forest water systems and associated water tanks have been expanded and improved over the years. However, a few of the existing water tanks are nearing the end of their service life. At over 40 years of age, many of these tanks are in need of repair and replacement to comply with environmental regulations and to continue to serve forest visitors and personnel effectively.

PLANNED WORK

Given the overall poor condition of the water tanks, five (5) of the existing tanks will be removed and replaced with new facilities; one tank will be reinstalled at another location for non-potable water use. The current design includes the purchase 6 new glass-fused-to-steel tanks that range in size from 10,000 gallons to 35,000 gallons. The work will also include preparation of a compacted pad adjacent to or on top of the existing water tank pad at each location. All new facilities will comply with state regulations, including the restrictions and requirements of the Arizona Department of Environmental Quality.

The requirement for and selection of glass-fused-to-steel tank material is based on the historical record of poor tank maintenance on the Coronado National Forest, and the entire U.S. Forest Service, which has resulted in water quality violations and compromised tank life due to tank rust-through. The selected tank material performs without recoating for several multiples of conventional tank life and therefore yields a lower life cycle cost than conventional tank materials and maintenance methods. The selected tank material is essentially maintenance-free.

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DESCRIPTION OF WORK BY SITE

Palisades Water Tank

The tank and water system that serves the Palisades Administrative Site (Palisades AS) and other downstream users is located due north of the Palisades AS in the Santa Catalina Mountains on the Santa Catalina Ranger District in Pima County at Township 12 South, Range 16 East, Section 9. The tank is located adjacent to the Catalina Highway.

Existing 35,000-gallon Palisades Tank – Remove & Replace in-situ

EXISTING TANK: 35,000-gallon, bolted steel

EXISTING TANK PAD: 25 feet in diameter (exactly matches tank bottom)

TANK REMOVAL: Existing tank is to be unbolted or otherwise cut/disassembled and hauled to an acceptable disposal facility; tank has lead-based paint applied

PROPOSED TANK: Minimum 35,000-gallon, glass-fused-to-steel bolted tank, bottom fill at sidewall with internal fill standpipe

PROPOSED TANK ACCESSORIES (see specs for complete list): standard overflow and drain, access ladder and manholes, level indicator, inflow meter, brass or stainless steel ball valve and concrete valve box with steel lid at inlet and outlet, two (2) brass or steel NSF-certified shut-off floats and valves

PROPOSED TANK PAD: Re-use existing tank pad, expanding to 30 feet in diameter – balance cut-fill; install open-graded sand pad within a new steel ring

Showers Point Water Tank

The Showers Point Campground sits atop the Santa Catalina Mountains on the Santa Catalina Ranger District in Pima County at Township 12 South, Range 16 East, Section 8.

Access to the campground itself is excellent, with an entry road directly off of the Catalina Highway. Access to the Showers Point tank is moderate for a flatbead truck traveling overland, along a 6-foot wide footpath that leads to the tank.

Existing 10,000-gallon Shower Point Tank – Remove & Replace in-situ

EXISTING TANK: 10,000-gallon, bolted steel

EXISTING TANK PAD: 14 feet in diameter (exactly matches tank bottom)

TANK REMOVAL: Existing tank is to be unbolted or otherwise cut/disassembled and hauled to an acceptable disposal facility; tank may have lead-based paint applied

PROPOSED TANK: Minimum 10,000-gallon, glass-fused-to-steel bolted tank, bottom fill at sidewall with internal fill standpipe

PROPOSED TANK ACCESSORIES (see specs for complete list): standard overflow and drain, access ladder and manholes, level indicator, inflow meter, brass or stainless steel ball valves and concrete valve boxes with steel lid at inlet and outlet, brass or steel NSF-certified shut-off float and valve balance cut-fill; install open-graded sand pad within a steel ring

Rose Canyon Water Tank

The Rose Canyon Campground sits atop the Santa Catalina Mountains on the Santa Catalina Ranger District in Pima County at Township 12 South, Range 16 East, Section 10.

Access to the campground itself is excellent, with an entry road directly off of the Catalina Highway. Access to the Rose Tank is on a 4-wheel-drive dirt road less than ¼ mile in length that leads directly to the tank.

Existing 20,000-gallon Rose Canyon Tank 4-Wheel-Drive Access to Rose Canyon Tank Remove & Replace in-situ

EXISTING TANKS: 20,000-gallon, horizontal steel tank on skids; 2,000 gallon abandoned steel tank

EXISTING TANK PAD: 15 feet wide by 20 feet long

TANK REMOVAL: Access to tank site may need to be improved to allow Contractor’s vehicles to reach the tank; existing tank is to be cut/disassembled and hauled to an acceptable disposal facility; additional small 2,000-gallon abandoned steel tank also to be cut/disassembled and hauled to an acceptable disposal facility; tanks may have lead-based paint applied

PROPOSED TANK: Minimum 20,000-gallon, glass-fused-to-steel bolted tank, bottom fill at sidewall with internal fill standpipe

PROPOSED TANK ACCESSORIES (see specs for complete list): standard overflow and drain, access ladder and manholes, level indicator, inflow meter, brass or stainless steel ball valves and concrete valve boxes with steel lid at inlet and outlet, brass or steel NSF-certified shut-off float and valve

Spencer Canyon Water Tank

The Spencer Canyon Campground sits atop the Santa Catalina Mountains on the Santa Catalina Ranger District in Pima County at Township 12 South, Range 16 East, Sections 5 and 6. Access to the campground itself is excellent, with an entry road directly off of the Catalina Highway. The tank site is adjacent to and accessible from the campground road system.

Existing 15,000-gallon Spencer/Ponderosa Tank –

Remove and Reinstall at Nearby Location; Install New Tank

EXISTING TANK: 15,000-gallon, horizontal steel tank on skids

EXISTING TANK PAD: 10 feet wide by 15 feet long

TANK REMOVAL: Existing tank is to be moved intact to another site for use as a non-potable water tank – see attached map of Sollers Point Helibase; install relocated tank at that location (access to tank site may need to be improved to allow Contractor’s vehicles to reach the tank); tank has lead-based paint applied

PROPOSED TANK: Minimum 30,000-gallon, glass-fused-to-steel bolted tank, bottom fill at sidewall with internal fill standpipe; tank shall have 3 separate outlets and valve assemblies, with internal standpipes at heights that equally divide the tank into thirds.

The outlet pipes/valves shall be designed to prevent loss of the full volume of the tank should a break occur in the site piping downstream.

PROPOSED TANK ACCESSORIES (see specs for complete list): standard overflow and drain, access ladder and manholes, level indicator, inflow meter, brass or stainless steel ball valves and concrete valve boxes with steel lid at inlet and outlet, brass or steel NSF-certified shut-off float and valve

PROPOSED TANK PADS: Re-use existing tank pad, expanding to 30 feet in diameter –

Pena Blanca Water Tank

Pena Blanca Lake is located on the east side of the Tumacacori Mountains on the Nogales Ranger District in Santa Cruz County, at Township 23 South, Range 12 East, Section 23.

Access to the site is provided by the two-lane unpaved National Forest System Roads (NFSRs) 289 and 4200. These roads can be accessed via the two-lane unpaved State Highway 289 (Ruby Road).

Existing Tanks at Pena Blanca Lake – Remove & Replace in-situ

EXISTING TANKS: two steel tanks, approximately 10,000-gallons apiece

EXISTING TANK PAD: 20 feet by 20 feet

TANK REMOVAL: Existing tanks are to be cut/disassembled and hauled to an acceptable disposal facility; tanks may have lead-based paint applied

PROPOSED TANK: Minimum 10,000-gallon, glass-fused-to-steel bolted tank, bottom fill at sidewall with internal fill standpipe

PROPOSED TANK ACCESSORIES (see specs for complete list): standard overflow and drain, access ladder and manholes, level indicator, brass or stainless steel ball valves and concrete valve boxes with steel lid at inlet and outlet

Rigg’s Flat Water Tank

The Rigg’s Flat Recreation Area is located at Rigg’s Lake, atop the Pinaleno Mountains on the Safford Ranger District in Graham County, at Township 8 South, Range 23 East, Section 26. Access to the site is provided by the unpaved National Forest System Road (NFSR) 287, which branches off of the two-lane unpaved NFSR 803 (Swift Trail). These roads can be accessed via the two-lane paved State Route 366.

Existing Tank at Rigg’s Flat – Remove & Replace in-situ

EXISTING TANK: 20,000-gallon concrete tank

EXISTING TANK PAD: 20 feet by 20 feet

TANK REMOVAL: Access to tank site may need to be improved to allow Contractor’s vehicles to reach the tank; existing tank is to be demolished and hauled to an acceptable disposal facility of US Forest Service property

PROPOSED TANK: Minimum 20,000-gallon, glass-fused-to-steel bolted tank, bottom fill at sidewall with internal fill standpipe

PROPOSED TANK ACCESSORIES (see specs for complete list): standard overflow and drain, access ladder and manholes, level indicator, inflow meter, brass or stainless steel ball valve and concrete valve box with steel lid at inlet and outlet, brass or steel NSF-certified shut-off float and valve