This is a service / maintenance or supply contract in Baker City, Oregon. Contact the soliciting agency for additional information.

City of Baker City (COBC) is requesting proposals for labor and equipment to clean and video inspect the interior of a concrete 4.5 MG baffled chlorine contact chamber / water storage reservoir and clean and video inspect the interior of a concrete 3.0 MG water storage reservoir using divers or robotic methods. 4.5 MG Reservoir Specifications: 180 ft. outside diameter dimension. Approximate height from floor to overflow: 25 ft. Total wall height 27 ft. The tank's roof height above natural ground ranges from 4 ft. to 12ft. with stair access to the roof from the access road. The interior of the reservoir contains three (3) inner baffle walls with one opening per wall. The top of the reservoir is flat with two points of entry that are easily accessible. Both man hatches have a caged ladder extending down to the floor of the tank. The access hatch openings measure 30"x54". The reservoir construction is concrete (floor, walls and roof). There is a 1 ft. high ledge across the bottom of the opening between the 1st (outer) and 2nd chamber. There is good vehicle access around the perimeter of the tank. A nearby site (less than 300' from the reservoir) is available for disposal of water and sediment. The City has 6" lay flat hose available if needed for the conveyance of the water and sediment to the disposal site. The estimated total volume of sediment for the reservoir is approximately 160 cubic yards. Historically, the 4.5 MG reservoir was drained and cleaned with a high pressure wash down system. Most of the sediment was found in the outer chamber between the inlet and the ledge that divides the outer chamber from the 2nd (inner) chamber. The ledge was due to a footing construction error where the wall footing was mistakenly constructed across the wall opening. If needed, the water level in the tank can be drawn down to as low as 16 ft. above the floor elevation and still remain in operation, although it is preferable to maintain at least 20 feet of water in the reservoir during high-demand periods. There are two 30"x54" ladder access hatches and eight 24"x24" removable vents for suction hose access into the chambers. 3 MG Reservoir Specifications: 144 ft. outside diameter dimension with no interior walls or chambers. Approximate height from floor to water surface = 27 feet. Total wall height: Approximately 30 ft. Outside wall height above natural ground is approximately 20 ft. with good vehicle access around the perimeter of the reservoir. There is one point of access on the roof (24"x36") which is accessed from an exterior caged ladder. The reservoir construction is concrete (floor, walls and roof). The roof of the reservoir is domed with a 2 ft. m/l wide ledge around the perimeter. There are no ledges or obstructions in the floor. A nearby disposal area is available for discharge of sediment and water if cleaning is required. The estimated total volume of sediment for the reservoir is unknown. Historically this reservoir (tank) has had very little sediment as the bulk of the sediment is trapped in the upstream 4.5 MG reservoir. The access hatch is approximately 24" x 36" and is located near the edge of the tank. Scope of Work and Special Provisions: The price quoted shall include the following: 1. All mobilization, equipment, and labor required to video inspect the 4.5 MG and 3.0 MG reservoirs using divers or robotic methods. 2. All mobilization, equipment, and labor required to clean up to 160 cubic yards of sediment from the floor of the 4.5 MG reservoir (equivalent to an average sediment depth of 2" across the entire reservoir) using divers or robotic methods. 3. Color video inspection with still photos of problem areas within the reservoir. 4. Written report of inspection results. 5. Underwater divers shall use a full body dry suit with hardhat scuba and external air supply. All equipment and Diver(s) utilized on the project shall be disinfected by spraying 200 mg/l solution of chlorine on all surfaces that will come into contact with drinking water. 6. Cleaning equipment and hoses that will come in contact with potable water shall be dedicated for use on potable water projects only. The Contractor shall not place any equipment in the municipal reservoir that has been previously used in a non-potable application. 7. The cleaning crew will make every effort to coordinate work with the Water Treatment Plant operations. 8. The depth of sediment in the 4.5 MG reservoir shall be physically measured and an average sediment depth determined for each chamber. The number of sediment measurements taken by the Contractor shall be as directed by COBC, and the average sediment depth determined for each chamber shall be as agreed upon between the Contractor and COBC. The average depths determined by field measurement shall be used to determine total sediment volume for the purpose of calculating final payment. 9. The contractor performing the work will be required to read and sign the COBC contractor safety form. 10. All travel and per diem costs shall be incorporated into the quoted base price. Separate payment will not be made for travel and per diem costs. Alternative Scope of Work: The price quoted for item noted as "alternative" work shall include the following: 1. All equipment and labor required to clean sediment from the 4.5 MG reservoir in excess of the 160 cubic yards included in the base rate. Excess sediment removal shall be measured and paid in 10 cubic yard increments. 2. All equipment and labor required to clean up to 10 cubic yards of sediment from the floor of the 3.0 MG reservoir (if cleaning is found to be necessary at the time of reservoir inspection). Note: The alternative item noted above is intended to establish unit cost for additional work that may be necessary based on conditions encountered at the time of inspection. The alternative item may or may not be incorporated into the final project. City of Baker City may direct the contractor to complete this alternative item at its sole discretion based on the conditions found in the reservoir at the time of inspection. Schedule: Work shall begin on or after July 1, 2024, with final completion occurring no later than November 1, 2024. Typical average daily flows are 6-7 MGD in the summer months and dropping to 3-4 MGD by October. Typical weather for the Baker area is for nighttime freezing temperatures starting in mid-September with continued freezing temperatures at night during October.