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Home My WebLink AboutCORRESPONDENCE - PURCHASE ORDER - 9168073FC Rolland Moore- Lake Aeration 2016 Aquatics Associates, Inc.- Prepared 11/28/16 AQUATICS ASSOCIATES, INC. 3013 E. Mulberry St. Fort Collins, CO 80524 970.493.2626 fax 970.493.3636 DATE: November 28, 2016 TO: Drew Crecca City of Fort Collins - Parks ACrecca@fcgov.com FROM: Tami L. Schneck Sr. Aquatic Biologist tami@aquaticsassociates.com SUBJECT: Scope of Work and Estimated Costs FC Cottonwood Glen Park Pond (Spring Canyon) – Aeration Equipment AERATION EQUIPMENT Costs are provided below for an aeration system for the 1.8-acre pond at the City of Fort Collins, Cottonwood Glen Park (Spring Canyon Park). A brief scope description of work and associated costs are provided below. A subsurface aeration system was designed for the Cottonwood Park Pond based on surface area, water depth, and bottom configuration. Aeration equipment will be installed to oxygenate and circulate lake waters, to oxidize suspended and bottom organic matter, and to ensure sufficiently high dissolved oxygen levels throughout the water column to improve and maintain the pond’s overall water quality. One aeration system consisting of one compressor and three diffusers will be adequate (minimum recommended size) for the 1.8-acre pond (Option A- total cost $7,380-8,600 range, NTE $8,600). As an option, costs are also provided for a slightly larger system which includes one compressor and four diffusers (Option B- total cost $8,085-9,645 range, NTE $9,645). Air will be supplied to the diffusers by one Gast 1/2-hp rocking piston compressor (230-v, 1-ph) capable of delivering ~4.3-4.5 cfm of air to the diffusers (minimum) against the discharge pressure of 10-12 psi and a maximum pressure of 30 psi. Note that this compressor is the same as installed by Aquatics Associates, Inc. (AAI) at Golden Meadows Park in October 2016 (for Matt Pflieger) and Fossil Creek Park in July 2015 (for Steve Wixson), which will allow for consistency in your maintenance. Note that Steve Wixson knows how to rebuild this model compressor. This system will mix the pond water volume every 8-12 hours (2-3 turnovers per day) using three Duraplate flexible membrane type diffusers (also same as installed at Golden Meadows and Fossil Creek Parks). The bubble size will not be greater than 1/8” diameter to provide maximum oxygen transfer. This aeration system is a low-intensity type that creates non-turbulent mixing. The three diffusers will be strategically positioned in the pond in the deepest areas (estimated maximum depth ~8’) to sufficiently oxygenate and circulate the entire water column. Diffusers will be appropriately spaced to provide the best water circulation and prevent stagnation. Compressor run-times will be controlled by 24-hour programmable time clocks to allow for 24/7 or intermittent run-times. The compressor should operate at least 12-16 hours per day and at intervals of 4-6 hours on a year-round basis. The compressor, air control valves, and fittings will be mounted inside the existing irrigation pump house in open spot in the southwest corner. The compressor will be mounted on a steel shelf. Three air lines will be installed off of the compressor, which will be housed inside one PVC conduit sleeve (4-6” sleeve) through the wall of the pump house to the pond shore. Flexible self weighted ¾” air hose (0.64 lbs./ft.) will extend from the shore to the diffusers, while CTS direct bury pipe will be used inside the PVC sleeve. FC Rolland Moore- Lake Aeration 2016 Aquatics Associates, Inc.- Prepared 11/28/16 Aquatics Associates, Inc. (AAI) will supply all aeration equipment and installation. All electrical work required (i.e., receptacles and wiring of compressors, timers, lighting) will be provided by client and coordinated by Tami Schneck. Electrical requirements for this compressor at 230-v, 1-phase is 3-5 amps with minimal load for the time clock (230-v). Electrical service to this equipment should be fed by one 20 amp circuit. Brian Garrette, the City’s electrician recently did the electrical for the Golden Meadows system, so he understands what electrical work will be needed. We will meet with him beforehand to layout location of the outlet and time clock. In addition to the electrical, the client will be responsible for 1) boring a hole in the pump house wall, 2) the PVC sleeve, 3) trenching (2’ minimum depth) from the pump house to the pond shore. AAI will warrantee aeration equipment for two years against defects in workmanship or materials. There is a one-year manufacturers warranty on the compressor and time clocks, and a five-year warranty on the diffusers (FOB manufacturer). SCHEDULE The aeration system can be installed in the spring of 2017. The installation of components inside the pump house (compressor & fittings, electrical) could be done in the Jan-Feb time frame; however, the outdoor components cannot be installed until it is warm enough in spring (usually March/April). Our installation schedule will dependent on completion of tasks outlined above that are the client’s responsibility. Work can be scheduled as soon as authorized and a Purchase Order is received. I will coordinate this work with Drew Crecca. A certificate of insurance for the current year is already on file (w/ John Stephen?) and a 2017 cert will be provided in Dec 2016/Jan 2017 when our policy renews for the coming year. Let me know if you have any questions or need additional information. FC Rolland Moore- Lake Aeration 2016 Aquatics Associates, Inc.- Prepared 11/28/16 AERATION SYSTEM COSTS Option A – one compressor and three diffusers Aeration Equipment Cost (in existing pump house) 1- 1/2 hp rocking piston compressor (115/230-v, 1-ph, 30 psi max.) 3- Duraplate flexible membrane diffusers w/ PVC ck valve compressor fittings (pressure relief valve, liquid filled pressure gage, 3-way air assembly, Vicont 400 oF brass check valve, ½” 300 psi high pressure air hose, copper & bass fittings) 900-1,000’ ¾” self-weighted air hose, 150’ 1” CTS feeder lines, compressor installation fittings & hardware pkg., misc. materials 1- Intermatic 24-hour time clock and additional trippers (230-v) Steel shelf for compressors (~72-84”x20”x30-32”- materials, fabrication, finishing, mounting hardware) Subtotal- Equipment $5,930 - $6,860 Installation- * Assemble & install all equipment (steel shelve, weighted & CTS air lines, 3 diffusers, 1 compressor & fittings; coordinate all work (electrical, sleeves, pump house specs); equipment start-up Subtotal- Installation $1,450-1,740 _____________ Estimated Cost- Aeration Equipment $7,380 - $8,600 TOTAL COST Not-To-Exceed $8,600 Option B Aeration Equipment & Installation – one compressor and four diffusers Estimated Cost- Aeration Equipment $8,085 - $9,645 TOTAL COST Not-To-Exceed $9,645 • FC Parks will be responsible for trenching and installing PVC sleeves from pump house location to pond shore, and electrical service to the equipment. FC Rolland Moore- Lake Aeration 2016 Aquatics Associates, Inc.- Prepared 11/28/16 AQUATICS ASSOCIATES, INC. 3013 E. Mulberry St. Fort Collins, CO 80524 970.493.2626 fax 970.493.3636 DATE: November 28, 2016 TO: Drew Crecca City of Fort Collins - Parks ACrecca@fcgov.com FROM: Tami L. Schneck Sr. Aquatic Biologist tami@aquaticsassociates.com SUBJECT: Scope of Work and Estimated Costs FC Rolland Moore Park Pond – Aeration Equipment AERATION EQUIPMENT Costs are provided below for an aeration system for the 2.2-acre pond at the City of Fort Collins, Rolland Moore Park. A brief scope description of work and associated costs are provided below. A subsurface aeration system was designed for the Rolland Moore Pond based on surface area, water depth, and bottom configuration. Aeration equipment will be installed to oxygenate and circulate lake waters, to oxidize suspended and bottom organic matter, and to ensure sufficiently high dissolved oxygen levels throughout the water column to improve and maintain the pond’s overall water quality. One aeration system consisting of one compressor and three diffusers will be adequate (minimum recommended size) for the 2.2-acre pond (Option A- total cost $6,320-7,350 range, NTE $7,350). As an option, costs are also provided for a slightly larger system which includes one compressor and four diffusers (Option B- total cost $7,605-8,525 range, NTE $8,525). Air will be supplied to the diffusers by one Gast 1/2-hp rocking piston compressor (230-v, 1-ph) capable of delivering ~4.3-4.5 cfm of air to the diffusers (minimum) against the discharge pressure of 10-12 psi and a maximum pressure of 30 psi. Note that this compressor is the same as installed by Aquatics Associates, Inc. (AAI) at Golden Meadows Park in October 2016 (for Matt Pflieger) and Fossil Creek Park in July 2015 (for Steve Wixson), which will allow for consistency in your maintenance. Note that Steve Wixson knows how to rebuild this model compressor. This system will mix the pond water volume every 8-12 hours (2-3 turnovers per day) using three Duraplate flexible membrane type diffusers (also same as installed at Golden Meadows and Fossil Creek Parks). The bubble size will not be greater than 1/8” diameter to provide maximum oxygen transfer. This aeration system is a low-intensity type that creates non-turbulent mixing. The three diffusers will be strategically positioned in the pond in the deepest areas (estimated maximum depths ~8-10’) to sufficiently oxygenate and circulate the entire water column. Diffusers will be appropriately spaced to provide the best water circulation and prevent stagnation. Compressor run-times will be controlled by 24-hour programmable time clocks to allow for 24/7 or intermittent run-times. The compressor should operate at least 12-16 hours per day and at intervals of 4-6 hours on a year-round basis. The compressor, air control valves, and fittings will be mounted inside the existing irrigation pump house in the northwest corner. The existing window would need to be sealed at the bottom of opening to protect the compressor and equipment from wet weather (compressor can’t get wet). The compressor will be mounted on a steel shelf. Three air lines will be installed off the compressor, which will be housed inside one PVC conduit sleeve (4-6” sleeve) through the wall of the pump house to the pond shore. Flexible self weighted ¾” air hose (0.64 lbs./ft.) will extend from the shore to the diffusers, while CTS direct bury pipe will be used inside the PVC sleeve. FC Rolland Moore- Lake Aeration 2016 Aquatics Associates, Inc.- Prepared 11/28/16 Aquatics Associates, Inc. (AAI) will supply all aeration equipment and installation. All electrical work required (i.e., receptacles and wiring of compressors, timers, lighting) will be provided by client and coordinated by Tami Schneck. Electrical requirements for this compressor at 230-v, 1-phase is 3-5 amps with minimal load for the time clock (230-v). Electrical service to this equipment should be fed by one 20 amp circuit. Brian Garrette, the City’s electrician recently did the electrical for the Golden Meadows system, so he understands what electrical work will be needed. We will meet with him beforehand to layout location of the outlet and time clock. In addition to the electrical, the client will be responsible for 1) boring a hole in the pump house wall, 2) the PVC sleeve, 3) trenching (2’ minimum depth) from the pump house to the pond shore. AAI will warrantee aeration equipment for two years against defects in workmanship or materials. There is a one-year manufacturers warranty on the compressor and time clocks, and a five-year warranty on the diffusers (FOB manufacturer). SCHEDULE The aeration system can be installed in the spring of 2017. The installation of components inside the pump house (compressor & fittings, electrical) could be done in the Jan-Feb time frame; however, the outdoor components cannot be installed until it is warm enough in spring (usually March/April). Our installation schedule will dependent on completion of tasks outlined above that are the client’s responsibility. Work can be scheduled as soon as authorized and a Purchase Order is received. I will coordinate this work with Drew Crecca. A certificate of insurance for the current year is already on file (w/ John Stephen?) and a 2017 cert will be provided in Dec 2016/Jan 2017 when our policy renews for the coming year. Let me know if you have any questions or need additional information. FC Rolland Moore- Lake Aeration 2016 Aquatics Associates, Inc.- Prepared 11/28/16 AERATION SYSTEM COSTS Option A – one compressor and three diffusers Aeration Equipment Cost (in existing pump house) 1- 1/2 hp rocking piston compressor (115/230-v, 1-ph, 30 psi max.) 3- Duraplate flexible membrane diffusers w/ PVC ck valve compressor fittings (pressure relief valve, liquid filled pressure gage, 3-way air assembly, Vicont 400 oF brass check valve, ½” 300 psi high pressure air hose, copper & bass fittings) 900-1,000’ ¾” self-weighted air hose, 150’ 1” CTS feeder lines, compressor installation fittings & hardware pkg., misc. materials 1- Intermatic 24-hour time clock and additional trippers (230-v) Steel shelf for compressors (~72-84”x20”x30-32”- materials, fabrication, finishing, mounting hardware) Subtotal- Equipment $4,870 - $5,610 Installation- * Assemble & install all equipment (steel shelve, weighted & CTS air lines, 3 diffusers, 1 compressor & fittings; coordinate all work (electrical, sleeves, pump house specs); equipment start-up Subtotal- Installation $1,450-1,740 _____________ Estimated Cost- Aeration Equipment $6,320 - $7,350 TOTAL COST Not-To-Exceed $7,350 Option B Aeration Equipment & Installation – one compressor and four diffusers Estimated Cost- Aeration Equipment $7,605 - $8,525 TOTAL COST Not-To-Exceed $8,525 • FC Parks will be responsible for trenching and installing PVC sleeves from pump house location to pond shore, and electrical service to the equipment.