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Response Ltr for City Parametrix Comments1, a`?i.~Ci ff'i 17 a"ii E`t l~tlnc', .. t~ arch 10, 2008 SubJect: Forrester Heights -Water Booster Pump Station Second Review Comments City of Yel PX Na. 247-1781-024 Dear r. Gibson: We have reviewed the civil plan review comments and recommendations provided by the December 10, 2007 letter from Parametrix. Our response to each comment is organized to correlate with those numbered comments and a copy of the original letter is attached. For your review, we have provided four (4} copies of revised plans and reports. Our responses to the comments are as follows: 1. Design the system to provide domestic service at the 60 psi nominal average residual pressure generally available throughout the City of Yelm during peak hourly demand conditions. Fire service shall meet the 20 psi residual required by DOH. Responses The system has been revised to provide a residua! pressure of 60 psi during peak hourly demand conditions and a minimum of 20 psi during fire flow conditions. 2. The plans indicate that the booster station will be located in a utility easement. The City requires fee ownership of the boaster station site. The parcel size shall extend, at a minimum, to the fence line as described in this letter. Response: The booster station is located within Tract Fp which was originally dedicated to the homeowners association. a will dedicate Tract F to the City. ti2Q0 Gfh Avenue SE, Suite 3Q9 Lacey, WA 9S5f13 (SGCP} 24,%-72SCJ Faa (3G0} 29F-~°2v 1 SeaMfe Evereft TBCermB Lacey Forttand Eugene San FfaRGfSGO Sacramenfa Lis Angeles Pasadarra twine San Qiaga Phoettdx De r r. Jim Gibson March 10, 2008 Page 2 of 6 Response: The piping layout has been revised to allow adequate operator access far maintenance within the building. 4. Provide a 6-foot chain link fence around the entire booster station. Locate the fence a minimum of 5 feet from the building footprint and generator pad. Provide a 12-foot double-leaf gate centered on the driveway at the front of the building and athree-foot man gate at the back. Response: A six-foot chain-link fence has been provided around the generator pad; as previously discussed. S. Sheet 011.0 shows 6-inch piping connecting to the 8-inch pump skid manifold. Provide inlet and outlet piping to match the manifold. The only pipe size transitions shall be at the connections to the existing 10-inch water main stubs. Response: Connecting piping from the existing stubs has been updated to 8-inches to be consistent with manifold pipe size. The only pipe size transition is the 1Q"x8" reducers at the end of the stubbed piping. f. Revise the line types used for the in-building piping on Sheet 011.1. Drawings show dashed lines far above-slab piping and the pressure tank. Response: Line types have been revised on Sheet 021.1. 7. Provide flanged connections on all above-slab piping in the building. Provide mechanical joint fittings with thrust blocks and megalugs for all below-ground piping. Specifically, indicate the fitting and joint restraint types in the Equipment List on Sheet 011.0. Response: Ali above-slab piping in the building is connected via flanged Connections and all below-ground piping is mechanical joint fittings with thrust blocks and megalugs. Fittings and joint restraints are now dear/y catied out on sheet C21.Q Plumbing Notes. 8. Provide a check valve on the discharge side of each pump. The appropriate type of check valve should be determined based on the water hammer analysis noted below. Response: The cheek valves located on the discharge side of each pump have been tailed out on the plans and in the report. Wafer style silent check valves are specified for this project to greatly reduce the risk of water hammer. More detailed product specifications are included in Appendix B of the project report. 9. Provide a ball valve curb step at the tee for the hose bib. Response: A ball valve has been provided at the tee far the hose bib. 1 Provide a hose rack on the wall in the vicinity of the hose bib. r, Jim Gibson arch 10, 2008 Page 3 of 6 Response: A wall mounted hose rack has been provided in the vicinity of the hose bib. ~.~,. Slope the floor slab of the booster station building such that all areas will drain toward the doors, Response: The floor stab of the booster station is slaped toward the door at a slope of one-percent to provide positive drainage. 12. Provide a lifting strategy for removal of large equipment such as the pumps and bladder tank. Response: The removal of equipment such as pu ps and bladder tanks wilt be accommodated for by the double carriage doors that will provide direct access to the equipment by a large vehicle. 1 Provide an air gap for the drain line from the pressure relief valve per DOH standards. Response: The pressure relief valve is designed per DOH standards with an air gap called out on the plans on sheet G11.2. 1 The plans and project report indicate a 3S k generator will be provided, while the equipment specifications indicate 40 k. Once all comments that could impact power requirements have been addressed, provide load calculations to size the generator. Response: The generator has been resized based on the new pump sizes and updated equipment specifications to e a minimum of 55 KW. A 6QKW Detroit Diesel Generator has been specified in Appendix B. Load calculations based an the final equipment selection will be provided by the electrical contractor prior to canstruction. 15. Draw the generator to scale in the plan view, including the enclosure. Provide a minimum of 3 feet of clearance from the building to allow maintenance and fueling of the generator. Provide a detail of the generator mounting slab. Response: The generator has been drawn to scale in the plan view with 3 feet of clearance from the building. A detail of the generator mounting slab has also been provided on Sheet G21.1. 16. Provide the optional foam and sound scoop noise attenuation options on the generator. Response: Optional foam and sound scoop noise attenuation options for the generator are now specified on the plans. 1?. Provide HVAC calculations to verify the exhaust fan and heater selection. Verify that the 24inch-diameter gable vents will allow adequate airflow to enter the building. Response: The exhaust fan has been increased from 50 cfm to 100 cfm capacity. Galculations justifyfng the size of the exhaust fan and heater selection have r. Jim Gibson arch 10, 2QC18 Page 4 of 6 been added to the project report. The combination of continuous ridge venting, continuous soffit venting and ~4-inch diameter gable vents meets lBG standards for ventilation. 18. Provide calculations {not estimates} of the fitting losses and head losses through the boaster station to verify pump selection is correct. Include the losses through the check valves requested in this letter. Response: The calculations for fittings -osses are Included in the revised project report. 19. Perform a water hammer analysis on the booster station and proposed Forrester Heights° water distribution system. The analysis should specifically address fire hydrant and system valve operation, normal pump starts and stops, and pump stops due to power outage. Response: Through discussion with Parametrix it has been concluded that they wi-1 perform a water hammer analysis upon submittal of the revised plans and report. 2Q. Provide bladder tank sizing calculations. Pravide two smaller bladder tanks for redundancy. Response: A 132 gallon, ASME certified bladder tank is specified for this project. 21. As previously requested, provide a detailed control and instrumentation plan and control logic. Describe the specific instrumentation and control components proposed for use in the system. Provide variable frequency drives {VFDs) for all pumps. In the control logic, include the capability to periodically alternate which pump serves as lead for providing domestic flows. Response: Amore detailed control and instrumentation plan and control logic has been added to the report to more clearly describe how the system components will function. Variable frequency drives wi11 control atl pumps for calculated domestic and fire flow conditions. 22. The puns indicate that the electrical systems will be bidder-designed. As previously noted, a detailed electrical design must a provided to review adequacy of the system prior to approval of this project. r. Jiro Gibson March 10, 2008 Page 5 of 6 Response: The electrical system will be bidder designed, but a more detailed design has been provided on the plans and in the project report in order to allow for review Of system adequacy at this stage. 23. The electrical system will require review once the mechanical comments have been addressed. General electrical comments are: o Clarify the type of enclosures to be used far the control panel and transfer switch. * Provide minimum of 3 feet of clearance in front of the contra) panel and transfer switch. Provide weatherproof receptacles inside the booster station. Response: The plan has been revised to address the general electrical requirements noted. Response: A remote terminal unit for the connection of the booster station to the 25. The maintenance chart included in the protect report includes references to a well, well house, and reservoir. Provide aprotect-specific maintenance chart. Response: The maintenance chart in the project report has been revised to be more project-specific. 26. The City will require a double check valve backflow assembly (DCVA) on each water service served by the boaster station to prevent draining of residential plumbing in the event of a water main break. Response: A double check valve backflow assembly has been specified for all water services served by the booster station on sheet C11A. r. Jim Gibson March 10, 200$ Page 6 of 6 27, Provide all D0H comments provided in response to the Project Approval Application Form with the next submittal package, Response: Comments from DOH are included with the subm/tta/ package. We have also Included a separate response letter to you addressing the DOH comments specifkatly. 28. Installation of a meter on the discharge side of the booster station was considered, but was determined to be unnecessary due to the small area and limited number of residence served by the station. However, the City will generally require a meter installed in accordance with City Standards on future water booster stations. Response: Comment noted We appreciate your timely review to these revised plans so that this project can be completed as soon as possible. Thank you, and please give me or Clint Pierpoint a call, if there are any questions. Sincerely, ~' Ben Enfield Design Engineer BEE:h 406450.10 az3a v. n~°~r,,-z ra. $c~x~e~a S~r~ t^R,4~'ASH[~GTt3N'3£~,3~?-i5~t, T. 2."~3. 8f+3 0 512 F. 253 . Rta3 . t~?46 x*.-ss~.~arametri~.cntn December 14, 2447 PMT No, 2~7- l7~ l -42d lvtr..liz~~ Gibson, P.E_ Ci~.r of ~'el,m 1.45 ~ ehn Avenue West ~`~elzn, ~'~IA 9597 Re: Forester Heights Watea- Booster Pump Station, Second Revic;~v C'oz~~z~~ez~ts Dear ~tlr. Gibson: n November 2l , 2t)47, eve provided coz~~n~ents and recott~zt~endatioa~s based on review ofthe desiml submittal by FF for the Forrester Heights Booster Pzzmp Station received in our office November 5, 2447_ Th.e submittal included a revised Water Booster Pump Station dated E~ctober `?'', 2447 (Engineer's Seal Date~~ full size desi~za drawings dated Qctober 22, 2447 (Engineer's Seal Date), and a Washington State Department of Health Project Approval App4cation Form (undated. After meeting with City of ~ elna staff on December 4, `2447, we are providing the following comments, wlaicl~ incorporate our previous review as well as City staff cozrzments to be addressed laraor to approval of the booster statiotz plans: 1. Design the system to provide domestic service at the C~4 psi noz~7inal average residual pressure generally available throughout floe City of ~ elm during peak hourly demand conditions_ Fire service shall meet the 20 psi residual required by DQH. 2. The plans indicate that the booster station will be located in a utility easement. Tl~e City requires fee ownership of the booster station site. The parcel size shall extend, at a mizumum, to the fence line as described in this letter. 3. Revise the building andF`or piping layout to allow adequate operator access to the pump skid, sert%ice panel, and control panel. In the current conli4~z.~ration, an operator would have to step over above-slab piping, including a pressure release valve and hose bib, to access the panels. Provide a minimum of 2 feet cif clearance on all sides of the pump skid. Please note that some of the cuznnzents and. r°econ3n~endatiotzs in this letter will change the dimensions of the proposed equipment. ~. Provide a b-foot chain link fence around the entire booster station, Locate the fence a minimum of 5 feet frota~ the builduzg footprint and generator pad. Provide a l2-foot double-leaf gate centered on the driveway at the front ofthe building and a ~-foot man gate at the back. 5. Sheet CI l.4 shows 6-inch piping connecting to the ~-mach pump skid manifold. Provide inlet and outlet piping to match floe manifold. The only pipe size transitions shall he at the connections to the existing l4-inch water main shzbs_ ~Ir_ Ji.tn Gibson Decettiber 10, 2007 Page 2 ~. Revise the line types used far the in-building piping an Sheet C'1 L 1. Drawings Shaw dashed lutes for agave-slala Piping and the pressure tank. 7A Provide flanged eonnecti.ans on all above-slab piping in the building. Provide mechanical joint fittings with flu-ust blacks and megalu~s far all below-ground piping. Specifically indicate the ftting attd joint restraint types in the Equipment List an Sheet C l l .~. S. Fravide a check valve on the discharge side of each putt~p. 'l'ife appropriate nfpe of check valve sitauld be dete~ined based on flee water hammer analysis noted below. ~. Fravide a ball valve curb stag at the tee far the Rase bib. l.d. Fravide a base rack on the wall its the vicinity of tire. base bib. I ] . Slope the Haar slab of the boaster station building such that all areas will dt•ain toward the dears. 12. Fravide a. lifting strafie~y far removal of lot°ge equipment such as the- pumps and bladder tank. I3. provide att. air gap far the drain line from the pressure relief valve per .D+~H standards. I4. The plans and project report u~dieate a ~S kW generator will lie provided, while the equipment specifications indicate 40 k~. Qnce all cotntttents tlza.t could impact power requirements stave been addressed, provide load calculations to size tl~e getteratar. I~. Draw the generator to scale in the plan view, including the enclosure. Provide a minimum of 3 feet of clearance from the building to allow maintenance and ~l~eling of the generator. Fravide a detail of the generator mounting slag. IC, Fravide the optional foam and sound scoop noise attent~tian options an the ~etleratar. 1.7. Provide H~AC' calculations to verify the exhaust fan and. heater selection., Verif}= tizat t11e 2~-inch-diameter ;;able vents ufill allow adequate airflow to eater the building. I~. Ft-avide calculations {not estimates) of the fitting losses and lead losses tltraugh the boaster station to vet-ify pump selection is eats-ect. Include the lasses through the cheek valves requested in dais letter. l q. Perform a water hatnt~ter analysis on the booster station and proposed Forrester Heights water distributiatl system. The analysis should specifically address ire hydrant attd system valve operation, normal pump starts and stops, at~d pump stops due to paw•er outage. 2t). Fravide bladder tank sizing calctt.latiarts. Fravide two stt~aller bladder tanks fat- redundancy, 21. As previously requested, provide a det*~iled control and instrumentation plan and control logic. Describe floe specific instruntetttation and control coti~panettts proposed for use in the system. Provide variable frequency drives (VFDs) far all ptn~nps. In floe central logic, include the capability to periodically alternate which pump serves as lead far providing daniestic flows. ~2, The glans zndicare char. the etecrrccat systertts win be t~idcter-designed, ~s previously Hated, a detailed electrical design must be provided to review adequacy of the system prior to approval of this project. Mz•. Ji~aa Gibsoza Decezrzber 10, 2007 Page ~~ 23, Tize electrical systez~z will require review o~ace thy; zaaeclaanical comzzaents have been addressed. Gezaeral electrical comments are: • Clarify the type of enclosures to Lae used for the contz~ol panel azzd transfei switch. • Provide a minimuzaa of 3 feet ofclearance in front of Ilse control panel and transfer switch. • Provide weatherpz-oof receptacles inside tlae Iaooster station. 24. The developer shall provide the equipz~aent necessaz-y to facilitate connection of tine booster station to the City's SCADA system. Specitically4 provide a new Remote Terminal Linn ~RTU) built by Taurus Controls based on a Rockwell Micrologix 100 similar to the mater System Weli House unit. Provide an InputfC}utput ~I!©) list for the control of new Iaooster pumps, monitoring of tine .pressure instrumezat, monitoring of the eznecgency generator, and an intrz~sion door switch to Taurus Controls to allocu faze systezaa to be customized to tbi~~ecific ~.lala'~cation. °~,^,te: that dais projc:,t wilt require coordination between the electrical design and Taurus Controls including izlstruments, Iaooster pomp cozatrols, and other features_ The I~`{~ list provides a major part of this coordination link. A Parametrix teehnieian gill verify that the City's radio SCADA system has coverage at the Iaooster sta~tio~a site. 25, Tlae zaaaintenance chart includcd iza Ilse laroject report incluctcs references to a well, well house, and reservoir. Provide aproject-specific naaizatenance ciaaz-t. 2~. The City will require a double check valve baekflow assembly ~DCVA) on each water service served by the booster station to prevent draining of residential plumbing in the event of a water main Break. 2 7. Provide all DC?H comments provided in respozzse to Ilse Project Approval Aplalication. Fonaa with tlae next submittal package, ?~. Installation of a meter on the discharge side of the booster station eras considered, but eras determined to be zznnecessary due to the small area and limited number of residences served by the station. However, the City will generally require a meter installed in accordance with City Standards oza fixture water booster stations. Qnce these conanaents have been addressed and the additional izafornaation requested lass been provided, we caaa complete our xeviekv of the proposed booster station. If we can be of further assistance, please let us kzaow. Thank ~,rou for ties ~Fez-yF tzazly youz-s. P RAM TRIX ~ ' ,. Ran y R ynozad, P.E, Senior l~,n~ineer, Mun.ici.pal Services group RR:nkd Michael T. Ollivant,.P;~-~~~~~~ eater Sohztions Program Manager you. ec: Project File