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Home My WebLink AboutSite Certifications - 06/26/2014NORTHERN ENGINEERING Final Drainage Certification Letter Date: June 23, 2014 Project: CSU Engines & Energy Conversion Lab (EECL) Fort Collins. Colorado Permit No. B1205671 Attn: Dan Mogen City of Fort Collins — Stormwater Utility 700 Wood Street Fort Collins, Colorado 80521 Dear Dan: NE Project Nos. 207-007/8 TNC Project No. 2627A e �ZGFA eSC r�`^� Cfs wn �31I�^. re.�Jdo�Q�t f This letter serves as final documentation for overall site grading and drainage improvements for the CSU Engines & Energy Conversion Lab (EECL), also known as the CSU Powerhouse Energy Campus. An initial site walkthrough and punch list was created in January of 2014, which along with the posting of an escrow, allowed for the release of a Temporary Certificate of Occupancy (TCO). Since that time, the initial punch list items have been addressed. A follow-up walkthrough with City Staff was held on 04.16.14. While the majority of the open items were found to be complete and satisfactory, a few new items were observed that required further correction. All items have now been resolved. Below are lists of items from both walkthroughs. The closeout status is noted below each item in red italics. January 2014 Punch List Items and Final Status Updates: N Water Quality Swale between building and N. College Ave. Complete with final landscaping. Note additional corrections below from April site walk. N Fine Grading and Soil Preparation for all parking lot islands and perimeter curbs Complete with final landscaping. N Fine Grading and Soil Preparation for disturbed areas south of Poudre River Trail Complete with final landscaping. N Bio-Retention Water Quality Pond Touchup N address standing water/ice N remove rock pile and other miscellaneous material N smooth ruts, fine grade, soil prep N general cleanup Complete with final landscaping (all of the above). 301 N. Howes Street, Suite 100, Fort Collins, CO 80521 I 970.221.4158 I www.northernengineering.com NORTHERN ENGINEERINGCSU EECL Expansion I Final Drainage Certification 1 06.23.14 April 2014 Punch List Items and Final Status Updates: N Sod at curb cut from parking lot into Grass Swale BMP needs to be flush with flowline. The sod has been lowered (see photo below). N Existing sidewalk culvert pipe needs to be exposed and cleared at downstream end. The culvert outlet has been exposed (see photo below). N Grass Swale BMP needs to be regraded to remove "belly" from thalweg. The swale grading has been corrected (see Record Drawings). Sod at Curb Cut I Parking Lot into Grass Swale An as -constructed stage -storage volume computation was conducted utilizing survey information gathered by Northern Engineering. A copy of the constructed pond volume calculations is attached to this letter. Post -Construction survey information was also utilized to prepare Record Drawings of the Grading Plan and Storm Sewer Profiles. These plan sheets are attached to this letter as well. Page 2 of 3 .V NORNHERN CSU EECL Expansion I Final Drainage Certification 1 06.23.14 Exposed Pipe Outlet I Sidewalk Culvert at Historic Lawn The drainage facilities for the above -referenced project are now 100% complete. The improvements are in substantial conformance with the City approved Grading and Drainage Plans for this property. This Final Drainage Certification should allow for the issuance of a Final Certificate of Occupancy, as well as the release of any associated escrows. Please feel free to contact me if you have any questions. Sincerely, Nicholas W. Haws, PE, LEED AP cc: Sergio Ortiz - The Neenan Company Travis Huppen - The Neenan Company enc. Page 3 of 3 ■� NORTHERN ENGINEERING Project Title Engines & Energy Conversion Lab Date: June 23, 2014 Project Number 207-007 Calcs By: C. Snowdon Client CSUBF Pond Designation Pond B -As-Built Pond Volume fi 00 -i 0.0283 ac-ft 0.170.1700 ac-ft 0.1983 ac-ft A.*A- D = Depth between contours (ft.) Ar = Surface Area lower contour (ft') A, = Surface Area upper contour (ft) (ft) Area (IF) I Depth (ft) IF 4969.00 254 47 0.00 0,00 0.00 4969.20 883.77 0.20 107.50 107.50 0.0025 495910 1618.43 0.20 246.54 354.04 0.0081 4969.60 2419.71 0.20 401.14 755.18 0.0173 4969.80 3406.22 0.20 579.79 1334.97 I -_ 4970,00 4958.37 0.20 831.62 2166.58 0.0 997 4970.20 6846.88 0.20 1175.46 3342.04 0,0767 4970 40 8893.69 0.20 1569.60 4911.64 0.1129 4970.60 11041.77 0.20 1989.68 6901.32 0.1584 997"0 13304.95 0.20 2431.16 9332.48 � _ ' 3�t/Il 15308.23 0.20 2858.98 12191.46 0.2799 Elevation DePWL-_.- wDCv -. -.c. 0.76 0.0283 100-yr 0etention 1970.64 1.64 0.1700 Overall Detention 4970.74 1.74 0.1963 301 N. Howes Street, Suite 100, fort Collins, CO 80521 970.221.4158 www.northernengineering.com III/` ,112I/ Ir 91i1 6� 4i m � V qqcpp. }}y�aa s P�P Q gg 13 A�a ii°lF,�ap a s� gg i61' �p �^ Ola Engines Energy conversion labora[os•I ' N ._..T_ N 1 • 1 e er NORTHER SRuN Colorado State Un Wuri ENGINEERING A, dd Sr � of g!1!n!5 ulviE4 ppa R/vlR _ ti Oi � M � u7 N$ HIP hFh'd �� rlelal ��: h„i a l ERIFPII g, gg pp2d 101 p 7 "iF � a Ili �$l��b wm.Ea¢RRexEmw.vm t 7 sa 19 I ey �MF4ngyRE-R ��Cry e•! a $ � x� � � � � 3 £ 3d Puke •y a rdei R a i 12 INN av x�,s e�a i.i�q4 L -Q riele3 c i m a e9 i i°ih6q�pjyu, h.;xi.q €gvile � li 1i1E 1 ��s=R a a 97e}D%w 'i q5fig�gIde�.dl@�gq-l-aaN,:r�Z �d ,q qiiq a �"""��r'''��'xiyj �€3 �5'�`•Idx3Sda l u I 11 t1 hiNS �iNYlb- 2E 7 Z v Q f! • SAA,9GC Engines & Energy Converslon LaboratoryNORTHERN 1 c PLAN AND AND raOFlLE Caloratlo State unNerslty _ •.�.. ••.. •.• E N G I N E E R I N G ucntnnrclwm NORTHERN ENGINEERING ADDRESS: PHONE:970.221.4158 WEBSITE: 20D S. College Ave. Suite 10 www.northernenorteedng.com Fort Collins, CO80524 FAX:970.221.4159 Temporary Certificate of Occupancy (TCO) Punch List Date: January 20, 2014 Project: CSU Engines & Energy Conversion Lab (EECL) NE Project Nos. 207-007/8 Fort Collins, Colorado TNC Project No.2627A Permit No. 131205671 Attn: Mr. Glen Schlueter City of Fort Collins — Stormwater Utility 700 Wood Street Fort Collins, Colorado 80521 Dear Glen: This memorandum serves as a follow-up to our site meeting on 01.16.14. As discussed on -site, numerous fine grading items related to final landscaping installation and touchup were yet to be completed. As such, a punch list and escrow will be provided at this time so as to allow the immediate release of the TCO. The following is a list of said drainage related items to be complete with final landscaping. w Water Quality Swale between building and N. College Ave. w Fine Grading and Soil Preparation for all parking lot islands and perimeter curbs Fine Grading and Soil Preparation for disturbed areas south of Poudre River Trail r+ Bio-Retention Water Quality Pond Touchup N@ address standing water/ice m remove rock pile and other miscellaneous material smooth ruts, fine grade, soil prep general cleanup The above referenced items are all part of the fine grading and soil preparation to be performed by the landscape subcontractor. The security for said tasks is already covered under the overall landscaping escrow held by Zoning. A letter distinguishing this portion of landscape work has been attached for your reference. The dual-purpose nature of the landscape grading / cleanup will satisfy the final requirements of both Zoning and Stormwater. Therefore, a separate drainage escrow is not necessary. It should be pointed out that mass grading (pond volume), outlet structure, storm sewers, and related drainage facilities are complete and in substantial conformance with the approved plans. Hard and/or electronic versions of the applicable Record Drawing sheets can be provided, should you desire your own copies beyond those supplied to Engineering. ■� NORTHERN ENGINEERINGCSU EECL Expansion ( TCO Punch List 1 01.20.14 At your request, the Water Quality Swale and Bio-Retention Water Quality Pond will be field surveyed after final fine grading and soil prep by the landscape installer. This information will be supplied with the Final Site Drainage Certification, the acceptance of which will release both the final Certificate of Occupancy, as well as the related escrow amount. While the punch list items discussed herein certainly need to be addressed with the final landscape work, none of them pose an immediate risk to public health, safety, or welfare. This is particularly true given the current winter season, which typically does not produce major rainfall events. The primary storm drainage conveyance and attenuation network is substantially complete. Furthermore, the escrow supplied by the General Contractor will provide the necessary guarantee for these items, and allows them to be complete at a more appropriate time by the appropriate subcontractor. Please feel free to contact me if you have any questions. Sincerely, Nicholas W. Haws, PE, LEED AP cc: Sergio Ortiz — The Neenan Company Travis Huppert — The Neenan Company enc. D ^iProjects1207-0071DraimgelDrrgCentDm imgePmchList_2014-01.20.doa Page 2 of 2 ' Bath Inc. Phone 970-488-1707 2000 East Prospect Rd. Fort Collins, Colorado 80525 Fax 970-484-0470 . Bath Inc. Pricing Response Date: January 20, 2014 To: Sergio Ortiz Email: sergio.orbz@neenan.com Re: Breakout cost for remaining Fine Grade and Soil Prep Energy Conversion Labs Scope: Breakout cost for remaining Fine Grade and Soil Prep. This is a portion of the $97,200.00 for the total remaining overall Landscape and Irrigation costs. Total $4,312.00 Please contact me with any questions you may have. Thank you, Kevin Laman Bath Inc. 970-488-1707 Phone 970-484-0470 Fax klaman@bathlandscape-inigation.com Daniel Mogen From: Glen Schlueter Sent: Tuesday, January 21, 2014 12:35 PM To: 'Nick Haws'; Peter Barnes Cc: Wes Lamarque; Daniel Mogen; Travis Huppert; Sergio Ortiz; Cody Snowdon Subject: RE: EECL I Permit # B1205671 I TCO Punch List Nick, Thank you for submitting the documentation on the status of the project. The standard $2,500 escrow is required when a site certification is not submitted that follows the certification check list. I know that the frozen ground presents a problem so that is why we have the escrow option. There are two escrow options; one is to submit 1.5 times the cost estimate to complete the work and the other is to submit the standard amount. In this case you have identified the field work to be completed -and shown there is already a landscaping escrow with the City for that work. The other part of the work which has not been completed is the "site grading certification" which involves surveying the site grading elevations and addressing the other items on the certification checklist. It makes sense to complete the grading certification after the frost is out of the ground so that final grading can be completed. Therefore once the $2,500 escrow is submitted to 700 Wood St. (Check to be made out to the City of Fort Collins) I will release the hold on the CO and change it to a TCO. I do need a date for the TCO to expire so please let me know your estimate on when the final grade certification can be completed. If you have question please feel free to contact me. Glen Schlueter 224-6065 From: Nick Haws[mailto:nick(alnorthernenaineering.com] Sent: Monday, January 20, 2014 4:04 PM To: Glen Schlueter Cc: Wes Lamarque; Daniel Mogen; Travis Huppert; Sergio Ortiz; Cody Snowdon Subject: EECL I Permit # B1205671 I TOO Punch List Glen, Attached is the punch list and escrow breakout that we discussed last Thursday. I believe this should allow for the release of the TCO, with the Final Drainage Certification forthcoming once all of the landscaping and fine grading is complete. Please let me know if this is not the case. Thanks, Nick Haws, PE, LEED AP Vice President NORTHERN ENGINEERING 200 South College Avenue, Suite 10 1 Fort Collins, Colorado 80524 0: 970.221.4158 ext. 5414 1 D: 970.568.5414 ( M: 970.690.0927 F: 970.221.41591 nicWnorthemeneineering com I www.northerneneineeting.com Daniel Mogen From: Glen Schlueter Sent: Thursday, April 17, 2014 3:05 PM To: 'Nick Haws' Cc: Cody Snowdon; Wes Lamarque; Daniel Mogen Subject: RE: Engines Lab Nick, Thanks for that explanation; it truly does change how I look at the underdrain system. I don't know if it is explained that way in the drainage study but it would be good to add a couple of sentences to the certification document similar to what you have written below. I think then we can close out the project as far a drainage goes. Thanks, Glen From: Nick Haws[mailto:nick@northernengineering.coml Sent: Wednesday, April 16, 2014 5:19 PM To: Glen Schlueter Cc: Cody Snowdon Subject: RE: Engines Lab Glen, Knowing that the bluegrass front lawn was of such importance to Historic Preservation, we designed this water quality feature as a "Grass Swale" using the attached recommendations from Urban Drainage. The underdrain is there primarily to reduce excessively wet areas. The water quality effectiveness is not necessarily predicated on well draining/infiltrating soils, although that certainly increases the benefit. We'll see how well it's currently infiltrating with the sod, but I don't think it is as damaging as it could be if it were intended to be a true PLD/rain garden/bioretention area. Thanks, Nick Haws, PE, LEED AP Vice President NORTHERN ENGINEERING 301 N. Howes Street, Suite 100 1 Fort Collins, Colorado 80521 0: 970.221.4158 ext. 5414 1 D: 970.568.5414 1 M: 970.690.0927 nicka,northemeneineerine.com I www.nonhemenginecring.com From: Glen Schlueter [mailto:GSCHLUETERCalfcgov.coml Sent: Wednesday, April 16, 2014 5:00 PM To: Karen McWilliams Cc: Nick Haws; Cody Snowdon Subject: Engines Lab Karen, We had a second site certification visit today at the engines lab. I was informed that you had required the front area to be sodded with blue grass. There is a water quality feature in the grass area that needs to allow water to infiltrate runoff into the underdrain. Part of the sod is clay soil. Clay in sod has been known to seal off water penetration so I was wondering if you would be OK if part of that front area is seeded (over the water quality feature). If not it might not work. As long as the roots are planted in the existing clay it seems to work with aeration. 1 Daniel Mogen From: Glen Schlueter Sent: Friday, April 18, 2014 2:22 PM To: Wes Lamarque; Daniel Mogen Subject: FW: Engines Lab Now we get the real story. From: Karen McWilliams Sent: Friday, April 18, 2014 2:06 PM To: Glen Schlueter; Josh Weinberg Cc: Nick Haws; cody(dnorthernengineering.com Subject: RE: Engines Lab Hi, Glen, et al — Sounds fine. The Commission's concern was that the front was historically a lawn, and they wanted to retain that characteristic. I don't think we specified the type of grass, other than that the results appear "lawn -like." - Karen From: Glen Schlueter Sent: Wednesday, April 16, 2014 5:00 PM To: Karen McWilliams Cc: Nick Haws; codyCabnorthernengineering.com Subject: Engines Lab Karen, We had a second site certification visit today at the engines lab. I was informed that you had required the front area to be sodded with blue grass. There is a water quality feature in the grass area that needs to allow water to infiltrate runoff into the underdrain. Part of the sod is clay soil. Clay in sod has been known to seal off water penetration so I was wondering if you would be OK if part of that front area is seeded (over the water quality feature). If not it might not work. As long as the roots are planted in the existing clay it seems to work with aeration. They are watering it now to see if the sod is allowing the water to penetrate and if it does then we will not need to continue this conversation. Just trying to be proactive, Glen