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HomeMy WebLinkAbout2015-04-16 Planning Report ENCLOSURE 2 TPC3601 Thurston Avenue N,Suite 100 Anoka, MN 55303 Phone: 763.231.5840 Facsimile: 763.42 7.0520 TPC@PlanningCo.com PLANNING REPORT TO: Eric Johnson FROM: Scott Richards DATE: April 9, 2015 RE: Oak Park Heights—St. Croix Valley Wastewater Treatment Plant— Upgrades to Aeration Piping and Outfall Piping — Conditional Use Permit FILE NO: 236.02 — 15.02 BACKGROUND Kyle Colvin, of the Metropolitan Council has made application for a Conditional Use Permit (CUP) to allow for upgrades to the aeration and outfall piping at the St. Croix Valley Wastewater Treatment Plant at 6163 St. Croix Trail North. The project will consist of demolition of the existing piping and installation of new piping and related facilities for aeration and the outfall to the St Croix River. Trees will be removed as part of the outfall improvements. The property is zoned I, Industrial District. The wastewater treatment plant is a permitted use within this district. The property is also in a River Impact District which requires a CUP for significant exterior changes to the facility. Attached for reference: Exhibit 1: Aeration Piping Modifications— Construction Narrative, Timeline and Pictures Exhibit 2: Outfall Repairs— Construction Narrative, Timeline and Pictures Exhibit 3: Summary of Work Exhibit 4: Air Photo with Property Lines Exhibit 5: Title Sheet— Project Areas (GI1) Exhibit 6: Demolition Plan and Profile (CD1) Exhibit 7: Site Plan and Profile (CU1) Exhibit 8: Piping Sections—Aeration Piping Elevations (MP2) Exhibit 9: Tree Survey Exhibit 10: Tree Replacement Report— Kathy Widin, April 6, 2015 ISSUES ANALYSIS Project Description. The description of the projects and timelines for the construction is found in detail in Exhibits 1 and 2. A summary of the project is as follows: Aeration Piping: 1. Demolition and abandonment of existing above ground and below ground aeration piping and appurtenances. 2. Air pipe penetration through the roof of the existing blower building. 3. The installation of new above ground welded stainless steel aeration piping, fittings, valves and structural supports. 4. The installation of three new air flow meters and three new actuated valves including conduit, wiring and connections to the existing control system. The update to the aeration system was completed in December of 2014. Outfall Repairs: 1. Demolition of existing below ground outfall piping and appurtenances. 2. Installation of new RCP outfall piping, manhole and riprap. 3. Restoration of vegetated areas, asphalt, concrete surfaces and other areas affected by the work. 4. Conformance with requirements set forth by permitting agencies. The update to the outfall is expected to be completed by the middle of April, 2015. Comprehensive Plan. The Comprehensive Plan designates this area as industrial land use. The use of the property for a waste water treatment plant is recognized as industrial land use consistent with the maps and policies of the plan. Zoning Ordinance. The site is zoned I, Industrial District in which facilities such as the St. Croix Valley Wastewater Treatment Plant are a permitted use. The CUP is required to allow for the construction in the River Impact District. Trees/Screening. The Demolition Plan and Profile (Exhibit 6) indicates the trees that have been removed as part of the improvements to the outfall piping. Kathy Widin, the City Arborist has calculated a tree replacement requirement for the project at 96 inches which is the equivalent of 48, 2 inch caliper trees. The Metropolitan Council will be required to provide a tree replacement plan that will satisfy the requirement. 2 Lighting. City Staff has recognized that lighting at the wastewater treatment plant is not compliant with the standard for full cut off fixtures. The Metropolitan Council has agreed to do an inventory of their light fixtures and identify those that are not full cut off. The existing fixtures could be shielded to meet the requirements or replaced with higher efficiency fixtures that will be a cost savings. An inventory of the fixtures will be required with a plan for replacement or retrofit. Grading and Drainage. Any grading and drainage issues shall be addressed subject to review and approval of the City Engineer and the Middle St. Croix Watershed Management Organization. Department of Natural Resources. The Department of Natural Resources (DNR) has been notified of the request. The City has received no comment from the DNR on this project. Design Guidelines. There are no new buildings proposed as part of this project. The Design Guidelines do not apply with this application. Conditional Use Permit — River Impact District. The upgrades to the aeration systems and outfall piping at the wastewater treatment plant are subject to a CUP under the River Impact District. The Planning Commission should consider the environmental issues and impacts of the proposed project in making its recommendation. The conditional use permit criteria, found in Section 401.03.A.7 of the Zoning Ordinance, are found as follows: 1. Relationship to the specific policies and provisions of the municipal comprehensive plan. 2. The conformity with present and future land uses in the area. 3. The environmental issues and geographic area involved. 4. Whether the use will tend to or actually depreciate the area in which it is proposed. 5. The impact on character of the surrounding area. 6. The demonstrated need for such use. 7. Traffic generation by the use in relation to capabilities of streets serving the property. 8. The impact upon existing public services and facilities including parks, schools, streets, and utilities, and the City's service capacity. 9. The proposed use's conformity with all performance standards contained herein (i.e., parking, loading, noise, etc.). Due to the location of the improvements in an industrial area, and the fact that the facilities have been in place for a number of years and are now just being upgraded, City Staff recognizes no issue with the improvements outlined with this project. CONCLUSION AND RECOMMENDATION Based upon the preceding review, City staff recommends approval of the CUP for upgrades to the aeration and outfall piping at the St. Croix Valley Wastewater Treatment Plant at 6163 St. Croix Trail North in the River Impact District subject to the following conditions: 3 1. The Metropolitan Council shall be required to provide and implement a plan that will satisfy the requirement for tree replacement subject to review and approval of the City Arborist. 2. An inventory of building and site lighting shall be required with a plan for replacement or retrofit to comply with Zoning Ordinance standards. The freestanding and building lighting shall be brought into compliance with the Zoning Ordinance and subject to review and approval of City staff within one year of CUP approval. 3. Any changes to the grade or drainage associated with the project shall be subject to review and approval of the City Engineer and the Middle St. Croix Watershed Management Organization. 4. The City will not require conformance with the Design Guidelines for the project. 5. The plans are subject to review and approval of the Department of Natural Resources and any other state or federal regulating agency, if applicable. Pc: Julie Hultman 4 EXHIBIT MCES Project No. 807810- St. Croix WWTP Aeration Piping Modifications Construction Narrative 9/16/14 Contractor begins aeration system modifications by installing pipe supports on the tanks. 9/25/14 Demolition of electrical equipment which interferes with the new pipe support locations. 10/14/15 Pipe support installation is completed. 12/9/14 Access hole is installed through the roof of the Blower Building for the new aeration piping. Flashing and roofing patch is installed. 12/19/15 Installation of aeration piping is completed. Future work will include installation and testing of the actuators in the Blower Building. Once this is completed,the Aeration Piping Modifications will be operational. Before photo depicting green underground air supply piping, along with new piping supports: ■ wr Sv Fz { wwri t �, 2014/10/14 New aboveground air supply piping(south view): s4 t — 11.0" • , — -C ------- 3' < "' .,s. - "'mow"" t s New aboveground air supply piping (east view): a i 1V { , t. ,II , , 1... ito Imi'''7: Sf{ nit I 1': i l . 11 IN _ i . ,. m,. �,r .l�aeleit i .4.... — _ _ -4 4 New aboveground air supply piping (south view): `".. ..,....,.,,,� , ,a ,�, --...,. .�... 1- r" l;411 V in, ir 1141 . o- . � y, New aboveground air supply piping (west view): ww IF 1 ,IF ,,,, ir -----= ' Nt\ 1,... Mirt*Will I soft rpt,rwhim -__~ mg -,..;ii,:-..,,,,..... _ ,,V., - . - ' - . 4.11, . 3 . 02 1 1 : 03 EXHIBIT 2 Project No.807810 St. Croix WWTP Outfall Repairs Narrative of construction activities 3/2/15 Outfall work begins. Trees marked and inventoried for clearing. Installation of temporary road begins. 3/3/15 City Forester on site to observe marked trees. 3/4/15 Clearing and grubbing begins. 3/9/15 Tree debris removed from site. BMP's installed including floating silt curtain, bio-logs, and staked silt fence. Mike Isensee informed of progress, but chose not to visit site. Pipe delivered. Begin fusion of conveyance piping. 3/11/15 Core-drill MH3 and install temporary conveyance pipe into river. Extended work hours approved by Operations to expedite completion of project. BMP's were maintained. 3/12/15 Plant shut down for transfer of flow to temporary conveyance pipe. Existing rip rap removed and stockpiled for reuse. Begin construction of coffer dam. Isensee notified and makes a site visit; he recommends adding BMP's at a drainage culvert from the Marina (STA 1+40 LT). This is done. 3/13/15 Installed trench box over the discharge end of the existing outfall pipe. Continued construction of the coffer dam, but work shut down by MCES due to turbid water. Sorenson, Isensee, and Adams on site to observe construction impacts. Discussed options and installed a second floating silt curtain outside of Curtain#1. Extra bio-log installed STA 4+00 to 4+60. Other BMP's maintained. 3/14/15 Continue coffer dam construction. Work suspended by MCES when silt plume reaches 2nd silt curtain. Plant outfall shut down at 10:15. Resumed placing coffer dam and the plume was contained by BMP's. However, when the Plant outfall was resumed at 12:50, so did the plume and work was suspended by MCES. A third silt curtain was installed at the conveyance discharge. Isensee and Adams were on site to observe. BMP's were maintained. 3/16/15 Set up sediment capture area (STA 4+40)with sediment sock, staked silt fence, and hay bales around the perimeter. A sump pump was installed within the trench box. Temporary road construction continued. Johnson and Isensee were on site to deliver a stop work order to take effect the next day. BMP's were maintained. Project No.807810 St.Croix WWTP Outfall Repairs Narrative of construction activities 3/17/15 Sediment capture area is performing very well. Crew began demolition of existing pipe at the outfall and installed three new pipes. At 12:15,the Stop Work Order was officially terminated. 3/18/15 BMP's at the sediment capture area were reinforced. Contractor set up a settlement/filter tank to control silt. Crew continued with pipe demolition and replacement completing 4 joints. Crew worked on demolition of the concrete headwall and MH 1. Sorenson and Shodeen from DNR were on site at 1400. Sorenson stated the dewatering installation matches the submitted and approved Dewatering Plan. 3/19/15 Demolition of MH 1 and the Headwall continues. No pipe work today. Isensee on site 1330 to 1340. BMP's were maintained. 3/20/15 Dewatering is working well. Crew continued demolition of MH 1 and the Headwall. Continued pipe laying operation and demolished/installed 3 pipes. Clay trench dam constructed at STA 4+63. Begin stabilization rock above the trench dam, per plan. BMP's were maintained. 3/23/15 Dewatering to the filter tank and settlement area continues to work well. Contractor continued pipe installation and completed five lengths today. AET conducted compaction testing. Survey crews checked pipe grade and alignment. BMP's were maintained. 3/24/15 Dewatering method is working well. Removal and installation of 36" RCP pipe continues with 5 sections installed today. AET took density tests,all passed. Crew is checking in to survey hubs for grade and alignment. BMP's were maintained and more bio-logs were added to the disturbed area above the river. 3/25/15 Dewatering method is working well. Removal/installation of outfall pipe continued with 3 lengths placed today. AET took density tests,all passed. BMP's were maintained. Isensee was on site to inspect and said everything looked good. 3/26/15 Dewatering method is working well. Demo/installation of 6 lengths of RCP continued today. BMP's were maintained. 3/27/15 Dewatering is working well. Demo/installation of 1 length of RCP pipe today. BMP's maintained. Installed poly cover over disturbed soil out to coffer dam due to predicted rain. Tree survey conducted on MCES property. Property line was surveyed. Project No. 807810 St. Croix WWTP Outfall Repairs Narrative of construction activities St. Croix Wastewater Treatment Facility MCES Project Number 807810 Shank Mechanical Project Number 1266 Lametti &Sons, Inc. Project Number 14300 Lametti &Sons, Inc. 14 Day Look Ahead- Updated: March 27, 2015 This narrative will provide a look ahead of what work is anticipated to take place for the next 14 days*. *The work may be completed utilizing multiple crews working in multiple areas of the project. *Work may be completed during daytime hours and/or night time hours as approved. *The work is subject to change without notification. *Our work is weather dependent including but not limited to; precipitation,wind, lightning, frost, snow, high water, excessive heat, cold or other hazards that may provide for unsafe work conditions. Anticipated Progress: 1. Pipe and MH 2 installation will be completed. 2. Big Bag Cofferdam will start.Approximately Tuesday, 3-31-15. It is anticipated the install duration is 4 days. 3. Water will be pumped out of the Big Bag Cofferdam and cleaned through the filter box system. 4.Trench box and soil will be removed from the river. 5. River bottom material will be installed. 6. Rip Rap will be placed. 7. Big Bag Cofferdam will be removed. 8. By-Pass will be removed. 9. Site will be de-mobilized. 10. Site will be either temporarily seeded or permanent seed installed depending on weather. In either case erosion control cover will be placed. Lametti anticipates being off site by Friday,4-17-15 Project No. 807810 St. Croix WWTP Outfall Repairs Narrative of construction activities New 36"RCP pipe: il .ow_ ......,,_,,,..„.. ... --- .ate ��� - VP Coffer dam in river/removal&replacement of river piping: �. 0 ..- 2r. i .,a : 17 1-::,d Project No. 807810 St. Croix WWTP Outfall Repairs Narrative of construction activities Replacement of river piping: .. , . Replacement of river piping: L , , . . i "Ii , ii t` , 41, i f- - ,f-p;d0 „ it -. Project No. 807810 St. Croix WWTP Outfall Repairs Narrative of construction activities Removal of headwall in river: fr i. 4 k , . , ,,,..., .„ , „,, . , ‘ , .,,. , ,..„y u� \, ,.... ,„,„,, ,, . ,..___,.. ,,..,.._.,.. ,_„, . , . _ . Removal of headwall in river: r o Project No. 807810 St. Croix WWTP Outfall Repairs Narrative of construction activities Removal of upstream river piping: .:..,,..,,,,:,,, i y .. illis*,, l A I �•V.- 1 Removal of upstream river piping: } ` fit r,, .,, i ' Y„ ,j ., 3 r4 C§' gyp' , 4 �i 3 "r �{ Y ' 5 Project No. 807810 St. Croix WWTP Outfall Repairs Narrative of construction activities Replacement of upstream river piping: .... _t.. gip, :. 'siry^�e.�=�� a�t;.'e^ae{�i: .$ ,. ah • ';= �. , :jaw k. Nom: 4 -4' 4 *. t ,. 4 Poly cover over coffer dam: A.r t 5 A } Project No. 807810 St. Croix WWTP Outfall Repairs Narrative of construction activities Poly cover over excavation area: ,;1, ;4 it i, lii rofAikt:,,, 1 F .: � r a 1, F: 4 ..,I.r 1� at 1.:" te �/` -' i ' I*''' \t: 't't.'t: .1‘ Installation of poly cover over excavation area: �v a S 4.t.4,-- F 4�, :„ ter+ T ,.: 2C15, z Altik t3 EXHIBIT 3 Metropolitan Council Environmental Services SECTION 01010 SUMMARY OF WORK PART 1 GENERAL 1.1 SECTION INCLUDES A. Basic description of the Work, CONTRACTOR use of the premises, and COUNCIL occupancy requirements. B. Related work under other Contracts. C. Work by COUNCIL and COUNCIL furnished products. D. Sequencing and scheduling requirements. E. CONTRACTOR use of the site and premises. 1.2 LOCATION OF WORK A. The Work of this Contract is located within the following plant sites: 1. Project A: St. Croix Valley WWTP Aeration Piping Modifications and Outfall Repairs- St. Croix Valley Wastewater Treatment Plant, 6163 St. Croix Trail, Stillwater, Minnesota 55802. 2. Project B: Empire WWTP Headworks Ventilation Improvements—Empire Wastewater Treatment Plant,2540 W. 197t St., Farmington, MN 55024. 3. Project C: Empire WWTP RAS Chlorination - Empire Wastewater Treatment Plant, 2540 W. 197th St, Farmington, MN 55024. 4. Project D: Eagles Point WWTP Locker Room Improvements— Eagles Point Wastewater Treatment Plant, 9211 110th Street South, Cottage Grove,MN 55016 1.3 WORK DESCRIPTION A. The Wobs of this Contract inciud m;n 1. Aeration Piping Modifications and Outfall Repairs a. Demolition and abandonment of existing above ground and below ` ground aeration piping and appurtenances b. Air pipe penetration through the roof of the existing blower building c. The installation of new above ground welded stainless steel aeration piping, fittings, valves and structural supports d. The installation of three new air flow meters and three new actuated valves including conduit, wiring and connections to the existing control system e. Demolition of existing below ground outfall piping, and appurtenances f. Installation of new RCP outfall piping, manhole and riprap - MCES Project No 807810,800614,807820 Summary of Work Contract No. 13P219 01010-1 v Metropolitan Council Environmental Services g. Restoration of vegetated areas, asphalt and concrete surfaces and .....)('- other areas affected by the work h. Conformance with requirements set forth by permitting agencies 2. roject B:?`` - mpire WWTP Headworks ventilation Improvements . a. Provide a new natural gas fired, 7100 CFM make-up air unit for additional ventilation to the building's main floor level. b. Provide a new 7100 CFM exhaust air system connected to the t -e -xisting hoods located in the main level Truck Bay. c. • 'vide an underground natural gas service for-the new mak: up air uni d. Mod, return air ductwork in the Grit Pump Room. e. Gener- , Structural and Electrical construction associate, with the new m- - up and exhaust systems. f. Measure, :djust and record all existing and new air h, thing systems within the la,'Iding. g. Modify the e -ting 10-inch exhaust ducts located ' the Lower Level Screen Room I.866.0'),to create a 3-foot rem' able section of vertical ductwor . Power wash the interior of t existing 10-inch exhaust ducts with of water to remove scu -nd grease. h. Installation of bird n: ing at UV Roof. 3. Project C: Empire WWTP • 'S Chlorin- ion a. Installation of a heated,do •le-wailer,, 3,000 gallon chemical storage tank for sodium hypochlorite. b. Temperature, level, and leak •-t- - or sensors for the storage tank and other miscellaneous tank it: I s, c. Reinforced concrete pad with f,u •ation and sump for the chemical tank, d. Two peristaltic,chemical f:--• pumps :nd associated piping, e. Electrical wiring and cont •Is for the ch=mical pumps, f. Emergency eyewash- ower station, pi,'ng and controls, and 4. Project D: Eagles P.' t WWTP Locker Roo Improvements a. Adding a 12'-6"x 1='-6"addition to the locker ••m, b. Complete interior enovation of the Eagles Poin WWTP men's locker room c. Removal and -placement of interior finishes, d. One non-A 9 ' shower, e. Relocatio •f lockers, f. Salvage ''f existing lockers to be combined with new loc ers, g. Install on of heated floor system, h. Reno ation and upgrade of HVAC system, . i. Inst lation of two new sinks, j. M••ification of woman's locker room by extension of interior w.-I and i,stallation of a double swing privacy door. k. nstallation of bi-fold door and shelving at new closet in main hall :y. I. Installation of bird netting at UV Roof. 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EXHIBIT 1 0 Julie Hultman From: K.D.Widin <kdwidin @comcast.net> Sent: Monday,April 06, 2015 4:11 PM To: Eric Johnson; Mark Vierling (E-mail);Andrew Kegley; Betty Caruso;Julie Hultman; Scott Richards; Chris Long;Jennifer Pinski; Lisa Danielson; kyle.colvin @metc.state.mn.us Subject: Wastewater Treatment Plant Project - Tree Replacement Calculation OPH Staff/Met Council Engineering- I have reviewed the recently completed inventory of significant trees remaining on the Wastewater Treatment Plan site and completed the calculation of the Tree Replacement Requirement for that site.This takes into account not only the inches of significant trees being removed for the project but also the inches of significant trees which will remain on site after the construction has been completed. After completing the calculation I arrived at a Tree Replacement Requirement of 106.8 inches. As stated in the Oak Park Heights Tree Preservation Ordinance#1307, because the project was removing less than half of the existing significant trees on the site, I also applied a 10%reduction in replacement inches required. The final total for the Tree Replacement Requirement for this project (rounded to the nearest whole number value)is then 96 in.,which is the equivalent of 48,2-inch caliper trees. Please contact me if you have any questions regarding this report. Kathy Widin Arborist-Forestry Consultant City of Oak Park Heights 1