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NPU DAF Site Plan Application and Attachments (9-4-18)
77 Hartland Street, Suite 201 East Hartford, CT 06108 tel: 860-529-7615 September 4, 2018 Town of Montville Planning Department 310 Norwich New London Turnpike Uncasville, CT 06382 Via email to: Ms. Colleen Bezanson Assistant Planner/GIS Specialist, Planning Department CBezanson@montville-ct.org Subject: Norwich Public Utilities Stony Brook Water Treatment Plant, Dissolved Air Flotation Clarifier System Site Plan Application Dear Planning Department: This letter and the attached information is submittal of the Site Plan for planned construction of water treatment facility improvements at the Norwich Public Utilities (NPU) Stony Brook Water Treatment Plant (WTP), located on Cherry Lane in the Town of Montville. The project includes a new building to be added to the WTP site, which will house the two dissolved air flotation (DAF) units and the associated equipment. Some improvements are also shown to the existing facility building. The total capacity of the two DAF clarifiers is 4 million gallons per day, equal to Stony Brook WTP’s capacity. As discussed, this project has been reviewed by the Montville Inland Wetlands and Watercourses Commission at their May 17, 2018 meeting. As detailed in the project’s contract documents, this work includes the following components: 1. Construction of a new Dissolved Air Flotation (DAF) Building to be added on the east side of the existing Stony Brook WTP building as shown on Drawings. 2. Installation of two 2.0 million gallon per day (mgd) DAF package treatment units with associated piping and appurtenances to connect to the existing package filter units inside the Stony Brook WTP. 3. Demolition and replacement of various existing equipment and pipelines inside the Stony Brook WTP, including removal of the existing media and associated piping and supports in the clarifier basins of the package filter units; removal of the existing media in the filtration Montville Planning Department September 4, 2018 Page 2 basins of the package filter units; installation of the new filter media; and upgrades and modifications to aluminum chlorohydrate and polymer chemical systems, and backwash system. 4. Dewatering, drainage, erosion control and supported structures and pipelines. 5. Upgrades to the existing plant wide supervisory control and data acquisition system (SCADA) system to accommodate the addition of the new facilities. 6. Construction of electrical system upgrades including new motor control centers and other equipment. 7. All site work, cleanup, yard piping, and buried electrical distribution work. 8. All other work necessary to complete the work including demolition, temporary facilities, bypass pumping systems, masonry, roofing, painting, plumbing, fire protection, HVAC, electrical, instrumentation and controls and maintenance of plant operations during construction. If you have any questions, please contact me at 860-808-2266 or sistareec@cdmsmith.com. Sincerely, Elaine Sistare, P.E., BCEE Senior Project Manager CDM Smith Inc. Attachments: 1. Site Plan Application 2. Site Plan Checklist 3. USGS quad map 4. Location map 5. Watershed Boundary Map 6. CDM Smith Design Drawings EX-1, C-1 through C-7, A-3 and E-5 dated May 2018 (half-size) 7. Riprap and retaining wall design information 8. DPH Project Approval cc: Tom Cutler, Mark Decker, Chris LaRose, Mary Lou Rychling; NPU Brendan Ennis, Al LeBlanc; CDM Smith H:\REGULATIONS\Site Development Guidelines - Checklists\Current\13 SITE DEVELOPMENT GUIDELINES AND APPLICATIONS REV 8182017 MMG.doc Town of Montville Planning & Zoning Commission Site Plan or Special Permit Application Site Plan Number ____________ Plan Date ________________ Revision ________________ Special Permit Fee paid ____________ Revision ________________ ____________________________________________________ Assessors Map ___________ Lot ______________ Project Address _______________________________________________________________ Name of Applicant ____________________________________________________________ Address of Applicant __________________________________________________________ Project Name ________________________________________________________________ Tel #_____________ Fax #_______________ Email_________________________________ Name of Property Owner _______________________________________________________ Name of Attorney ____________________________________________________________ Tel #_____________ Fax #_______________ Email_________________________________ Name of Engineer ____________________________________________________________ Tel #_____________ Fax #_______________ Email_________________________________ ____________________________________________________ Zoning District ____________ Lot Size ______________ Total Acres___________ Yes No Regulated Wetlands Acreage __________ Permit Date ______________ Yes No Flood Plain Flood Hazard Area ___________________________ Yes No A-2 Survey Name of Surveyor ____________________________ Building size __________s.f. Building height ______________________________ Number of acres to be disturbed _________________________________________________ Applicable Zoning Regulation(s)_________________________________________________ Project description ____________________________________________________________ ___________________________________________________________________________ ____________________________________________________ Waiver(s) requested yes no Regulation section(s) ______________________ This project will use: Septic system Municipal sewer Individual well Public water supply well SCWA well Municipal water Yes No This project is located in a Public Water Supply Watershed Yes No This project has received approval from the Uncas Health District Yes No This project has received approval from the appropriate Water Authority ** Attach Copy of All Approvals Site Plan /Special Permit Application Page 1 of 2 H:\REGULATIONS\Site Development Guidelines - Checklists\Current\13 SITE DEVELOPMENT GUIDELINES AND APPLICATIONS REV 8182017 MMG.doc Yes No This project requires a State General Stormwater Quality Permit. Registration # _______________ Yes No This project requires a permit from the Army Corps of Engineers. Yes No This project requires a Water Diversion Permit. Yes No This project requires a Dam Permit. Yes No This property is subject to a Conservation Restriction and/or a Preservation Restriction. If yes, attach a copy of certified notice. Yes No Drainage calculations submitted: Date _________ Rev. date _________ Rev. date _________ ______________________________________________________________________________ Yes No This project requires a State Traffic Commission Permit. Yes No This project requires a DOT Encroachment Permit. Yes No The plan has been submitted to the DOT District 2 Office. Number of parking spaces provided _______________ Number of vehicle trips per day generated by this project ______________ ______________________________________________________ Signature of Applicant ____________________________________________ Date __________ Signature of Owner ____________________________________________ Date __________ Site Plan /Special Permit Application Page 2 of 2 H:\REGULATIONS\Site Development Guidelines - Checklists\Current\13 SITE DEVELOPMENT GUIDELINES AND APPLICATIONS REV 8182017 MMG.doc Site Plan Review Checklist Site plans are required for all commercial and industrial uses and residential special permits. Site plans shall comply with Section 18.3 of the Zoning Regulations and shall be drawn at a scale of 1"=40' or at a scale approved by the Planning Director. (Maximum size 24" x 36") A site plan shall be prepared by either an architect, professional engineer and/or land surveyor licensed and registered to practice in Connecticut as deemed appropriate by the Commission. The Commission shall have the right to require that a site plan be prepared by a professional engineer if the proposed development will include the design of roads, storm drainage facilities, water systems and sewerage systems. If the proposed development includes wetlands, the Commission shall have the right to require that a certified soil scientist delineate the wetlands. The signed seal(s) of those who prepared the site plan shall be included on the site plan. A site plan shall conform with class A-2 standards for accuracy in accordance with "Code of Recommended Practice for Accuracy of Surveys and Maps", a publication approved for use by the Connecticut State Board of Examiners for professional engineers and land surveyors, unless otherwise modified by the town planner. A written statement describing the proposed use or uses in sufficient detail will be submitted with each site plan to determine compliance with the permitted uses or special permits in the applicable district. A location map at a scale of one inch (1") equals 2,000 feet shall be submitted showing the subject property, streets, lot lines, and zoning district boundaries within 1,000 feet of the subject property. If space permits, the location map may be included as an insert on the site plan as required in section 8.3. An 8-½ x 11 inch photocopy of a USGS quad map with the project outlined must accompany the site plan. The name and address of the applicant and owner of record. North arrow, scale, date of the drawing or its revision and the name(s) and seal(s) of those persons preparing the site plan. Property boundaries, dimensions, and area in acres and square feet and all existing monuments, pipe markers and other physical evidence concerning property boundaries. Zoning districts and dimensions of all yards as required by these regulations. This information will be shown in both mapped and tabular form. Existing and proposed contour lines at 5 ft. Intervals. The Planning Director may require a 2 ft. Contour interval in order to clearly show topography and drainage. Location, width, and purpose of all existing and proposed easements and rights-of-way on the property. Location of all existing watercourses, wetlands, public water supply watershed boundaries, bedrock outcrops, and where appropriate, the mean high water line, flood hazard areas, and channel encroachment lines. Location and size in square feet of all existing and proposed structures including underground storage tanks and uses on the property and the approximate locations and size of all existing structures on the abutting properties which are within 100 feet of the property lot lines. Location of all storage areas for materials, supplies, products, vehicles and equipment that will not be kept inside a structure as required by the zoning regulations. Location, size, and arrangement of all parking and loading areas including existing and proposed driveway entrances and exits. The Planning Director may require the applicant to submit a traffic evaluation report prepared by a traffic engineer if the proposed development will significantly impact traffic flow. Location, size, and arrangement of all pedestrian walkways and sidewalks. Location, layout, type, and size of buffer or landscape area, plant materials, fencing, screening devices, or other materials proposed for use. Site Plan Review Checklist Page 1 of 2 H:\REGULATIONS\Site Development Guidelines - Checklists\Current\13 SITE DEVELOPMENT GUIDELINES AND APPLICATIONS REV 8182017 MMG.doc Location, size, height, lighting, and orientation of all signs. Location, size, height, and orientation of all outdoor lighting facilities. The stormwater drainage system, including the location and elevations of all existing and proposed street drainage facilities within 100 feet of the property. The Planning Director may require additional information and/or details regarding off-site drainage features affected by, or impacting upon the proposed development. Location, size, and type of all water and fire protection facilities. Location, size, and type of all sewerage disposal facilities. Building elevations or preliminary architectural drawings showing the general type of building proposed for construction. In cases where the applicant intends to develop in stages, an overall site staging plan shall be required. The Commission may require the applicant to submit an environmental evaluation report for a proposed development located in an environmentally sensitive area. Evaluation reports by independent professionals and other experts such as hydrologists, geologists and soil scientists may be required at the expense of the applicant. All signature and waiver blocks must be located in the lower right corner. Waivers The Commission may waive one or more of the site plan ingredient requirements of Section 18.3 if it finds that the information is not necessary to reach a decision on the application. A waiver of the applicable section or sections must be requested in writing by the applicant. Please refer to the Zoning Regulations to insure that you meet all requirements for setbacks, parking, signs, etc. Site Plan Review Checklist Page 2 of 2 Water TreatmentPlant Site Location(Montville, CT) Norwich, ConnecticutNorwich Public UtilitiesStony Brook Water Treatment PlantUSGS Quadrangle Map Note: The 2018 Fitchville and Palmerton Quadrangles were obtained from the USGS. 0 2,000Feet±Scale 1 inch = 2,000 feet Stony BrookReservoir Water TreatmentPlant Site Location(Montville, CT) Leffingwell Road Leitao DriveO ld S alem R o a dWawecus Hill RoadCherry Lane State Hwy 163Caroline Road Noble Hill RoadMeeting House LaneLisa Lane South Road State Hwy 82 Simpson Lane Teddy LaneVelgouse RoadFitch Hill RoadW alker Road Carey LaneBlais RoadRene Dr i veAutumn WayLauren Lane Tra M art Drive Raymond Hill Road Oxoboxo Dam Road Bi shop RoadBriar Hill Road R120 R40 R40 R40 R40 R40 R80 WRP-10 Norwich, ConnecticutNorwich Public UtilitiesStony Brook Water Treatment PlantSite Plan Note: Property line data from CT DEEP. Zoning information from Montville's AxisGIS website and no warranty or gaurantee for this data is given. 0 2,000Feet±Scale 1 inch = 2,000 feet T.O. SLAB 260.32 B.O. ROOF STEEL AT LOW POINT 283.32 E 2 A-3 23'-0"DCBA F G H 18'-0"17'-0"17'-0"17'-0"15'-0"13'-9"13'-9" T.O. EXIST. WALL 280.00 F.1 4 A-4 8" 3 A-4 SIM T.O. SLAB 260.32 B.O. ROOF STEEL AT LOW POINT 283.32 1 A-3 +/-25'-11"2 134 8'-8"4'-0"6'-0"2'-0"4'-9"4'-0" 12 1/2 14'-6"15'-0"15'-8" T.O. EXIST. WALL 280.00 L-105 L-104 L-103 18'-0"7'-4"R.O.T.O. SLAB 260.32 B.O. ROOF STEEL AT LOW POINT 283.32 1 A-321 3 4 +/-25'-10"17'-6"2'-6"4'-0"5'-0"4'-0"5'-0" 14'-6"15'-0"15'-8" 12 1/2 18'-0"T.O. EXIST. WALL 280.00 L-102L-101L-100 7'-4"R.O.T.O. SLAB 260.32 B.O. ROOF STEEL AT LOW POINT 283.32 E 2 A-3D C B AFGH 15'-0"17'-0"17'-0"17'-0"18'-0" F.1 10'-0"27'-10 3/8"5 A-4 T.O. SLAB 260.32 B.O. ROOF STEEL AT LOW POINT 283.32 1 A-3 2 134 14'-6"15'-0"15'-8"23'-0"A-4 1 A-4 2 T.O. EXIST. WALL 280.00 T.O. SLAB 260.32 B.O. ROOF STEEL AT LOW POINT 283.32 E 2 A-3D C B AF 15'-0"17'-0"17'-0"17'-0"18'-0" F.1 8" A B C D E F G H 1 2 3 4 © 2014 CDM SMITH ALL RIGHTS RESERVED.REUSE OF DOCUMENTS: THEESE DOCUMENTS AND DESIGNS PROVIDED BY PROFESSIONAL SERVICE, INCORPORATED HEREIN, ARE THE PROPERTY OF CDM SMITH AND ARE NOT TO BE USER, IN WHOLE OR PART, FOR ANY OTHER PROJECT WITHOUT THE WRITTEN AUTHORIZATION OF CDM SMITH.DATE: APPROVED BY: CROSS CHK'D BY: SHEET CHK'D BY: DRAWN BY: DESIGNED BY: MAY 2018 77 Hartland Street, Suite 201 East Hartford, Connecticut 06108 Tel: (860) 808-2266 PROJECT NO. FILE NAME: SHEET NO. REMARKSCHKDDRWNDATEREV. NO. CITY OF NORWICH, CONNECTICUT STONY BROOK WATER TREATMENT PLANT DISSOLVED AIR FLOTATION CLARIFIER SYSTEM S. BRADFORD A. MICHAEL G. STEIN A. LEBLANC B. GIORGI DISSOLVED AIR FLOTATION BUILDING BUILDING ELEVATIONS AND SECTIONS A-3 96538-221206 ASZ001DF ISSUE FOR BID 1/8" = 1'-0" EAST ELEVATION 1/8" = 1'-0" NORTH ELEVATION 1/8" = 1'-0" SOUTH ELEVATION 1/8" = 1'-0" WEST ELEVATION 1/8" = 1'-0"A-2 2 BUILDING SECTION 1/8" = 1'-0"A-2 1 BUILDING SECTION EXISTING TREATMENT BUILDING ALUM. GUTTER WITH DOWNSPOUTS INSULATED SIDING PANELS AND ROOFING PANELS FOR DAF BLDG AND VESTIBULE TO MATCH IN COLOR AND PROFILE PROVIDE INSIDE CORNER EXPANSION JOINT COMPLETE WITH NEOPRENE SEAL AGAINST EXISTING SPLIT FACE CMU SURFACE, SECURE AND SEAL TO METAL SIDING AND CMU LIGHT FIXTURE (TYP.) EXISTING TREATMENT BUILDING LIGHT FIXTURE (TYP.) PROVIDE INSIDE CORNER EXPANSION JOINT COMPLETE WITH NEOPRENE SEAL AGAINST EXISTING SPLIT FACE CMU SURFACE, SECURE AND SEAL TO METAL SIDING AND CMU PROVIDE INSIDE CORNER FLASHING COMPLETE WITH NEOPRENE SEAL AGAINST EXISTING SPLIT FACE CMU SURFACE, SECURE AND SEAL TO METAL SIDING AND CMU LIGHT FIXTURE (TYP.) LIGHT FIXTURE (TYP.) 12'Wx10'H INSULATED HIGH LIFT SECTIONAL OVERHEAD DOOR X BRACING LOCATIONS TYP. FLASHING AT ROOF TO WALL INTERSECTION EXISTING NEW EXISTING NEW EXISTING TREATMENT BUILDING NEW SPLIT FACE PARAPET AT EXIST. BLDG. - MATCH EXISTING COLOR AND HEIGHT DOWNSPOUTS TYP. @ EA. COL. LINE DOWNSPOUTS ALUM COPING TO MATCH EXISTING COLOR NEW ONE PIECE CORNER COPING PIECE - TO MATCH EXISTING ROOF - WALL FLASHING BY BLDG MANUFACTURER NEW 1 PIECE CORNER COPING N A B C D E F G H 1 2 3 4 RH-1BU-1(1) RH-1BU-1(1) RH-1 BU-1(1) EDG 44 44 43 RH-1 BU-1(1) RH-1 BU-1(1) NOTE 5 NOTE 5 BU-1 1 RH-1 BU-1(1) 21 3 4 A B C D E F G H 10'-0" MAX (TYP.) 5'-0" MAX (TYP.)~~~~~~~~~~~~~A B C D E F G H 1 2 3 4 © 2014 CDM SMITH ALL RIGHTS RESERVED.REUSE OF DOCUMENTS: THEESE DOCUMENTS AND DESIGNS PROVIDED BY PROFESSIONAL SERVICE, INCORPORATED HEREIN, ARE THE PROPERTY OF CDM SMITH AND ARE NOT TO BE USER, IN WHOLE OR PART, FOR ANY OTHER PROJECT WITHOUT THE WRITTEN AUTHORIZATION OF CDM SMITH.DATE: APPROVED BY: CROSS CHK'D BY: SHEET CHK'D BY: DRAWN BY: DESIGNED BY: MAY 2018 77 Hartland Street, Suite 201 East Hartford, Connecticut 06108 Tel: (860) 529-7615 PROJECT NO. FILE NAME: SHEET NO. REMARKSCHKDDRWNDATEREV. NO. J. CLEMENTE J. CLEMENTE J. DONALDSON A. LEBLANC N. HOLWAY STONY BROOK WATER TREATMENT PLANT DISSOLVED AIR FLOTATION CLARIFIER SYSTEM CITY OF NORWICH, CONNECTICUT ELECTRICAL DAF AREA LIGHTING AND SYSTEMS PLAN ISSUED FOR BID E-5 96538-221206 EWZ001DF 1/8" = 1'-0" ELECTRICAL DAF BUILDING LIGHTING PLAN 3 a 3 b 3 a 3 b 3 c 3 c Lighting Fixture Schedule Type Description Manufacturer Electrical Data Comments A 48" X 9.5" IP66 WET LABEL RATED. EXTRUDED ALUMINUM HOUSING. 4000K DOUBLE LED ARRAY, STANDARD DRIVER. SELUX SUR9L 2L35 OR EQUAL 277 V/1-64 VA FURNISH WITH APPROPIATE MOUNTING HARDWARE. B IP66 INGRESS PROTECTION RATED AND UL 1598 WET LOCATION LISTED. CLASS 2 RATED, OPERATING TEMPERATURE OF -40 TO 55 DEGREES CELSIUS. ONE-PIECE DIE-CAST ALUMINUM HOUSING. LUMARK WAL-PAK 2LED OR EQUAL 277 V/1-70 VA PROVIDE WITH INTEGRAL PHOTOCELL CONTROL. PROVIDE WITH BATTERY BACKUP FOR FIXTURES ABOVE EXTERIOR DOORS. (NOTE 4) BU-1 2-HEAD NEMA 4X EMERGENCY LIGHT UNIT. 100W BATTERY CAPACITY. MINIMUM OF 90 MINUTES EMERGENCY ILLUMINATION. MAINTENANCE FREE, LEAD-ACID BATTERY WITH TEST SWITCH AND STATUS INDICATOR. LITHONIA INDX1236 OR EQUAL. 277 V/1-100 VA EDG ABL RECESSED EXIT SIGN. WET LOCATION LISTED. MAX 5 WATTS. LITHONIA EDG OR EQUAL 0 V/1-0 VA RH-1 2-HEAD REMOTE UNIT. NEMA 4X. WET LOCATION LISTED, WEATHERPROOF AND GASKETED. 1 WATT PER LAMP HEAD. LITHONIA ELA LED WP OR EQUAL 277 V/1-0 VA 4 c A A A A B B B B B BB BU-1 EDG EDG B MOUNTED AT 11 FT A.F.F. (ABOVE OVERHEAD DOOR) WET c c b a DRY 44 44 44 44 43 43 43 4343 43 43 43 0 16'8'4' 1/8" = 1'-0"SCALE: 1/8" = 1'-0" ELECTRICAL DAF BUILDING SYSTEMS PLAN F 60 F60 F 15 WET DRY NOTES: 1. LINEAR HEAT DETECTOR, TO BE MOUNTED ON CEILING SURFACE. MAXIMUM LENGTH OF CABLE RUN AND SPACING SHALL BE DETERMINED BY THE CONTRACTOR BY COORDINATING WITH CABLE MANUFACTURER. SEE SPECIFICATION SECTION 16720 FOR FURTHER DETAIL. 2. INDIVIDUAL ADDRESSABLE MODULE TO BE PROVIDED IN NEMA 4X JUNCTION BOX AS PART OF HEAT DETECTION SYSTEM. MODULE TO BE WIRED BACK TO THE FIRE ALARM CONTROL PANEL IN THE ELECTRICAL ROOM. SEE SHEET E-4 FOR LOCATION. 3. END-OF-LINE ZONE BOX TO BE PROVIDED IN NEMA 4X JUNCTION BOX AS PART OF HEAT DETECTION SYSTEM. INSTALL TEST SWITCH AND END-OF- LINE RESISTOR WITHIN BOX. 4. FIXTURES DESIGNATED FOR USE AS EMERGENCY EGRESS LIGHTING SHALL BE WIRED TO THE LINE SIDE OF THE SWITCH FOR THE SUPERVISED CIRCUIT. 5. REMOTE HEAD TO BE MOUNTED ON HANDRAIL OF DAF BRIDGE. FURNISH AND INSTALL APPROPIATE MOUNTING HARDWARE. GENERAL NOTES: 1. CONTRACTOR SHALL NOT MOUNT OR FASTEN SUPPORTS ONTO NEW OR EXISTING WALLS FOR MOUNTING OF ANY ELECTRICAL EQUIPMENT OR COMPONENTS, TO INCLUDE SWITCHES AND RECEPTACLES. CONTRACTOR TO PROVIDE UNISTRUT RACKS AND ADDITIONAL ACCESSORIES NECESSARY TO MOUNT CONDUITS OFF OR AWAY FROM THE WALLS. ALL INSTALLATIONS SHALL COMPLY WITH THE NATIONAL ELECTRICAL CODE. 2. FOR CONDUIT AND WIRING TO FIXTURES, REFER TO PANELBOARD SCHEDULE FOR PP-HV ON SHEET E-7. 3. TYPE 'A' AND 'AE' FIXTURES TO BE PENDANT MOUNTED AT 20 FT A.F.F. UNLESS OTHERWISE NOTED. 4. TYPE 'B' FIXTURES TO BE MOUNTED AT 8.5 FT A.F.F. UNLESS OTHERWISE NOTED. 5. TYPE 'EM1' FIXTURES TO BE MOUNTED AT 8.5 FT A.F.F. UNLESS OTHERWISE NOTED. 6. TYPE 'RH1' FIXTURES TO BE MOUNTED AT 8.5 FT A.F.F. UNLESS OTHERWISE NOTED. 7. TYPE 'EDG' FIXTURES TO BE MOUNTED AT 8.5 FT A.F.F. UNLESS OTHERWISE NOTED. TO EXISTING PROCESS BUILDING TO EXISTING PROCESS BUILDING IAMEOL NOTE 2 NOTE 3 NOTE 1 SURFACE MOUNT TYPE 'A' AND 'AE' FIXTURES ABOVE DAF BRIDGE 44 43 2 0 16'8'4' 1/8" = 1'-0"SCALE: A a 43 A b 43 A a 43 A a 43 A a 43 A a 43 A b 43 A b 43 A b 43 A b 43 A a 43 A a 43 A a 43A a 43 A a 43A a 43 A b 43A b 43 A b 43A b 43 A b 43 A b 43 EDG 43 SECTION M.12 BEARING AREAS RIPRAP SLOPE PAVING & SLOPE PROTECTION WATERPROOFING AND DAMPPROOFING STONE AND GRANITE SLOPE CURBING CALCIUM CHLORIDE FOR DUST CONTROL WOOD M.12.01—Bearing Areas M.12.02—Riprap M.12.03—Slope Paving M.12.04—Waterproofing M.12.05—Dampproofing M.12.06—Stone Curbing M.12.07—Granite Slope Curbing M.12.08—Granite Stone Curbing for Bridges M.12.09—Vacant M.12.10—Calcium Chloride for Dust Control M.12.11—Vacant M.12.12—Concrete Block for Slope Protection M.12.13—Wood M.12.01—Bearing Areas: Materials for this work shall conform to the following requirements: 1. Vacant 2. Prefabricated Pads: Prefabricated pads shall consist of cotton duck impregnated with rubber and shall be a single sheet of 1/8 inch (3.2 millimeters) minimum thickness with a tolerance of plus 15% or minus 5%, composed of 8 ounce (227 grams) duck and high quality natural rubber constructed in five or more plies. The breakdown stress for compression perpendicular to the plane of lamination shall be not less than 11,000 pounds psi (76 megapascals). M.12.02—Riprap: Materials for this item shall consist of sound, tough, durable and angular rock, free from decomposed stones or other defects impairing its durability. The size of a stone as hereinafter specified shall be its least dimension. Broken concrete or rounded stones are not acceptable. The type of material to be used shall be as noted on the plans, in the special provisions or as may be ordered by the Engineer. 1. Standard Riprap: This material shall conform to the following requirements: (a) Not more than 15% of the riprap shall be scattered spalls and stones less than 6 inches (150 millimeters) in size. (b) No stone shall be larger than 30 inches (760 millimeters) in size, and at least 75% of the weight (mass) shall be stones at least 15 inches (380 millimeters) in size. 2. Intermediate Riprap: This material shall conform to the following gradation: Stone Size % of the weight (mass) 18 inches (460 millimeters or over) 0 10 inches to 18 inches (255 millimeters to 460 millimeters) 30-50 6 inches to 10 inches (150 millimeters to 255 millimeters) 30-50 4 inches to 6 inches (100 millimeters to 150 millimeters) 20-30 2 inches to 4 inches (50 millimeters to 100 millimeters) 10-20 less than 2 inches (less than 50 millimeters) 0-10 3. Modified Riprap: This material shall conform to the following gradation: Stone Size % of the weight (mass) 10 inches (255 millimeters or over) 0 6 inches to 10 inches (150 millimeters to 255 millimeters) 20-50 4 inches to 6 inches (100 millimeters to 150 millimeters) 30-60 2 inches to 4 inches (50 millimeters to 100 millimeters ) 30-40 1 inch to 2 inches (25 millimeters to 50 millimeters) 10-20 less than 1 inch (less than 25 millimeters) 0-10 4. Special Riprap: This material shall conform to the gradation of Article M.01.01 for No. 3 stone. M.12.03—Slope Paving: The stone for this work shall consist of sound, tough, durable rock, free from decomposed stone or other defects impairing its durability. Each piece shall have an area on its exposed surface of not less than 2 square feet (0.2 square meter) and a thickness not less than 9 inches (230 millimeters), except that stone for the two bottom rows shall be of such size that they can be embedded at least 2 feet (610 millimeters) into the ground; and they shall have a thickness of not less than 12 inches (305 millimeters). Concrete slabs shall conform to the dimensions given above for stone, except that the maximum surface dimensions shall not exceed 10 linear feet (3 meters) in any direction. The concrete shall conform as regards materials and proportions, to the requirements of Article M.03.01 and M.03.02 for Slope Paving Concrete. M.12.04—Waterproofing: The materials for this work shall conform to the following requirements: 1. Waterproofing Asphalt: For woven glass fabric, the seal coat material shall be an asphalt conforming to ASTM D 449, Type III. Asphalt flashing cement shall be a compound of asbestos and asphalt conforming to the requirements of ASTM D 2822. Primer for use with asphalt in waterproofing shall conform to the requirements of ASTM D 41. 2. Fabric: Woven glass fabric saturated with asphalt shall conform to the requirements of ASTM D 1668. Resin-treated woven glass fabric shall conform to the requirements of ASTM D 1668 and shall be compatible for use with asphalt. 3. Mortar: Mortar shall conform to the requirements of Article M.11.04. 4. Reinforcement: Reinforcement shall conform to the requirements of Article M.06.01. 5. Metal Flashing: Metal flashing shall be of the type and dimensions called for on the plans, and the quality shall be acceptable to the Engineer. 6. Joint Filler: Filler for use in horizontal joints shall be a straight refined petroleum asphalt conforming to the following requirements: Min. Max. Penetration at 77oF (25oC)., 100 grams., 5 seconds 50 60 Flashpoint, open cup method, in oF (oC) 450 (232) Softening point, in oF (oC) 120 (49) 130 (55) Loss on heating, at 325oF (163oC), 50 grams, 5 hours, % 0.5 Ductility, at 77oF (25oC), 5 centimeters per minute 85 Total bitumen (Sol. in carbon disulphide) % 99.5 © 2018 CDM Smith 96538-221206 All Rights Reserved 3/16/2018 NPU DAF Improvements Concrete Segmental Retaining Wall 02851 - 1 SECTION 02851 CONCRETE SEGMENTAL RETAINING WALL PART 1 GENERAL 1.01 SCOPE OF WORK A. Furnish all labor, materials, equipment and incidentals necessary for design, inspection and construction of modular concrete retaining walls including coping units, drainage system, wall penetrations and railing as shown on the Drawings and specified herein. 1. Design, inspection and certification by a Connecticut Registered Professional Engineer. 2. Excavation and foundation soil preparation. 3. Furnishing and placement of leveling base. 4. Furnishing and placement of the drainage system. 5. Furnishing and placement of geotextiles. 6. Furnishing and placement of segmental retaining wall units. 7. Furnishing and compaction of drainage and retained soils. 1.02 RELATED WORK A. Earthwork is included in Section 02200. B. Geotextile filter fabric shall be as specified in Section 02230. C. Granular materials is included in Section 02230. 1.03 REFERENCE STANDARDS A. Engineering Design 1. NCMA Design Manual for Segmental Retaining Walls, Second Edition. 2. NCMA TEK 2-4 - Specifications for Segmental Retaining Wall Units. 3. NCMA SRWU-2 - Determination of Shear Strength between Segmental Concrete Units. B. Segmental Retaining Wall Units 1. ASTM C 140 - Sampling and Testing Concrete Masonry Units 2. ASTM C 1262 - Evaluating the Freeze - Thaw Durability of Manufactured Concrete Masonry Units and Related Concrete Units. © 2018 CDM Smith 96538-221206 All Rights Reserved 3/16/2018 NPU DAF Improvements Concrete Segmental Retaining Wall 02851 - 2 3. ASTM C 33 - Specification for Concrete Aggregates 4. ASTM C 90 - Standard Specification for Load-Bearing Concrete Masonry Units 5. ASTM C 150 - Specification for Portland Cement 6. ASTM C 595 - Specification for Blended Hydraulic Cements. C. Geotextile Filter 1. ASTM D 4751 - Standard Test Method for Apparent Opening Size D. Soils 1. ASTM D 1557 - Laboratory Compaction Characteristics of Soil Using Modified Effort 2. ASTM D 6913 - Gradation of Soils 3. ASTM D 4318 - Liquid Limit, Plastic Limit and Plasticity Index of Soils 4. ASTM D G51 - Soil pH E. Where specifications and reference documents conflict, the Owner or Owner’s representative shall make the final determination of applicable document. 1.04 SUBMITTALS A. Submit to the Engineer as provided in Section 01300, samples of the modular concrete wall modules, coping units, drainage pipe, and geotextile. Engineer will approve sample of wall unit at the project site. Do not deliver sample to Engineer. B. Submit to the Engineer calculations and drawings for the design of the wall, reinforcing, foundations indicating that the wall will be stable against all forces acting on it. Identify means to accommodate adjacent or penetrating pipelines as part of the wall design and construction. Calculations and drawings shall be prepared by, and shall bear the stamp of, a Professional Engineer registered in the State of Connecticut, engaged by the Contractor, and qualified in the design of concrete segmental retaining walls or similar systems. Provide three sets of stamped construction drawings and detailed design calculations suitable to obtain city permits. The design calculation and drawings shall include: 1. Details and dimensions of the walls, reinforcing, foundations, connections, drainage systems, materials, coping and installation procedures. 2. A listing of design criteria, including codes, references, material strengths, assumed soil and concrete block design properties, design groundwater levels, loads, load factors and combinations, design methods and assumptions. C. Manufacturer’s certifications for materials used, including, but not necessarily limited to: 1. Precast concrete wall units, coping units and pins. © 2018 CDM Smith 96538-221206 All Rights Reserved 3/16/2018 NPU DAF Improvements Concrete Segmental Retaining Wall 02851 - 3 2. Concrete adhesive. 3. Geotextile filter fabric. 4. Drainage pipe. 5. Geosynthetic reinforcement (if required per design). D. Submit to the Engineer, written certification from the manufacturer, or his/her representative, that the concrete segmental retaining walls have been properly installed in accordance with the manufacturer's recommendations. 1.05 DESIGN CRITERIA A. Design shall be in accordance with the manufacturer's recommendations of concrete modular retaining walls. B. A maximum allowable soil bearing pressure equal to 4,000 psf for undisturbed, natural inorganic glacial till, or a maximum allowable bearing pressure of 2,000 psf for undisturbed, inorganic granular soils shall be assumed for purposes of the design. C. Footing shall be as required by precast concrete wall manufacturer. D. Wall shall be designed for seismic loading in accordance with the State of Connecticut Building Code. E. Walls shall be designed in accordance with recommendations of the NCMA Design Manual for Segmental Retaining Walls, Second Edition. The following is a summary of the minimum factors of safety for the various modes of failure evaluated in the proposed design. 1. External Stability a. Base Sliding 1.5 b. Overturning 1.5 c. Bearing Capacity 2.0 d. Global Stability 1.3 2. Internal Stability a. Shear Capacity 1.5 F. The minimum wall embedment shall be the greater of 1) the height of a SRW unit, 2) 0.5 ft or 3) the minimum embedment required because of the slope below the wall: Slope Below Wall Minimum Embedment Level H/10 3 : 1 (18.4 deg) H/10 2 : 1 (26.5 deg) H/7 G. A minimum uniform surcharge load of 250 psf shall be applied to the top of the wall for each design cross-section to account for potential material staging and/or equipment operation adjacent to the finished wall. © 2018 CDM Smith 96538-221206 All Rights Reserved 3/16/2018 NPU DAF Improvements Concrete Segmental Retaining Wall 02851 - 4 H. Design shall include evaluation of anticipated hydrostatic pressures acting behind the wall. Retaining wall design shall include a properly sized groundwater drainage system installed behind the wall to control groundwater and prevent accumulation of water behind the wall. The drainage system shall be shown on the shop drawings. If no subsurface drainage system is included in the retaining wall design, calculations shall assume groundwater levels behind the wall to be equivalent to the ground surface elevation immediately adjacent to the top of the wall. I. Coordinate the design with the new structure behind the proposed wall, including foundation loading from the structure. 1.06 QUALITY ASSURANCE A. The quality of all materials, the process of manufacture, and the finished sections shall be subject to inspection and approval by the Engineer, or other representative of the Owner. Such inspection may be made at the place of manufacture, or on the work after delivery, or at both places and the materials shall be subject to rejection at any time on account of failure to meet any of the requirements specified herein; even though samples may have been accepted as satisfactory at the place of manufacture. Material rejected after delivery to the site shall be marked for identification and shall be removed from the site at once. All materials which have been damaged after delivery will be rejected, and if already installed, shall be acceptably repaired, if approved, or removed and replaced, at no additional cost to the Owner. B. At the time of inspection, the materials will be carefully examined for compliance with the ASTM standards specified herein and this Section and with the approved manufacturer's drawings. All components shall be inspected for general appearance, dimension, "scratch- strength", blisters, cracks, roughness, soundness, etc. The surface shall be dense and close- textured. 1.07 DELIVERY, STORAGE AND HANDLING A. Contractor shall check the materials upon delivery to assure that proper material has been received. B. Contractor shall prevent excessive mud, wet cement, epoxy, and like material which may affix themselves, from coming into contact with the materials. C. Contractor shall protect the materials from damage. Damaged material shall not be incorporated into the retaining wall system. PART 2 PRODUCTS 2.01 MATERIALS A. Modular Concrete Retaining Wall 1. The manufacturer shall be licensed and authorized to produce the retaining wall units by the precast modular block system patent holder/licensor and shall document compliance with the published quality control standards of the proprietary precast modular block system licensor for the previous three years. © 2018 CDM Smith 96538-221206 All Rights Reserved 3/16/2018 NPU DAF Improvements Concrete Segmental Retaining Wall 02851 - 5 2. Concrete used in the production of the precast modular block units shall be first-purpose, fresh concrete. It shall not consist of returned, reconstituted, surplus, or waste concrete. It shall be an original production mix meeting the requirements of ASTM C94 and exhibit the following: a. Minimum 28-day compressive strength of 4,000 psi b. Shall be free of water soluble chlorides and chloride based accelerator admixtures c. 6% +/- 1-1/2% air-entrainment in conformance ASTM C94 d. Maximum slump of 5 inches +/- 1-1/2 inches per ASTM C143 for conventional concrete mix designs e. Slump Flow for Self-Consolidating Concrete (SCC) mix designs shall be between 18 inches and 32 inches as tested in accordance with ASTM C1611. 3. Each concrete block shall be cast in a single continuous pour without cold joints. With the exception of half-block units, corner units, and other special application units, the precast modular block units shall conform to the nominal dimensions listed in the table below and be produced to the dimensional tolerances shown. 4. The standard modules shall be 16”L x 6”H x 12”D with a maximum tolerance of plus or minus 1/8” for each dimension. 5. The coping modules shall be 24”L x 3”H x 12”D with a minimum tolerance of plus or minus 1/8” for each dimension. 6. The standard retaining wall modules shall be solid units and have a minimum weight of 45 lbs. per unit. 7. The concrete wall modules shall have an integral shear key connection that shall be offset to permit a minimum wall batter of 1H:8V. 8. The concrete wall modules shall have a minimum 28-day compressive strength of 35 MPa (5000 psi) as tested in accordance with ASTM C 140. The concrete shall have a maximum moisture absorption rate of 5 percent to ensure adequate freeze-thaw protection. 9. The block color shall be selected by the Owner from the available range of colors available from the precast modular block manufacturer. 10. Modular concrete retaining wall shall be Concord Wall XL as manufactured by Unilock, 35 Commerce Drive, Uxbridge, MA 01569, tel. (508) 278-4536, or approved equal. B. Retained Soil 1. The retained soil shall be on site soils meeting the requirements of select common fill, unless otherwise noted on Drawings or in specification. © 2018 CDM Smith 96538-221206 All Rights Reserved 3/16/2018 NPU DAF Improvements Concrete Segmental Retaining Wall 02851 - 6 D. Foundation Soil 1. The foundation soil shall be the native undisturbed inorganic granular soils. The foundation soil shall be examined and approval by the Wall Design Engineer prior to the placement of the base material. E. Leveling Base Material 1. Leveling base material shall be Structural Fill or crushed stone wrapped in filter fabric as specified in Section 02230 and approved by the Wall Design Engineer. Lean concrete may be used as leveling base material in accordance with the recommendation of the manufacturer and Wall Design Engineer. F. Concrete Adhesive 1. The adhesive is used to permanently secure the coping stone to the top course of the wall. The adhesive shall provide sufficient strength and remain flexible. Adhesive shall be Chem-Caulk 900 by Bostik or equal. Adhesive shall be approved by Wall manufacturer. G. Granular backfill (clear stone drainage layer) for drainage behind wall shall be screened gravel as required by manufacturer of modular concrete retaining wall. H. General backfill (compacted infill soil) material shall be structural fill or select common fill as specified in Section 02230. I. Geotextile filter fabric shall be as specified in Section 02230. PART 3 EXECUTION 3.01 SUBGRADE PREPARATION A. Subgrade under the wall shall be prepared in accordance with manufacturer's instructions and shall be excavated to the depth necessary to install the base material. B. If subgrade is judged to be weak, disturbed or otherwise unsuitable by the Engineer, the Contractor shall remove the unsuitable material and replace it with structural fill as specified in Section 02230. C. Over excavated areas shall be filled with compacted structural fill as specified in Section 02230. D. The base material shall be compacted to not less than 95% of modified proctor density. 3.02 WALL INSTALLATION TOLERANCES A. The following tolerances are the maximum allowable deviation from the planned construction, 1. Vertical Control: +/- 1.25 inches over a 10 ft distance, +/- 3 inches total 2. Horizontal Control: +/- 1.25 inches over a 10 ft distance, +/- 3 inches total © 2018 CDM Smith 96538-221206 All Rights Reserved 3/16/2018 NPU DAF Improvements Concrete Segmental Retaining Wall 02851 - 7 3. Rotation: +/- 2 degrees from planned wall batter 4. Bulging: 1.0 inch over a 10 ft distance 3.03 INSTALLING THE GEOTEXTILE A. The approved non-woven geotextile shall be set against the back of the first retaining wall unit, over the prepared foundation, and extend towards the back of the excavation, up the excavation base and back over the top of the drainage material to the retaining wall, or as shown on the Drawings. B. The remaining length of geotextile shall be pulled taut and pinned over the face of the retained soil. Geotextile overlaps shall be a minimum of 1 ft and shall be shingled down the face of the excavation in order to prevent the infiltration of retained soil into the drainage layer. 3.04 LEVELING BASE OR SPREAD FOOTING PLACEMENT A. The leveling base material shall be crushed stone compacted to 95% Modified Proctor Density, or vibrated concrete along the grades and dimensions shown on the Construction Drawings or as directed by the Engineer. The minimum thickness of the leveling base shall be 12 inches. 3.05 INSTALLATION OF MODULAR CONCRETE WALL UNITS A. The bottom row of retaining wall modules shall be placed on the prepared leveling base as shown on the Drawings. Care shall be taken to ensure that the wall modules are aligned properly, leveled from side to side and front to back and are in complete contact with the base material. B. The wall modules above the bottom course shall be placed such that the tongue and groove arrangement provides the design batter (i.e. setback) of the wall face. Successive courses shall be placed to create a running bond pattern with the edge of all units being approximately aligned with the middle of the unit in the course below it. C. The wall modules shall be swept clean before placing additional levels to ensure that no dirt, concrete or other foreign materials become lodged between successive lifts of the wall modules. D. A maximum of 3 courses of wall units shall be placed above the level of the drainage material at any time. E. The Contractor shall check the level of wall modules with each lift to ensure that no gaps are formed between successive lifts. F. Care shall be taken to ensure that the wall are not broken or damaged during handling and placement. G. Remove parts which are loose, chipped, broken, stained or otherwise damaged, and units which do not match adjoining units, and install new units as approved by Engineer, at no additional cost to the Owner. © 2018 CDM Smith 96538-221206 All Rights Reserved 3/16/2018 NPU DAF Improvements Concrete Segmental Retaining Wall 02851 - 8 3.06 BACKFILL A. The drainage soil will be placed behind the retaining wall modules with a minimum width of 1ft and separated from other soils using the approved non-woven geotextile. B. Drainage soil shall be placed behind the wall facing in maximum lifts of 6 inches and compacted to a minimum density of 95% Modified Proctor. C. Backfill behind the wall shall be structural fill or select common fill, placed and compacted in accordance with Section 02200. D. Backfill shall be brought up in conjunction with advancement of the wall. At no time shall wall installation advance more than 3 vertical courses prior to installation of the drainage system and supporting backfill material. E. No heavy compaction equipment shall be allowed within 3 ft of the back of the wall fascia. 3.07 MANUFACTURER'S REPRESENTATIVE A. A representative of the concrete modular unit manufacturer’s representative shall be present while subgrade is being prepared and wall is being installed. B. The manufacturer's representative(s) shall certify in writing that the wall has been properly installed in accordance with the manufacturer's recommendations. END OF SECTION