Engineering
Engineering
The Engineering Department is involved in the evaluation, design, and construction of the City's infrastructure and works collaboratively with other departments to fulfill comprehensive plans.
Construction Drawing Approval Process:
- Notes and Details to be placed on Construction Drawings:
- Helpful Hints and Information
The Engineering Department is involved in the evaluation, design, and construction of the city's infrastructure.
Construction Drawing Approval Process
Notes and details to be placed on construction drawings:
GENERAL
- ALL WORK (INCLUDING BUT NOT LIMITED TO CONSTRUCTION OF PRESSURIZED IRRIGATION, SEWER, WATER, STREETS, CURB GUTTER SIDEWALK, AND STREETLIGHTS) SHALL BE COMPLETED IN ACCORDANCE WITH THE LATEST EDITIONS OF THE KUNA STANDARD CONSTRUCTION SPECIFICATIONS, ADA COUNTY HIGHWAY DISTRICT SPECIFICATIONS, IDAHO STANDARDS FOR PUBLIC WORKS CONSTRUCTION, IDAHO STATE PLUMBING CODE, IDAHO STATE ELECTRICAL CODE, FEDERAL AND STATE LAWS.
- ALL WORK SHALL BE COMPLETED IN A PROFESSIONAL, HIGH-QUALITY MANNER. SUBSTANDARD, INCOMPLETE OR OTHERWISE DEFICIENT WORK SHALL BE REJECTED.
- CONTRACTOR SHALL REQUEST CITY OF KUNA INSPECTION OF PRESSURIZED IRRIGATION, SEWER, WATER LINES AND APPURTENANCES AT LEAST TWENTY-FOUR (24) HOURS BEFORE BACKFILLING.
- CONTRACTOR SHALL NOTIFY OWNER’S ENGINEER AND THE CITY OF KUNA FORTY-EIGHT (48) HOURS BEFORE INITIAL CONSTRUCTION BEGINS.
- CONTRACTOR SHALL NOTIFY THE CITY OF KUNA WHEN SHUTTING DOWN A JOB FOR ANY REASON AND PROVIDE 48 HOURS NOTICE BEFORE RESTARTING WORK.
- CONTRACTOR SHALL STAMP PI, S, OR W IN THE SIDEWALK OR CURB WHERE PRESSURIZED IRRIGATION, SEWER, OR WATER CROSS UNDER THE SIDEWALK OR CURB. WATER (W) STAMP SHALL BE IN LINE WITH THE WATER METER BOX.
- ALL POTABLE/NON-POTABLE WATER CROSSINGS SHALL BE CONSTRUCTED IN ACCORDANCE WITH ISPWC SD 407.
- ALL PIPE (PRESSURIZED IRRIGATION, SEWER & WATER) MAINS AND SERVICES, SHALL BE BEDDED WITH TYPE I OR TYPE III BEDDING. IN AREAS OF ROCK EXCAVATION, BEDDING BELOW THE BOTTOM OF PIPE SHALL BE AT LEAST SIX (6) INCHES THICK.
- CONTRACTOR(S) SHALL REMOVE ALL OBSTRUCTIONS, ABOVE AND BELOW GROUND, AS REQUIRED FOR THE CONSTRUCTION OF THE PROPOSED IMPROVEMENTS. THIS SHALL INCLUDE CLEARING ALL TREES, STUMPS, BRUSH, UNDERGROWTH, HEDGES, HEAVY GROWTH OF GRASS OR WEEDS, FENCE STRUCTURES, DEBRIS, RUBBISH AND MATERIALS WHICH, IN THE OPINION OF THE ENGINEER, ARE UNSUITABLE FOR THE FOUNDATION OF PAVEMENTS.
- ALL MATERIAL(S) NOT SUITABLE FOR FUTURE USE ON SITE SHALL BE DISPOSED OF OFF SITE IN ACCORDANCE WITH ALL FEDERAL, STATE, AND LOCAL REGULATIONS.
- CONTRACTOR SHALL LOCATE AND PROTECT CRITICAL CONSTRUCTION CONTROL POINTS WITHIN THE PROJECT WORK LIMITS.
- SURVEY CONTROL MONUMENTS SHALL BE PRESERVED, SET, AND/OR RESTORED IN ACCORDANCE WITH IDAHO CODE 50-1303.
- CONTRACTOR SHALL MAINTAIN ALL EXISTING DRAINAGE FACILITIES WITHIN THE CONSTRUCTION AREA UNTIL REPLACEMENT DRAINAGE FACILITIES ARE IN PLACE, FUNCTIONING, AND ACCEPTED BY ACHD OR CITY.
- ALL CONTRACTORS WORKING WITHIN THE PROJECT BOUNDARIES ARE RESPONSIBLE FOR COMPLIANCE WITH ALL APPLICABLE SAFETY LAWS OF ANY JURISDICTIONAL BODY. THE CONTRACTOR SHALL BE RESPONSIBLE FOR ALL BARRICADES, TRENCH SHORING, SAFETY DEVICES AND TRAFFIC CONTROL WITHIN AND AROUND THE CONSTRUCTION AREA.
- EXISTING A.C. PAVEMENT SHALL BE SAW CUT TO A NEAT, STRAIGHT LINE PARALLEL OR PERPENDICULAR TO THE STREET CENTERLINE AND THE EXPOSED EDGE SHALL BE TACKED WITH EMULSION BEFORE PAVING
- ALL MATERIALS MUST MEET THE MINIMUM REQUIREMENTS OF THE APPROVING AGENCIES OR AS SET FORTH HEREIN, WHICHEVER IS MORE RESTRICTIVE. ALL MATERIALS AND EQUIPMENT SHALL BE NEW.
- ALL CONTRACTORS WORKING WITHIN THE PUBLIC ROAD RIGHT-OF-WAY SHALL SECURE A RIGHT- OF-WAY PERMIT FROM ACHD AT LEAST 24 HOURS BEFORE ANY CONSTRUCTION.
- ALL COSTS OF RETESTING FAILED TESTS SHALL BE BORNE BY THE CONTRACTOR.
- ALL COSTS FOR CORRECTING DEFICIENT WORK SHALL BE BORNE BY THE CONTRACTOR. FAILURE TO CORRECT DEFECTIVE WORK WILL BE CAUSE FOR A STOP WORK ORDER.
- THE CONTRACTOR SHALL FIELD VERIFY ALL EXISTING CURBS, GUTTERS, STORM DRAINS, CHANNEL CROSSINGS AND SEWER ELEVATIONS OR INVERTS BEFORE BEGINNING CONSTRUCTION AND SHALL NOTIFY THE OWNER’S ENGINEER WHEN ELEVATIONS OR INVERTS DO NOT MATCH PROJECT DRAWINGS.
- THE LOCATIONS OF EXISTING UNDERGROUND UTILITIES ARE SHOWN IN APPROXIMATE LOCATIONS. THE CONTRACTOR SHALL DETERMINE THE EXACT LOCATION AND DEPTH OF ALL EXISTING UTILITIES BEFORE COMMENCING WORK. CONTRACTOR AGREES TO BE FULLY RESPONSIBLE FOR ANY AND ALL DAMAGES WHICH MIGHT BE OCCASIONED BY FAILURE TO EXACTLY LOCATE AND PRESERVE ANY AND ALL UNDERGROUND UTILITIES.
- EACH CONTRACTOR SHALL BE RESPONSIBLE FOR OBTAINING REQUIRED NPDES PERMITS, SUBMITTING NOTICE OF INTENT (NOI) TO DISCHARGE STORM WATER, AND PREPARING A POLLUTION PREVENTION PLAN (PPP) IN ACCORDANCE WITH ENVIRONMENTAL PROTECTION AGENCY (EPA) REGULATIONS. CONTACT THE EPA AT (208) 378-5746 FOR REQUIRED INFORMATION. STORM WATER PERMIT SHALL BE PRESENTED TO THE ENGINEER AT LEAST 48 HOURS BEFORE BEGINNING CONSTRUCTION.
- ALL UTILITIES, INCLUDING SERVICE LINES, WITHIN STREET TRAVEL WAYS SHALL BE IN PLACE, TESTED AND FULLY FUNCTIONAL, PRIOR TO CURB, GUTTER, SIDEWALK AND STREET CONSTRUCTION.
- PAVEMENT AND CONCRETE REMOVED OR DAMAGED DURING CONSTRUCTION SHALL BE REPLACED WITHIN SEVEN (7) CALENDAR DAYS FROM THE TIME THE PAVEMENT AND/OR CONCRETE IS REMOVED PER ISPWC AND ACHD STANDARDS.
- PAVING SHALL NOT PROCEED UNTIL THE CONTRACTOR OBTAINS WRITTEN APPROVAL OF ALL INSTALLED WATER, SEWER, AND PRESSURE IRRIGATION FACILITIES FROM THE CITY OF KUNA.
- ALL ROCK BLASTING SHALL OCCUR BEFORE INSTALLING SEWER MAINS, WATER MAINS, PRESSURE IRRIGATION MAINS OR SERVICE LINE CROSSINGS. BLASTING IN THE PROXIMITY OF EXISTING UTILITIES MAY BE PERFORMED AS LONG AS THE HORIZONTAL DISTANCE FROM THE EXISTING UTILITY IS EQUAL TO OR GREATER THAN THE EXCAVATION DEPTH FROM THE EXISTING UTILITY OR FIFTEEN (15) FEET, WHICHEVER IS GREATER. THE BLASTING CONTRACTOR SHALL BE RESPONSIBLE FOR ANY/ALL DAMAGE TO ANY/ALL EXISTING UTILITIES.
- THE DEVELOPER SHALL RETAIN AN IDAHO REGISTERED PROFESSIONAL ENGINEER TO PERFORM INSPECTION SERVICES DURING CONSTRUCTION. THE ENGINEER SHALL PROVIDE A WRITTEN CERTIFICATION LETTER TO THE CITY OF KUNA THAT THE PROJECT WAS COMPLETED IN ACCORDANCE WITH THE APPROVED PLANS AND SPECIFICATIONS. COPIES OF ALL AIR TESTS, DEFLECTION TESTS, PRESSURE TESTS, AND BACTERIOLOGICAL TEST RESULTS SHALL BE FURNISHED WITH THE CERTIFICATION LETTER.
- THE CITY OF KUNA WILL PROVIDE PERIODIC INSPECTION AND OBSERVE TESTING FOR AN EIGHT (8) HOUR DAY, FROM 7:30 A.M. TO 3:30 P.M., FOR A FORTY (40) HOUR WORK WEEK. CONTRACTOR SHALL REIMBURSE THE CITY AT RATES ESTABLISHED BY THE CITY FOR INSPECTIONS EXCEEDING THE NORMAL WORK WEEK, INCLUDING LEGAL HOLIDAYS. OVERTIME INSPECTION RATES AND A LIST OF LEGAL HOLIDAYS AND A REQUEST FOR INSPECTION OUTSIDE STANDARD CITY BUSINESS HOURS FORM CAN BE OBTAINED FROM THE CITY PUBLIC WORKS DEPARTMENT.
- WHEN CONSTRUCTION IS SATISFACTORILY COMPLETED, CLEANED AND TESTED AND AFTER ALL OTHER UTILITIES ARE INSTALLED THE DEVELOPER SHALL REQUEST A CITY OF KUNA FINAL ACCEPTANCE INSPECTION. AT A MINIMUM, THE FINAL ACCEPTANCE INSPECTION SHALL INCLUDE:
- CLEAN ALL SEWER MAINLINES b. DEFLECTION TEST SEWER MAINLINE
- DEFLECTION TEST SEWER MAINLINE
- VISUALLY INSPECT EACH MANHOLE
- WITNESS SEWER MAINLINE AIR PRESSURE TEST
- WITNESS WATER MAINLINE PRESSURE TEST
- WITNESS PRESSURE IRRIGATION PRESSURE TEST
- CLEAN AND TELEVISE ALL SEWER MAIN LINES
- VISUAL INSPECTION OF THE SEWER MAINS
- PROVIDE A DVD OF ALL SEWER MAIN VISUAL INSPECTION
- ALL TESTING SHALL BE PROVIDED AND PAID FOR BY THE DEVELOPER
- CITY HAS THE RIGHT TO INSPECT THE WORK AT ANY TIME DURING CONSTRUCTION. ANY WORK NOT CONFORMING TO THE APPROVED PLANS AND SPECIFICATIONS SHALL BE REJECTED.
- THE DEVELOPER SHALL GUARANTEE ALL WORK FOR A PERIOD OF ONE YEAR FOLLOWING ACCEPTANCE BY THE CITY. THIS GUARANTEE SHALL COVER ALL DAMAGE, MATERIALS, LABOR, AND WORKMANSHIP.
- DEVELOPER SHALL NOTIFY ALL PURCHASERS OF LOTS, AND THEIR CONTRACTORS, THAT CITY UTILITY SYSTEMS HAVE BEEN ACCEPTED BY THE CITY. ANY DAMAGE TO THESE SYSTEMS DURING HOME CONSTRUCTION SHALL BE BILLED DIRECTLY TO THE OWNER OF RECORD WHEN THE DAMAGE IS FOUND.
- THE DEVELOPER SHALL PROVIDE RECORD DRAWINGS.: ONE (1) SET OF ELECTRONIC DRAWINGS ON CD OR THUMB DRIVE IN PDF FORMAT, AND TWO (2) 24” X 36” SETS ON WHITE PAPER BEFORE FINAL PLAT OR WITHIN 30 DAYS OF FINAL ACCEPTANCE.
- WHEN HDPE IS APPROVED BY THE CITY ENGINEER OR DESIGNEE AS AN ALTERNATIVE MATERIAL, THE INTERIOR BEADING AT FUSION WELDS SHALL BE REMOVED.
- PIPE PROFILES SHALL HAVE A MINIMUM SCALE OF 1” = 10’ AND MAXIMUM SCALE OF 1” = 40’ UNLESS OTHERWISE APPROVED BY THE CITY ENGINEER OR ITS DESIGNEE.
IRRIGATION
- THE DEVELOPER SHALL NOTIFY ALL LOT PURCHASERS THAT THERE MUST BE NO INTERCONNECTION BETWEEN THE PRESSURE IRRIGATION SYSTEM AND HOUSE PLUMBING. OUTSIDE HOUSE FAUCETS MUST ONLY BE CONNECTED TO THE MUNICIPAL POTABLE WATER SYSTEM THROUGH THE HOUSE SERVICE CONNECTION.
- INSTALL PRESSURE IRRIGATION SYSTEMS CONSISTING OF IRRIGATION MAINS AND INDIVIDUAL SERVICE CONNECTIONS TO EACH LOT.
- MAINTAIN PRESSURE IRRIGATION CIRCUITS AS SHOWN ON THE APPROVED CONSTRUCTION PLANS. DO NOT JUMP ACROSS FROM ONE CIRCUIT TO ANOTHER. CONTRACTOR IS RESPONSIBLE FOR ALL COSTS TO CORRECT CROSS CONNECTIONS WHEN DISCOVERED.
- CONNECTION TO THE CITY OF KUNA MUNICIPAL WATER (POTABLE) SYSTEM FOR IRRIGATION PURPOSES IS NOT ALLOWED.
- LOT SERVICE REQUIREMENTS: LOT SIZE S.F. 0-14,000 14,000 - 26,000 26,000+ IRRIGATION RISERS ONE 1” TWO 1” OR ONE 1.5” DETERMINED BY CITY ENGINEER OR DESIGNEE
- ALL IRRIGATION MAINLINES SHALL BE INSTALLED SUCH THAT AIR AUTOMATICALLY VENTS DURING FILLING AND DRAINING. AUTOMATIC AIR/VACUUM RELIEF VALVES SHALL BE INSTALLED AT ALL HIGH POINTS IN THE SYSTEM AND IN LOCATIONS DETERMINED BY THE CITY ENGINEER. IN LIEU OF AUTOMATIC VENTS, THE CONTRACTOR MAY INSTALL SERVICES WITH THE TAP ON TOP OF THE MAIN AT THE HIGH POINT WITH THE SERVICE LINE LAID LEVEL OR RISING TO THE SERVICE BOX.
- ALL IRRIGATION MAINS SHALL FREELY DRAIN. “FREELY DRAIN” MEANS TO DRAIN BY GRAVITY INTO A DRAINAGE SWALE, DRAINAGE POND, DRAINAGE DITCH OR ADEQUATELY SIZED DRY WELL. THE DRAIN SYSTEM SHALL INCLUDE MANUALLY OPERATED VALVES AS DETAILED IN CITY OF KUNA STANDARD DETAILS. LOCATE DRAINS IN COMMON AREAS, ALONG PATHWAYS OR STREET FRONTAGES UNLESS SPECIFICALLY APPROVED OTHERWISE BY THE CITY ENGINEER.
- PIPE DEPTH: ALL IRRIGATION MAIN LINES NOT WITHIN ROAD RIGHT OF WAY (ROW) SHALL HAVE AT LEAST THREE (3) FEET OF APPROVED COVER MATERIAL MEASURED FROM FINISH GRADE TO CROWN OF PIPE IF THE PIPE IS FREE DRAINING. A MINIMUM OF FOUR (4) FEET OF COVER SHALL BE REQUIRED FROM FINISH GRADE TO CROWN OF PIPE UNDER ROADWAYS AND WHERE PIPE IS NOT FREE-DRAINING. NO IRRIGATION MAIN LINE PIPING SHALL BE COVERED WITH MORE THAN SIX (6) FEET OF APPROVED COVER MATERIAL.
- PRESSURE IRRIGATION MAIN LINE PIPING 4 INCH DIAMETER AND LARGER SHALL BE CONSTRUCTED OF POLYVINYL CHLORIDE (PVC), DR21 (200 PSI), CONFORMING TO ASTM D2241.
- PRESSURE IRRIGATION MAIN LINE PIPING IN THE R.O.W. AND PARALLEL TO CENTER LINE SHALL BE PVC, C900 DR 18.
- SLEEVE PRESSURE IRRIGATION SERVICE LINES IN A FOUR (4) INCH DIAMETER C900 DR 18 OR SCH 80 WATER CLASS PIPE WHEREVER THE SERVICE LINE CROSSES A STREET DRAINAGE SEEPAGE BED.
- ALL PI SLEEVING SHALL INCLUDE CALPICO SEALS.
- 4 INCH DIAMETER AND LARGER PIPE SHALL HAVE RUBBER GASKETED JOINTS.
- PRESSURE IRRIGATION PIPE SHALL BE CLEARLY MARKED WITH TYPE, CLASS OR THICKNESS. LETTERING SHALL BE LEGIBLE AND PERMANENT.
- PLACE MARKING TAPE ABOVE ALL IRRIGATION PIPE BETWEEN SIX (6) INCHES BELOW GROUND SURFACE AND SIXTEEN (16) INCHES ABOVE TOP OF PIPE. TAPE SHALL BE THREE (3) INCHES WIDE, 4 MIL POLYETHYLENE, PURPLE IN COLOR, WITH “PRESSURIZED IRRIGATION MAINLINE” CLEARLY MARKED ALONG THE LENGTH OF THE TAPE IN 1 ½” BLACK LETTERS.
- TAPE A #12 DIRECT BURIAL TRACER WIRE ALONG THE CROWN OF THE PRESSURE IRRIGATION MAINLINE. LOOP THE TRACER WIRE FROM THE MAINLINE TO EACH SERVICE BOX AND BACK TO THE MAINLINE. THE TRACER WIRE SHALL BE ACCESSIBLE AT ALL VALVE BOXES AND EXTENDED ALONG THE OUTSIDE OF THE LOWER PORTION AND ALONG THE INSIDE OF THE UPPER PORTION OF THE VALVE BOX. CONDUCT AN ELECTRICAL CONTINUITY TEST BEFORE PAVING TO VERIFY TRACER WIRE INTEGRITY.
- EQUIP EACH PRESSURE IRRIGATION SERVICE WITH A METAL OR PLASTIC TAG (YUCKY FACE) “NON-POTABLE WATER-DO NOT DRINK”.
- VALVES 4 INCH DIAMETER AND LARGER SHALL BE RESILIENT WEDGE GATE VALVES CONFORMING TO THE REQUIREMENTS OF ANSI/AWWA C5O9, WITH MECHANICAL OR FLANGED JOINTS AND 2 INCH SQUARE OPERATING NUT. ACCEPTABLE VALVES ARE MUELLER MODEL A-2360 AND A-2361 OR CLOW MODEL 2639 AND 2640. ALTERNATE VALVES MUST BE SPECIFICALLY APPROVED BY THE CITY ENGINEER. VALVE BOXES FOR VALVES 4 INCH DIAMETER AND LARGER SHALL BE STANDARD CAST IRON 5 1/4 INCH DIAMETER ADJUSTABLE VALVE BOX.
- VALVES FOR STREET CROSSINGS SHALL BE PLACED WITHIN 2 FEET OF THE BACK EDGE OF SIDEWALK.
- FITTINGS SHALL BE CAST IRON, DUCTILE IRON, PVC, BRASS OR STAINLESS STEEL, AND SHALL HAVE A MINIMUM PRESSURE RATING EQUAL TO OR GREATER THAN 200 PSI. ALL FITTINGS FOUR (4) INCHES AND LARGER SHALL BE DUCTILE IRON WITH FLANGED OR MECHANICAL JOINTS. THRUST BLOCKS OR OTHER CITY ENGINEER APPROVED RESTRAINTS SHALL BE PROVIDED AT CHANGES OF DIRECTION.
- IRRIGATION SYSTEMS SHALL BE PRESSURE TESTED IN ACCORDANCE WITH ISPWC SPECIFICATIONS FOLLOWING INSTALLATION OF ALL OTHER UTILITIES AND BEFORE PAVING. TESTING SHALL BE OBSERVED BY A CITY REPRESENTATIVE.
SEWER
- ABANDON ALL EXISTING SEPTIC SYSTEMS IN ACCORDANCE WITH IDAHO DEPARTMENT OF ENVIRONMENTAL QUALITY REQUIREMENTS. PROVIDE DOCUMENTATION TO THE CITY OF KUNA UPON REQUEST.
- THE HORIZONTAL SEPARATION OF POTABLE WATER AND SEWER MAINS SHALL BE A MINIMUM OF TEN (10) FEET FROM PIPE EDGE TO PIPE EDGE AS SHOWN IN ISPWC SD 407.
- GROUNDWATER LEVELS SHALL BE MAINTAINED BELOW THE BOTTOM OF THE TRENCH DURING PIPE LAYING AND JOINING OPERATIONS.
- TRENCH BACKFILL ABOVE THE PIPE ZONE SHALL BE INSPECTED BY ACHD OR BY THE OWNER’S ENGINEER IN ACCORDANCE WITH THE LATEST EDITION OF THE “CONSTRUCTION QUALITY ASSURANCE MANUAL”. COMPACTION TESTS ARE REQUIRED IN THE BACKFILL ABOVE THE PIPE ZONE, WITHIN PUBLIC RIGHT-OF-WAY, ACCORDING TO ACHD REQUIREMENTS. SUBMIT DENSITY TEST RESULTS TO THE CITY OF KUNA AND ACHD BEFORE FINAL ACCEPTANCE.
- CONTRACTOR SHALL LEAVE THE EXCAVATION FOR THE UPSTREAM END OF ALL SERVICE LINES OPEN TO ALLOW ON SITE VERIFICATION OF THE INVERT ELEVATIONS AND SLOPES BY THE CITY’S INSPECTOR. CONTRACTOR SHALL NOT BACKFILL THE ENDS OF SERVICE LINES UNTIL APPROVED BY THE CITY OF KUNA INSPECTOR OR OTHER ARRANGEMENTS HAVE BEEN MADE FOR THE VERIFICATION OF SERVICE LINE INVERT ELEVATIONS AND SLOPES.
- CONTRACTOR SHALL INSTALL A REMOVABLE PLUG IN THE DOWN STREAM SIDE OF THE EXISTING MANHOLE WHERE THE NEW CONNECTION WILL BE MADE. THE PLUG SHALL REMAIN IN PLACE UNTIL FINAL ACCEPTANCE OF THE SEWER PROJECT.
- ALL SEWER PIPE AND FITTINGS 4 INCH THROUGH 15 INCH DIAMETER SHALL BE POLYVINYL CHLORIDE (PVC) CONFORMING TO ASTM D-3034, SDR-35. SEWER PIPE AND FITTINGS SIZES 18 INCH THROUGH 36 INCH DIAMETER SHALL BE PVC CONFORMING TO ASTM F 679. PRESSURE SEWER PIPE SHALL CONFORM TO AWWA C900 PVC, DR 18 (235 PSI).
- SEWER SERVICE LINES SHALL BE INSTALLED BEFORE STREET IMPROVEMENTS & SEWER SERVICE MARKERS SHALL BE IN PLACE BEFORE FINAL INSPECTION. CONTRACTOR SHALL NOTIFY THE CITY WHEN SEWER SERVICE STUB OUTS ARE INSTALLED, MARKED & READY FOR INSPECTION.
- PLACE MARKING TAPE ABOVE ALL FORCE MAIN SEWER PIPE BETWEEN SIX (6) INCHES BELOW GROUND SURFACE AND SIXTEEN (16) INCHES ABOVE TOP OF PIPE. TAPE SHALL BE THREE (3) INCHES WIDE, 4 MIL POLYETHYLENE, GREEN IN COLOR, WITH “SEWER PIPE” CLEARLY MARKED ALONG THE LENGTH OF THE TAPE IN 1 ½” BLACK LETTERS.
- SLEEVE SEWER SERVICE LINES IN A MINIMUM OF SIX (6) INCH DIAMETER C900 DR 18 OR SCH 80 PIPE WHEREVER THE SERVICE LINE CROSSES A STREET DRAINAGE SEEPAGE BED. SLEEVE SHALL BE ADEQUATELY SIZED TO PROVIDE SPACE FOR THE OUTSIDE DIAMETER OF BELL JOINTS AND SHALL MEET ACHD REQUIREMENTS.
- CONSTRUCT ALL MANHOLES WATER TIGHT. THE TOP OF MANHOLE CONE SHALL BE WITHIN TWELVE (12) INCHES OF FINISHED GRADE. CONTRACTOR SHALL SUPPLY ALL LID ASSEMBLIES AND GRADE RINGS.
- SEWER CONSTRUCTION SHALL MEET THE SPECIFIC DETAILS AND REQUIREMENTS OF THE FOLLOWING STANDARD DRAWINGS AND ACCOMPANYING SPECIFICATIONS FOUND IN “IDAHO STANDARDS FOR PUBLIC WORKS CONSTRUCTION” AND ACHD STANDARD DRAWINGS:
- STANDARD MANHOLE – TYPE A, DRAWING NO. SD-501 AND SD-501A.
- STANDARD SHALLOW MANHOLE – DRAWING NO. SD-505.
- MANHOLE COLLAR DETAIL – DRAWING NO. SD-508.
- MANHOLE COVER AND FRAME – DRAWING NO. SD-507.
- STANDARD SEWER SERVICE LINE – DRAWING NO. SD-511 & SD-511A.
- SEWER SERVICE MARKER – DRAWING NO. SD-512.
- CONTRACTOR SHALL FIELD VERIFY THE TOP ELEVATION OF MANHOLE CONES TO ENSURE THAT ALL RING ELEVATIONS MATCH FINAL STREET GRADES.
- MANHOLE: APPLY NON-SHRINK GROUT BETWEEN THE METAL FRAME AND GRADE RINGS. GRADE RINGS SHALL NOT BE STACKED WITHOUT NON-SHRINK GROUT OR MORTAR.
- SET EACH GRADE RING IN A BED OF NON-SHRINK GROUT OR MORTAR. TROWEL SMOOTH WITH THE INSIDE OF THE MANHOLE.
- PAVING CONTRACTOR SHALL SET THE GRADE RINGS AND POUR THE CONCRETE COLLARS PER ISPWC DRAWING NO. SD-508. THE PAVING CONTRACTOR SHALL CONTACT ACHD 24 HOURS PRIOR TO POURING CONCRETE COLLARS.
- PRIOR TO CONNECTING TO THE EXISTING SEWER SYSTEM, WHERE THE CONNECTION IS MADE BETWEEN MANHOLES AND EXISTING SERVICES, ALL SEWER MAINS AND SERVICES MUST BE AIR TESTED.
- COMPLETE INTEGRITY TESTING, AFTER ALL UTILITIES ARE INSTALLED AND BEFORE PAVING.
- CONTRACTOR SHALL CONTACT OWNERS’ ENGINEER AND THE CITY OF KUNA AT LEAST 24 HOURS BEFORE TESTING. SEWER LINES SHALL BE TESTED IN ACCORDANCE WITH DIVISION 500 OF THE ISPWC SPECIFICATIONS. A CITY REPRESENTATIVE MUST OBSERVE THE TESTING. TESTING SHALL INCLUDE AIR PRESSURE TESTING, DEFLECTION TESTING, INVERT ELEVATION SURVEY AND VISUAL INSPECTION USING A CLOSED-CIRCUIT TELEVISION (CCTV) CAMERA. ALL SEWER LINES SHALL BE CLEANED AND CHECKED FOR DEFLECTION BEFORE BEGINNING THE CCTV CAMERA INSPECTION. PROVIDE A COPY (DVD or THUMB) OF THE VISUAL INSPECTION TO THE CITY OF KUNA FOR QUALITY VERIFICATION. NO SEWER MAINLINE SHALL BE CONSIDERED APPROVED AND ACCEPTED UNTIL THE VISUAL REVIEW IS COMPLETE.
- SEWER CONSTRUCTION INSPECTIONS WILL BE PERFORMED BY THE OWNER’S ENGINEER OR DESIGNATED REPRESENTATIVE. SUCH APPROVAL SHALL NOT RELIEVE THE CONTRACTOR FROM THE RESPONSIBILITY OF PERFORMING THE WORK IN AN ACCEPTABLE MANNER, IN CONFORMANCE WITH THE APPROVED MASTER PLAN, CONTRACT DRAWINGS, AND ASSOCIATED SPECIFICATIONS.
- CITY OF KUNA SHALL PROVIDE FINAL APPROVAL AND ACCEPTANCE OF ALL SEWER CONSTRUCTION.
WATER
- All existing wells shall be abandoned in accordance with Idaho Department of Water Resources requirements. Contact IDWR 208-334-2190.
- Contractor shall maintain continuous water service to all existing water users affected by construction.
- Contractor shall prevent the entry of animals, dirt and other foreign matter into pipes and shall not leave any open pipe end at any time when absent from the work site.
- All water main line pipe shall be PVC conforming to AWWA C-900 DR 18 (235 psi) or Class 152 cement mortar lined Ductile Iron conforming to AWWA C-152. All Fittings shall be Ductile Iron conforming to AWWA C-110.
- All water main line pipe, and services shall be bedded with type I or type III bedding. In areas of rock excavation, pipe bedding shall be at least six (6) inches thick measured from the pipe bell.
- All water main pipe shall be covered with at least four (4) feet and no more than six (6) feet of approved fill material. Fill shall be measured from finished grade to top of pipe.
- Compact trench backfill to 95% of ASTM D 698 (minimum).
- Place marking tape above all water pipe between six (6) inches below ground surface and sixteen (16) inches above top of pipe. Tape shall be three (3) inches wide, 4 mil polyethylene, blue in color, with “water pipe” clearly marked along the length of the tape in 1 ½” black letters.
- Tape no. 12 direct burial tracer wire to the crown of water main pipe and service lines. Loop the tracer wire from the main line to each service vault along the service pipe and back to the main line. The tracer wire shall be accessible at all valve boxes and shall be extended along the outside of the lower portion and along the inside of the upper portion of the valve box. Wire shall be taped to gate Valves so it is accessible from above without interfering with valve operation. Conduct an electrical continuity verification test before paving.
- All main line water Valves shall be resilient wedge gate Valves conforming to ANSI/AWWA C-509. Acceptable Valves are Mueller model A-2360 and A-2361 or Clow model 2639 and 2640. Other water Valves must be approved by the city engineer.
- Furnish all water Valves with a standard cast iron 5-1/4 inch diameter 3- piece adjustable valve box. The cast iron cover shall be designed to slip inside the top bell, marked with the word “water” as an integral part of the cover. A concrete collar shall be required when located in pavement.
- All tees, plugs, bends, and other locations where unbalanced forces exist, shall be secured and anchored by suitable thrust blocking as shown on ISPWC SD-403.
- Tees, bends, and other water connection Fittings shall be Ductile Iron.
- Air release Valves shall be AVTEK model 5301 or ARI D-040.
- Sleeve water service lines in a four (4) inch diameter C900 DR 18 or SCH 80 water class pipe wherever the service line crosses a street drainage seepage bed. Sleeve shall be adequately sized to provide space for the outside diameter of bell joints and shall meet ACHD requirements.
- Open each meter setter and verify that the corporation stop is open and the service is operable before paving.
- Operate each valve and fire hydrant to ensure proper function before paving. A City of Kuna representative shall observe all testing.
- Leak-test, flush and disinfect all water main lines after installation of all utilities, before connecting to the water distribution system, and before paving. Pressure test the distribution system per ISPWC Section 401.
- The contractor may pressure test all water lines after disinfection and flushing but before installation of other utilities. After all utilities are installed and prior to paving the contractor shall perform a final pressure test with city personnel in attendance. The contractor shall furnish all personnel and equipment necessary to conduct the test.
- Disinfect and flush water mainlines according to ISPWC Division 400. The disinfection and final flushing shall be tested to determine if the appropriate minimum chlorine residuals have been met.
- Sample and test all water lines for bacterial coliforms. All water lines shall pass the required bacteriological test before being put into service.
- Contractor shall provide bacterial test reports from a certified laboratory showing that the water lines have passed bacteria safety requirements. A City of Kuna representative shall observe the sample event.
- Locate Valves, flanged or M.J., in the street unless explicitly approved by the city engineer. Set all gate Valves as close (flange connected) as possible to water main line Fittings.
- Contractor shall field verify all valve box lid elevations to ensure that lid elevations match final street grade, and all meter lid elevations match sidewalk elevations.
- Locate all water meters and fire hydrants out of the road right-of-way. Provide at least one (1) foot separation between back of sidewalk (or curb if no sidewalk) and the leading edge of any fire hydrant.
- The contractor shall locate and mark all existing service connections with an 8 foot 2” x 4” board or metal t post painted blue.
- Paving contractor shall set water valve risers in concrete collars per ISPWC standard drawing SD-406.
- All fire hydrants shall be dry barrel conforming to AWWA C-5o2, installed per ISPWC section 403 and ISPWC DWG SD-404. Fire hydrants shall have a five (5) foot setting minimum, 150 psi working pressure, one 4-1/2 inch diameter national standard pumper nozzle equipped with Storz fitting, and two 2-1/2 inch diameter national standard thread fire hose nozzles. The valve operator shall open counter clockwise. The hydrant shall be equipped with a drain that opens when the hydrant is closed; and a six (6) inch flanged by mechanical joint resilient wedge gate valve attached directly to the water main line tee. Alpha restraint allowed.
- Fire hydrants shall be Clow Medallion, Waterous Pacer 100, or Mueller A423. No others will be accepted. Maximum hydrant spacing shall be 500 feet. Hydrant locations shall be approved in writing by the Kuna Rural Fire Department and submitted with the construction plans for final review and approval by the city engineer.
- Install individual one (1)-inch water services for each connection from a single or dual meter vault. Extend the one (1)-inch water service for each connection at least 10-feet on the house side of the meter, or as required to extend past other utilities located within the 10-foot utility easement. Details shall be as noted in ISPWC DWG SD-401.
- The City of Kuna shall furnish and install water meters.
- Contractor shall provide each water service leg with 18-inch tall ¾-inch copper meter setter, curb stop, lockable shutoff valve and check valve, 20- inch diameter by 36-inch tall insulated meter box as manufactured by “mid- states plastics, inc.” With 20” x 1” foam insulation pads and a cast iron frame and cover tapped with a 1-inch diameter recessed hole for the city autoread meter sensor as approved by the city.
- Meter boxes shall be located on the north or east side of the property, or in case of dual water service, on the north or east side of the common property lot line.
- The centerline of the meter setter shall be located 18-inches below finish grade. Meters shall be placed 18-inches inside the property line and 18-inches away from the side lot line.
- Multiple taps in the same pipe joint shall be staggered and shall be separated by a minimum of one and a half (1 ½) feet or as listed in the pipe manufacturers recommendations, whichever is greater.