SEWER STANDARDS SECTION 2 SECTION TWO - SEWER STANDARDS CITY OF ELLENSBURG

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1 SECTION 2 SEWER STANDARDS 1

2 Description SECTION TWO TABLE OF CONTENTS Page SEWER MAIN EXTENSIONS GENERAL INTRODUCTION STANDARDS AND CONDITIONS SPECIFICATIONS EXTENSIONS GENERAL GRAVITY SEWER PIPE PVC PIPE: METHODS OF CONSTRUCTION PIPE LAYING REPAIR OF NEWLY CONSTRUCTED PVC SEWER MAINS WATER MAIN CROSSING PRESSURE SEWER PIPE PRESSURE SEWER MAINS JOINTS ALIGNMENT & GRADE TOLERANCE TRENCH EXCAVATION SHORING TUNNELING JACKING OR BORING - ROADWAY CROSSINGS PIPE BEDDING FOUNDATION GRAVEL MANHOLES INSTALLATION STAKING CLEANING AND FLUSHING TESTING OF GRAVITY SEWERS TESTING OF PRESSURE SEWER MAINS SIDE SEWERS SEWER CONNECTION INSPECTIONS SEPTIC TANKS PUMP STATIONS TELEVISION INSPECTION TYPICAL BUILDING SEWER CONNECTION: MATERIALS ALLOWED GENERAL REQUIREMENTS DOMESTIC SEWER, STORM and WATER MAIN EXT. RECORD DRAWINGS AGREEMENT FOR EXTENSION OF ELLENSBURG INFRASTRUCTURE: SEWER COMPREHENSIVE PLAN DRAWINGS:

3 SEWER MAIN EXTENSIONS GENERAL INTRODUCTION: The items herein contained are the sewerage system standards, conditions, and specifications of the City of Ellensburg. These are minimums only and may be increased or altered to fit particular situations. Any material, design, standard, or testing not specifically addressed within this document shall be as per the current edition of Washington State Department of Transportation Standard Specifications for Road, Bridge, and Municipal Construction and/or Washington State D.O.E. Criteria for Sewage Works Design which are hereby adopted by this reference as if fully set forth herein. STANDARDS AND CONDITIONS: A. When extension of the existing sewer system is required for service, an Agreement for Extension of Ellensburg Infrastructure shall be entered into between the Developer and the City, substantially in the form which is included at the end of this Section. B. To initiate the Developer Extension process the Developer shall submit a sewer plan prepared by a Professional Civil engineer licensed in the State of Washington. Plan/Profile drawing shall be produced on mylar copy and electronic drawing in current City drawing format, refer to the drafting section for current City formatting. C. The licensed professional civil engineer shall certify that the design and construction of the sewerage collection system meets or exceeds all applicable standards. D. Obtaining necessary permits will be the responsibility of the Developer. E. Where franchises, easements or deeds to property are required it shall be the responsibility of the Developer to provide same and submit appropriate documentation to the City. F. Easements shall be as per the Misc. Section of these Development Standards. Access to and through easements need to be considered during the design process. G. The Developer is required to supply insurance and bonding information per the requirements of the Bonding and Insurance Section of these Development Standards H. Connection between the City's existing system and the new sewerage collection system shall be made by the Developer at the expense of the Developer. 3

4 I. All main lines must be designed to provide for proper collection of sewerage from all lands served by the development. Extensions shall be required through and to the extremes of the property for future service unless the City determines otherwise. Refer to note N on this Standards and Conditions Section of these Development Standards. J. The minimum size sewer main permitted shall be eight inch (8 ) diameter. K. Pressure and leakage testing shall be accomplished as per specifications contained herein before final acceptance. L. Final acceptance shall not constitute acceptance of any unauthorized or defective work or material. The City shall not be barred from requiring the developer to reimburse the City for the removal, adjustment, replacement, repair or disposal of any unauthorized or defective work or material or from recovering costs for any such work or material in accordance with the bond and insurance requirements set forth in the Bonding and Insurance Section of these Development Standards. M. Sewer hook-ups shall be made by the lot owner. Sewer service shall not begin prior to payment of all applicable hook-up fees. Side sewer taps on existing mains shall be performed by City at the Developers expense. N. For existing platted lots, the City may enter into latecomer agreements with Developers, prior to installation of sewer mains and appurtenances, in order to provide for the reimbursement to Developers of a pro-rata share of the cost of construction by the sewer service users of any real estate who have not contributed to the original cost of such facilities and who subsequently connect to the sewerage collection system, pursuant to the Ellensburg City Code as now exists or as may be hereafter amended. O. Pretreatment is required for various activities such as restaurants, gas stations and industrial activities. The pretreatment mechanisms shall be engineered and presented to the City for approval. Complete pretreatment requirements are addressed in the City s Municipal Sewer Code. P. Any sewer line that is constructed with more than one (1) side sewer attached shall be considered to be a public main and shall be subject to the requirements and standards of main construction. Q. The Developer shall supply a certified "Record Drawing" meeting all standards established on the Domestic Sewer Main Extension Record Drawing sheet located at the end of this Section, and meeting the requirements set forth in the Drafting Section of these Development Standards. 4

5 SPECIFICATIONS EXTENSIONS: All extensions to the Sewer System shall conform to the design standards of the City as set forth herein. The system must be capable of future expansion if required and be constructed of permanent materials. Sewer main extensions shall be in accordance with the City s sewer system comprehensive plan. In cases where larger mains are required, developer may request payment from the City for the costs of oversizing the main. Costs must be prepared by a licensed professional engineer, and the request must be submitted in writing and approved by the City Council prior to commencing work. The Developer may be required to perform main or service extensions to properties that are adjacent to the improvements which will then benefit from the main or service extension. In these cases, the Developer will be required to supply the City with a reasonable cost (material and labor) to perform the work. In determining such cost, the Developer will be required to pay their employees per the requirements of Labor and Industries (prevailing wages) for the additional work required to install service to those adjacent properties not included in their proposal. Upon completion of the work, and receipt of the appropriate L&I documentation, the City will reimburse the Developer for the work. The following are required: 1. Plans and Specifications. The installation of sewer extensions shall be in accordance with construction plans and specifications approved by the City. 2. Sewer mains shall be P.V.C. or ductile iron. City may approve HDPE pipe in certain circumstances, such as boring. City shall approve type. 3. Manholes shall be precast, 48" I.D. and shall generally conform to A.S.T.M. specification for equivalent size reinforced concrete sewer pipe. Outside drop structures shall be constructed of ductile iron or P.V.C. pipe. Inside drop structures are not allowed. 4. Pressure mains shall be ductile iron, P.V.C., or H.D.P.E. 5. All joints for sewers or pressure mains shall be of the rubber gasket type, unless fusion style is approved. 6. Pipe sizes shall be selected as required by standard engineering practice and shall conform to the overall sewerage plan of the City. 7. Minimum depth of sewer main and side sewer stubs in rights-of-way shall be four (4) feet over the top of pipe. 5

6 8. The sewer grades shall be sufficient to maintain a velocity of 2 feet per second at design flow. Minimum grade shall be one-half of one percent (0.005 ft./ft.) for 8" diameter pipe, 0.01 for 6" diameter pipe and 10 and larger shall be in accordance with the Washington State DOE "Criteria for Sewage Works Design". 9. Manhole covers shall be Olympic Foundry MH 30 or approved equivalent. See Standard Details included at the end of this Section GENERAL GRAVITY SEWER MAIN : 1. All material shall be new and undamaged. Unless otherwise approved by the City, the same manufacturer of each item shall be used throughout the work. 2. Where reference is made to an ASTM, AWWA or APWA designation, it shall be the latest revision at the time of construction, except as noted on the plans or special provisions of the plans. PVC PIPE: P.V.C. pipe shall conform to the provisions of ASTM D-3034, SDR35 unless otherwise specified. Rubber gaskets for P.V.C. pipe shall conform to ASTM METHODS OF CONSTRUCTION: Note: All portions of the newly constructed system shall have a minimum of 4 of risers where the system is brought to finish grade, i.e. manholes, etc. This will allow the lowering of finish grade in the future. PIPE LAYING: 1. Pipe laying shall be in accordance with section 7-08 of the current WSDOT Standard Specifications. 2. Each pipe shall be laid with bells upgrade with the invert of the pipe to the alignment and grade shown on the plans. Care shall be exercised to insure close concentric joints and a smooth invert. Open ends of pipe or fittings shall be temporarily blocked and covered when laying is not in progress. 3. Trench shall be kept dewatered during pipe laying. At no point shall developer allow groundwater to flow into City s sewer system. Downstream manhole or pipe shall be plugged at all times when potential for groundwater to enter sewer system. Sanitary sewer service cannot be interrupted as a result of the plugging. 4. Adjustment to the line and grade shall be done by excavating or filling in and tamping approved pipe bedding material under the body of the pipe. Adjustment to the line and grade by wedging and blocking shall not be permitted. 6

7 5. The pipe shall be lowered into the trench by means of ropes, tripod, crane or any other suitable means. The pipe shall not be dropped or handled roughly. The pipe shall be checked for cracks and defects prior to use, and any defective pipe shall be rejected. 6. Wyes shall be installed as shown on the Standard Details as contained herein and at such locations as are shown on the plans or as otherwise directed by the City. These items shall not be covered until the City has recorded their exact location. 7. Pipe laying shall start from the lowest point unless otherwise approved by the City. REPAIR OF NEWLY CONSTRUCTED PVC SEWER MAIN(S): When a newly constructed PVC sewer main line needs to be repaired, contractor shall install a new 12 piece of pipe centered between joints on the existing main. Therefore, there shall be a 12 separation between PVC couplers. WATERMAIN CROSSINGS All sanitary sewer/water crossing shall be per the Washington State Department of Ecology s Criteria for Sewage Works Design. A copy of the design manual is available for reference in the City of Ellensburg Public Works Department. See also Section 1 of these Standards for design criteria. PRESSURE SEWER PIPE: 1. All materials shall be new and undamaged. Unless otherwise approved by the City, the same manufacturer of each item shall be used throughout the work. 2. Where reference is made to an AWWA, APWA or ASTM designation, it shall be the latest revision at the time of construction, except, as noted on the plans or special provisions of the plans. PRESSURE SEWER MAINS: 1. Pressure sewer mains shall be Sch. 40 P.V.C. or H.D.P.E. pipe, and shall conform to AWWA C-900. Joints shall be made up as recommended by the pipe manufacturer for pressure pipe, shall be class 160 minimum. H.D.P.E. pipe for force mains or special conditions shall be in accordance with the Department of Ecology s Criteria for Sewage Works Design, including meeting the requirements for the force main pressure test as stated therein. 2. Ductile iron pipe shall conform to AWWA C-100. Joints shall be made up as recommended by the pipe manufacturer for the particular joint as specified. 3. Pressure sewer mains shall be laid so that no high point exists except at the 7

8 discharge manhole or an air release assembly. Valves with O-ring seals shall be opened and shut under pressure to check operation without leakage. Two-piece cast iron valve boxes shall be set as directed by the City. JOINTS: 1. Only pipe layers experienced with the type of gasket being used shall be allowed to lay the pipe. The City may demand proof of such experience before pipe laying may begin or be continued. 2. Joint material shall be used in accordance with the recommendations of the manufacturer. Pipe handling after the gasket has been affixed shall be carefully controlled to avoid bumping the gasket and thus knocking it out of position or loading it with dirt or other foreign material. Any gasket so disturbed shall be removed and replaced, cleaned and re-lubricated, if required, before the joint is attempted. 3. Care shall be taken to properly align the pipe before joints are seated. During insertion of the tongue or spigot, the pipe shall be partially supported by hand, sling or crane as required to minimize lateral pressure on the gasket and to maintain concentricity until the gasket is properly positioned. Pipe deflection and straightening shall be held to a very minimum once the joint is seated to prevent creep of the joint. 4. Sufficient pressure shall be applied in making the joint to assure that the joint is seated as defined in the standard installation instructions provided by the pipe manufacturer. Sufficient restraint shall be applied to the line to assure the joints, once seated, are held so, by tamping approved pipe bedding material under and alongside the pipe or otherwise. At the end of the day's work, the last pipe shall be blocked in such a manner as may be required to prevent creep during down time. ALIGNMENT & GRADE TOLERANCE: 1. The maximum tolerance from true line and grade shall be as follows: a. Maximum deviation from established line and grade shall not be more than ± ½. b. No adverse grade in any pipe length will be permitted. c. The difference in deviation from established line and grade between two successive joints shall not exceed 1/3 of the amount specified above. d. Refer to APWA Standard Specifications for deflection criteria. 8

9 TRENCH EXCAVATION: Clearing and grubbing where required shall be performed within the easement or public right-of-way and as permitted by the property owner and/or governing agencies. Debris resulting from the clearing and grubbing shall be disposed of by the Developer in accordance with the terms of all applicable permits. Trenches shall be excavated to the line and depth designated by the approved plans to provide a minimum of 48 inches of cover over the pipe, unless otherwise approved. The trench width shall be excavated only to such widths as are necessary for adequate and safe working space. The trench shall be kept free from water until complete. Surface water shall be diverted so as not to enter the trench. The Developer shall maintain sufficient pumping equipment on the job to insure that these provisions are carried out. The Developer shall perform all excavation. Boulders, rocks, roots and other obstructions shall be entirely removed or cut out to the width of the trench and to a depth 4 inches below sewer main grade. Where material is removed from below subgrade, the trench shall be backfilled to grade with material satisfactory to the City and thoroughly compacted to 85% for easements outside of roadway and 95% in streets, alleys or traveled ways, using standard proctor testing. The Developer shall be responsible for meeting current Labor and Industry Trench and Shoring Protection and Washington State Safety Standards. Unsuitable material below the depth of the proposed pipe shall be removed and replaced with satisfactory materials as determined by the City. When trenching operations cut through asphalt/concrete pavement, the pavement shall be sawcut, and removed to a solid edge along the width of the trench as approved by the City engineer. SEE Surface Restoration for Trenches Standard Details in the Street Section of these Standards. Trenching operation shall not proceed more than 200 feet in advance of pipe laying without written approval of the City. SHORING: The Developer shall provide and install shoring as necessary to protect workers, the work, existing utilities, and other properties. TUNNELING: Tunneling may be ordered by the City or agency having jurisdiction over the roadway. The Developer may tunnel in lieu of trenching for deep cuts. Refer to the Misc. Section of these Development Standards to see the requirements, and if it will be allowed, to trench across a roadway. 9

10 JACKING OR BORING - ROADWAY CROSSINGS: The Developer may use any method which provides satisfactory results and is acceptable to the governmental agency having control of the road and to the City, provided that the Developer restores the crossing to its original condition. Normally, these crossings require the placing of steel, cast iron or concrete pipe casing by jacking or tunneling and laying the sewer line within the casing. PIPE BEDDING: Sewer mains shall be bedded in pea gravel per Standard Detail. If pipe is laid within ordinary high ground water elevation, place suitable native or clay dams in place of pea gravel bedding every 300 of pipe. This will help provide a groundwater dam. FOUNDATION GRAVEL: Foundation gravel shall be coarse graded gravel or crushed rock passing through a 3-inch screen. Pit run passed through a 3-inch screen and thoroughly compacted may be used provided that it is, in the opinion of the City, properly graded and otherwise suitable. MANHOLES: Note: Developer is required to submit the shop drawings to the City and obtain City approval for all proposed structures prior to delivery. 1. Manholes shall be constructed as shown in Standard Details for manholes and drop manholes. Manholes shall be precast reinforced concrete. Manhole ring and covers shall be adjusted to the elevation required by the City prior to final acceptance of the work. Outlet invert shall be one tenth of a foot (0.1 ) below the inlet invert elevation, when outlet and inlet are the same size of pipe. When pipe diameters are different, set crowns of pipes at the same elevation. 2. The manhole base slab shall be placed on pea gravel. If the foundation material is inadequate, the Developer shall overexcavate and place foundation gravel, bedding gravel or concrete under the normal base to support the manhole. 3. Manhole connections shall be through rubber boot connections, Kor-N-Seal rubber gasket or approved equal. The gasket shall be installed such that the boot points out of the manhole. The connection shall be grouted outside and inside. All joints between manhole sections and riser rings shall be seased and receive a 3/4 inch thick smooth grout finish on the manholes, in accordance to the City of Ellensburg Standard Drawings included in this Section. 4. Manholes shall be placed at every angle point, street and alley intersection, and at distances not greater than 400 for sewers 15 in diameter or less, and 500 for sewers with diameters of 18 to 30. A manhole shall be placed at 10

11 the upstream end of all sewer mains. Cleanouts may only be used if all three of the following conditions are met: the cleanout is at the end of an 8 diameter main; the line is no longer than 150 ; the line is expected to be extended in the foreseeable future. A connection serving more than one building lot shall require a manhole, or cleanout. 5. Where manholes are installed over an existing sewer main, two options will be available: 1) place a concrete cast in place base and channel manhole, or 2) cut existing main and install a precast base. The City will determine which method is appropriate based upon base flow in sewer and availability to bypass pump existing sewage. INSTALLATION STAKING: The Developer shall furnish grade, cut and finish staking for the excavation and installation of sanitary sewer mains, manholes and appurtenances. Survey control for the work shall be performed by or under the direction of a professional land surveyor. Surveyor or Developer shall submit cut sheets to City inspector prior to commencing work activities. CLEANING AND FLUSHING: 1. Prior to pipe testing, all pipes shall be cleaned and flushed. 2. All debris flushed out shall be removed at the first manhole downstream where its presence is noted. In the event cemented or wedged debris or a damaged pipe exists, the Developer shall remove the debris and replace the damaged pipe. 3 Developer must have a City representative onsite during all flushing operations. The downstream pipe in the manhole shall be plugged during the flushing operations, and in no event shall material be able to flow down the pipe system into the City s sanitary sewer system. TESTING OF GRAVITY SEWERS: Method of testing gravity sewers and manholes shall be as follows: Testing shall be as specified in the most current version of Section of the WSDOT Standard Specifications. The following requirements for Sewer testing is from the 2004 Standard Specifications WSDOT Standard Specifications (2) Cleaning and Testing (2)A General Sewers and appurtenances, where required in the Plans, shall be cleaned and tested after backfilling by either the exfiltration or low pressure air method at the option of the Contractor, except where the ground water table is such that the Engineer may require the infiltration test. All work involved in cleaning and testing sewer lines between manholes or rodding 11

12 inlets as required shall be completed within fifteen working days after backfilling of sewer lines and structures. Any further delay will require the written consent of the Engineer. The Contractor shall furnish all labor, materials, tools, and equipment necessary to make the test, clean the lines, and perform all incidental work. The Contractor shall perform the tests under the direction and in the presence of the Engineer. Precautions shall be taken to prevent joints from drawing during tests, and any damage resulting from these tests shall be repaired by the Contractor at no expense to the Contracting Agency. The manner and time of testing shall be subject to approval by the Engineer. All wyes, tees, and stubs shall be plugged with flexible jointed caps, or acceptable alternate, securely fastened to withstand the internal test pressure. Such plugs or caps shall be readily removable, and their removal shall provide a socket suitable for making a flexible jointed lateral connection or extension. Testing side sanitary sewers shall be for their entire length from the public sewer in the street to the connection with the building s plumbing. Their testing shall be as required by the local sanitary agency but in no case shall it be less thorough than that of filling the pipe with water before backfilling and visually inspecting the exterior for leakage. The decision of the Engineer as to acceptance of the side sanitary sewer shall be final. If any sewer installation fails to meet the requirements of the test method used, the Contractor shall determine, at no expense to the Contracting Agency, the source or sources of leakage and shall repair or replace all defective materials or workmanship at no expense to the Contracting Agency. The complete pipe installation shall meet the requirements of the test method used before being considered acceptable (2)B Exfiltration Test Prior to making exfiltration leakage tests, the Contractor may fill the pipe with clear water to permit normal absorption into the pipe walls provided, however, that after so filling the pipe, the Contractor shall complete the leakage test within 24 hours after filling. When under test, the allowable leakage shall be limited according to the provisions that follow. Specified allowances assume pre-wetted pipe. Leakage shall be no more than 0.28 gph per inch diameter per 100 feet of sewer, with a hydrostatic head of 6 feet above the crown at the upper end of the test section, or above the natural ground water table at the time of test, whichever is higher. The length of pipe tested shall be limited so that the pressure at the lower end of the Section tested does not exceed 16 feet of head above the invert, and in no case shall be greater than 700 feet or the distance between manholes when greater than 700 feet. Where the test head is other than 6 feet, the maximum leakage shall not exceed 0.28 gallons per hour per inch of diameter per 100 feet of pipe length times the square root of the test head. The leakage can be determined from the equation: SANITARY SEWERS 7-17 Page Standard Specifications Maximum leakage (in gallons per hour) where: D = diameter (in.) L = length of pipe (ft.) H = test head (ft.) When the test is to be made one joint at a time, the leakage per joint shall not exceed the computed allowable leakage per length of pipe (2)C Infiltration Test Where the natural ground water head over the pipe is 2 feet or less above the crown of pipe at the upper end of the test section, the infiltration test leakage shall not exceed 0.16 gallons per hour per inch of diameter per 100 feet of pipe length. The length of pipe tested shall not exceed 700 feet or the distance between manholes when greater than 700 feet. Where the natural ground water head is greater than 2 feet, the maximum leakage shall not exceed 0.16 gallons per hour per inch of diameter per 100 feet of pipe length times the square root of the natural ground water head. The leakage can be determined from the equation: 12

13 Maximum leakage (in gallons per hour) where: D = diameter (in.) L = length of pipe (ft.) H = natural ground water head (ft.) When a suitable head of ground water exists above the crown of the pipe and when the pipe is large enough to work inside, acceptance may be based on the repair of visible leakage by means satisfactory to the Engineer (2)D Other Test Allowances For either the infiltration or exfiltration test, all lateral or side sewer branches included in the test section shall be taken into account in computing allowable leakage. An allowance of 0.2 gallons per hour per foot of head above invert shall be made for each manhole included in a test section. Upon final acceptance of the work all sewers, side sewers and fittings shall be open, clean, and free draining (2)E Low Pressure Air Test for Sanitary Sewers Constructed of Air-Permeable Materials Air-permeable materials include concrete and vitrified clay. Low pressure air testing may be used for air-permeable pipes 30 inches in diameter and smaller. The test equipment to be used shall be furnished by the Contractor and shall be inspected and approved by the Engineer prior to use. The Engineer may at any time require a calibration test of gauges or other instrumentation that is incorporated into the test equipment. Calibration tests shall be certified by an independent testing laboratory. Plugs used to close the pipe for the air test must be securely braced to prevent the unintentional release of a plug which can become a high velocity projectile. Gauges, air piping manifold, and valves shall be located at the top of the ground. No one shall be 7-17 SANITARY SEWERS 2004 Standard Specifications Page 7-55 permitted to enter a manhole or catch basin where a plugged pipe is under pressure. Air testing apparatus shall be equipped with a pressure release device, such as a rupture disk or a pressure relief valve, designed to activate when the pressure in the pipe exceeds 2 psig above the required test pressure. If the pipe to be tested is submerged by groundwater, the back pressure on the pipe created by the groundwater submergence must be determined. All gauge pressures described in the test shall be increased by that amount. The first section of pipe installed by each crew shall be tested in order to qualify the crew and material. A successful test for the section shall be a prerequisite to further installation by that crew. Following the initial test, pipes shall be tested from manhole to manhole, catch basin to catch basin, or such shorter lengths as determined by the Contractor. Air shall be slowly supplied to the plugged pipe section until the internal air pressure reaches 4 psig. Wait at least two minutes to allow for pressure and temperature stabilization to occur within the pipe. When the pressure decreases to 3.5 psig, the air pressure test shall begin. The test shall consist of measuring the time in seconds for the pressure in the pipe to drop from 3.5 psig to 2.5 psig. The pipe shall be considered acceptable if the time in seconds for the pressure drop is equal to or greater than the required time as calculated below: K = d2L C = dL If CT -1, then time = KT If 1 <CT <1.75, then time = KT/CT If CT 1.75, then time = KT/1.75 where: d = Pipe diameter (inches) L = Pipe length (feet) K = value for each length of pipe of a specific diameter C = value for each length of pipe of a specific diameter KT = sum of all K values 13

14 CT = sum of all C values This method was developed based on an allowable air loss rate of.003 cubic feet per minute (cfm) per square foot of internal pipe surface, with the total air loss rate not less than 2 cfm nor greater than 3.5 cfm. At the Contractor s option, the pipe may be tested without pre-wetting; however, the allowable air loss rate assumes pre-wetted pipe. Pipe over 30 inches in diameter shall be tested one joint at a time in accordance with ASTM C (2)F Low Pressure Air Test for Sanitary Sewers Constructed of Non Air-Permeable Materials Non air-permeable materials include ductile iron, ABS composite, polyvinyl chloride (PVC), and polyethylene (PE). When non air-permeable pipe is subjected to a low pressure air test, all of the provisions of Section (2)E shall apply, except that the time in seconds for the pressure drop shall be equal to or greater than four times the required time calculated in Section (2)E. SANITARY SEWERS 7-17 Page Standard Specifications Pipe over 30 inches in diameter shall be tested one joint at a time in accordance with ASTM C Reaches of thermoplastic pipe containing no joints shall be exempt from testing requirements. The use of air pressure for testing sewer lines creates hazards that must be recognized. The Developer shall be certain that all plugs are securely blocked to prevent blow outs. A supply air regulator shall be installed on the air supply line to the sewer that shall permit a maximum of 10 psi in the line to be tested. All pressure shall be relieved from the sewer section being tested prior to removal of test plugs. TESTING OF PRESSURE SEWER MAINS: Testing of pressure sewer mains shall be as prescribed in the Washington State Department of Ecology s Criteria for Sewage Works Design. SIDE SEWERS: Sidesewers shall be constructed with 4 or 6 inch pipe and bedded in pea gravel. See sidesewer standard detail for further installation information and material requirements. SEWER CONNECTION INSPECTIONS Sewer connection inspections are required and must be inspected per the City s permit. A Public Works and/or Sewer Permit is required for installations on a new main, and the City s public works inspector shall observe construction and testing with the new main. City crews will perform side sewer tap connection to existing mains. It shall be the developer s responsibility to perform excavation and properly shore trench to allow City crew to perform tap. Developer will then construct side sewer from tap to lot. 14

15 SEPTIC TANKS: Acceptance of septic tanks shall be as allowed by City Code and shall be regulated per the requirements of the Kittitas County Health Department. Any new construction, requiring sewer services, within the City Limits, or within the Urban Growth Area and under 200 LF away from an existing sewer main will be required to connect to City sewer system. A failed septic system within the City Limits and/or the UGA and within 200 LF of an existing sewer main, will be required to connect to the City Sewer System. Abandoning septic tanks shall meet the requirements of the Health Dept. Sewer mains shall be extended and connected per the requirements of this Section. PUMP STATIONS (Serving Multiple Properties): 1. Pump stations shall only serve those properties that cannot otherwise be served by conventional gravity sewers or septic tanks. 2. Pump stations shall be approved on an individual basis by the City. Design shall be as approved by the City and the pump station shall be maintained by the City once accepted by the City. TELEVISION INSPECTION A. Upon completion, and prior to acceptance, of installation or repair of any sewer main, all sewer mains shall be visual and television inspected by the City. This inspection and recording shall be performed in the presence of the City inspector and the Developer. Any defects in material or workmanship discovered shall be repaired by the Developer prior to acceptance. The City will perform one television inspection free of charge. The Developer shall be responsible for any costs incurred, including administration fees for additional inspections or trips to jobsite. TYPICAL BUILDING SEWER CONNECTION (Side Sewer): The typical building sewer connection shall be a four inch (4 ) minimum for single family structures; otherwise it shall be a six inch (6 ) minimum. Applicants needing a pumping system for their service line shall submit drawings and catalog cuts to the City of Ellensburg for approval prior to installation. MATERIALS ALLOWED: (Main to house or structure) Refer to the Standard Details included in this section or 6" PVC pipe and fittings ASTM D-3034 (molded gasket type bell, usually 20 foot length) or 6" ABS pipe schedule 40 (black). Non-pressure use only or 6 Ductile Iron Pipe (AWWA C 151). 15

16 GENERAL REQUIREMENTS: 1. A cleanout is required just outside the building on new construction. An additional cleanout is required at intervals of not more than 100' from the sewer main or after each 90 of accumulated bend of fittings. cleanouts shall consist of a wye branch in the side sewer. 2. If installation is near a tree, cutting off gasketed bell and using glue couplings may be required by City engineer. 3. Pipe must be installed bell facing upstream. 4. Minimum slope 2% for 4 connections and 1% for 6 connections. 5. Sewer services on commercial property shall be 6 services. The Public Works Department may approve 4 services for commercial property in low flow situations, upon request from Contractor or Developer. 6. If the lowest floor served is lower than the lowest manhole lid in the street, a backflow valve must be installed. 7. Pipe must be bedded per the Standard Details. 8. Abandoned septic tanks must meet requirements of the City Code and Kittitas County Health Department requirements. Tanks must be pumped and backfilled with clean fill. 9. Property owner shall have maintenance responsibility for the entire side sewer from the main to all structures served by the side sewer. 10. Storm sewers, basement drains, sumps, and roof drains may not under any circumstances be connected to the sanitary sewer system. 11. Developer shall install side sewers from the main to a point ten feet into the property. The end of the lateral shall be at least four feet (4') deep at the property line. Depth shall be sufficient to provide a minimum of 30 cover on private property. The lateral shall be capped and marked with a green painted pressure treated 4 by 4 post that shall stick vertically a minimum of 24 above ground level and be wrapped with green tracer wire. An eighteen inch long #4 rebar shall then be driven flush with the ground marking the 4 by 4" location. 16

17 DOMESTIC SEWER, STORM SEWER and WATER MAIN EXTENSIONS RECORD DRAWINGS Record drawings of all improvements deeded or conveyed to the City of Ellensburg shall be provided. Record drawings shall show all modifications made during construction. They shall also show precisely the location of all buried utilities, including the measured distance to all tees, bends, wyes, and the distance from valves or structures to fittings. The location of water, sanitary sewer, and storm sewer facilities shall be indicated by showing measured distances to monuments or other approved permanent reference. Record drawings turned over to the City upon acceptance of the utilities shall meet the requirements of the Drafting Section of these Development Standards. 17

18 AGREEMENT FOR EXTENSION OF ELLENSBURG INFRASTRUCTURE (WATER and/or SEWER) This AGREEMENT is executed, 20 by the City of Ellensburg (herein City ) and (herein Developer ). WHEREAS, the Developer desires to develop certain real property situated in the County of Kittitas, State of Washington, particularly described as: and to install a system of streets, pipes and appurtenances for the above described property to enable the delivery of domestic water, wastewater, or transportation from the City s existing service; WHEREAS, the City will approve the proposed facilities and furnish said connections upon the Developer s facilities upon the Developers full compliance with the terms, conditions and covenants of this agreement; NOW, THEREFORE, it is mutually agreed as follows: 1. DEVELOPER TO FURNISH DESCRIPTION: Developer shall furnish to the City a legal description of the real property which he/she plans to develop. A copy of the legal description is attached to this Agreement as Exhibit A. 2. DEVELOPER TO FURNISH DEVELOPMENT PLAN: Developer shall also furnish to the City a copy of his/her plan to develop or subdivide the Exhibit A real property. 3. PREPARATION OF INFRASTRUCTURE PLAN: Upon receipt of the Developer s plans, the City shall provide basic information as needed by the Developer to prepare an infrastructure plan. Developer will be responsible for the cost of preparation of the plan. The plan shall be prepared by a professional engineer licensed in the State of Washington. The plan shall include the following: a. The location of connection to the City s existing systems for the purpose of supplying service to the proposed development. b. A plan/profile of all transportation and pipe system facilities to be installed to serve the development and its components. c. The pipe sizes and specifications of all mains and laterals. 18

19 d. All fittings, equipment and material to be installed in connection with the mains and laterals in order to transport water from the City s system to the point of utilization. e. Standards and methods of construction as adopted herein shall be in full force for this agreement. f. Any other information which the City determines is required by the particular circumstances involved. 4. DEVELOPER TO PROVIDE PROOF OF INSURANCE: Developer shall have system installed by a licensed and bonded contractor. The contractor shall furnish proof of license, bond and insurance. The Developer may elect to install the infrastructure system with his own forces. The City will require that the Developer have public liability and property damage insurance coverage as outline in the Bonding and Insurance Section of the Development Standards. 5. CONSTRUCTION OF SYSTEM: Developer will construct or cause to be constructed a completed system, in full conformity with the infrastructure plan, as prepared by the Developer s Engineer. The City s standards, conditions and specifications shall be followed in the construction process. 6. RECORD DRAWING PLAN: Developer or Developer s Contractor will provide a copy of the Record Drawing Plan showing final relations to the property lines and other physical features. Record Drawings shall be in accordance to the Drafting Section of these Development Standards. Bond will not be released until Record Drawings are completed and approved. 7. EASEMENT DESCRIPTIONS: Easements for the entire infrastructure shall be a minimum of 10 feet wide. Easement legal descriptions shall be prepared by a surveyor or engineer licensed to practice in the State of Washington. Easement legal descriptions shall be reviewed and approved by the City Engineer prior to acceptance and recording. 8. CITY S INSPECTION AND DIRECTION: The City, by its agents, servants and employees, shall have the right to enter upon the Developer s property, at any time prior to the completion of the construction, installation, inspection and testing of the system to inspect the construction and/or direct the Developer, his contractor, agents, or employees, to take any action necessary to fully comply with the infrastructure plan. Developer shall take, or cause to be taken; any action directed by the City and shall cause such system to be constructed in all respects in full conformity with the plan. Developer will be required to get a permit from the City of Ellensburg prior to construction, which will include the Inspection costs for City inspectors. If the scope of the project requires such, the City will require the design-engineering firm to provide inspection of the construction work. The Developer shall be responsible for the charges from the engineering firm. The City and the engineering firm shall coordinate the inspections and resolve any disputes regarding plan or specification interpretation. 19

20 9. INSTALLATION OF STREETS, MAIN TAPS OR CONNECTIONS: All connections to existing City facilities, necessary to serve such water and wastewater systems, shall be installed by the Developer, at the expense of the Developer. All costs shall be paid in full prior to acceptance of the system by the City. 10. INSPECTION AND TESTING OF COMPLETED SYSTEM: When the Developer believes that the system has been completed in full conformity with the Infrastructure Plan, he shall notify the City. The City shall inspect the system and be present during tests to the system as the City shall specify. Such testing shall be at the expense of the Developer. Following such testing, the City shall notify the Developer of its approval of the system, or of any additions, changes or modifications required prior to such approval. 11. ACCEPTANCE OF SYSTEM: Upon approval of the construction and conveyance of the water and sewer systems by the City, and the deposit of cash or a bond by the Developer as hereinafter provided, the City shall notify the Developer of its acceptance of the system. The system shall then become a part of the City s system. Thereafter, the Developer and his assigns shall be entitled to receive services from the City in the same manner, and upon the same terms as other users within the City. 12. REPAIRS TO AND REPLACEMENT OF SYSTEM: Following the acceptance of the said system by the City, the responsibility for repairs and replacements thereto shall be as follows: a. For the first twelve months following such acceptance, the obligation and expense of any repairs or replacements to the system which are required by the City shall be that of the Developer. Any such repairs or replacement shall be done by the City. The cost shall be paid by the Developer, as computed by the City. The Developer shall deposit with the City either cash or a performance bond with a surety acceptable to the City in the sum of 10 percent of construction costs. In the event the Developer fails or neglects to pay the costs of any such repairs or replacements during the twelve month period, the costs may be assessed against the surety bond. After the Developer s responsibility for repair or replacement has terminated, any balance of the cash deposit will be refunded to the Developer. b. Twelve months after the acceptance of the infrastructure, the responsibility for the repair and replacement of that portion of the system conveyed by the Developer to the City shall become the responsibility of the City. 13. CITY RULES AND REGULATIONS: The Developer, his successors and assigns shall be subject to existing or as amended ordinances, rules and regulations of the City at the time of development. 14. BINDING AGREEMENT: The terms, conditions and covenant hereof shall extend to and be binding upon the heirs, successors, and assigns of the parties to this agreement. 20

21 15. INDEMNIFICATION: The permittee shall indemnify, defend and hold harmless the City, its officers, agents and employees, from and against any and all claims, losses or liability, including attorney fees, arising from injury or death to persons or damage to any other cause related to the improvement for which this agreement is granted. With respect to this agreement and to claims against the City, its officers, agents and employees, the permittee expressly waives its immunity under Title 51 of the Revised Code of Washington, the Industrial Insurance Act, for injuries to any employee the permittee may have, and agrees that the obligation to indemnify, defend and hold harmless provided for in this paragraph extends to any claim brought by or on behalf of any employee of the developer. This waiver has been mutually negotiated by the parties as part of the agreement process and is given, as is the indemnification agreement contained within this paragraph, as consideration for the City allowing development. This paragraph shall not apply to any damage or injury resulting from the sole negligence of the City, its agents or employees. The extent any of the damages or injuries referenced by this paragraph were caused by or resulted form the concurrent negligence of the City, its agents or employees, this obligation to indemnify, defend and hold harmless is valid and enforceable only to the extent of the negligence of the developer, its officers, agents or employees, if any. 16. ADDITIONAL COVENANTS AND TERMS: (if any) IN WITNESS WHEREOF the parties have caused this instrument to be executed the day and year first written. Developer Developer Public Works Director or City Engineer 21

22 22

23 23

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