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HomeMy WebLinkAboutChapter 8-5I 8-5-1 " CHAI T �. SEA SECTION: 8-5- 1: Definitions 8-5- 2: Use of Public Sewers Required 8-5- 3: Private Sewage Disposal 8=5- 4: Building Sewer Permits 8-5- 5: Independent Sewers; Cost of 8-5- 6: Specifications for Building Sewers ` 8-5- 7: Connection of Building Sewer to Public Sewer 8-5- 8: : Inspection 8-b- 9: Precautions While Building 8-5-10: Use of Public Sewers 8-5-11: Grease, Oil and Sand Interceptors 8-5-12: Preliminary Treatment of Waste Matter 8-5-13: Manholes 8=5-14: Examination of Water and Sewage . ; 8-5-15: Sewer Charges 8=5-16: Billings and Collections 8-5-17: Charges for Property Not Previously Assessed t 8-5-18: Public Sewer Extension " 8-5-19: Public Sewer Specifications 8-5-20: Penalties for Violations of Regulations 8-5-21: Alternates, Modifications, Appeals 8-5-22: Requirements That Apply Within Zones 1 and 2'of an Aquifer Protection Area ' 8=5-1: DEFINITIONS: Unless the context specifically indicates otherwise, the t z; meaning of terms used in this Chapter shall be as follows: BOD (denoting Biochemical Oxygen Demand): The quantity of oxygen utilized in the biochemical oxidation--' of ,organic matter under standard laboratory procedure in five (5) days at twenty degrees,(20°) Celsius, expressed in parts per million by weight. BUILDING DRAIN: That part of ` the lowest horizontal piping of a drainage system which receives the discharge from soil, waste, and other drainage pipes inside the walls of the building and conveys it to the building sewer, beginning five F City t 8-5-1 GR 5 RS feet (5') outside the inner face of the building walls. BUILDING SEWER: The extension from . the building drain to the public sewer or other place of disposal. CITY COMPREHENSIVE SEWERAGE PLAN: The complete engineering report and plans that guide planning and construction of all new sanitary sewer facilities. COMBINED SEWER: A sewer receiving both surface runoff and sewage. FWPCA: The Federal Water Pollution Control Act of 1956, PL 84-660, together with the amendments of 1966, 1972, and as same may be hereafter amended; Public Law 92-500 and all subsequent amendments thereto. GARBAGE: Solid wastes from the preparation, cooking, and dispensing of food, and from the handling; storage, and sale of produce. INDUSTRIAL WASTES: The liquid wastes from industrial process as distinct from sanitary sewage. INFILTRATION: The volume of water or ground water entering sewers and building sewer connections from the soil through defective joints, broken or cracked pipe, improper connections t or other structural failures. INFILTRATION AND INFLOW: The combined volume of both infiltration and inflow water found in existing sewer systems. INFLOW: The volume of water discharged into sewer lines from surface sources such as roof drains, cellar and yard area drains, foundation drains, swamp and spring water drains, and all other accidental or deliberate discharges of surface water. 1292 'enton 8-5-1 LONG-RANGE WASTEWATER MANAGEMENT PLAN: See City Comprehensive Sewer Plan, NATURAL OUTLET: Any outlet into a watercourse, pond, ditch, lake or other body of surface or ground water; pH: The logarithm of the reciprocal of the weight of hydrogen ions in gramsper liter of solution. PROPERLY SHREDDED ,GARBAGE: The wastes from the preparation, cooking; and dispensing of food that has been shredded to such degree that all particles will be carried freely under the flow conditions normally prevailing in public sewers, with no particle greater than one-half inch ('/2') in any dimension. -PUBLIC SEWER: That portion of a sanitary sewer and its appurtenances located on property, ease- ments and rights of way ;held, owned, controlled and accepted by the City or other public authority. SANITARY .SEWER: ,A sewer which carries sewage and to which storm, surface; and ground waters are not intentionally admitted; SEWAGE: A combination of the water -carried wastes from residences, business buildings, institutions, and industrial establishments, together with such ground, surface, and storm waters as may be present. SEWAGE TREATMENT PLANT: Any arrange- ment of devices ,and structures used for treating sewage. ` SEWAGE WORKS: All facilities for collecting, pumping,` treating, and disposing of sewage. SEWER: A pipe or conduit for carrying sewage. SIDE SEWER: See building sewer. SIDE SEWER STUB: That portion of the building sewer between ;primary collection lines and individual property lines. STORM SEWER and STORM DRAIN: A sewer which carries storm and surface waters and drainage,' but excludes sewage and polluted industrial wastes.; 1292 city 8-5-2 SUSPENDED SOLIDS: Solids that either float on the surface of, or are in suspension in water, sewage, or other liquids; and which are removable by laboratory filtering. WATERCOURSE: A channel in which a flow of water occurs either continuously or intermittently, (Ord. 4343, 2.3-92) 8-5-2: USE OF 'PUBLIC SEWERS REQUIRED: A. It shall be unlawful for any person to place, deposit or permit to be deposited in any unsanitary manner upon public or private property within the City, or in any area under the jurisdiction of said City, any human or animal excrement, garbage, or other objectionable waste. B. It shall be unlawful to discharge to any natural outlet within the City, or in any area under the jurisdiction of said City, any sanitary sewage, industrial wastes, or other polluted waters, except where suitable treatment has been provided in accordance with subsequent provisions of this Chapter. C. Except as hereinafter provided, it shall be unlawful to construct or maintain any privy, privy vault, septic tank, cesspool, or other facility intended or used for the disposal of sewage.. (Ord. 2173,'8-16-65) D. The owner of each house, building or property used for human occupancy, employ- ment, recreation or other purpose, situated within the City and abutting on any street, alley or right of way in which there is now located or may, in the future be located a public sanitary or combined sewer of the City in which said public sewer is within three hundred thirty feet (330') of the property line and which has been determined to be a health hazard by the City or the Seattle - King County Health Department, or its successor agencies, or which has participated and been included in a local improvement district, is hereby required at the owner's expense, to install suitable toilet facilities therein and to connect such facilities directly with the proper public sewerin accordance of Renton 8-5-2 With the provisions of this Chapter, within ninety r (90) days after the date of official notice to do so. (Ord. 4343, 2-3-92) 8-5-3: PRIVATE SEWAGE DISPOSAL: A. Where a public sanitary or combined sewer is not, available under the provisions of this Chapter, the building sewer shall be connect- ed,to a private sewage disposal system com plying with the provisions of this Chapter. B. Before commencement of construction of a private sewage disposal system the owner shall first obtain a written permit signed by the Utilities Engineer, The application for such permit shall be made on a form fur- nished by the City, which the applicant shall supplement by any plane, specifications and other information deemed necessary by the Utilities Engineer. Apermit and inspection fee often dollars ($10.00) shall be paid to the Finance and Information Services Director at the time the application is filed. (Ord. 2801, 9.24-73; amd. Ord. 2845, 4-15-74) C. A permit for a private sewage disposal sys- tem shall not become effective until the in- stallation is completed to the satisfaction of the Utilities Engineer. He shall be allowed to inspect the work at any stage of construction and, in any event, the applicant for the per- mit shall notify the Utilities Engineer when the work is ready for final inspection, and before any, underground portions are covered. The inspection shall be made within forty eight (48) hours of the receipt of notice by the Utilities Engineer whenever possible. (Ord. 2801, 9-24-73 amd, Ord. 2847, 5-6-74) D. The type, capacities, location and layout of a private sewage disposal system shall comply with all recommendations of the Seattle King County Health Department. Field tests and a site survey shall be made "before any permit is issued for any private sewage dis- poeal system employing subsurface soil ab- sorption facilities:. No septic tank or cesspool shall be permitted to discharge to any public sewer or natural outlet. (Ord. 2801, 9-24-73) �t 8-5-4 n i E. Pursuant to RCW 35.67.190, all property owners within the area served by a sewerage system shall be compelled to connect their c, private drains and sewers with the sewerage system, or suffer a penalty. Connection to the public sewer system shall not be compul- sory except under those situations detailed in WAC chapter 246-272-070, as may be amended from time to time, or City Code Section 8-5-21). Any property owner not com polled to connect to the sewerage system and choosing not to connect to the City sewerage system shall be penalized an amount equal to the charge that would be made for sewer service if the property was connected to the sewerage system. All such penalties shall be considered revenue of the sewerage system. After connection to the sewerage system, all septic tanks, cesspools and similar private sewage disposal facilities shall be abandoned and filled with suitable material; provided, however, the owner of the subject premises may suitably clean the septic tank to utilize same and any adjoining drain fields system for the proper disposal of storm waters. (Ord. 4472, 9-12-94) t; F. The owner shall operate and maintain the private sewage disposal facilities in a sani- tary manner at all times, at no expense to the City. G. No statement. contained in this Chapter shall - be construed to interfere with any additional requirements that may be imposed by the Health Officer. (Ord. 2801, 9-24-73), 8-5-4: BUILDING SEWER PERMITS: A. No unauthorized person shall uncover, make any connections with or openings into, use, alter or disturb any public sewer or appurte- nance thereof without first obtaining a writ- ten permit from the Utilities Engineer or his duly authorized representative. Permission to make connection to the public sewer shall' consist of either: 1. A developer extension agreement, wherein permission is granted to make an extension to a public sewer, or 1194 ''i City of Renton $ 8 6 4 8-6_6 2. A building sewer permit, wherein permis- sion is granted to make a connection from Title IX of Ordinance No. 4260 and any sub M Private property to a public sewer. Sequent amendments thereto', (Ord. 3832, 8-13-84) B. A building sewer permit shall include per- mission to construct a side sewer whenever it is required to complete connection. 8-5-5: INIDEPENDENT SEWERS; COST OF: C. There shall be three (3)classes of building sewer A. A separate and independent building sewer shall be provided for every building, permits; except where one building stands at the rear of L For residential service; another on an interior lot and no private sewer is available or can be constructed to 2. For commercial service; and the rear building through an adjoining alley, :." court, yard, or driveway, the building sewer 3. For industrial service. (Ord. 3832, 8-13-84 ) from the front building may be extended to the rear building and the whole' considered D: In each case the owner or his duly authorized as one building sewer. (Ord. 1552, 642-56) `. agent or representative shall make applica- tion in writing on a special form furnished B. Old building sewers may used in connec- " by the City for said purposes. The permit appli- tion with new buildings only when they are cation shall be supplemented by any plane, found, on examination and testa by the Utili- ties Engineer, to specifications or other information consid- ered pertinent in the ud j meet all requirements of this Chapter. (Ord, 1552, 6-12-56 amd. Ord. gment of the Utili- ties Engineer or his duly authorized repre- 2847, 5-6-74) i° sentative. The permit and inspection fees shall be as follows: C. All costs and expense incident to the instal - lation and connection of the building sewer' 1. The sum of sixty dollar, ($60.00) for a shall be borne by the owner or applicant of residential building sewer permit. the premises in question. The owner shall indemnify the City ,- 2. The sum of eighty dollars ($80,00) fora again at any loss or dam-' age that may directly or indirectly be occa- business or commercial building sewer per- mit. P sioned swer. Or the installation of the building sewer. (Ord. 1662, 6-12-b6)'> ? 3. The sum of one hundred dollars l0o.00 ($ ) for an industrial building sewer 8-5-6: SPECIFICATIONS FOR BUILDING< permit. SEWERS: The building sewer shall be 4. The sum of twenty dollars ($20.00 fora ) ductile iron pipe class 50, PVC plastic pipe ASTM permit for the necessary repair of any of the above sewer connections. epee. D3034 or equal, or other suitable material' approved by the Utilities Engineer. Joints shall be tight and waterproof. An P y part of the building And all such fees shall be paid to the Finance and Information Services Director sewer that is located within ten feet (10') of a water service pipe shall be constructed of ductile or his duly designated representative at the time the iron pipe with push -on rubber gasket joints. If application for such permit` is filed. (Ord. 4287,8-13-90) installed in filled or unstable ground, the building; sewer shall be of ductile iron Pipe with push -on rubber :gasketedjoints. E. In addition to other permits and fees, there Will be an inspection/approval fee for on The size and slope of the building sewer shall be t -site replacement and improvements which shall be identical to that specified in subject to the approval of the Utilities Engineer. The standard minimum sizes and slopes are: Chapter 10, 1. See Section 9-10-313 of this Code. 1194 ..�s City of Renton 8-5-6 In all buildings in which any building drain is too low to permit gravity flow to the public sewer, sanitary sewage carried by such drain shall be lified by approved artificial means and discharged to the building sewer.' All excavations required for the installation of a building sewer shall be opentrench work unless otherwise approved by the Utilities Engineer. Pipe, laying and rbackfill 'shall be performed in accor- dance with ASTM spec. C12-19 and APWA spec. Sec. 60 except that no backfill'shall be placed until the work has been inspected: All joints and connections shall be made gastight and watertight, and installed in accordance with APWA spec` 62-3.98A. Concrete pipe joints shall conform with ASTM C-443. Ductile iron pipe push -on joints shall con- form with' ANSI A-21.11. PVC pipe joints shall conform with ASTM D 2680. Otherjointing materials and methods may be used onlyby; written approval of the Utilities Engineer. (Ord. 4343,' 273-92) 8-5-7: CONNECTION OF BUILDING SEW- ER TO PUBLIC SEWER; The connec- tion of the building sewer into the public sewer shall be made at a side sewer stub, if such a stub is available at a'suitable location and is found upon examination and tests by the utility to meet all standards and specifications of the City. If no stubs are 'suitably located or if the existing stub(s) are found not to meet all standards and specifica- tions, the property owners shall, at their expense, have a new side sewer stub installed. All such connections shall be made under permit issued' by the utility and per City standards and specifica- tions. (Ord. 4343, 2-3-92) 8-5-8: INSPECTION: The applicant for the building sewer .permit 'shall notify the Utilities 'Engineer when the building sewer is ready for inspection and connection to the public sewer. The connection shall be made under the super- vision of the Utilities Engineer or his representa- -�ive. 8-5-9: PRECAUTIONS' ' WHILE BUILDING: All excavations for building sewer instal- 8-5-10 lation shall be guarded with barricades and lights and such other precautions as are reasonably ade- quate to protect the public from accident and in- jury. Streets, sidewalks, parkways and other public property disturbed in the course of the work shall n be restored in a manner satisfactory to the City. A surety bond in an amount deemed sufficient and determined by the Utilities Engineer, but in no event less than five hundred dollars ($500.00), shall be furnished and deposited with the City to indem- nify the City against any loss, damage, liability in connection with such sewer work. 8-5-10: USE OF PUBLIC SEWERS: No person shall discharge or cause to be discharged v any storm water, surface water, ground water, roof run-off, subsurface drainage, cooling water or un- polluted industrial process waters to any sanitary sewer. Storm water and all other ,unpolluted drain- age shall be discharged to such sewers as are spe- cifically designated as combined sewers or storm E sewers, or to a natural outlet approved by the Utilities Engineer. Industrial cooling water or un- polluted process waters may be discharged, upon approval of the Utilities Engineer, to a storm sewer combined sewer or natural outlet. R Except as hereinafter provided, no person `.shall discharge or cause to be discharged any of the following described waters or wastes to any public sewer: A. Any liquid or vapor having, a temperature higher than one hundred fifty degrees (150°) F. B. Any water or waste which may contain more than one hundred;'(100) parts per million, by weight, of fat, oil or grease. C. Any gasoline, benzene, naphtha, fuel oil, or . other flammable or explosive liquid, solid or gas. D. Any garbage that has not - been properly shredded. E. Any ashes, cinders, sand, mud, straw,'shav- ings, metal, glass, rags, feathers, tar, plastics, wood, paunch manure, or any; other solid or viscous substance capable of causing obstruc- tion to the flow in sewers or other, inter ference with the proper operation of the sew- age works. 492 8.5-10 P, Any waters or wastes having a pH lower than five and five -tenths (5.5) or higher than nine (9.0) or having any other corrosive property capable of causing damage or hazard to struc- tures, equipment, -and personnel of the sewage works. h, G. Any waters or wastes containing a toxic or %' poisonous substance in sufficient quantity to injure or interfere with any sewage treatment process, . constitutea hazard to humans or animals, or create any hazard in the receiving waters of the sewage treatment plant. H. Any waters or wastes containing suspended solids of such character and quantity that unusual attention or expense is required to << handle such materials at the ,sewage treat- ment plant.' I. Any noxious or malodorous gas or substance capable of creating; a public nuisance. (Ord. 1552, 6-12-56; amd. Ord. 2847, 5-6-74) 8.5-11: GREASE, OIL AND SAND INTER CEPTORS: Grease, oil and sand inter - captors .or other approved methodology shall be provided when, in the opinion of the 'Utilities En- gineer, they are necessary for the proper handling of liquid wastes containing grease in excessive amounts; or any flammable wastesf'sand and other harmful ingredients; except that such interceptors shall not be required for private living quarters or dwelling units. All interceptors shall be of a type and capacity approved by the Utilities Engineer, and shall be located as to be readily and easily accessible for cleaning and inspection. Grease and oil interceptors shall be constructed of impervious materials capable of withstanding abrupt and extreme changes in temperature. They 'shall beof substantial construction, watertight and equipped with easily removable covers which, when bolted in place, shall be 'gastight, and watertight. Where installed, all grease, oil and sand intercep- tors shall be maintained ,by the owner, r at his ex- pense, in continuously efficient operation at all times. Grease and oil interceptors shall be required on all restaurants, garages and, gas station premises and shall be so situated as to intercept only the sources of grease and oil wastes but excluding domestic or human wastes. (Ord. 4343, 2-3-92) 492 8-5-13 8-5-12: PRE, LIMINARY TREATMENT Or, WASTE MATTER: The admission into the public sewers of any waters or wastes having a) -a five (5) day biochemical oxygen demand grest- er than three hundred (300) parts per <million, by weight, or b) containing more than three hundred fifty (350) parts per million by weight of suspended solids, or c) containing any quantity, of substances having the characteristics described in certain sections of this Chapter, or d) having an average daily flow greater than two , percent (2%) of the average daily sewage flow of the City,, shall be subject to the review and approval of the Utilities Engineer. Where necessary in the opinion of the Utilities Engineer, the owner shall provide, at his expense, such preliminary treatment as may be necessary to, a) reduce the biochemical oxygen demand to three hundred (300) parts .per million and the suspended solids to three hundred fifty (350) parts per million by weight, or b) reduce objectionable_ characteristics or constituents to with- in the maximum limits provided for in certain sections of this Chapter, or c) control the quan- tities and rates of discharge of such waters or wastes. Plans, specifications, and any ,other per- tinent information relating to proposed preliminary treatment facilities shall be submitted for the 'ap- proval of the Utilities Engineer and the Depart- ment of Ecology of the State of Washington and no construction of such facilities shall be commenced until said approvals are obtained in writing. (Ord. 1552, 6-12-56; amd. Ord. 2847, 5-6-74; Ord. 3055, 8-9-76) Where preliminary treatment facilities are provided ?" for any waters or wastes, they shall be maintained continuously in satisfactory and effective' operation, by the owner at his expense, No statement contained in this Chapter shall be construed as preventing any special agreement or arrangement between the City and any industrial concern whereby an indust:al waste of unusual strength or character may be accepted by the City for treatment, subject to payment therefor by the industrial concern. 8.5-13: AL4ZMOLES: When required by the Utilities Engineer, the owner of any ` property served by a building sewer carrying indus- trial wastes shall install a suitable control, manhole in the building sewer to facilitate observation, sampling and measurement of the wastes. Such manhole, when required, shall be accessibly and 8-5-14 8-6-1b £ safely located, and shall be constructed in actor- dance with lans ap proved pproved by the Utilities Engi- system, users shall be charged by one of the neer. The manhole shall be installed by the owner two (2) following methods: at his expense and shall be maintained b him so as to be safe and accessible at all times. (Ord. single-family residence twelve dol- 1552, 6-12-56; amd. Ord. 2847, 5-6-1974) lars twenty. nine cents per month. b. For other than single-family dwellings, the 8-5-14: EXAMINATION OF WATER ANI) SEWAGE: Planning/Building/Public Works Admin- iatrator shall install a water meter into such - private water system at cost to, property own- characteristica of water ers,analyses and the method of billing shall be in com- Pliance with Section 8-6-16A2 of this Title. and avast to which reference is made in this Chapter shall be (Ord. 4567, 12-11-95 ) determined in accordance with standard methods' for the examination of water B. Separate Sewer Exempt Meter: Whenever and sewage, and shall be determined at the the use of water is such that a portion of the con- trol manhole, or upon suitable samples taken P water used does not flow into the City sewer at said control manhole. In the event that system but is lost by evaporation or used in no special manhole has been required, the con- q trol manhole shall be considered to be irrigation, manufacturing or any other use, and the person in control provides proof of the nearest downstream manhole in the public this fact such person may apply for he installation 71 sewer to the point at which the building sewer is connected, of a separate sewer exemptmeter to measure the amount of water so used or lost and no charge shall be made for B. The Utilities Engineer and other duly autho- sewage because, of water so used or lost. A rized employees' of the City bearing pro per credentials and identification shall be sewer exempt meter application will be made in the same manner as a regular water meter I'S per- witted to enter upon all;: properties for the purposes of inspection, installation. All sewer exempt meters shall be located at the property line or adjacent`to observation, measure- ment, sampling and testing, in accordance the regular meter; provided, howeveran , with the provisions of this Chapter. (Ord. evaporation exemption may be to gl 1552, 6-12-1956; sand. Ord. 2847, 5-6-1974) coin -operated and commercial laundries without the installation of a submeter. Such exemption shall be an eleven percent (11%) 8-5-15: SEWER CHARGES: reduction in chargeable water consumption for commercial and industrial laundries i f A. Disposal The monthly `Rates: : rates and charges for sewage disposal and a three percent (3%) reduction in chargeable water consumption for coin -operated laun- service shall be as follows; dries. (Ord. 3055, 8-9-1976)G' 1. Single -Family: Twelve: dollars twenty nine cents'($12.29). C. Service Outside Of City: Upon application made to the City Council, requests for indi- vidual sewer service outside of the City limits 4 2 All Other Users: A base charge of one dot- g will be evaluated on a case -by -case basis. The }` lar eighty seven cents ($1.87) plus one dollar City Council will consider and may allow san- itary sewer to thirty nine cents ($1.39) per month for each hundred (100) cubic feet of water used, for service ;properties outside the City's corporate limits when no other reason- a minimum charge of twelve dollars twenty nine cents;($12.29) per month, able service is available and it is in the City s best interest. Consideration will be given to the following factors: 3. Charges For Sewer Service Without City Water: In the event that water obtained from sources other than purchased from the City is either discharged or drained into the sewer 1. These rates shall become effective with billings computed on or after January 1 of the year the bud- get is adopted. City of Renton 397: 8-5-15 1. Public Entity: The applicant is a Munici- pal or quasi -municipal corporation including school, hospital or fire district, County of King or similar public entity; or 2. Necessary, Service: Service is necessary to convert from'a failing or failed septic system and the property owner executes an agree- ment by which the owners, their heirs, suc- cessors or assigns, agree and covenant to sign a petition to annex the property into the City; or 3. Drinking Water: Service is necessary to protect the City's drinking water supplies; or (Ord. 4343, 2-3-1992) 4. Design Standards: a. The property to be served is within a drainage basin where service can be provided withgravity flow via the existing Renton sewer system, the .property is not within a sewer service district that has service avail- able through,' existing or gravity extension of existing facilities, and the property owner executes an agreement by which the owners, their heirs, successors or assigns, agree and covenant to sign a petition to annex the prop- erty into the City. b. The Planning/Building/Public Works Department mandates design standards and criteria for the property(ies) requesting ser- vice : without annexation. King County Boundary Review Board approval of service and service; agreements with adjacent dis- tricts will be obtained, when necessary, prior to issuance of the public works permit. The property owner will obtain and pay for all required permits, including but not limited to City`side sewer permits and County right-of- way permit (if necessary). The property own- ers will be responsible for their fair share of the cost of the installationofthe sewer main either through direct costs or latecomer's assessments., - c. The rates to such special users shall be one and one-half (1-1/2) times the basic City rates applicable to resident users for similar services plus any monthly fees levied by Metro except that such exemptions and dis- counts as provided in Sections 8-5-15D4, 8-5- 15D5 and 8-4-32 shall likewise apply to these rates. (Ord. 4467, 8-22-1994) r' 397 c. 8-5-15 D. Additional Charges: In addition to the forego- ing charges specified in this Section, the fol- lowing rates shall be charged: 1. A charge of nineteen dollars ten cents ($19.10) per month payable to Metro for each single-family dwelling unit. 2. A charge of nineteen dollars ten cents ($19.10) per month payable to Metro for each seven hundred fifty (750) cubic feet, or any fraction thereof, of water used for all users other than single-family. 3. Any additional charges hereafter imposed by Metro under the "Industrial Cost Recovery" or "Industrial Waste Surcharge" programs required under the FWPCA (PL 92- 500), section 204, or as same may be amended hereafter, plus fifteen percent (15%) thereof as an additional charge for the City's cost of implementing such programs. 1. T com get 4. Senior and/or disabled citizens who quali- fied under Section 8-4-31C for low-income rates prior to August 1, 1994, are eligible for the following rates: a. Nineteen dollars ten cents ($19.10) per month for Metro sewer, and one dollar five cents ($1.05) per month for City sewer charges for a seventy five percent (75%) rate subsidy and two dollars ($2.00) per month for City sewer charges for a forty percent (40%) rate subsidy. b. Senior and/or disabled citizens who " qualify under Section 8-4-31C for low-income rates after August 1, 1994, are eligible for the following rates: (1) Nineteen dollars ten cents ($19.10) per month for Metro sewer and three dollars fifteen cents ($3.15) per month for City sewer charges for a seventy five percent (75%) rate subsidy, and seven dollars forty cents ($7.40) per month for City sewer charges for a forty percent (40%) rate subsidy. (Ord. 4567,'12-11 1995; amd. Ord. 4643, 12-9-961) hese rates shall become effective with billings puted on or after January 1 of the year the bud- s adopted. City of Renton I 8-5-16 (2) For double occupancy households, six dollars ninety cents ($6,90) per for households with incomes be- month tween thirty six percent (36%) and forty seven percent (47%) of the median household income for the City. (3) Fifteen dollars ninety cents ($15-90) ti per month for Metro sewer charges. (Ord. 4461, 7-25-1994) 5. For those senior citizens, sixty two (62) years of age or older and/or disabled citizens, when such seniors and/or disabled citizens are not otherwise eligible for special rates as low-income seniors and/or disabled citizens, but who qualify for property tax exemption pursuant to RCW 84.36.381.5(a) and are not residents of the City shall be exempt from the fifty percent (E;O%) utility surcharge applica- ble to those customers not residents of the City and shall be exempt from the necessity to execute an agreement to annex to the City under Section 8-5-15C4a. To receive this exemption the applicant must provide the information required under Section 8-4-3 1C2. (Ord. 4481, 11-28-1994) E. Installation Of Sewage Meter: Whenever the use of the public sewer is such that infiltra- tion and/or inflow is evident from a private where sewage facility, or a building sewer, the sewer flow is two (2) times in excess of the daily metered water, the Utilities Engi- near shall install a sewage meter and charge the regular monthly rates and charges for customers in that class, for all infiltration and inflow and sewage that it discharged into the public sewers. All costs and expenses incident to the installation and connection of the sewer meter shall be borne by the owner or applicant of the premises in question. (Ord. 3056, 8-9-1976) F. Rate Revenue For Capital Purpose: A portion of the revenue generated from the above be for sewer utility related rates will used capital improvement projects and/or debt ser vices for the same as indicated in the adopted budget. Also included in the above rates are applicable State and local taxes. G. Penalty And Late Charges: Penalty and late charges shall be the same as in Section 8-1- 8AIb. (Ord. 4253, 12-11-1989) City 8-5-16 8-5-16: BILLINGS AND COLLECTIONS: A. All bills for sewer disposal service as set forth in this Chapter, or as same may be amended from time to time, shall become due and pay- able at the office of the Finance and Informa- tion Services Administrator, or such other place as the City may designate, not later than twenty five (25) days from date of bill- ing. If the charges billed are not paid within the twenty (20) day period from the due date, such charges shall become delinquent. Once the charges become delinquent, there shall be added a late fee of ten percent (10%) of the past due charges but not less than fifty cents ($0.50) to compensate the City for handling the past due account, subsequent billings and any collection action taken. B. If customers' sewer bills are not paid by the due date (25 days from the date. of billing) they will receive a mailed shutoff notice stat- ing that if their accounts become delinquent because of nonpayment after forty five (45) days from the date of billing the Plan- ning/Building/Public Works Department will be directed to cut off the water service to the premises and enforce the lien upon the prop- erby to which service has been rendered, and such lien shall be superior to all other liens or encumbrances except those for general taxes and special assessments. Such liens may be foreclosed by the City in the manner provided by law for the enforcement of the same, and for delinquent sewer charges, in addition to all other remedies provided. There will be an sum of twenty dollars ($20.00) additional charged for the expense of turning the water off and on when all charges to the City plus penalties have been paid, (Ord. 4460, 7-18- 1994) C. In lieu of any notice by mail the Utilities Engineer or the Finance and Information Services Administrator, or their duly autho- rized representatives, may cause a delin- quent sewer charge notice to be served upon such user or occupant. Fail- personally to receive mail properly addressed to ure user or occupant shall not be a valid such defense for failure to pay any such delinquent charges. Any change in ownership of property or change in mailing address must be prop- erly filed, in writing, with the office of the Finance and Information Services Adminis- 397 of Renton fi. 8-5-17 8-5-17 trator within fifteen (15)-days after such a. Single -Family: Five hundred eighty five dollars ($585.00) per single-family resi- r S a ' change of status. (Ord. 4293, 10-15-1990) deuce. 8-6-17: CH.ARGES'FORR PROPERTY NOT b. Mobile/Manufactured homes: Four hundred sixty eight dollars ($468.00) per „r !.' pREVIOUSLYASSESSED: dwelling unit located in mobile home parks charge imposed shall and manufactured home parks. A. The special connection Cu- be paid' into the Waterworks Utility Con- Multi -Family: Three hundred fifty dol- ` struction Fund. (Ord. 4205, 2-20-1989) c. lars ($350.00) per multi -family residence, s The charge shall be paid in cash whenever and except in the Center Downtown zon(CDed Center Office/Residential (COR) zoned areas - such connection is requested. (Ord. 4415, 8- shall be assessed in accordance with 16-1993) which subsection B3d. Mixed use buildings with B. In addition to sewer connection permit fees over fifty percent (50%) of the floor apace for multi -family residences shall be ' as required ordinance and the rules and used at the rate of three hundred fifty regulations promulgated thereunder, there is and the owners of assessed dollars ($350.00) per multi -family residence. ` herebyimposed upon, properties which have not previously been d. Other: For all other properties except t assessed or charged or borne an equitable share of the cost of the City's sewer distribu- City properties, seven point eight cents square foot of property connected tion system shall pay, prior to any connection to City sewer main, one or more of four (4) 0.078) per but not than five hundred eighty five dol- a special connection charges, herein defined, in lore($586.00). an amount to be computed under the follow- e. Payment: Fees are incurred upon the ing subsections of this Section. (Ord. 4205, 2- granting by the City of a building permit or a 20-1989) construction permit, but are payable at the 1. Latecomer Fees: The imposition, collec- time construction permits are issued for con- nection to or extension of the public sewer; or fics tion, payment, and other speciconcerning are detailed in Chapter 5, Title DX in the absence of the requirement for a this charge of this Code. 2. Special Assessment_ Charge: The special assessment charge is a charge for the histori- cal costs for the sewer collection system, which system shall include the sewer collec- tion mains that lie adjacent to or near proper- ties that would benefit directly therefrom, that'were not installed by LIN or be a nt. vate developer under a latecomer agreement. The 'imposition, collection, payment, and other specifics concerning this charge are detailed in Sections 9-16-6, 9-16-7 and 9-16-8 of this Code. (Ord. 4505 4.10-1995) 3. System Development Charge: The system development charge which shall be assessed against any property which has not partici- pated in the development of the sewer sys- { tem, which system shall include lift stations, force mains, interceptors and other collection mains, shall be assessed at the rate of. k t 397 City of Renton 8-5-17 public works permit, then at the time of granting the building permit. All other sani- tary sewer service applicants shall pay these fees at the time of building sewer applica- tion. f. Fees Upon Sale: Fees are due immedi- ately if the party owing the fee sells to a third party, unless the third party agrees to pay the charge, in writing, with the amount owing to the City -set forth in that writing, and further the City agrees that the third party shall be responsible for that fee after determination that such an agreement would be in the City's best interest. The burden of establishing the agreement would be on the party owing, the fee and not on the City, and would be in the City's best interest. g Definition: When the phrase "property which has not participated in development of the ;:system" 'is used in this Section, it shall mean any, of the following: (1) First Time Sewer Connection: Any property whichhas not paid a system development charge for the property based upon the square footage of the property and which is connecting to Renton's sewer system for the first time (including but not limited to new con- struction, or conversion from septic system). (2) Further Development Or Subdivi- sion: Any property which has not paid a system development charge for the property based upon the square footage of the property that is to be served by the utility and is developing or subdi- viding further. For example, one single- family residence on a five (5) acre tract which has paid five hundred eighty five dollars ($585.00) under this Section to connect to a sewer system will have paid only for one, seven thousand five hundred (7,500) square foot lot at the rate of seven point eight cents ($0,078). Additional charges would be applied to any additional development on the property at the time of development. City of Renton 8-5-1'7 (3) Larger Or Additional Water Meters: Any property which has not paid a system development _ charge for the property based upon the square footage of the property that is to be served by the utility and that requests or requires a larger or additional domestic water meter(s) will trigger a system develop- ment charge. (4) Redevelopment Credit: An option exists for receiving a redevelopment credit for property which has not previ- ously paid in full a system development charge. A redevelopment project that requires a larger water meter, or addi- tional domestic water meter(s), will trigger the sewer utility system devel- opment, charge. However, any parcel that currently has water service is eligible for a prorated system develop- ment charge. This prorated develop- ment charge is based on the, following formula: (Proposed domestic meter(s) capacity in gallons per minute (GPM) - Existing domestic meter(s) capacity in GPM/Proposed domestic meter(s) capac- ity in GPM) x SDC Fee = Amount owed. Fire flow meters are not included in this calculation. For example, a redevelopment project that involves a change' from a "single- family home on a ten thousand (10,000) square foot lot with a five -eighths inch by three-quarter inch meter (Ve' x s/,", a standard single-family meter) that has a safe operating capacity of twenty (20) gallons per minute (GPM), to a four (4) unit multi -family dwelling with a one and one-half inch (1'/2') meter with a safe operating capacity of one hundred (100) GPM can apply to pay for the following prorated charge: (100 GPM - 20 GPM/100 GPM) =,0.8 0.8 x (10,000 sq. ft. x_$0.078/sq. ft.) $624.00 995 8-5-17 Without the redevelopment credit, this project would have paid $0.078/sq. ft. x 10,000 sq. ft. = $780 00 The City will determine the safe maxi- mum operating capacities of all meter sizes using American Water Works Association tables (see Chapter 4 of this Title). The fee paidshall be recorded and applied to the total system develop- ment charge applicable for the parcel. Reduction in water meter capacity shall not result in a payment from the City to the applicant. (5) Fire Protection Credit: Installation of a water meter solely for a fire protec- tion system, such as a new hydrant or fire sprinkler system shall not trigger a sewer system development fee. h. Short -Term Use: Temporary connections to the City's sewage system may be granted for a one-time, temporary, short-term use of a portion of the property for a period not to exceed three (3)'consecutive years. Permis- sion for temporary connection may be grant- ed upon' payment of an annual 'fee equal to ten percent (10%v) of the current system de- velopment charge applicable to that portion of the property; but not less than seven hun- dred fifty, dollars ($750.00) per year. Said fee shall be paid annually (nonprorated), and shall be nonrefundable, nontransferable (from one portion of the property to another) and shall not constitute a credit to the sys- tem development charge due at the time of permanent use of the utility system. The application for temporary connection shall consist of a detailed plan and a boundary line of the proposed development service area for use in the fee determination. - i. City -Owned Property: No system devel- opment charge will be collected on City - owned properties. The benefits to the utility from the use of other City properties such as utility easements, lift stations and other benefits offset the -amount of the system development charge, 996' 8-5-17 S j. Limited Exemptions: A limited exemp x tion to the system development charge will be granted to Municipal corporations for portions of property subject to the system j development charge to the extent that those specific areas available and maintained at all times for public use (e.g., ballfields adjacent to a school building) shall be segregated from the fee determination as herein provided. In applying this exemption to the extent possi- ble, a single straight line shall be drawn across the property separating the exempt property from the property to be charged. If a single straight line would not achieve sub- stantial equity, then additional lines may be drawn to include substantial open space areas in the exemption. For purposes of this exemption, substantial open- space areas shall be at least one hundred thousand (100,000) square feet in area. Lines shall not be drawn closer than fifteen feet (15') to any structure. (1) Nonexempt Areas: Parking lots, driveways, walkways, similar areas and required landscape areas shall not be City of Renton part of the exempt area. k . ' (2) Administrative Fees: The applicant ' shall pay the City's administrative costs for the preparation, processing and recording the segregated fee. At the time of application` for system develop- ment charge segregation the applicant shall pay the administrative fee of sev- en hundred fifty dollars ($750.00). (3) Restrictive Covenants: The exemp- tion must be memorialized by means of a restrictive covenant running with the land. Should the property exempted under this Section later develop, then that property shall pay, the system development charge fee in place at the time of development. (4) Interpretation Of Partial Payment: The Administrator of, the Plan- ning/Building/Public Works Department shall make the final decision on the 8-5-17 interpretation of this limited exemption and the achievement of substantial equity. k. Calculation Of Charge: When calculat ing the area to be charged the System devel- opment charge, undeveloped greenbelt and major easements within the property shall not be included in the square footage for the calculation of the charge. When determining whether property is undeveloped greenbelt or major easements, the inquiry should be to recorded easements or dedications or restric- tions.on the Comprehensive Plan or zoning maps or City policies that would prevent development of significant usages. This ex- emption is intended not to charge property that is undevelopable. 1. Exemption For Wetland: When calculat- ing the area to be charged the development charge, Class I and II wetlands are exempt. It is the responsibility of the property owner or applicant to submit a study determining the classifications as Class I and/or II wetlands and a legal description of said wetlands so that these portions of the prop- erty can be exempted from the development charge: Classification of wetlands will be based upon the rating system as outlined in Chapter 32, Title IV of this Code and any subsequent amendments thereto. m. Segregation Criteria: The ability exists develop- for the segregation of the system develop - ment charge in the partial development of a large parcel of property. This segregation shall be based on the following criteria and rules: (1) Segregation By Plat Or Short -Plat: The system development charge shall be determined on the basis of the spa- cific platted properties being developed regardless of the parcel size. Unplatted or large platted parcels may be platted or short -platted prior to development, in which case the system development charge will be applied to the specific platted lots being developed. 8-5-17 n. Partial Payment: The ability exists for the partial payment of the system develop- ment charge based erceritage of the upon p property developed. The owner may apply for partial payment of the fee on a percentage - based prorated basis proportional to the percentage of the parcel which will be devel- oped. The application shall consist of a de- tailed plan, drafted to current adopted City standards, of the proposed development, which shall include a proposed boundary line for the system development charge fee deter- mination, and a statement of the total area of the property and the area of the developed portion in square feet. The following criteria shall determine the partial payment of fees: (1) Application Of Provisions: This pro- vision shall apply to all developments with the exception of single-family resi- dential and mobile home developments. (2) Determination Of Charge: The Bys- tem development charge shall be deter- mined on the basis of the percentage, of a property that is developed (existing development plus proposed develop- ment). 4 , (3) Full Development: For the purpose of this Code, full development is consid- ered to be sixty percent (60%) property coverage for multi -family development and eighty percent (80%) property cov- erage for commercial, industrial, mixed use, and all other development. "Prop-, arty coverage" is defined as the portion of the property supporting buildings, driveways and sidewalks, parking ar- eas, grass and landscape areas, public access areas, storm drainage facilities and detention ponds, and improvements required for mitigation of environmen- tal impacts under the State Environ- mental Policy Act (SEPA). (4) Developed Area: The "developed area" shall include, but not be limited to, all contiguous existing developed ped land for which the system development charge have not been paid: all existing and proposed buildings, driveways and 995 City of Renton w..✓ .i 1. 8_5.18 8-5-17 i recording of the partial payment of the a+ ` tt sidewalks, parking areas, grass and landscape ;areas, public access areas, fee. At the time of application for sys- tem development charge fee partial r� F storm drainage facilities and detention and improvements required for p payment the applicant shall pay the tr ponds, mitigation of environmental impacts administrative fee of seven hundred fifty dollars ($750.00). under the State Environmental Policy Y " w. Act (SEPA). (8),Interpretation: The Administrator of +'= ;' ' (5) Formula: Determination of partial the Planning/Building/Public Works Department shall make the final deci- payment shall be performed dividing sion on interpretation of the partial Y the "developed area" by eighty ,percent (80%) (60 percent for multi -family de- payment of system development charg- a; velopment) of the total areaoftheprop- es. .;G erty, and multiplying this number by the sewer system development charge o. Request For Agreement: Any party ex- `) Fee assessment for the entire property. tending utilities that may serve other than request a ; that party's property may latecomer's agreement from the City. Any 4 ,t{r (6) Partial Payment Fees: party required to oversize utilities may re- ' (A) The partial payment of Fees quire that the utility participate in the cost a shall be by formal, written agreement of the project. i'. which shall be recorded as a restrictive covenant running with the land. The p.Inspection And Approval Fees: In.addi- ti r„ s r- restrictive covenant shall list the per- tion to other permits and fees; there will be an inspection/approval fee for on -site and off - tit centage of the system development charge fee that has been paid for the site replacement and improvements which property. The percentage of the system Shall be identical to that specified in Chapter 10, Title IX and any subsequent amendments ` f 1 development charge fee that has been thereto (see Section .9-10-3B of this Code). vr, paid for the property Shall be defined by dividing the "developed area" by eighty (Ord. 4525, 6=12-96) t . percent (80%).: (60 percent'. or multi -family development) of the total 4. Oversize Utilities; Participation in Coet: a +r; area of the property, and multiplying Any party extending utilities that may serve other than that party's property may request 4 this number by one hundred percent a latecomer's agreement from the City. Any y (100%). party required to oversize utilities may re- i (B) Should the property partially quest that the utility participate in the cost paid for under this Section later Bevel- of the project. (Ord. 4415, 8-16-93) - s ` op, then that property shall pay the system development charge Fee in place 5. Inspection And Approval Fees: In addition at the time of development. Should the to other permits and fees, there will be an inspection approval fee for on -site and off - ' property .partially paid for under this Section later be subdivided, then the site replacement and improvements which partial payment credit shall run with shall be identical to that specified in Chapter 10, Title IX and any subsequent amendments •, the subdivided lots. The burden of es- 'tabliehing that the partial payment has thereto (see Section 9-10-3B.of thieCode). +4�y + " been made would be on the party owing (Ord. 4205, 2-20-89) the fee and not on the City, r (7) Administrative Fees: The applicant 8.5-18: PUBLIC SEWER EXTENSION: Ex- tensions to the public sewer may be 'f shall pay the City's administrative coats for the preparation, processing and permitted by developer extension agreements. The tY 995 City of Renton Utilities Engineer shall prepare "Conditions and Standards for Construction of Utility Developer & Extension" All developer extensions shall abide by these standards, These standards shall be updated and modified, from time to time, in accordance with good, effec- tive practices, the "Standard Specifications for ' Municipal Public Works Construction of the Amer- ican Public Works Association" and to the "Recom- mended Standards for Sewage Work". (Ord. 3055, 8-9-76, eff. 7-1-76) 8-5-19: PUBLIC SEWER SPECIFICATIONS: lr A. Compliance: Public sewers shall conform to the latest standards of the City, as adopted by City Code, and to the "Recommended Standards for Sewage Works" of the Great Lake >- Upper Mississippi River Board of State Sanitary Engineers, and are subject to review by the Department of Ecology of the State. B. Materials: The public sewer shall be ductile iron, AWWA C 151, with Type II push -on or Type III mechanical joints, together with cement mortar lining three thirty-seconds inch,(s/sx') in accordance with AWWA C 104, or polyvinyl chloride (PVC) plastic pipe ASTM: D 3034, or concrete nonreinforced ASTM C14 Class 2, or concrete reinforced ASTM C76; rubber gaskets for concrete pipe shall meet ASTM C443 standards; rubber gasket ,for PVC ;pipe shall meet ASTM1869 standards. However, when public sewers are installed in filled or unstable ground, in areas with high ground water levels, or in areas wherethe potential for': infiltration occurs; may be required to be either ductile iron or PVC plastic pipe, Exact pipe material shall be as determined ` by the 'wastewater utility. Minimum size shall be eight inches (8 ") diameter. C. Manholes: 1. Manholes shall be installed at the end of " each line, at all changes of grade, size or alignment, at distances no greater than four hundred feet (400') for fifteen + inch (15") E City of Renton 8-5-19 diameter sewers or smaller, Greater spacing may be permitted in larger sewers. Manholes shall be a minimum of forty eight inches (48") in diameter, shall be precast concrete or cast in place concrete, with steel reinforce- ment; steps shall be placed at one foot (V) spacing, conforming to current safety regula- tions. 2. The manhole covers shall be twenty four inches (24") in diameter cast iron frame and covers. All connections to the manhole shall match the existing inverts or have a drop connection in accordance with the current City standards. Lift Stations: All lift stations that are to be turned over for public maintenance as well as private lift stations for commercial or multi -family building sewers shall have alarm and standby, emergency operation systems, and meet or exceed Department of Ecology specifications as detailed in "Criteria for Sewage Works Design". All private single- family lift stations shall meet or exceed the current City standards for that type of facili- ty. Sanitary Sewer Mains: All persons or local improvement districts desiring to install sanitary sewer mains, as an extension of Renton's sewer system, must extend said mains under the supervision of the wastewater utility. All installations shall extend to and across the full width of the property served with sanitary sewer except when it is shown by engineering methods, to ' the satisfaction of the wastewater utility, that future extension of the sewer main is not possible or necessary. If an exemption is granted, the property owner is not relieved of the responsibility to extend the main and shall execute a covenant agreeing to partici- pate in an extension if, in the future, the wastewater utility determines that it is nec- essary. No property shall be served by City sewer unless the sewer main is extended to the extreme boundary limit of said property as required by this Section. Any facility im- provements identified by the current adopted long-range wastewater management ;plan (comprehensive sewer system plan) that are 995 f '. 8-6-19 not installed or in the process of being in- stalled must be constructed by the property owner(s) or developers) desiring service. All ;public sewer extensions shall conform to the standards and be consistent with the City comprehensive sewer system plan. (Ord. ' 4343,2-3-92) 8-6-20: PENALTIES FOR VIOLATIONS OF REGULATIONS: A. - It shall :be unlawful for any person to mali- ciously, 'knowingly, wilfully r or negligently break, damage, destroy, uncover, deface or tamper with any structure, appurtenance or equipment which is part of the City sewage works.' B. Any person violating any provision of this Chapter or who shall fail to do any act he is required to do under the provisions of this Chapter shall upon conviction be punished by a fine not exceeding five hundred dollars ($600.00) or imprisonment not exceeding six (6) months, or by both such fine and impris- onment. Each day any violation of this Chap- ter shall continue shall constitute a separate offense. (Ord. 3065, 8-9-76, eff. 7-1-76) 8-6-21: ALTERNATES, MODIFICATIONS, APPEALS: A. Alternates: The provisions of this Code are not intended to prevent the use of any mate- rial or method of construction not specifically prescribed by this Code, provided any alter- nate has been approved and its use autho- rized by the department administrator or his/ her designee: 1. The Administrator may approve such al- ternate, provided he/she finds that the pro- posed design is satisfactory and *complies with the provisions of this Code and the material, method or work offered is, for the purpose intended,; at least the equivalent of that prescribed in this Code in suitability, strength, effectiveness, durability, safety, maintainability and environmental protec- tion. 995 B. C. 1a City of Renton 8-6-21 2. The Administratorshall require that suffi- cient evidence or proof be submitted to sub- :.: stantiate any claims that may be made re- garding its use. The details of any action granting approval of an alternate shall be written and entered in the files of the Code enforcement agency. Modifications: Whenever there are practical difficulties involved in carrying out the pro- visions of this Chapter, the Administrator may grant modifications for the -individual cases, provided they shall first find that a special individual reason makes the strict letter of the Code impractical, and that the modification is in conformity with the intent and purpose of this Code, and that such modification: 1. Will meet the objectives of safety, func- tion, appearance, environmental 'protection and maintainability intended by this Code, based on sound engineering judgment, 2. Will not be injurious to other property(ies) in the vicinity, Tests: Whenever there is insufficient evi- dence of compliance with any of the provi- sions of this Codeorevidence that any mate- rial or construction does not conform to the requirements of this Code, the Administrator may require tests as proof of compliance to be made at no expense to this jurisdiction. 1. Test methods shall be as specified by this Code or by other recognized test standards. If there are no recognized and accepted test methods for the proposed alternate, the wastewater utility shall determine test pro- cedures. 2. Suitable performance of the method or material may be evidence of compliance meeting the testing requirements. Appeals: Any decisions made in the adminis- trative process described in this Chapter may be appealed to the Board of Public Works within fifteen (15) days and filed, in writing, with the Board chairman or secretary, The Board of Public Works shall give substantial t