Conformity to all engineering standards and specifications as described herein shall be required prior to approval of a final plat. At the Council’s discretion and after consultation with the City Engineer and the Planning Commission, the engineering standards and specifications may be added to, altered or otherwise changed where there are practical difficulties or unnecessary hardships in the way of strict compliance with the requirements. In the interest of the public health, safety, general welfare and convenience, the Council may change or add to these standards and specifications.
(A) Monuments. All lot corner pipes or steel rods shall be one-half inch in diameter placed flush with the finished lot grade. All quarter corners, sixteenth corners and section corners if encountered within or adjoining a plat shall be duly described and tied and placed in a five-foot deep by six-inch round concrete monument.
(B) Street grading. The grades after approval by the City Engineer shall be graded to full right-of-way width with a six-inch curb, one-half foot rise above the curb to the property line and a slope of three to one from the property line to natural ground. A sub-base and base for road or plant mix surfacing shall be established for a seven-ton minimum load which is equal to a ten-inch base.
(C) Street surfacing. A surfaced road shall be required for all streets and alleys. The width of the surfaced street shall be determined by the City Engineer and be in conformity with the city’s Major Street Plan. A hot plant mix specification as prescribed by the City Engineer and approved by the Council shall be required. The road mix base shall be a minimum of one inch and the leveling and wearing courses shall be a minimum of one and one-half inches each.
(D) Curb and gutter. Integral concrete curb and gutter with a six-inch curb and 24-inch gutter, six inches thick, shall be required. Intersection radius of curb shall be varied to street curb width.
(E) Sidewalks and pedestrian ways. Concrete sidewalks shall be five feet wide and four inches thick placed on a four-inch gravel base. All pedestrian ways shall be concrete the full width and shall conform to sidewalk requirements. Sidewalk grades shall coincide with street grades and slope one-fourth inch per foot from property line. Sidewalks shall be placed in the street right-of-way at the property line.
(F) Water main. A minimum water main of six-inch cast iron pipe or approved equal shall be required wherever feasible. Mains in size over six inches shall be installed as indicated on the city’s utility plans. Community water shall be permitted if at no expense to the city; provided that, the system is approved by the Council.
(G) Sanitary sewer. A sanitary sewer of eight-inch vitrified clay pipe or approved equal shall be required as minimum size placed at not less than 0.3% grade, except for a dead end section where a 0.4% minimum grade shall be required. House service wyes shall be four inches. Root repellent joint material and yarns are required. Double wyes are not permitted. All sewers must be inspected by a City Inspector before backfill is displaced.
(H) House services. Each house service shall be run from the main to the property line where a cap or plug shall be placed until the service is extended to the house. A three-fourths inch copper water service, corporation cock and curb box and stop and four-inch extra heavy cast iron soil pipe sewer service shall be minimum requirements and may be placed in a common trench. All materials used shall be in accordance with specifications as required by the Plumbing Inspector and all plumbing shall be inspected before gravel backfill is implaced.
(I) Individual wells. An individual well shall produce at least five gallons per minute and shall be cased or grouted to provide a safe, potable water supply. A pressure tank equal to ten times the well capacity is required.
(J) Individual sewage systems. Each individual system shall include a septic tank at least 900 gallons in capacity followed by an absorption system based on Public Health Service minimum standards. All percolation results shall be filed with the City Clerk showing that a competent soils engineer conducted the field tests. The minimum lot area required for septic tank use shall be as determined necessary by the City Engineer. Soil samples shall be provided by the subdivider.
(K) House plumbing. When individual well and septic tanks are used and the septic tank is placed at the rear of the house, it shall be required that plumbing be extended from the vent stack of the rear outlet to a point five feet beyond the basement footing and capped. Inside the basement, the vent elbow shall be set up to be easily reversed for connection to the capped line. The basement slab shall be scored for easy removal to include an area three feet square.
(L) Drainage facilities. All surfaces and underground drainage systems shall be installed to adequately remove all natural drainage that accumulates on the developed property. Where a master plan or storm sewer district has been established, the drainage network shall conform to the adopted plan. All piping shall provide complete removal and a permanent solution for the drainage water. Open ditches are to be avoided if at all possible.
(M) Street signs. All street signs shall be installed by the city.
(N) Inspection. All improvements required on site, as described under “engineering standards”, shall be inspected during construction by the City Engineer at the expense of the subdivider. This inspection shall include aggregate samples, bituminous mix samples, concrete samples and visual inspection of projects during the installation of work.