The site plan requirements for single, two and three-family dwellings shall include the following:
(a) The plan shall show the existing topography of the lot and adjacent land and buildings. The site plan shall also show the proposed finish yard elevations at points indicated, proposed finish floor elevations, proposed basement floor elevation, proposed drainage swales, driveway, driveway catch basin, walks, building storm sewer, sanitary sewer, waterline, electric service line, telephone service line, rear yard basin, when required, and any other utilities. If the lot is in a development or subdivision, this plan shall be in addition to the mass grading plan and the existing elevations shown shall be those elevations as existing at the time of application for building permit. The final lot grading shall be in general conformance with the surrounding lots and mass grading plan. An elevation at the building setback line shall show the front elevations of the house in relation to the existing or proposed grading of the adjacent lots and their houses either existing or under construction. In addition to the elevations shown, the plan shall also show the existing and proposed contours at one foot (1') intervals. For large size lots, the existing elevation and contours need not be shown more than one hundred feet (100') beyond construction limits and the required sheet size of the plan may be larger.
(b) The lot grading plan shall follow the following minimum criteria:
(1) Wherever possible, each lot shall be graded so that the front yard slopes toward the street and away from the house. Side yard swales located between houses shall be constructed and maintained to a minimum depth of six inches (6") below the finish grade of the lowest house and shall be deep enough to drain properly to the rear or front yard. An increase in the minimum swale depth may be required to accommodate storm water runoff from larger lots or drainage areas.
(2) Where the rear yard slopes toward the house, a swale shall be constructed at least twenty feet (20) from the rear of the house to a minimum depth of six inches (6") below the finish building grade of that house and shall drain to the side yard swales. An increase in the minimum swale depth may be required to accommodate storm water runoff from larger lots or drainage areas.
(3) In a case where lots behind the subject lot are higher in elevation and the rear yards of the higher lots slope toward the rear of the subject lot, swales on the lower lot or lots shall be constructed along the side lot lines with an average depth of six inches (6") below the lowest adjacent lot surface at the building and shall extend from the front lot line to the rear lot line.
(4) Where the rear yards slope toward the rear of the lot and the method of grading described above is not possible, a catch basin shall be constructed in a swale along the rear lot line. In subdivisions, the maximum distance between catch basins along the length of any such rear swale shall be two hundred feet (200'). Catch basins shall be constructed during the development phase. Each such swale and catch basin shall be maintained by the property owner to ensure effective and total storm water control. In a development, the center of the swale may be along the property line and in any other case it shall be at least six feet (6'), but not more than ten feet (10'), onto the property being developed and a minimum of six inches (6") below the lower property.
(5) For additions to existing dwellings and for detached garage construction on an existing site, drainage shall be maintained in accordance with the above.
(6) No yard slope shall exceed a one foot (1') rise vertically for a five foot (5') horizontal distance when possible. Exceptions shall require the approval of the City Engineer.
(c) All sanitary sewer house connections shall be indicated on the site plan as follows:
(1) From the curb connection to the front of the dwelling or to the individual waste water system, if approved.
(2) If a central collection system (street sanitary sewer) is to be used, the elevation of the invert of the nearest manhole and the elevation of the curb connection invert shall be shown. If an individual waste water system approved by the Summit County Board of Health is to be used, the permit from Summit County shall be attached.
(3) The site plan shall show both the test tee location and the invert location at the front of the building. For slab construction, the test tee shall be no more than five feet (5') from the foundation of the residence. Invert elevation shall be below the footing. A test tee shall also be placed at the right-of-way line.
(4) The grade of the house connection shall be a minimum of one percent (1%).
(5) The following shall not necessarily be shown on the plan, but shall be required construction:
A. Pipe materials for this main line from the curb connection to the front of the house shall be six inches (6") (PVC) sewer pipe SDR 35 ASTM D 3034 with gasketed joints meeting the requirements of D 3212.
B. All sanitary or storm laterals, waterline, gas, telephone and cable T.V. connections shall not be located under driveways unless approved by the City Engineer. Additional cleanouts are required on all sanitary lateral connections, where there is any change in direction that requires the use of a 45 degree bend or larger. Forty-five degree sweep bends may be used to avoid a cleanout. Two on one connection will not be allowed.
C. Bedding for PVC pipe shall consist of material extending the diameter of the pipe in all directions of No. 67 or No. 8 crushed gravel or stone. A larger stone may be required in the base material if poor ground conditions are encountered.
D. The foundation shall contain two (2) five-eighths inch (5/8") round steel reinforcing rods where it crosses the sanitary sewer trench.
E. All garages shall have a drain with a twelve inch (12") diameter opening with a twenty-four inch (24") depth with a three inch (3") minimum cleanout area on a six inch (6") concrete base connected to the sanitary sewer.
(d) All storm sewer house connections shall be indicated on the site plan as follows:
(1) From the curb connection or outfall point to the front of the dwelling and showing the location of the test tee, driveway catch basin, downspout system, yard drains, and invert elevations.
(2) If a curb connection exists, the invert elevation of the nearest manhole and the invert of the curb connection shall be shown. If a ditch or other "outfall" discharge point is proposed to be used, the invert of the ditch or other discharge point and the proposed invert elevation of the storm sewer house connection shall be shown. If the storm sewer is located at an elevation higher than the footer, a sump pump with a battery back-up shall be installed inside the basement to discharge into the storm sewer.
(3) Any storm water accumulating in the basement area during construction shall be pumped using a dewatering bag to trap sediment, or otherwise directed into the storm sewer system.
(4) The grade of the connection shall be a minimum of one percent (1%).
(5) The following shall not necessarily be shown on the plan, but shall be required construction:
A. Pipe materials for the main line from the curb connection to the front of the house shall be six inches (6")(PVC) sewer pipe SDR 35 ASTM D - 3034 with gasketed joints meeting the requirements of ASTM F 477 and D 3212 and installed per ASTM D2321.
B. PVC pipe shall consist of bedding material extending the diameter of the pipe in all directions of No. 67 or No. 8 crushed gravel or stone. A larger stone may be required in the base material if poor ground conditions are discovered.
C. Additional cleanouts are required on all sanitary lateral connections where there is a change in direction that requires the use of a 45 degree bend or larger. Forty-five degree sweep bends may be used to avoid a cleanout. Two on one connection will not be allowed.
D. 1. Footer drains shall be a minimum of four inches (4) PVC sewer SDR 35 conforming to ASTM 3034 using the same joint requirements as the lateral connections or a solvent weld installation.
2. Footer drains shall be backfilled with No. 57 gravel or washed stone to a height of thirty-six inches (36") over the pipe on full depth basements, twenty four inches (24") over the pipe on half depth basements and fourteen inches (14") over the pipe on slab construction with footers. The perforated holes shall range from 1/4 to 3/8 inches in size and location and volume areas shall follow normal approved underdrain standards. Perforating holes shall be on the bottom portion of pipe. Footer drains shall connect to the house storm sewer connection. Cleanouts on each side of the home shall be installed into the underdrain system.
E. 1. A downspout drainage system and yard drainage system shall be constructed and connected to the house storm sewer at a double "wye" branch provided in the house connection at a point a minimum of ten feet (10') downstream from the point the footer drain connects. If a rear yard drain is planned to be connected, the pipe size shall be a minimum of six inches (6"). The pipe size for roof discharge drains and driveway catch basins shall be a minimum of four inches (4"). Joint shall be the same as lateral connection on a solvent weld installation. If the downspout drainage system is installed over basement excavation backfill, a rigid polyvinyl chloride pipe ten inches (10") or larger with sealed joint gasket shall be used, meeting the requirements of PVC sewer pipe 35 ASTM 3034. All drainage systems shall have thirty-six inches (36") of cover measured from invert of pipe system.
2. Bedding shall be installed totally around all drainage systems extending the diameter of the pipe in all directions. Bedding material shall be No. 67 or No. 8 crushed gravel or stone.
F. 1. In front of each garage, a catch basin, not less than ten inches (10") in diameter, or less than thirty inches (30") deep shall be installed in the driveway and connected to the storm drainage system when the driveway does not slope to the street.
2. For driveways of dwellings which are three feet (3') or more below the level of the street at the garage floor level a trench drain may be required by the City Engineer across the full length of the garage door and not less than twelve inches (12") from the face of garage door.
G. The minimum grade of the downspout drainage system and the yard drainage system shall be one percent (1%).
H. The water supply line from a central system shall be separated from the sewer systems by a minimum of eighteen inches (18") on undisturbed ground. This may be in the same trench at one side of the sewers on a bench of undisturbed earth.
I. All street sidewalks in front of the house shall be a minimum of four feet (4') wide and be constructed of a minimum of four inches (4") thick Portland Cement Concrete meeting the requirements of the Ohio Department of Transportation Specification (herein referred to as O.D.O.T. Spec.) 608. Crack controls shall be at fifteen foot (15') intervals and score marks shall be at five foot (5') intervals. Where the driveway crosses the walk, it shall be a minimum of six inches (6") thick. Subbase shall be a minimum of two inch (2") thick crushed granular material. Meeting ODOT Specifications O.D.O.T. 304 or No. 57 Limestone.
J. On-site sidewalks shall be a minimum of four inches (4") thick and meet all ADA requirements. On corner lots, sidewalks shall be provided along both street frontages and at the corner shall be extended to the street with a sloped section.
K. Where front yard setbacks are less than one hundred feet (100'), driveway aprons shall be a minimum of six inches (6") thick concrete and 6" x 6" welded wire mesh and driveways shall be a minimum of four and one-half inch (4 1/2") thick concrete with 6" x 6" welded wire mesh or two inch thick asphaltic concrete on a four inch (4") thick bituminous asphaltic base or three inch (3") thick asphaltic concrete on a six-inch (6") thick aggregate base, all of which shall conform to the material and workmanship requirements specified in the Codified Ordinances and O.D.O.T. Spec. 204, 404, 451, 301 and 304.
(Ord. 73-2016. Passed 8-23-16.)
L. Driveway width for a detached or one car attached garage shall be a minimum of ten (10) feet wide and the apron width at the curb shall be a minimum of six (6) feet wider than the driveway width at the sidewalk. Driveways for two (2) car attached garages shall be a minimum of sixteen (16) feet/maximum of twenty-four (24) feet wide up to the sidewalk and the apron width at the curb shall be a minimum of six (6) feet wider than the width of the access drive.
(Ord. 44-2023. Passed 4-25-23.)
M. Where front yard setback requirements are one hundred feet (100') or more, minimum driveway width shall be 10' and the driveway material shall be crushed aggregate to a minimum compacted thickness of six inches (6"). (O.D.O.T. Spec. 304.) However, the first forty-five feet (45') of driveway and apron measured from the street shall be paved with a four and one half inch (4 1/2") minimum of concrete and 6 x 6" welded wire mesh or three inch (3") thick asphaltic concrete on a four inch (4") thick bituminous asphaltic base or a two inch thick asphaltic concrete on a six inch (6") thick aggregate base. (O.D.O.T. Spec. 204, 301, 304, 451, and 404).
N. Where a driveway apron crosses a roadway drainage ditch, the minimum pipe size shall be twelve inches (12") and shall extend a minimum of 5' on both sides of the driveway. The City Engineer shall approve the pipe size based on ditch drainage flows which may require a larger size pipe. At the time of any excavation for foundations or footers, a temporary construction drive shall be installed. The temporary construction drive shall meet the recommended standards of the Ohio's Rainwater and Land Development Manual and be maintained with an aggregate surface. The curb shall be cut prior to construction of the building.
O. The minimum driveway grade shall be four-tenths percent (0.4%) and the maximum driveway grade shall be ten percent (10%).
P. All roof drainage shall be collected by downspouts and directed into the storm sewer drainage system; or, if a public storm sewer is not available, piped to a natural drainage system or roadway ditch in a manner approved by the Building Commissioner or City Engineer.
1. Installation of rain barrels. Rain barrels may be installed on a residential property subject to obtaining a permit and showing compliance with the following:
a. One or more downspouts may be diverted into an approved rain barrel or other structural container, provided it is equipped with an overflow preventer which directs overflow back into a public storm sewer system where available or to an approved rain garden. Where a public storm sewer is not available, rain barrels may be installed and the overflow discharged in a manner approved by the Building Commisssioner or City Engineer.
b. Rain barrels shall only be located in a "rear yard" or "side yard" as defined in the Twinsburg Zoning and Development Regulations.
c. Individual rain barrels shall not have a capacity to store more than 60 gallons in volume.
d. Rain barrels shall be covered at all times and shall incorporate a drainage system that directs any overflow into the public sewer system, or if a public sewer system is absent, away from the building's foundation in a manner so as not to create a nuisance to adajcent property owners.
e. Rain barrels shall be colored or painted in a color compatible with its associated structure and/or surroundings.
2. Rain gardens. Rain gardens may be installed on a residential property subject to obtaining a permit and showing compliance with the following:
a. Rain gardens shall be subject to review and approval of the Building Commissioner.
b. Rain gardens shall be constructed in accordance with guidelines contained in the latest edition of "Rain Garden Manual for Homeowners".
Q. All construction in designated flood plain areas shall be in accordance with the requirements of the National Flood Insurance Program.
R. Prior to the issuance of an occupancy permit, iron lot pins shall be installed on all lot corners by the builder as shown on the building site plan and verified by the Building Comissioner and/or City Engineer.
S. The site plan shall indicate all existing curbs, walks, water service connector boxes, waterline valve hydrants, and manholes located in the street right of way adjacent to the lot. All such appurtenances shall be protected by the builder during construction, and any damage shall be repaired by the builder and where repaired, such existing appurtenances reset by the builder to proper grade prior to the issuance of an occupancy permit.
T. All street trees shall be shown on the plat with spacing as required by the Subdivision Regulations. Street trees shall be planted prior to the issuance of an occupancy permit or the required fee deposited with the City. Responsibility for planting these trees shall not be passed on to the home owners.
(Ord. 73-2016. Passed 8-23-16.)