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HomeMy Public PortalAbout040_010_07-2015 Sec 3-080(C) - redlined - off street parking requirements 02.16.15 EMH • (C) Control of access to structures Staff shall issue a permit for driveways,including those which encroach into the city right of way, for the control of access to structures used for residential purposes including,.but not limited,to single family,duplex,triplex,two family,multifamily,townhomes, apartments,time shares,and condominiums whether owner occupied or held for rental under the following circumstances: (1)materials approved as set forth below are to be used and, (2)to the extent there are no contrary safety-related requirements and all other ordinances are complied with including,but not limited to,the 65%greenspace requirement,regardless of width at the junction of the right of way and the property which the driveway is intended to serve. .In order to promote the safety of motorists and pedestrians,the following regulations shall apply to all newly constructed driveways: (1) A driveway opening which connects a lot with a public street shall not be greater than 25 feet in width at the property line.Driveways that serve duplex lots shall not have a width greater than 15 feet per unit measured at the property line. This section is not intended to prevent the installation of flared driveway ends. These flared ends,when constructed in accordance with adopted standards and specifications, shall not count towards the width of the driveway. (2) There shall be no more than two driveway openings on any lot of any width. The total of the widths at the property line of two driveway openings shall not be greater than 25 feet. No driveway opening shall be constructed within 25 feet of an intersection,measuring from the nearest improved portion of the right-of-way.However,in any instance where there is not adequate space available and other access is not feasible,staff may permit a reduction in the distance to an intersection from a driveway in order to permit safe access to the property provided the speed limit on abutting or adjacent roads is 30 miles per hour or less. (4) No curb on any city street or right-of-way shall be cut or otherwise altered without prior written approval of the designated city official. (5) For water quality purposes,all newly constructed driveways and replacements of more than 50 percent of existing driveways serving residential uses shall be constructed of materials designed to allow retention of the first one inch of stormwater.A new driveway includes the initial placement of any material on bare soil. Such new driveways and replacements of more than 50 percent of an existing driveway are subject to permitting and inspection(s).A permit and inspection(s)are also required for repair of less than 50 percent of an improved driveway. The retention requirement is based on a 24-hour,25-year Tybee III SCS storm.A permit is required for installation of a new or replacement driveway.An inspection is required of each layer prior to the next layer being installed. The permit applicant shall be responsible for all engineering fees incurred by the city for review of materials,even when a material is not approved.Acceptable materials include: a. Stone must be either AASHTO#57,#67,#78,or#89 open graded with no fines,or pea gravel with no fines,or a combination of two or more. Graded aggregate base(also known as "crusher run"or"crush and run")is not allowed. b. Standard brick pavers are four-inch by eight-inch with minimum five-sixty-fourths-inch average continuous joints/borders with eight one-eighth-inch wide spacers per paver filled with masonry sand. See item(c)for base and header requirements. If larger bricks are used,thereby creating less linear joint and surface area joint,calculations by a state licensed design professional must be reviewed and approved by the city. See engineering fee information in subsection(1). I. Permeable interlocking concrete pavers(PICP)are solid structural units installed with openings as described in the coastal stormwater supplement(CSS)through which stormwater runoff can rapidly pass into the underlying reservoir of a four-inch minimum depth open-graded stone,no fines. Openings may be filled only with pea gravel or larger stone,or with masonry sand.A concrete header curb or paver/concrete block ribbon with a maximum width of eight inches must be installed around the perimeter of the pavers.Building foundations and garage floors may serve as a portion of the perimeter. The edge of a paved road may not serve as a perimeter.Flush headers and ribbons are included in the driveway measurements. To not be included in the driveway measurements a header or ribbon must be installed lower than the driveway pavers,covered with adequate top soil,and seeded or sodded to facilitate vegetation. d. Ribbon driveway designs are normally constructed of concrete but other materials may be considered.The ribbons are to be a maximum of 18 inches wide with a one to two percent cross slope to route runoff to adjacent pervious areas rather than down the strips to the street. The area between the strips may be either grass or stone as described in subsection(a). The area between the drive strips is to be flush or one-eighth-inch below the driving strip to encourage the percolation of stormwater runoff between the driving strips. e. Concrete grid pavers(CGP)are precast concrete units that allow rainfall and stormwater runoff to pass through large openings that are filled with pea gravel,sand or topsoil and turf.A concrete header curb or brick/concrete block ribbon with a maximum width of 12 inches(flush or one-eighth-inch higher than the contained permeable pavement)must be installed around the perimeter of the permeable pavement. Building foundations and garage floors may serve as a portion of the perimeter. The edge of a paved road may not serve as a perimeter. Header and ribbons are included in the driveway measurements. To not be included in the driveway measurements a header or ribbon must be installed lower than the driveway pavers,covered with adequate top soil, and seeded or sodded to facilitate vegetation. f. Plastic grid pavers(PGP)consist of flexible,interlocking plastic units that allow rainfall and stormwater runoff to pass through large openings that are filled with gravel, sand or topsoil and turf.A header curb is required and is included in the driveway measurement. g. Pervious concrete(also known as porous concrete)is similar to conventional concrete in structure and form,but consists of a special open-graded surface course,typically four to eight inches thick,that is bound together with Portland cement. h. Porous asphalt is similar to pervious concrete, and consists of a special open-graded surface course bound together by asphalt cement. For all other proposed materials, calculations are required from a state licensed design professional demonstrating compliance with the retention requirement of this section.