A.
Purposes. The purposes of open space-residential design (OSRD) are to protect open space, agricultural and forestry land, viewsheds, wildlife habitat and corridors, wetlands and water resources, and historical and archeological resources; to protect the value of real property; to encourage creative, environmentally sensitive design as the preferred form of residential development; and to encourage more efficient development that consumes less open land and respects existing topography and natural features better than a conventional or grid subdivision.
B.
Applicability. In the Residence A or Residence B District, the Planning Board may grant a special permit for an OSRD that includes two or more detached single-family dwelling units.
C.
Reserved.
D.
Permitted uses. An OSRD may include the following uses:
(1)
Detached single-family dwelling.
(2)
Open space, conservation or recreation areas, including trails for walking, hiking, cross country skiing, horseback riding, picnicking and wildlife observation.
(3)
Agricultural, equestrian and horticultural uses.
(4)
Accessory recreational amenities for residents of the OSRD, such as a tennis court or playground.
E.
Dimensional regulations.
(1)
The maximum number of dwelling units in an OSRD shall be determined in accordance with subsection (F) of this section.
(2)
The Planning Board may waive the minimum lot dimensional requirements that normally apply to lots in the Residence A or Residence B District in order to maximize the open space area or facilitate a desired arrangement of buildings and other amenities, and may permit more than one dwelling on a lot in an OSRD, except as follows:
(a)
Lots having reduced area or frontage shall not have frontage on a street other than a street within the OSRD unless the Planning Board makes a written determination that such reduced lot(s) or frontage on other streets will further the goals of this section.
(b)
Dwelling units in an OSRD shall be separated from abutting residential lots by an open space buffer of at least 50 feet.
(c)
Unless waived by the Planning Board, all other dimensional requirements of the applicable zoning district shall apply.
F.
Base maximum number of dwelling units. The base maximum number of dwelling units allowed in an OSRD shall be determined in accordance with the following formula:
Total Number Dwelling Units = 1.50 × | Total Site Area (in square feet) minus | (.5 × Wetlands) minus | (.1 × Total Site Area) |
Zoning District Minimum Lot Area (square feet); See Chapter 7-06 | |||
The proponent shall have the burden of proof with respect to the calculation of wetlands on the site.
G.
Common open space requirement. The OSRD must provide at least 35% of the total area of the site as common open space to be protected in perpetuity. The common open space shall have no structures, parking, private yards, patios, sanitary waste disposal facilities or gardens restricted for the exclusive or principal use by the occupants of individual dwelling units. The common open space shall not be further subdivided, and a notation to this effect shall be placed on the plan of record, which shall be recorded at the Registry of Deeds. The following standards apply to the common open space in an OSRD:
(1)
Use, shape and location.
(a)
Common open space shall be functional for wildlife habitat, passive recreation, resource preservation, agriculture or equestrian uses.
(b)
To the maximum extent feasible, the open space shall be undisturbed, unaltered and left in its natural or existing condition. It shall be appropriate in size, shape, dimension, location, and character to assure its use as a conservation area, or where appropriate, a recreational area. Not more than 10% of the open space may be covered by gravel roadways, pavement or structures accessory to the dedicated use or uses of the open space. However, principal or accessory structures and access roads essential to an agricultural use are exempt from this limitation.
(c)
The percentage of open space that includes wetlands normally shall not exceed the percentage of the site that includes wetlands. However, the common open space may include a larger percentage of wetlands if the Planning Board determines that such inclusion promotes the purposes of this section.
(d)
Wherever feasible, the common open space shall be contiguous and linked as a unit, and linked to other existing open space.
(e)
Underground utilities providing shared or common benefits to residents of the OSRD site may be located within the common open space.
(f)
Existing or proposed utility easements shall not be counted as common open space unless approved by the Planning Board.
(2)
Ownership. Any proposed common open space within an OSRD shall be conveyed in accordance with the provisions of MGL C. 40A, § 9. In any case where the common open space is not conveyed to the Town, a restriction enforceable by the Town by its Conservation Commission or other board under MGL C. 184, §§ 31 through 32 shall be recorded providing that such land shall be kept in perpetuity in an open or natural state, and the Board of Selectmen is hereby authorized to accept such restrictions if the Conservation Commission declines to do so in any instance. Wherever possible, existing trails shall be kept open for limited recreational use.
H.
Pre-submission meeting. Proponents are encouraged to meet with the Planning Board prior to applying for a special permit. The purposes of a pre-application review are to minimize the proponent’s costs for engineering and other technical experts and to solicit guidance from the Planning Board at the earliest possible stage in the planning and permitting process. At the request and expense of the proponent, the Planning Board may engage technical experts to review the informal plans of the proponent and to facilitate submittal of a formal application for an OSRD special permit.
I.
Design process. At the time of the application for a special permit under subsection (J) of this section, the proponent shall demonstrate to the Planning Board that the following design process was carried out by a registered landscape architect and considered by the proponent in determining the layout of proposed streets, house lots, and open space.
(1)
Site analysis. The first step in the design process is to identify the natural, scenic and cultural features on the site and surrounding it, to analyze the design implications of these features, and to evaluate the site in its larger context by identifying physical, cultural and transportation connections to surrounding land uses and activities. Wherever possible, site and context features shall include areas identified by the Planning Board during the pre-submission meeting.
(2)
Open space. The second step in the design process is to identify the open space to be preserved on the site. The open space should include the most sensitive and noteworthy resources of the site, be contiguous, and where appropriate, serve to extend neighborhood open space networks.
(3)
Development envelope. The third step is to locate building sites, streets, parking areas, paths and other built features of the development. The design should include a delineation of private yards, public and private streets and other areas, and shared amenities, so as to reflect an integrated community, with emphasis on consistency with the town’s historical development patterns. To the maximum extent feasible, the proposed area of disturbance shall consist of land outside the areas identified under subsection (I)(1) of this section. The location of dwelling units should account for proximity to common open space and other amenities, including community buildings for use by residents of the development. Toward this end, the number of dwelling units with direct access to the amenities of the development should be maximized.
(4)
Lot and easement lines. The fourth step is to identify the approximate location of lot and easement lines, where applicable.
J.
Special permit procedures.
(1)
General. The special permit application, review and decision procedures shall be in accordance with this Section and Section 7-03-040, and MGL C. 40A, § 9. Where a development requires a special permit under this section and any other section of this bylaw, the special permit applications may be combined into a single submission and the Planning Board may grant a single special permit that addresses all applicable requirements.
(2)
Application requirements. The special permit application shall include an OSRD concept plan and a yield analysis in accordance with the requirements herein. The size, form, number and contents of the required plans and any supplemental information shall be in accordance with Planning Board regulations.
(3)
Sources of data. The concept plan and yield analysis may be prepared from existing data such as deed information, USGS topographical maps, FEMA floodplain maps, assessor’s maps, orthophotos, soil maps or soil conservation survey, Department of Environmental Protection (DEP) Wetlands Conservancy Program maps or other wetland maps as may be on file with the Northborough Conservation Commission, or federal, state or local maps of wildlife habitat and supporting landscapes. While it is not necessary to verify all site constraints prior to preparing a concept plan, they should be represented as accurately as possible in order to avoid significant changes to the concept plan in subsequent applications for approval of a site plan or a subdivision plan. The proponent shall bear the risk of any such changes.
(4)
Required information for OSRD concept plan. The concept plan shall be a schematic representation of the proposed OSRD, with sufficient detail about existing and proposed conditions to enable the Planning Board to understand the nature, scope and impacts of the project being proposed and to be able to respond to the proponent’s proposals in an informed manner. The concept plan shall include scaled drawings prepared by a registered landscape architect. The concept plan shall incorporate the OSRD design process outlined in subsection (I) of this section and account for the minimum design standards of subsection (L) of this section. At minimum, the concept plan shall provide the following information:
(a)
The location of the proposed development;
(b)
The size of the proposed site in acres;
(c)
An existing conditions inventory and an analysis of site and context features identified during the OSRD design process;
(d)
The total number and approximate locations of the proposed buildings, dwelling units and/or lots, and the approximate size of each in square feet;
(e)
The acreage and proposed use(s) of permanent open space;
(f)
A statement on the disposition or manner of ownership of the proposed open space;
(g)
The areas or approximate delineation of lots that will be used as building areas, and the areas or approximate delineation of lots that are to remain as permanent open space;
(h)
The approximate location of proposed roadways;
(i)
A general description of how drainage and wastewater will be handled, including a soils statement and the general area of the site to be used for stormwater management facilities;
(j)
A general description of the proponent’s plans for site improvements, including mitigation of noise, odor or visual impacts arising from the operation of a package treatment plant, where applicable; and
(5)
Yield analysis. The proponent shall submit a yield analysis based on the formula for base maximum number of units in subsection (F) of this section. The purpose of the yield analysis is to demonstrate the maximum number of lots that could be developed on the site under a conventional plan and the maximum number of units that may be permitted in an OSRD. The total number of lots in the OSRD shall be determined by the Planning Board, based upon its review and determination of the proponent’s yield analysis.
(6)
Site alterations. After an OSRD special permit application has been submitted, no tree removal, no utility installation, no ditching, grading or construction of roads, no grading of land or lots, no excavation, except for purposes of soil testing, no dredging or filling and no construction of buildings or structures shall be done on any part of the tract of land proposed for an OSRD until the application has been reviewed and approved or denied as provided by these regulations.
(7)
Decision.
(a)
The Planning Board may grant a special permit for an OSRD with any conditions, safeguards, and limitations necessary to ensure compliance with this section, only upon finding that:
[1]
The conceptual design and layout of the proposed OSRD is superior to a conventional development in preserving open space for conservation and recreation, preserving natural features of the land, achieving more efficient provision of streets, utilities and other public services, and providing a high degree of design quality;
[2]
The OSRD provides for a more efficient form of development that consumes less open land and conforms to existing topography and natural features better than a conventional subdivision;
[3]
The OSRD furthers the purposes of this section.
(b)
The Planning Board may deny a special permit upon finding that the application does not provide sufficient information or does not comply with the provisions of this bylaw; or that the site is not suitable for an OSRD and would be more appropriate for a conventional subdivision plan, which finding shall be set forth in detail in a written decision.
(c)
Effect of special permit approval. Approval of a special permit under this section shall not be considered approval for any construction. The special permit is a preliminary approval, intended to give guidance to the proponent for the development of an OSRD definitive plan, and to determine whether the proponent’s submittal meets the objectives of this section. Any subsequent application for an OSRD definitive plan shall comply with all material aspects and conditions of the special permit granted hereunder.
K.
Definitive plan procedures. Following issuance of a special permit for an OSRD, the proponent is eligible to submit an OSRD definitive plan to the Planning Board. The definitive plan shall be a site plan submitted to the Planning Board in accordance with Section 7-03-050. An OSRD that involves a subdivision of land must be submitted to the Planning Board for approval under the Planning Board’s subdivision rules and regulations.
(1)
The Planning Board may approve a definitive plan that substantially complies with the special permit granted under subsection (J) of this section and meets all of the following additional requirements for common facilities, operations and maintenance:
(a)
Each unit and the OSRD as a whole shall be served by a privately owned and maintained on-site sewage disposal or treatment system. An approved on-site sewage disposal or treatment system serving more than one dwelling unit may be located on land owned in common by the owners of the residential units in the OSRD, subject to requirements of the Northborough Board of Health and Title 5 of the Massachusetts Environmental Code or approved in accordance with the requirements of the Department of Environmental Protection Groundwater Discharge Permit Program.
(b)
To ensure that common open space and common facilities will be maintained properly, each OSRD shall have a residents association in the form of a corporation, nonprofit organization, or trust, established in accordance with appropriate state law by a suitable legal instrument or instruments properly recorded at the registry of deeds or registry district of the Land Court. As part of the definitive plan submission, the proponent shall supply copies of such proposed instruments to the Planning Board.
(2)
The Planning Board may conditionally approve an OSRD definitive plan that does not substantially comply with the special permit. A conditional approval shall identify where the plan does not substantially comply with the special permit, identify the changes to the special permit required to bring the plan into compliance with the special permit, and require the special permit to be amended within a specified time. The public hearing on the application to amend the special permit shall be limited to the significant changes identified in the Planning Board’s conditional approval.
(3)
The Planning Board may disapprove a definitive plan for failure to comply with the special permit or for failure to meet the OSRD design standards in subsection (L) of this section. The definitive plan will be considered not to comply with the special permit if the Planning Board determines that any of the following conditions exist:
L.
Minimum design standards. An OSRD definitive plan shall address the following design standards and any supplemental design regulations or guidelines adopted by the Planning Board under subsection (N) of this section.
(1)
Landscape preservation. Insofar as practicable, an OSRD shall preserve the landscape in its natural state by minimizing tree removal and grade changes. Any grade changes shall be in keeping with the general appearance of neighboring developed areas. The location and orientation of individual building sites shall be such as to maintain maximum natural topography and limit the removal of trees with four inches or more of diameter at breast height (dbh). Topography, viewsheds, tree cover, and natural drainage ways shall be treated as fixed determinants of road and lot configuration rather than as elements that can be changed to follow a particular development scheme.
(2)
Roadway design. Streets shall be designed and located in such a manner as to maintain and preserve natural topography, significant landmarks, and trees; to minimize cut and fill; and to preserve and enhance views and vistas on or off the subject parcel.
(3)
Cultural resources. The removal or disruption of historic, traditional or significant uses, structures, or architectural elements shall be minimized.
(4)
Architectural design. In scale, massing, height, exterior materials and roofline articulation, residential buildings in an OSRD shall be compatible with surrounding residential areas.
(5)
Buffer areas. An OSRD that abuts an existing residential use shall provide a buffer area of at least 100 feet to the property line of adjacent homes. Within the buffer area, no vegetation will be disturbed, destroyed or removed, except for normal maintenance of structures and landscapes approved as part of the OSRD, except that roads or driveways necessary for access and egress to and from the site may cross such buffers. The Planning Board may waive buffer requirements when it determines that a smaller buffer will suffice to accomplish the objectives of this section. The Planning Board may also approve the inclusion of buffer area within the area provided as common open space.
(6)
Drainage. The Planning Board shall encourage and may require the use of nonstructural stormwater management techniques, such as swales, and other drainage techniques that reduce impervious surface and enable infiltration where appropriate.
(7)
Common/shared driveways. A common or shared driveway shall serve not more than four single-family dwelling units unless the Planning Board determines that a common driveway serving more than four units will further the purposes of this section.
(8)
Pedestrian circulation. Where appropriate, walkways shall be provided within the OSRD to link residences with parking areas, recreation facilities and open space, and adjacent land uses.
M.
Incentive for additional open space. For each additional 10% of the site (over and above the required 35%) set aside as common open space, the Planning Board may authorize an increase in the number of dwelling units; provided, that the total number of additional units shall not exceed 25% of the base maximum number of dwelling units determined in accordance with subsection (F) of this section.
N.
OSRD regulations and design guidelines. The Planning Board may adopt rules, regulations and guidelines to administer this section, following a public hearing.