A.
Purposes. The purposes of this section are to:
(1)
Protect the health, safety and property of residents of the Town of Northborough by regulating clearing and grading activities associated with land development, preserving existing trees and vegetation, preventing erosion and sedimentation of wetlands, ponds and other water bodies, controlling stormwater runoff, minimizing fragmentation of wildlife habitat and loss of vegetation;
(2)
Limit land clearing and alteration of natural topography prior to development review;
(3)
Protect specimen trees and significant forest communities from damage or removal during site development;
(4)
Protect water quality of adjacent wetlands and surface water bodies;
(5)
Encourage the use of best management practices that prevent and reduce nonpoint sources of pollutants;
(6)
Encourage land development and site planning practices that preserve the town’s scenic features without preventing the reasonable development of land;
(7)
Protect archaeological and/or historic resources.
B.
Applicability.
(1)
Except as provided in Subsection B(2) of this section, this section shall apply to any clearing or grading of more than 20,000 square feet of land, or in increments such that the total land area of abutting property within the control of any person graded in a twelve-month period will exceed 20,000 square feet. No person shall commence any grading or clearing as defined herein without first obtaining site plan approval by the Planning Board or, where applicable, a special permit with site plan approval by the Zoning Board of Appeals or the Planning Board under Section 7-03-050.
(2)
Exemptions. The section shall not apply to the following activities:
(a)
Agricultural uses exempt under MGL C. 40A, § 3;
(b)
Clearing and grading in conjunction with construction of residential buildings or accessory structures if the land area to be cleared or graded is less than 20,000 square feet;
(c)
Removal of hazardous trees, as defined in this bylaw;
(d)
Routine maintenance of vegetation and removal of dead or diseased limbs and/or trees necessary to maintain the health of cultivated plants, to contain noxious weeds and/or vines, or to remedy a potential fire or health hazard or threat to public safety, when carried out by the Town of Northborough or by any agency of the Commonwealth or the federal government;
(e)
Maintenance of public and private streets and utilities within town-approved roadway layouts and recorded easements;
(f)
Construction or installation of public utilities;
(g)
Activities conducted under an earth removal permit issued by the Town of Northborough or an Order of Conditions issued by the Northborough Conservation Commission.
C.
Submission requirements. When a land clearing and grading proposal requires site plan approval under Section 7-03-050(A)(1), the submission requirements shall be in accordance with the rules and regulations of the Planning Board. For land clearing and grading requiring a special permit with site plan approval under Section 7-03-050(A)(2), the submission requirements shall be in accordance with the rules and regulations of the applicable special permit granting authority. Site plan submissions shall include sufficient information for the Planning Board or special permit granting authority to determine that the proposed land clearing and grading complies, or will comply, with the provisions of this section.
D.
Review standards. The proponent shall demonstrate compliance with the following standards in the clearing or grading of the site:
(1)
Minimize site alteration and land clearing. Site and/or building design shall preserve natural topography outside the development footprint to reduce unnecessary land disturbance and to preserve natural drainage channels on the site. Roots shall be cut cleanly rather than pulled or ripped out during utility trenching. Tunneling for utility installation shall be utilized wherever feasible to protect root systems of trees.
(2)
Protect wildlife habitat. Activities covered by this section shall be designed in such a way as to avoid impacts to rare and endangered species and wildlife habitat on a site. This standard shall apply only to a site that the Natural Heritage and Endangered Species Program (NHESP) (a) has determined to include priority habitat, as documented in the Natural Heritage Atlas, or (b) has delineated as significant habitat, prior to the date of submission to the Planning Board.
(3)
Protect understory vegetation. Understory vegetation beneath the drip line of preserved trees shall also be retained in an undisturbed state. During clearing and/or construction activities, all vegetation to be retained shall be surrounded by temporary protective fencing or other measures before any clearing or grading occurs, and maintained until all construction work is completed and the site is cleaned up. Barriers shall be large enough to encompass the essential root zone of all vegetation to be protected. All vegetation within the protective fencing shall be retained in an undisturbed state.
(4)
Employ proper site management techniques during construction.
(a)
BMPs shall be employed to avoid detrimental impacts to existing vegetation, soil compaction, and damage to root systems; and
(b)
The extent of a site exposed at any one time shall be limited through phasing of construction operations. Effective sequencing shall occur within the boundaries of natural drainage areas.
(5)
Protect the site during construction through adequate erosion and sedimentation controls.
(a)
Temporary or permanent diversions, berms, grassed waterways, special culverts, shoulder dikes or such other mechanical measures as are necessary may be required by the Planning Board to intercept and divert surface water runoff. Runoff flow shall not be routed through areas of protected vegetation or revegetated slopes and other areas. Temporary runoff from erosion and sedimentation controls shall be directed to BMPs such as vegetated swales. Retaining walls may be required where side slopes are steeper than a ratio of two to one.
(b)
Erosion and sedimentation controls shall be constructed in accordance with the most current edition of the Department of Environmental Protection’s Erosion and Sediment Control Guidelines for Urban and Suburban Areas.
(c)
Erosion control measures shall include the use of erosion control matting, mulches and/or temporary or permanent cover crops. Mulch areas damaged from heavy rainfalls, severe storms and construction activity shall be repaired immediately.
(d)
Erosion control matting or mulch shall be anchored where plantings are on areas subject to mulch removal by wind or water flows or where side slopes are steeper than two to one or exceed 10 feet in height. During the months of October through March when seeding and sodding may be impractical, anchored mulch may be applied with the approval of the Planning Board or applicable special permit granting authority.
(e)
Runoff from impervious surfaces shall be recharged on the site by stormwater infiltration basins, vegetated swales, constructed wetlands or similar systems covered with natural vegetation. Runoff shall not be discharged directly to rivers, streams, or other surface water bodies. Dry wells shall be used only where other methods are not feasible. All such basins and wells shall be preceded by oil, grease, and sediment traps. The inlets of all catch basins shall be fitted with filter fabric during the entire construction process to minimize siltation or such basins shall be designed as temporary siltation basins with provisions made for final cleaning.
(f)
The proponent shall be required to conduct weekly inspections of all erosion and sedimentation control measures on the site to ensure that they are properly functioning as well as to conduct inspections after severe storm events.
(6)
Revegetate the site immediately after grading.
(a)
Proper revegetation techniques shall be employed using native (noninvasive) plant species, proper seedbed preparation, fertilizer and mulching to protect germinating plants. Revegetation shall occur on cleared sites within seven calendar days of final grading.
(b)
A minimum of four inches of topsoil shall be placed on all disturbed surfaces that are proposed to be planted unless the Town Engineer recommends a different standard in written comments to the Planning Board or applicable special permit granting authority.
(c)
Finished grade shall be no higher than the trunk flare(s) of trees to be retained. If a grade change of six inches or more at the base of the tree is proposed, a retaining wall or tree well may be required.
E.
Monitoring and inspections.
(1)
Prior to commencement of construction, the proponent, land owner, contractor and construction crew, Director of Public Works, Town Engineer, Building Inspector and site engineer shall conduct a meeting to review the proposed construction phasing and number and timing of site inspections.
(2)
Initial site inspection of erosion and sedimentation controls and placement of tree protection measures shall occur after installation of barriers around preserved areas and construction of all structural erosion and sedimentation controls, but before any clearing or grading has begun.
(3)
Routine inspections of preserved areas and erosion and sedimentation controls shall be made at varying intervals depending on the extent of site alteration and frequency and intensity of rainfall.
(4)
Effective stabilization of revegetated areas must be approved by the Town Engineer before erosion and sedimentation controls are removed. The Town Engineer shall complete an inspection prior to removal of temporary erosion and sedimentation controls.
(5)
Upon completion of the work, the applicant shall submit an as-built plan. The as-built plan shall include, at a minimum and as applicable to the project, elevation of all pipe inverts and outlets, pipe sizes, materials, and slopes; all other drainage structures; limits of clearing, grading and fill; all structures, pavement; contours; and all dates of fieldwork. The drainage system shall also be certified by a Professional Engineer stating the drainage system was built substantially in accordance with the design and will perform as designed. Upon approval by the Town Engineer, one mylar and three paper copies of the as-built plan shall be submitted in addition to an electronic copy compatible with the Town’s GIS system. The as-built plan shall be based on the 1988 NGVD vertical datum.