(A) Road plan and profile map. A one-inch to 40-foot horizontal scale road plan, with the corresponding stationed segment of centerline profile, at a vertical scale of one inch to four feet will be submitted. Such plans shall be prepared by a professional engineer licensed to practice in the state whose seal, name and registration number should clearly be placed thereon.
(1) The horizontal scale plan shall have:
(a) Fifty-foot stationing;
(b) Curve information (PT, PC, PI);
(c) All drainage structures utilizing a sequenced numbering system consistent with all submitted designs (inverts in, inverts out, top of frame elevations);
(d) Pipes – slope, size and type;
(e) Utilities; placement (electric, telephone, cable television, water and sewer), where applicable;
(f) Specific soil erosion control measures;
(g) Sidewalk placement;
(h) Accurate existing (not to be represented by less than two-foot intervals) and a proposed finished grading plan;
(i) Monumentation;
(j) All proposed driveway returns and aprons; and
(k) Location of road test pits every 150 feet.
(2) The vertical profile shall have:
(a) All vertical curve information (Pvt, Pvc, Pvi, high points and low points);
(b) Drainage structures in profile; and
(c) Accurate existing and proposed centerline grades and existing grade at edge of pavement both right and left sides.
(3) Drainage report. In the construction and layout of new streets in a subdivision, adequate provisions shall be made for the disposal of surface and stormwater.
(4) The report will include:
(a) Rational method or TR-55 of analysis for areas under 200 acres or TR-20 for areas over 200 acres;
(b) Total drainage area delineated on the USGS or equivalent mapping;
(c) Two maps depicting the entire drainage area that will attribute specific areas of concentration to the appropriate drainage structure; and
(d) A gutter flow analysis (storm sewer design analysis) shall be submitted on state standard forms or equivalent
(B) Erosion and sedimentation control plan.
(1) A Soil Erosion and Sedimentation Control Plan shall contain proper provisions to adequately control accelerated erosion and sediment and reduce the danger from stormwater runoff on the proposed site based on the best available technology. Such principles, methods and practices necessary for certification are found in the Connecticut Guidelines for Soil Erosion and Sediment Control (1985), as amended. Alternative principles, methods and practices may be used with prior approval of the Planning and Zoning Commission or the Board of Selectmen.
(2) Said plan shall contain, but not be limited to:
(a) A narrative describing:
1. The development, as defined in these regulations;
2. The schedule for grading and construction activities:
a. Sequence of grading and construction activities;
b. Sequence for installation and/or application of soil erosion and sedimentation control measures, including temporary stabilization;
c. Sequence and specifications for final stabilization of the project site, including all final landscaping; and
d. Contingency or emergency plans in case of failed erosion and sedimentation control systems and installations.
3. The design criteria for proposed soil erosion and sedimentation control measures and stormwater management facilities;
4. The construction details for proposed soil erosion and sedimentation control measures and stormwater management facilities;
5. The installation and/or application procedures for proposed soil and sedimentation control measures and stormwater management facilities;
6. The operations and maintenance program for proposed soil erosion and sedimentation control measures and stormwater management facilities;
7. Identification of a designated site individual responsible for installation, monitoring and correction of sedimentation control plan requirements, and authorised to take corrective actions as required to ensure compliance with certified plans; and
8. The character of existing vegetation and the effect the development will have on the natural vegetation.
(b) A site plan map at a sufficient scale to show:
1. The location of the proposed development and adjacent properties;
2. The existing and proposed topography, including soil types, wetlands, watercourses and water bodies;
3. The existing structures on the project site, if any;
4. The proposed area alterations, including cleared, excavated, filled or graded areas and proposed structures, utilities, roads and existing, new or altered property lines;
5. The location of and design details for all proposed soil erosion and sedimentation;
6. Control measures and stormwater management facilities;
7. The sequence of grading and construction activities;
8. The sequence for installation and/or application of soil erosion and sedimentation control measures;
9. The sequence for final stabilization of the development site;
10. Existing vegetation patterns and limits and extent of vegetation clearing beyond grading limits; and
11. A certification block entitled “Erosion and Sedimentation Control Plan certified by vote of the Town Planning and Zoning Commission.”
(c) Any other information deemed necessary and appropriate by the applicant or requested by the Planning and Zoning Commission or its designated agent.
(3) Minimum acceptable standards:
(a) Plans for soil erosion and sedimentation control shall be developed in accordance with these Regulations using the principles as outlined in Chapter 3 and Chapter 4 of the Connecticut Guidelines for Soil Erosion and Sediment Control (1985), as amended.
(b) The minimum standards for individual measures are those in the Connecticut Guidelines for Soil Erosion and Sediment Control (1985), as amended. The Planning and Zoning Commission may grant exceptions, when requested by the applicant, if technically sound reasons are presented in writing.
(c) The appropriate method from Chapter 9 of the Connecticut Guidelines for Soil Erosion and Sediment Control (1985), as amended, shall be used in determining peak flow rates and volumes of runoff, unless an alternative method is approved by the Planning and Zoning Commission.
(Ord. passed 1-11-1984)