The following information, if applicable, must be included in
an application:
5.3.1 A table of development data showing, if applicable:
2. Total area of delineated wetland resource areas;
4. Length of street and area in street right-of-way;
5. Area of common open space, outdoor amenity space, and outdoor gathering
space;
6. Area and percentage of site coverage of buildings;
7. Proposed and allowed gross floor area and net floor area of all buildings
and dwelling units;
8. Calculation for inclusionary dwelling units pursuant to § 135-6.9
or 135-6.12;
9. The number dwelling units, or their equivalent; and
10. The number of off-street parking spaces and loading bays.
11. Checklist of SITES performance standards.
5.3.2 Stormwater Management. A drainage analysis, prepared by a civil engineer,
showing:
[Amended 9-27-2023]
1. For projects disturbing more than 10,000 square feet of land area, a stormwater management plan as defined in §
181-75 that includes:
b. Drawings and specifications.
c. Erosion, sedimentation, and pollution prevention plan.
d. Operation and maintenance plan (O&M Plan).
2. For projects disturbing less than 10,000 square feet of land area, an erosion and sediment control plan as defined in §
181-75C.
5.3.3 Soil Surveys, Test Pits, and Test Borings. Soil surveys, test pits,
and test borings, prepared by a civil engineer, to decide the suitability
of the soil for the proposed streets, drainage and utilities, to be
taken at 100-foot intervals at the proposed station points as described
in the street layout and profile per § 176-5.2.5 or at such
other points as the Town Engineer may request.
5.3.4 Traffic Study. A traffic study and a proposal for mitigating measures
to improve capacity or for trip reduction programs, if required by
the Zoning Bylaw. The traffic study must include:
1. Data collection. Data shall not be collected earlier than 12 months
before the submission of a traffic study. Data shall include:
a. Automatic traffic recorder (ATR) counts(s) with full vehicle classification
(i.e., trucks, buses, motorcycles, etc.) for a minimum forty-eight-hour
weekday period. Location(s) must receive prior approval of the Planning
Director. Full fifteen-minute segment data shall be submitted electronically
to the Board.
b. Pedestrian and bicycle counts taken at ATR locations as required
by the Planning Director.
c. Intersection turning movement counts (TMC) and queues of the morning
and evening peak periods at the intersections likely to be affected
by the proposed development, including vehicle classification; pedestrian
and bicycle movement counts, whether on the roadway or sidewalk. In
special circumstances where the peak traffic impacts are likely to
occur at times other than the usual morning and evening peak periods,
the additional counts for those peak periods are required.
d. ATR and TMC counts may not be taken during weeks with public or major
religious holidays, nor school breaks. Counts are not valid in inclement
weather. If counts are not taken during the months of April, May,
September or October then the Board may require additional counts.
e. Traffic crashes, summarized from the Massachusetts Highway Department
records for the previous three-year period, including crash type,
injury, the involvement of pedestrians and/or bicycles, surface conditions,
and weather.
2. Analysis.
a. An estimate of trip generation for the proposed development showing
the projected inbound and outbound vehicular trips for the morning
and evening peak periods and a typical twenty-four-hour period. Where
there is existing development of the same type of use on the site,
actual counts of trip generation must be submitted.
b. Trip generation rates must be based on the most recent edition of
the Trip Generation Manual prepared by the Institute of Transportation
Engineers that is on file in Lexington Town Engineer's office, and,
if applicable, data about similar developments in Massachusetts; or
data from professional planning or transportation publications, provided
that the methodology and relevance of the data is documented.
c. The morning and evening peak period is usually the two hours between
7:00 a.m. and 9:00 a.m. and between 4:00 p.m. and 6:00 p.m. respectively.
The morning and evening peak hour is that consecutive sixty-minute
segment in the peak period in which the highest traffic count occurs
as determined by traffic counts of the peak period divided into fifteen-minute
segments. For uses that have an exceptional hourly, daily or seasonal
peak period, additional analysis must be conducted for that extraordinary
peak period.
d. An estimate of the directional distribution of new trips by approach
streets and an explanation of the basis of that estimate. Where there
is existing development of the same type of use on the site, actual
counts of trip directional distribution must be submitted.
e. An assignment of the new trips to be generated by the proposed development
to the segments of the Town street network, including state highways,
which are likely to be affected by the proposed development.
f. An inventory of roadway characteristics of the principal approach
streets adjacent to the development site and of the streets in the
intersections at which turning movement counts are taken showing the
width of the right-of-way and of the traveled way, traffic control
devices, obstructions to adequate sight distance, the location of
driveways or access drives within 500 feet of the entrance to the
site for uses that are substantial trip generators, and the presence
or absence of sidewalks and their condition, and the manner in which
bicycles are accommodated.
3. Mitigation.
a. In the case of a development in an abutting community, which will
have a traffic impact on a street or intersection in Lexington, which
is likely to be affected by the proposed development for which the
traffic study is being prepared, the traffic impact of the development
in the abutting community must be included in the traffic study, provided
that:
i. The development has been approved by official action of that abutting
community but has not opened for use before the date that the traffic
counts required by this section were taken; and
ii. Data on the traffic impact of that development, comparable to that
required by this section, is available.
b. Analysis of the effect on the capacity of those intersections in
the Lexington street system likely to be affected by the development
during both daily peak periods showing:
i. Existing traffic at these intersections;
ii. Additional traffic generated by the development without consideration
of any mitigating measures or trip reduction programs;
iii.
The additional traffic generated by the development inclusive
of mitigating measures or trip reduction programs;
iv. Future traffic from other developments previously approved by the
Town of Lexington for which a traffic study was required, or by an
abutting community, which has not yet been opened for use before the
date that the traffic counts required by this section were taken.
c. Where mitigating measures or trip reduction programs are proposed,
they must be proposed by the applicant and accompany the traffic study
at the time of filing of the application. Where the proposed mitigating
measure is the construction of a traffic engineering improvement,
evidence, such as letters of support, or commitment, or approval,
or the award of a contract, may be submitted to show that construction
of the traffic improvement is likely to occur.
d. An estimate of the time and amount of peak accumulation of off-street
parking. The counts referred to above must have been taken in the
12 months before the filing of the application. Upon request, the
traffic engineer must furnish an explanation of the methodology of
the traffic study and additional data, as needed.
In addition, to the plans, studies, analyses, and tests, the
various types of applications cited in these Regulations require or
permit that the following documents and exhibits be submitted, if
applicable:
5.4.1 Deed or Easement: drafts of any deed, easement, or restriction offered
to the Town.
5.4.2 Site Development Conditions: proposed conditions limiting the use
of parts of the site, maintaining or enhancing existing natural features,
making site improvements or landscaping, or accepting or assigning
responsibility for maintenance.
5.4.3 Building Design: proposed conditions, which may include a visual
representation, such as sketches or photographs, limiting the size,
scale, type, style, siting and exterior appearance of buildings.
5.4.4 Off-Site Traffic Improvements: proposals for mitigating measures
or the design or construction of off-site improvements (or financial
contributions thereto) to deal with the traffic impacts of the proposed
development, including any trip reduction commitments.
5.4.5 Off-Site Town Facilities and Services: proposals for mitigating measures
or the design or construction of off-site improvements (or financial
contributions thereto) to deal with the impacts, except traffic impacts,
of the proposed development on Town facilities or services.
5.4.6 Use of Buildings: proposed special conditions limiting the types
of establishments that may use buildings or land and their hours of
operation.
5.4.7 Housing: proposed special conditions limiting the type, size, or
location of dwelling units, or the income range of occupants, or dealing
with the level of, or term of continued, affordability of dwelling
units.
5.4.8 Historic or Architectural Preservation: proposed special conditions
dealing with the maintenance or restoration of buildings or places
of historic or architectural significance.
5.4.9 Other Material: any other material necessary for the Board to make
the findings required by § 135-9.4.2.