HomeMy WebLinkAbout2026/03/30 - Response to 1st Stormwater Peer Review - - i
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nob *is
March 30, 2026
File No. 101015.00
Town of North Andover- Planning Board
120 Main Street
North Andover MA 01845
(978) 688-9500
Re: Response to Comments
203 Turnpike Street Solar Carport
Tax Map 024.0-0028-0003.B
203 Turnpike Road - North Andover MA
On behalf of AC Development LLC (Owner) Nobis Group (Nobis) is submitting this response to
the Horsley Witten Group peer review comments dated March 25, 2026 for the proposed project
located at 203 Turnpike Street in North Andover MA. Comments are shown below as black
italicized font and responses are shown in "bold blue font".
Stormwater Management Design Peer Review
1. Standard 1:No new stormwater conveyances (e.g., outfalls) may discharge untreated
stormwater directly to or cause erosion in wetlands or waters of the Commonwealth.
a. The Applicant has analyzed the pre- and post-development stormwater runoff to two
points of analysis (POA).
(1) POA-1 is an existing 12-inch drainpipe that outfalls into the wetland resource
area on the west corner of the parcel. Wetland flag series 1 B though 14B.
(2) POA-2 is an existing 12-inch drainpipe that outfalls into the wetland resource
area on the south corner of the parcel. Wetland flag series 1D through 12D.
b. HW recommends that the Applicant confirm that the two outfalls are not currently
causing erosion in wetlands or waters of the Commonwealth.
Response: T ,,,, e .isti� outfalls r �n t currently e ���,.. � ,,,,r s n in the et n s orwaters i n
the elth.. No additional flow is introduced that would impact t the existing
system.
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2. Standard 2: Stormwater management systems shall be designed so that post-development peak
discharge rates do not exceed pre-development peak discharge rates.
a. The Applicant has illustrated that the post-development stormwater runoff will be
identical to the pre-development runoff. The Applicant is not altering the impervious
surface within the parking lot and has not proposed any detention or retention stormwater
practices. No further action is requested.
b. HW recommends that the Applicant clarify which direction the solar panels will pitch. It
appears that the downgradient side of the panels will be on the east side.HW recommends
that for clarity the Applicant include a note on the Site Plan.
c. Per§250-22 B. (5)(b) and§250-23 A. (1) of the North Andover Stormwater Regulations,
Low-Impact development(LID)site planning and design strategies must be implemented
to the maximum extent feasible. HW recommends that the Applicant document any LID
options it considered within the Project Area.
d. In accordance with §250-22 B. (5)(c), HW recommends that the Applicant identify the
watershed basin and the downgradient water body that stormwater from the project site
discharges into.
e. In accordance with§250-23 E. (19), the Applicant must utilize the 24-hour rainfall data
taken from National Oceanic and Atmospheric Administration (NOAA)Atlas 14 for the
rainfall precipitation depths. The Applicant has used the Cornell Extreme Precipitation
Rates Rainfall values, which are similar.
f HW recommends that the Applicant use a grass and woods surface condition of`good"
instead of`fair."HW understands that this suggestion will not have any impact on the
design, as the existing and proposed conditions are identical.
a. Noted
b. 'The site plan has been updated to 1*nd.l*cate the pi'tch of the sloped. roof. 'The
proposed. pl*tched to the south. T a . i ,,,
stormwater r l scharge stormwater sti'ng points
of : si* .
c. In accordance w1ith the Massachusetts Stormwater Checkfist, the followl"ng LID
rtem. 'been. s curbanc to any- recourse areas &
parklMinimizing disturbance to existing trees and shrubs. Given. the site i's a paved
waterng lot WI*th finil'ted. access and nianeuverabidiky, tree 'boxes, grass channels,
and qual would not fib anywhere on s fte and.would ,,,, an overall
burde .
� a ,,, proposed. green project.
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d. 'T ter shed area.d1kcharges to the Shawsheenri'v-er to the west
e. ,,,,
f. The .. . -updated. to Woods Good lenstead of'Woods Fay .
'The stormwater report and peak discharge numbers have alsobeen updated.
3. Standard 3 requires that the annual recharge from post-development shall approximate annual
recharge from pre-development conditions.
a. The Applicant has illustrated that the post-development annual recharge will be identical
to the pre-development recharge. The Applicant is not increasing or decreasing the
impervious surface within the parking lot. No further action is requested.
4. Standard 4 requires that the stormwater system be designed to remove 80%Total Suspended Solids
(TSS) and to treat 1-inch of volume from the impervious area for water quality.
a. The Applicant has proposed to add hooded outlets (Eliminators) to the existing catch
basins to improve the TSS removal obtained.HW recommends that the Applicant confirm
that the existing catch basins have 4-foot-deep sumps.
b. In Section 1 of the Stormwater Operation & Maintenance Plan the Applicant notes that
riprap overflow controls will be placed at the outlets to provide energy dissipation. HW
recommends that the Applicant confirms if any riprap is proposed at the existing outfalls.
c. HW recommends that the Applicant include street sweeping on a routine schedule in
compliance with Volume 2, Chapter 1,page 9 of the MSH.
d. HW recommends that the Applicant address the Phosphorous removal calculations in
accordance with§250-23 C. (1) of the North Andover Stormwater Regulations.
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ex�tsti..n.g ca.-tch.basi.n.su.m.p depth.. "ll.."'Wo (2)catch.basi.n.swere not accessi..ble. One had.
a pa,rked cair aii.bo-ve it aind the second. ttad a. .. silt: saii,clk. `:.7he catch. ba, iir.s can. be
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„� �� � � „�� been. III..pd.ate: r,,,, o e tfie rip rap
o-verflosw cointrols at t1iii.e o-uiiii.tlet. ,..s stated. a n u t .e ijllll tl[e ts are located iiin. t.
.e . .„.. .,. o . , ; 1.s Pr„]P?1 o ed. liiiri t iii. . .e -IaiI�r.d..
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i.11n.A dill .l. lben.efit.
:.. Ph.., h. iruiiII. toa.d. calcuii.Iatloiinri.s ha. e " iii` ]�yinr .a : d. III t,. .1 is t., be noted. 1 a.t. -the
�,yiiir'" -,s ,.,.piro e(-.t fiiii.as r .o i�. .c iiire . iIII..iIII IIIi.iIII....I. e. i.. .s airea an. .th.e BMP(catc.b.b s1.III.. .t tiiiI�..
°III. .:t " : III I. i�. IIr III. .t�lll . d . ro il. III. "W�:� iIII`III.iIlr uu a 'III Ills.t
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exte n.,.s pract.,-.i.cabie per Storingi.� auk ,,,ir :,,,, .n.d.1 lk:. St ..n.,,, 17.. .,,,...I ,. .d.d. t „t . .l.
.,,, M:,, s are n. t...,,,,,° .. ,t and.. u.]Id. provi.de a bu.rd.eri. t u, tt-i.e project.
5. Standard 5 is related to projects with a Land Use of Higher Potential Pollutant Loads(LUHPPL).
a. The Applicant has indicated that the project is considered a L UHPPL, likely because of
the vehicle trips per day. The Applicant has also noted that it is meeting Standard 5 to the
maximum extent practicable by improving the TSS removal.No further action is requested
at this time.
6. Standard 6 is related to projects with stormwater discharging into a critical area, a Zone II, or an
Interim Wellhead Protection Area of a public water supply.
a. The proposed development is not discharging near or into a critical area, Zone II or an
I WPA area. Standard 6 is not applicable.
spon. ,,,,: ."Noted.
7. Standard 7 is related to projects considered Redevelopment. A redevelopment project is required
to meet the following Stormwater Management Standards only to the maximum extent
practicable: Standard 2, Standard 3, and the pretreatment and structural best management
practice requirements of Standards 4, 5, and 6. Existing stormwater discharges shall comply with
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Standard 1 only to the maximum extent practicable. A redevelopment project shall also comply
with all other requirements of the Stormwater Management Standards and improve existing
conditions
a. This project is considered a redevelopment. As listed above, the Applicant is required to
meet the standards to the maximum extent practicable and improve existing conditions.
HW recommends that the Applicant describe how it is improving existing conditions.
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floatiiini.g particles i ch.argi1 . iin t „ t e,we t. ii.i i.d..
8. Standard 8 requires a plan to control construction related impacts including erosion,
sedimentation, or other pollutant sources.
a. The Applicant has provided erosion controls on Sheet C-1 and the associated details on
Sheet C-3. The catch basins will be installed with silt sacks, and an erosion control barrier
will be placed at the edge of the pavement closest to the resource areas. HW notes that the
area of land disturbance is relatively minimal, including 10 columns to hold the canopies,
and the installation of the electrical cables beneath the existing asphalt. No further action
is requested.
b. HW notes that the limit of disturbance will be less than 1 acre therefore a Construction
General Permit (CGP) and a Stormwater Pollution Prevention Plan (SWPPP) is not
required by EPA.
::'..e s gyp„ ii .s : Noted.
9. Standard 9 requires a Long-Term Operation and Maintenance (O &M)Plan to be provided.
a. The Applicant has provided an Operation and Maintenance Plan as Appendix D in the
Stormwater Management Report. The document can easily be removed as a standalone
reference. The plan lists the Landowner and Team Leader. However, there are several
contacts that are noted as TBD and references to the Town of Walpole that should be
corrected. The Planning Board may choose to require receipt of a final signed O&M Plan
prior to land disturbance as a condition of approval.
b. HW recommends that the Applicant include inspection of the outfalls and sweeping of
the parking lot in the O&M Plan.
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c. HW recommends that the Applicant provides a simple sketch that includes the stormwater
practices for the entire parcel, specifically all catch basins and outfalls. HW further
recommends that the sketch includes snow storage locations.
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t:, tl.e proper I I t�1 ��s :;:�l i. i. �l re t �„� .ta t s Ii.a � �e .corrected.
b. IIII. . '' 1111. ..ni,.spe ,....1. have been. a.d. . d. t , hip `,::. .]I rt. Street swt-,:bepi'...n.g Iliii.as been.
orn.1-t-ted. based. on.the above response.
c. A, s l li. b.a.s been. .cl. . :1ed as part. Vim't hi "e s n.s e t N mi._m.e l s.
10. Standard 10 requires an Illicit Discharge Compliance Statement be provided.
a. The Applicant has provided an unsigned Illicit Discharge Compliance statement. The
Planning Board may choose to require receipt of a signed version as a condition of
approval.
Response,: t,,,,
Please contact me if you have any questions or need additional information at 978-703-6024 or
iralphsgnobis-group.com.
Sincerely,
fl,000�110_
Jon Ralphs
Project Manager
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Phosphorus loading Calculations
Existing Conditions Phosphorus Loading
Land Use Phosphorus load
Site Use Acres
(Ib/ac/yr)
Commercial Impervious
1.78 4.31
Commercial Pervious
0.03 1.01
Formula
Existing Phosphorus Load (yr 16) _ (1.78) * (4.31) = 7.67
Existing Phosphorus Load (yr lb) _ (0.03) * (1.01) =0.03
= 7.7 Ibs/yr
Propoosed Conditions Phosphorus Loading
Land Use Phosphorus load
Site Use Acres
(lb/ac/yr)
Commercial Impervious
1.78 4.31
Commercial Pervious
0.03 1.01
Formula
Existing Phosphorus Load (yr 16) _ (1.78) * (4.31) = 7.67
Existing Phosphorus Load (yr 16) _ (0.03) * (1.01) =0.03
= 7.7 Ibs/yr
*Per MA MS4 General Permit,Appendix F Table 7-2—Average Annual District Phosphorus Load (P Load)
export rates for use in estimating phosphorus load reduction credits in the MA MS4 permit. (PLE;
Phosphorus Load Export)
Proposed Conditions Phosphorus Removal
BMPS on site (Catch basins) on the redevelopment project provide no nutrient load reduction
to phosphorus. Since impervious area remained the same, no new phosphorus load has been
introduced as part of the proposed project.The burden would be excessive to meet the 50
Phosphorus loaded requirement and per the Stormwater Handbook Standards,the project
has met the requirements to the maximum extents practicable.
Appendix F Attachment 1
ATTACHMENT 1 TO APPENDIX F
Method to Calculate Baseline Phosphorus Load (Baseline), Phosphorus Reduction
Requirements and Phosphorus load increases due to development WDEVinc1
The methods and annual phosphorus load export rates presented in Attachments 1, 2 and 3 are for
the purpose of measuring load reductions for various stormwater BMPs treating runoff from
different site conditions (i.e. impervious or pervious) and land uses (e.g. commercial, industrial,
residential). The estimates of annual phosphorus load and load reductions due to BMPs are
intended for use by the permittee to measure compliance with its Phosphorus Reduction
Requirement under the permit.
This attachment provides the method to calculate a baseline phosphorus load discharging in
stormwater for the impaired municipalities subject to Lakes and Ponds TMDL. A complete list of
municipalities subject to these TMDLs is presented in Appendix F, Table F-6. This method shall
be used to calculate the following annual phosphorus loads:
1) Baseline Phosphorus Load for Permittees
2) Phosphorus Reduction Requirement
This attachment also provides the method to calculate stormwater phosphorus load increases due
to development for the municipalities subject to the Charles River TMDL requirements and the
Lakes&Ponds TMDL requirements:
3) Phosphorus Load Increases due to Development
The Baseline Phosphorus Load is a measure of the annual phosphorus load discharging in
stormwater from the impervious and pervious areas of the impaired Lake Phosphorus Control
Plan(LPCP)Area.
The Baseline Phosphorus Pounds Reduction referred to as the permittee's Phosphorus
Reduction Requirement represents the required reduction in annual phosphorus load in
stormwater to meet the WLA for the impaired watershed. The percent phosphorus reduction for
each watershed(identified in Appendix F, Table F-6) is applied to the Baseline Phosphorus Load
to calculate the Phosphorus Pounds Reduction.
The Phosphorus load increases due to development(PDEvinc) is the stormwater phosphorus
load increases due to development over the previous reporting period and incurred to date.
Increases in stormwater phosphorus load from development will increase the permittee's baseline
phosphorus load and therefore,the phosphorus reduction requirement.
Examples are provided to illustrate use of the methods. Table 1-1 below provides annual
composite phosphorus load export rates (PLERs)by land use category for the Baseline Load and
Phosphorus Reduction Requirement calculations. The permittee shall select the land use category
that most closely represents the actual use of the watershed. For watersheds with institutional
type uses, such as government properties,hospitals, and schools,the permittee shall use the
commercial land use category for the purpose of calculating phosphorus loads. Table 1-2 provides
annual PLERs by land use category for impervious and pervious areas. The permittee shall select
the land use category that most closely represents the actual use of the watershed. For pervious
areas, if the hydrologic soil group (HSG) is known,use the appropriate value. If the HSG is not
known, assume HSG C conditions for the phosphorus load export rate. For watersheds with
Page 1 of 6
Appendix F Attachment 1
institutional type uses, such as government properties,hospitals, and schools,the permittee shall
use the commercial/industrial land use category for the purpose of calculating phosphorus loads.
Table 1-3 provides a crosswalk table of land use codes between Tables 1-1 and 1-2 and the codes
used by MassGIS.
The composite PLERs in Table 1-1 to be used for calculating Baseline Phosphorus Load are
based on the specified directly connected impervious area(DCIA). If the permittee determines
through mapping and site investigations that the overall DCIA for the collective area for each
land use category is different than the corresponding values in Table 1-1, then the permittee is
encouraged to submit this information in its annual report and request EPA to recalculate the
composite PLERs for the permittees to use in refining the Baseline Phosphorus Load calculation
for the LPCP.
(1)Baseline Phosphorus Load: The permittee shall calculate the Baseline Phosphorus Load by
the following procedure:
1) Determine the total area(acre) associated with the impaired watershed;
2) Sort the total area associated with the watershed into land use categories;
3) Calculate the annual phosphorus load associated with each land use category by
multiplying the total area of land use by the appropriate land use-based composite
phosphorus load export rate provided in Table 1-1; and
4) Determine the Baseline Phosphorus Load by summing the land use loads.
Example 1-1 to determine Baseline Phosphorus Load:
Watershed A is 18.0 acres,with 11.0 acres of industrial area(e.g. access drives,
buildings, and parking lots), 3.0 acres of medium-density residential and 4.0 acres of
unmanaged wooded area.
The Baseline Phosphorus Load= (Baseline P Load IND) + (Baseline P Load MDR)+
(Baseline P Load FOR)
Where:
Baseline P Load IND= (TAIND)x(PLER for industrial use (Table 1-1))
= 11.0 acre x 1.27 lbs/acre/year
= 14.0 lbs P/year
Baseline P Load MDR=(TAMDR)x(PLER for medium density residential(Table 1-1))
= 3.0 acre x 0.49 lbs/acre/year
= 1.5 lbs P/year
Baseline P Load FOR=(TAFOR)x(PLER for forest(Table 1-1))
=4.0 acre x 0.12 lbs/acre/year
= 0.5 lbs P/year
Baseline Phosphorus Load= 14.0 lbs P/year+ 1.5 lbs P/year+ 0.5 lbs P/year
= 16.0 lbs P/year
Page 2 of 6
Appendix F Attachment 1
(2)Baseline Phosphorus Pounds Reduction(Phosphorus Reduction Requirement): The
Baselines Phosphorus Reduction requirement is the amount of reduction in annual phosphorus
load(in pounds)that the permittee is required to achieve in the Watershed. The permittee shall
calculate the Phosphorus Reduction Requirement by multiplying the Baseline Phosphorus
Load by the applicable percent phosphorus reduction for that watershed specified in Table F-6
(Appendix F).
Example 1-2 to determine Watershed Phosphorus Reduction Requirement:
Table F-6 identifies Watershed A's percent phosphorus reduction as 45%; therefore the
Watershed Phosphorus Reduction Requirement is:
Phosphorus Reduction Requirement = (Baseline Phosphorus Load)x(0.45)
= (16.0 lbs P/year)x(0.45)
= 7.2 lbs P/year
(3)Phosphorus load increases due to development(PDEVinc : To estimate the increases in
stormwater phosphorus load due to development in the Watershed(either PCP or LPCP Area),
the permittee will use the following procedure:
1) Determine the total area of development by land use category and calculate the
baseline load from that area using the composite PLERs in Table 1-1;
2) Distribute the total development area into impervious and pervious subareas by land
use category;
3) Calculate the phosphorus load due to development(PDEV) for each land use-based
impervious and pervious subarea by multiplying the subarea by the appropriate
phosphorus load export rate provided in Table 1-2; and
4) Determine the phosphorus load increase (PDEvi,,)by subtracting the baseline
phosphorus load from the increased phosphorus load due to development.
Note: If structural BMPs are installed as part of new development, the PDEVinc will be reduced by
the amount of BMP load treated by that BMP as calculated in Attachment 3.
Example 1-3 to determine Phosphorus Load Increases: For the same 15.11 acre
Watershed A as specified in Example 1-1, a permittee has tracked development in the
LPCP Area in the last year that resulted in 1.5 acres of medium density residential area
and 0.5 acres of forest land being converted to high density residential impervious area as
detailed below. The undeveloped MDR area is pervious area, HSG C soil and the
undeveloped forest area is pervious, HSG B soil.
Land Use Baseline Baseline P export rate Developed P export rate
Category Area area (lbs Area converted (lbs
(acres) (lbs unchanged P/acre/yr)** to HDR IA P/acre/yr)**
P/acre/yr)* (acres) (acres)
Industrial 11.0 1.27 No change -- No change --
MDR 3.0 0.49 1.5 0.21 1.5 2.32
Page 3 of 6
Appendix F Attachment 1
Forest 4.0 0.12 3.5 0.12 0.5 2.32
*From Table 1-1; ** From Table 1-2
The phosphorus load increase is calculated as:
Baseline Load=(Baseline P Load IND) +
(Baseline P Load MDR)+
(Baseline P Load FOR)
= 16.0 lb/year(determined in Example 1-1)
PDEv =(TAM x PLERIND)+(IAHDR x PLERHDR)+(PAMDR x PLERMDR)+(PAFOR x
PLERFor)
= (11.0 acres * 1.27) + (2.0 acres * 2.32) + (1.5 acres * 0.21) + (3.5
0.12)
= 19.0 lbs P/year
PDEvinc =PDEv-Baseline Load
= 19.0- 16.0
=3.0 lbs/year
Table 1-1. Annual composite phosphorus load export rates
Representative Composite PLERs,
Land Cover DCIA, % Composite PLERs,lb/ac/yr
kg/ha/yr
Commercial 57 1.13 1.27
Industrial 67 1.27 1.42
High
Density 36 1.04 1.16
Residential
Medium
Density 16 0.49 0.55
Residential
Low
Density 11 0.30 0.34
Residential
Freeway 44 0.73 0.82
Open Space 8 0.26 0.29
Agriculture 0.4 0.45 0.50
Forest 0.1 0.12 0.13
Page 4 of 6
Appendix F Attachment 1
Table 1-2: Proposed average annual distinct P Load export rates for use in
estimating P Load reduction credits the MA MS4 Permit
Phosphorus Source Land Surface P Load Export p Load Export
Category by Land Use Cover Rate, Rate, kg/ha/yr
lbs/acre/year
Directly connected 1.78 2.0
Commercial (Com)and impervious
Industrial (Ind) pervious See* DevPERV See* DevPERV
Multi-Family(MFR)and Directly connected 2.32 2.6
High-Density Residential impervious
(HDR) Pervious See* DevPERV See* DevPERV
Medium-Density Directly connected 1.96 2.2
Residential(MDR) impervious
Pervious See* DevPERV See* DevPERV
Low Density Residential Directly connected 1.52 1.7
(LDR) - "Rural" impervious
Pervious See* DevPERV See* DevPERV
Directly connected 1.34 1.5
Highway(HWY) impervious
Pervious See* DevPERV See* DevPERV
Directly connected 1.52 1.7
Forest(For) impervious
Pervious 0.13 0.13
Directly connected 1.52 1.7
Open Land(Open) impervious
Pervious See* DevPERV See* DevPERV
Directly connected 1.52 1.7
Agriculture (Ag) impervious
Pervious 0.45 0.5
*Developed Land Pervious
(DevPERV)-Hydrologic Pervious 0.03 0.03
Soil Group A
*Developed Land Pervious
(DevPERV)-Hydrologic Pervious 0.12 0.13
Soil Group B
*Developed Land Pervious
(DevPERV) -Hydrologic Pervious 0.21 0.24
Soil Group C
*Developed Land Pervious
(DevPERV) -Hydrologic Pervious 0.29 0.33
Soil Group GD
*Developed Land Pervious
(DevPERV) -Hydrologic Pervious 0.37 0.41
Soil Group D
Page 5 of 6
Appendix F Attachment 1
Table 1-3: Crosswalk of MassGIS land-use categories to land-use groups for P Load
Calculations
Mass GIS Land Use group for
Land Use Description calculating P Load-
LU_CODE 2013/14 MA MS4
1 Crop Land Agriculture
2 Pasture (active) Agriculture
3 Forest Forest
4 Wetland Forest
5 Mining Industrial
6 Open Land includes inactive pasture open land
7 Participation Recreation open land
8 spectator recreation open land
9 Water Based Recreation open land
10 Multi-Family Residential High Density Residential
11 High Density Residential High Density Residential
12 Medium Density Residential Medium Density Residential
13 Low Density Residential Low Density Residential
14 Saltwater Wetland Water
15 Commercial Commercial
16 Industrial Industrial
17 Urban Open open land
18 Transportation Highway
19 Waste Disposal Industrial
20 Water Water
23 cranberry bog Agriculture
24 Powerline open land
25 Saltwater Sandy Beach open land
26 Golf Course Agriculture
29 Marina Commercial
31 Urban Public Commercial
34 Cemetery open land
35 Orchard Forest
36 Nursery Agriculture
37 Forested Wetland Forest
38 Very Low Density residential Low Density Residential
39 Junkyards Industrial
40 Brush land/Successional Forest
Page 6 of 6
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--_ 16
-__
�- EXISTING SNOW STORAGE AREA = f
-_
. o
a _
0 60 120
GRAPHIC SCALE
We
/V 5
SNOW STORAGE SKETCH = _