HomeMy WebLinkAbout2024-12-03 Stormwater Review Horsley W*itten Grolup
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112 water Street .611 Floor-Boston,MA 02109
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Or 77
November 25, 2024
GIs. Jean Enright, Planning Director
Planning Department
Town of North Andover
120 Main Street
North Andover, Massachusetts 011845
Re: Second Stormwater Peer Review
Proposed Swimming Peel--318 Salem Street
North Andover, Massachusetts
Dear I ,. Enright and Board Members.
The Horsley Witten Group,, Inc. (NW) is pleased to provide the North Andover Planning Board with this,
letter report summarizing our second review of the Watershed Special Permit Application for the
proposed swimming pool project at 318 Salem Street in North Andover, MA. The plans were prepared by
PFS Land Surveying, Inc. on behalf of Jamie-Lyn Pickles (Applicant). The project proposes the
installation of a 15-foot by 3,2-foot in-ground swimming pool, with a 4-foot concrete apron, and a 8-foot
privacy fence. The s,tormwater management for the proposed improvements includes a -foot wide, 2-
folot-d'eep infiltration trench along the edges of the concrete apron to allow stormwater from the concrete
apron to infiltrate into the ground during a storm event. In addition, the swimming pool will be equipped
with a non-backwash filtration system. The proposed pool is a 480 square foot (sf), permanent structure.
The footprint of the existing house is approximately 1,852, sf. A total of approximately 920 sf of additional
impervious area including the pool and concrete apron is proposed within the 25,000 sf parcel.
The residential lot is located within the watershed Protection District and was created in 191801, pre-dating
the October 24, 1994 implementation of the bylaw., Awetland resource area exists at the west corner of
the parcel, northwest of the proposed work, and existing flagging was confirmed by the North Andover
Conservation Commission. The proposed pool location is within the 325-foot Non-Discharge Buffer to a.
wetland resource within the watershed Protection District, and the proposed limit of disturbance is greater
than 100,feet from the edge of the bordering vegetated wetland `W). In accordance with §1 g 5-4.1 g B.
(2) of the North AndoverZoning Bylaws, any surface or subsurface discharge of stormwater within the
Non-Discharge Buffer Zone is only allowed after a special permit has been granted by the North Andover
Planning Board.
The following documents and plans were received, by Nw in response to our initial review dated
November 18,, 2024:
Memorandum, Peer Review Comments, 318 Salem Street, North Andover, Massachusetts,
prepared by PFS Land Surveying Inc., dated November 20, 2024 1 page);
Watershed Special Permit, Project.Description and Supporting Documentation, 318 Salem Street,
North Andover, Massachusetts, prepared by PFS Land Surveying, Inc., dated October 14, 2024,
revised November 22, �0�4� (7pages);
National Flood Hazard sayer FIRMette, dated June 18,, 2024 1 page), and
Stormwater Remediation Plan in North Andover, 318 Salem Street, North Andover,
Massachusetts, prepared by PFS Land Surveying, Inc., dated October 14, 2024, revised
November 20, 2024, (sheets 1 and 2 of 2).
rsley%tf .c orn [--lo l l e n G i re IM F ors ley i tl w Inc.
Town of North Andover
November 25, 2024
Page 2 of 3
Stormwater Management Design Peer Review
In accordance with §195-4.19. B. (4)All construction in the Watershed Protection District shall comply
with best management practices for erosion, siltation, and stormwater control in order to preserve the
purity of the groundwater and the lake;to maintain the groundwater table;and to maintain the filtration
and purification functions of the land.
The following comments correspond to our initial peer review letter dated November 18, 2024. Follow up
comments are provided in bold font.
I. In the Watershed Special Permit Application, the Applicant states that the section of Zoning
Bylaw that the Special Permit is being requested for is §195-4.19 C. (2)(a) and §195-4.19 C.
(2)(c). However, the Drainage Report states that the pool construction is outside of the 250-foot
Non-Disturbance buffer from the mean annual high water of Lake Cochichewick. HW
recommends that the Applicant clarify whether the proposed work is located within the 250-foot
Non-Disturbance Buffer Zone or within the 325-foot Non-Discharge Buffer Zone. HW
recommends that the Applicant include a locus map depicting the applicable buffer zone(s) and
the watershed protection district area.
November 25, 2024: The Applicant provided clarification in the Memorandum dated
November 20, 2024 that the Watershed Special Permit Application should reference §195-
4.19. B (2). No further action is requested.
2. The Applicant is subject to the requirements of§1 95-4.1 9 B., "Non-Discharge Buffer Zone"for
work between 100 feet and 325 feet horizontally from the edge of all wetland resource areas
located within the watershed. §195-4.19 B refers to§195-4.19 A (3)for Prohibited Uses. It is
HW's understanding that the proposed pool is not considered a prohibited use per 195-4.19 A(3)
and is considered an allowed use in Residence 3 District per§195-4.2 C.
November 25, 2024: No action requested.
3. In the watershed Special Permit Application, the Applicant states that the proposed project
entails "installation of an in-ground swimming pool, patio, and perimeter fence within the
watershed of Lake Cochichewick." The Stormwater Remediation Plan indicates a patio adjacent
to the existing structure. The proposed impervious area indicated in the Drainage Report includes
the proposed pool and the concrete apron surrounding the pool. HW recommends the Applicant
clarify if the patio is an existing structure or is included in the proposed construction work.
November 25, 2024: The patio has been labeled as an existing structure on Sheet 2 of the
Stormwater Remediation Plan. No further action is requested.
4. The Applicant has included a silt sock surrounding the proposed pool construction area. The silt
sock appears to end at the edge of the patio. HW recommends that the Applicant clarify if the
patio has a raised edge to prevent stormwater from flowing towards the western side of the
existing house. HW recommends that the Applicant include additional erosion control measures
on the Plan, including the location of stockpiles and additional mulch sock or silt fence
surrounding the stockpiling area for erosion protection.
November 25, 2024: The Applicant has revised the Stormwater Remediation Plan to extend
the silt sock to a stabilized construction entrance. The Applicant has included the
proposed location for stockpiles. HW recommends that the Applicant includes additional
mulch sock or silt fence surrounding the stockpiling area for erosion protection.
5. The Applicant has not included a proposed construction entrance/exit. HW recommends that the
Applicant include the location of the proposed construction access area and any erosion control
measures, such as construction matting to limit the tracking of sediment offsite or onto the
driveway, on the Site Plan.
K:1Projects12024124018 Town of North Andover124418F 318 Salem
Street\Report1241125_2ndSWPeerReview 318SalemStf-eet.docx
Town of North Andover
November 25, 2024
Page 3 of 3
November 25, 2,024: The Applicant has included a stabilized construction entrance and
associated detail on Sheet 2 of the Stormwater Remediation Plan. No further action is,
requested.
6. In the Drainage Report, the Applicant stated that a copy of the Flood Insurance Rate Map is,
attached. HW did not receive a Flood Insurance Rate Map for review.: HW recommends that the
Applicant provide this map to the Planning Board.
November 251, 2024: The Applicant has provided the National Flood Hazard Layer FIRMette.
No further,action is requested.
T. The Applicant provided''an Operation & Maintenance (O&M), Plan as part of the Drainage Report.
HW recommends that the Applicant provide a signed O&M Plan prior to land disturbance.
November 25, 2024: Suggested Condition of Approval.
81. HW recommends that the Applicant include an inspection and maintenance log as part of the
O&M Plan for use by the homeowner.
November 25, 2024- The Applicant has included an inspection and maintenance log in the
O&M Plan. No further action is requested.
9. The Stormwater Remediation Plan indicates that Salem, Street is north of the property, but,Salem
Street is located southwest of the property. The d:istances,from the edge of the property to the
existing structure are inconsistent with the scale of 114=40' as listed on the Plan. HW recommends
that the Applicant review the north arrow and scale bar and revise the Plan accordingly.
November 25, 2024: The scale has been updated accordingly to 1" =201'. The north arrow
on the locus map of the Stormwater Remediation Plan is shown correctly; however, the
assumed north arrow on Sheet 1 of 2 is illustrated incorrectly by almost 180 degrees,
causing confusion.
10. HW agrees that the infiltration trench surrounding the concrete apron will provide adequate
stormwater management for the additional impervious surface. No further action is required.
November 25, 2024: No action requested.
Conclusions
HW recommends that the North Andover Planning, Board require the Applicant to address the two
outstanding recommendations as part of its review process. We appreciate the opportunity to assist the
Town of North Andover with this project review, Please contact Janet Bernardo at 508-833-6600 or at
Lbe,rnardo@hor,sleyAiLLtg�n.com if you have any questions regarding these comments.
Sincerely,
............
Janet Carter Bernardo; P.E. Josephine Gustavesen
Principal Environmental Scientist
KA""rojects\2024\24018 1-own of Nord"i Andover\24018F 318 Salern
Sti-ee,t\Rel)orl\241125-2tidSWPoerReview-318,Salem Sti-eet,(Jo(,,x
Horsley Witten Group
Sustaillable Environmental Solutions
112 water Street.6,0 door Boston,MA 02109
November 18, 2024,
s. dean Enright, Planning Director
Planning Department
Town of North Andover
120 Main Street
North Andover, Massachusetts 01845
e: Initial Stor�mwater Peer Review
Proposed Swimming Pool 318 Salem Street
North. Andover, Massachusetts
Dear Ids. Enright and Board Members:
The Horsley Witten Group, Inc. (HW) is pleased to provide the North Andover Planning Board with
this letter report summarizing our initial review of the ' "watershed Special Permit Application for the
proposed swimming pool project at 318 Salem Street in, North Andover, MA. The plans were
prepared by PFS, Land Surveying, Inc. on behalf of Jamie-Lyn Pickles, (Applicant). The project
proposes the installation of'a 15-foot by 2-foot in-ground swimming pool, with a 4-foot concrete
apron, and a 6-foot privacy fence. The storrnwater management for the proposed improvements
includes a 2-foot wide, 2-foot-deep infiltration trench along the edges of the concrete apron to allow
storm rater from the concrete apron to infiltrate into the ground during a storm event. In addition, the
swimming pool will be eq ipped with a non-backwash filtration system. The proposed pool is a 480
square foot sf permanent structure. The footprint of the existing house is approximately 1,852 sf. A
total of approximately 920 sf of additional impervious ,area including the pooll and concrete apron is
proposed within the 25,000-sf parcel.
The residential lot is located within the Watershed Protection District and was created in 1980, pre-
dating the October 24, 1994 implementation of the bylaw. A wetland resource area exists at the west
corner of the parcel, northwest of the proposed work, and existing flagqlinq was confirmed by the
North Andover Conservation Commission. The proposed pool location is within the 325-foot Non-
Discharge Buffer r to a wetland resource within the Watershed Protection District, and the proposed
limit of disturbance is greater than 100 feet from the edge of the boirdering vegetated wetland (BVW).
In accordance with §195-4.19 B. (2) of the North Andover Zoning Bylaws, any surface or subsurface
discharge of storrnwater within the Non-Discharge duffer ?one is only allowed after a special permit
has been granted by the North Andover Planning Board.
The following documents and plans were received by HW
• Watershed Special Permit Application, proposed Swimming P�oo:l —318 Salem Street, North
Andover, I" assachusetts,, dated January 31, 2024 3 pages),
• watershed Special Permit, Project Description and Supporting Documentation, 318 Salem
Street, Noirth Andover, Massachusetts, prepared by PFS Land Surveying, Inc., dated
October 14, 2024 7 pages);
• Stormwater Analysis, 318 Salem Street, stamped by Richard C . Beati, dated October 14,
2024 1 page);
• NOAA Precipitation Frequency data 4 pages);
Horsk-s.yWitterixorn 91 @ H o rs,I. i iffe n Group, Inc.
Town of North Andover
November 18, 2024
Page 2 of 3
• Web Soil Survey with Soils (3 pages);
• Soil Map--314 Salem Street, North Andover, MA, dated October 7, 2024 (6 pages);
• Map Unit Description, dated October 7, 2024, (6 pages);
• Abutter List (3 pages); and
• Stormwater Remediation Plan in North Andover, 318 Salem Street, North Andover,
Massachusetts, prepared by PFS Land Surveying, Inc., dated October 14, 2024, revised
November 2, 2024, (Sheets I and 2 of 2).
Stormwater Management Design Peer Review
In accordance with §195-4.19. B. (4)All construction in the watershed Protection District shall
comply with best management practices for erosion, siltation, and stormwater control in order to
preserve the purity of the groundwater and the lake;to maintain the groundwater table; and to
maintain the filtration and purification functions of the land.
HW has the following comments regarding the proposed stormwater management design.
I. In the Watershed Special Permit Application, the Applicant states that the section of Zoning
Bylaw that the Special Permit is being requested for is §195-4.19 O. (2)(a) and §195-4.19 O.
(2)(c). However, the Drainage Report states that the pool construction is outside of the 250-
foot Non-Disturbance buffer from the mean annual high water of Lake cochichewick. HW
recommends that the Applicant clarify whether the proposed work is located within the 250--
foot Non-Disturbance Buffer Zone or within the 325-foot Non-Discharge Buffer Zone. HW
recommends that the Applicant include a locus map depicting the applicable buffer zone(s)
and the watershed protection district area.
2. The Applicant is subject to the requirements of§195-4.19 B., "Non-Discharge Buffer Zone"
for work between 100 feet and 325 feet horizontally from the edge of all wetland resource
areas located within the watershed. §195-4.19 B refers to §195-4.19 A (3)for Prohibited
Uses. It is HW's understanding that the proposed pool is not considered a prohibited use per
195-4.19 A (3) and is considered an allowed use in Residence 3 District per§195-4.2 O.
3. In the Watershed Special Permit Application, the Applicant states that the proposed project
entails "installation of an in--ground swimming pool, patio, and perimeter fence within the
watershed of Lake cochichewick."The Stormwater Remediation Plan, indicates a patio
adjacent to the existing structure. The proposed impervious area indicated in the Drainage
Report includes the proposed pool and the concrete apron surrounding the pool. HW
recommends the Applicant clarify if the patio is an existing structure or is included in the
proposed construction work.
4. The Applicant has included a silt sock surrounding the proposed pool construction area. The
silt sock appears to end at the edge of the patio. HW recommends that the Applicant clarify if
the patio has a raised edge to prevent stormwater from flowing towards the western side of
the existing house. HW recommends that the Applicant include additional erosion control
measures on the Plan, including the location of stockpiles and additional mulch sock or silt
fence surrounding the stockpiling area for erosion protection.
5. The Applicant has not included a proposed construction entrance/exit. HW recommends that
the Applicant include the location of the proposed construction access area and any erosion
control measures, such as construction matting to limit the tracking of sediment offsite or
onto the driveway, on the Site Plan.
K:IProjects12324124018 Town of North Andovei,\24018F 318 Salem Street\Reportl241118-SWPeerReview 318SalemStr•eet.docx
Town of North Andover
November 18, 2024
Page 3 of 3
6. In the Drainage Report, the Applicant stated that a copy of the Flood Insurance Rate Map is
attached. NW did not receive a Flood Insurance Rate Map for review. HW recommends that
the Applicant provide this map to the Planning Board.
7. The Applicant provided an Operation & Maintenance (O&M) Plan as part of the Drainage
Report. HW recommends that the Applicant, provide a signed O&M Plan prior to land
disturbance!.
8. HW recommends that the Applicant include an inspection and maintenance log as part of the
O&M Plan for use by the homeowner.
9. The Stormwater Remediation Plan indicates that Salem Street is north of the property, but
Salem Street is located southwest of the property. The distances from the edge of the
property to the existing structure are inconsistent with the scale of 1"=40' as listed on the
Plan. HW recommends that the Applicant review the north arrow and scale bar and revise
the Plan accordingly.
10. HW agrees that the infiltration trench surrounding the concrete apron will provide adequate,
,
stormwater management for the additional impervious surface. No further action is required.
Conclusions
HW recommends that the North, Andover Planning Board require the Applicant to address these
recommendations as part of its review process. We appreciate the opportunity to assist the Town of
North Andover with this project review. Please contact Janet Bernardo at 5081-833-6600 or at
.com ibe rdo��horsle�itten�� if you have any questions regarding these comments.,
�rn a�
Sincerely,
11's-J
Janet Carter Bernardo, R.E. Josephine Gustavesen
Principal Environmental Scientist
KAProjects\2024\240'18 Town of North Andover\24018F 3,18 Salem Sti-eet\Report\24,1118.-,9WPeerReview--318 paler-nsti-e et.(Jocx
?morandum To: Ms. Jean Enright, Planning Director Date: November 20, 2024
Town of North!,Andover
Planning Department
120 Main Street
North Andover, Massachusetts 01845
Project 318 Salem Street
No.:
From: David Beati, P.F. Re: Peer Review Comments
PFS Land Surveying, Inc. 318 Salem Street
North Andover, Massachusetts 01845
PIFS Land Surveying has prepared this memo, in response to Peer Review Comments by the Horsley
Witten Group dated' Nolvember 18, 20,24 and offer the following:
1. Noted, The application should' have reference bylaw section 4.19.13(2) as the proposed work is within
the Non-Dis,charge Buffer Zone.
The proposed work location lies 161-feet from a tributary to Lake Cochichewick, cats well outside the
250-foot buffer zone of Lake Cochichewick itself We agree that this location warrants Special Permit
Review, and have designed the Storm water BMP to mitigate 15-times the required volume from our
analysis.
2. Agreed, the proposed polo] is an allowed use within the Residential 3 zoning district and not prohibited
within the Non-Discharge Buffer :one.
3. The patio is existing and is "at-grade
4. Proposed silt sock has been revised to extend to the stabilized construction entrance. A stockpiling
area has been added to the site plan.
5. A stabilized construction entrance has been proposed and added to the site plan.
6. Flood Insurance Map has been submitted with the application.
7. The O&M Plan has: been signed by the applicant.
8. Noted, an O&M log has been suggested to the applicant, and added to the application package.
9. The North arrow is listed as assumed and is properly shown on the locus map. The Plan
If you have any questions or need any additional information, please do not hesitate to contact me.
Sincerely,
David Beati, P.E.
F20,Balch Aven�ue
Groveland,MA 01834
(978)8191-,51203
LAND SURVEYING, INC. (800)220-6214 fax
www.pfsland.com
National Flood Hazard Layer FIRMette FEMA Legend
7106'11"11 42"40'57"N SEE FIS REPORT FOR DETAILED LEGEND AND INDEX MAP FOR FIRM PANEL LAYOUT
Without Base Flood Elevation(BFE)
Zone A,V,A99
6w i"@-m---, SPECIAL FLOOD With BFE or Depth Zone AZ AO,AH,Vi�,AR
HAZARD AREAS Regulatory Floodway
0.2%Annual Chance Flood Hazard,Area
of 1%annual chance flood with average
depth less than one foot or with drainagi
0 row" areas of less than one square mile zone)
Future Conditions 1%Annual
Chance Flood Hazard zone X
s.
Area with Reduced Flood Risk due to
OTHER AREAS OF Levee.See Notes.zone Ax
Area with Flood Risk due to Leveezone D
FLOOD HAZARD
NO SCREEN Area of Minimal Flood Hazard zone X
Effective LOMRs
OTHER AREAS Area of Undetermined Flood Hazard Zeno
BE—PP 177 7 R,
GENERAL Channel,Culvert,or Storm Sewer
STRUCTURES Levee,Dike,or Floodwall
202 Cross Sections with 1%Annual Chance
Water Surface Elevation
'MINIDUH a— — — Coastal Transact
MA
w— Base Flood Elevation Line(BFE)
Limit of Study
�7 Jurisdiction Boundary
Coastal Transect Baseline
OTHER Profile Baseline
FEATURES Hydrographic Feature
Digital Data Available
N
No Digital Data Available
MAP PANELS
Unmapped
Q
The pin displayed on the map is an approximatf
point selected by the user and does not represe
an authoritative property location.
This map complies with FEIVIA's standards for the use of
digital flood maps if it is not void as described below.
The basemap shown complies with FEIVIA's basemap
accuracy standards
The flood hazard information is derived directly from the
authoritative NFHL web services provided by FEMA.This map
was exported on 6/18/2024 at 10:225 PM and does not
reflect changes or amendments subsequent to this date and
time.The NFHL and effective information may change or
become superseded by new data over time.
This map image is void if the one or more of the following map
elements do not appear:basemap imagery,flood zone labels,
legend,scale bar,map creation date,community identifiers,
FIRM panel number,and FIRM effective date.Map images for
7105'34"W 42040'31"N
Feet 1:67000 unmapped and unmodernized areas cannot be used for
0 250 500 1:000 11500 2:000 regulatory purposes.
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9VERVIEW
The proposed pool project is located at 318 Salem Street and is depicted on
North Andover Assessors Map 37.B Lot 45. The parcel consists of 25,000±
square feet of land and is located on the northerly side of Salem Street at the
Intersection of Appleton Street. The pool construction is over 400 feet from Lake
Cochichewick, but Within the Watershed Protection District.
The lot was created In 1980, pre-dating the October 24, 1994 implementation of
the by-law. The pool construction is outside of the 250 foot Non-Disturbance
buffer and the 325 foot Non-Discharge buffer from the mean annual high Water
of Lake Cochichewick. A wetland resource area exists at the west corner of the
parcel, northwest of the proposed work, and existing flagging was confirmed by
North Andover conservation Commission, and located by this firm.
The proposed pool location is within 325 foot Non-Discharge buffer to a wetland
resource within the Watershed protection District, and 161+ feet from the edge
of the bordering vegetated wetland (BVW), as located by this firm. The project
Involves the construction of a 15'x32' in-ground swimming pool with a 4-foot
concrete apron, located in the rear yard of the existing house.
The lot is served by a municipal sewerage system so nitrogen and phosphorus
contributions to the groundwater will be minimal and typical of surrounding
residential uses. It is anticipated that permit approval will require that fertilizers
to be organic and slow release, free of phosphorus further minimizing chemical
impact to the groundwater.
No perennial streams are shown on or near the lot according to the USCS
Massachusetts StreamStats program and the North Andover Riverfront Map.
No wetland area will be disturbed as part of the proposed work.
A copy of the Estimated Habitat Map is not attached as there are no estimated
habitats of rare wetlands wildlife or certified vernal pools on or near the lot
according to the Natural Heritage and Endangered Species Program Web site
dated August 1. 2021.
A copy of the Flood Insurance Rate Map is attached. The parcel is not in the
floodplain per Flood Insurance Rate Map 25009CO236F, dated July 3, 2012.
Soils on the lot were mapped by the USDA Natural Resources conservation
Services (MRCS) as predominately Sutton Fine Sandy Loam, 0% to 3% slopes,
and are moderately well-draining.
OW.KWATER MANAGEMENT
Existing conditions present a gently sloping side yard, northwesterly towards the
wetlands and brook, and is presently without stormwater measures.
Since the project consists of work on a single family house, the project is exempt
from the MA DEP Stormwater Management Standards.
Stormwater remediation for the site is proposed by the conveyance of all runoff
from the proposed pool area into a 2'wide stone infiltration trench, at a depth of
2-feet. The trench will circumvent the pool and deck, and will be encased in
polyethylene filter fabric.
During construction, the perimeter of the work will be protected with staked
erosion barrier products to prevent migration of sediment from the site until final
stabilization.
This BMP has been proposed to manage 214.4 cubic feet of stormwater runoff
and to mitigate upwards of the too-year, 24-hour intensity storm.
L"DSCAPING
All downgrade disturbed areas are proposed to be stabilized with loam and seed.
UPPOR NQ DoGUMEWA ION
1. Encourage the most appropriate use of land
The proposed use of a pool at a single family dwelling is appropriate as the site
is located within the R3 zoning district and swimming pools are common
appurtenances on single family properties.
2. Preventing overcrowding of land
The proposed work complies with the required zoning setbacks and is a ground
level pool. The pool shall be located in the backyard and enclosed with a new
fence.
3. Conserving the value of land and buildings
The proposed project should enhance the value of the properly and provide
additional recreational value for the residents.
4. Lessening congestion of traffic
The proposed project will not increase the average daily traffic from the lot and
the existing driveway is sufficient to accommodate friends or relatives as may
visit the site occasionally to enjoy the pool with family or friends.
5. Preventing undue concentration of population
The proposed pool is an enhancement to a developed lot with an existing single
family home which will not typically concentrate population. occasional visits
from family or friends arc generally not considered un undue concentration of
people.
6. Providing adequate light and air
The completed pool project will not adversely impact the light or air quality of
the surrounding areas.
7. Reducing the hazards from fire and other danger
The proposed project will not pose any hazards from fire or other danger.
S. Assisting in the economical provision of transportation, water, sewerage,
schools, parks, and other public facilities
The addition or a pool to the lot will not negatively impact the public facilities or
utilities noted above.
g. Controlling the use of bodies of water, including watercourses
The proposed pool project is on a lot that does not directly abut Lake
Cochichewick and will not have any impacts on present use of the Lake or its
tributaries.
10. Reducing the probability of losses resulting from floods
The property is not within a floodplain reducing the probability of the work
causing damage and loss.
11. Reserving and increasing the amenities of the Town
The proposed project will result in an improvement to the property and increased
property tax which will help to increase funds available to the Town for public
amenities.
PROOF of No REASONABLE ALTERNATIVE-LOCATION
The proposed work is proposed in an optimal location for the use as the lot is
encompassed entirely by the 325 foot non-discharge buffer. Additionally, the
parcel is encumbered by the wetland to the northwest, and a sewer easement
along the north and east sides of the lot, minimizing the potential for alternative
locations to place the pool on the lot.
EVIDENCE of APPROVALL FROM MASS DEP
No approval from Mass DEP is required for any industrial wastewater treatment
or disposal system or any wastewater treatment for a system of fifteen thousand
gallons per day capacity as none arc proposed.
EVIDENCE-ON SITE OPERATIONS WILL NOT CREATE CONCENTRATIONS of
NITRO QENI IN QR0 UNDWATI R.EiREATER.THAN`f I-E FETE ERALL LEMIT D OWN,
EiRADIENT of THE PROPERTY
The construction of the proposed pool will employ all the best management
practices suitable for a pool concerning erosion and stormwater control.
Sediments will be managed by installing an erosion control barrier to keep
sediments from entering the downhill wetland. The pool is not a source of
nitrogen and phosphorus so there will be no increases in nitrogen concentrations
downgradient of it.
PR,0JECTIONS of DOWN. QRADIENT CoNCENTRAMON of NITRO
PHOSPHORUS, D OTHER RELE-VART CHEMICALS AT PROPERTY B-oUNDARIES3
The proposed pool will not create concentrations of nitrogen or phosphorus, or
other relevant chemicals, at the property boundaries.
WRITTEN GERMFIC TION
I, David R. Beati certify that the work depicted on the Plan titled "Stormwater
Remediation Plan N 318 Salem Street North Andover MA, dated October 14,
2024, prepared by PFS Land Surveying, LLC will not result in the significant
degradation of the quality or quantity of water entering Lake Cochichewick.
David R. Beati, MA P.E. #454 19
OPERATIONS & MI-A MTENANCE FLAN:
System owner:
Jaime-Lyn Pickles
318 Salem Street
North Andover MA 01845
IrCiRD ND SW"I_.N.Q POOL
0 The proposed swimming pool shall be equipped with a non-backwash
filtration system. A Pentair System 3@ Modular Media Filter is proposed.
0 The property owner shall engage a water hauling company to pump the
water and truck the water offsite anytime the pool needs to be drained. Final
disposal of the water by the water hauling company shall be in accordance with
all federal and state regulations.
0 Pool water shall be dechlorinated by not adding chemicals and letting the
pool water sit for a minimum of 10 days. At that point, the pool water can be
pumped into the proposed infiltration trench system during normal dewatering
following storm events.
0 Pool chemicals shall be properly stored according to manufacturers' labels
in an enclosed shed or garage to ensure proper containment of any spills or
drips.
POOL FILTRATION SYSTEM
0 Pool filtration system to be cleaned and maintained in accordance with
manufacturer specifications detailed in the attached owner's manual.
0 once operating pressure reaches 10 PSI above initial operating pressure,
inspect and clean filter element. Filter element should be cleaned with hose and
drained into stone infiltration trench.
0 on a weekly basis, debris should be removed from skimmer basket. The
pump should be stopped, release all pressure, and remove trap cover and basket
to remove any additional debris. Air filter should be bled each time system is
started.
WF LTPvATION TRENCH
This operations & Maintenance Plan has been prepared to comply with the
provisions set forth in the Massachusetts Department of Environmental
Protection (DEF) Stormwater Management Standards.
Structural Best Management Practices (BMPs) require periodic maintenance to
ensure proper function and efficiency in pollutant removal from stormwater
discharges that would othelwise reach wetland resource areas untreated.
Maintenance schedules found below are recommended in Department of
Environmental Protection's Massachusetts Stormwater Handbook and as
recommended in the manufacturer's specifications.
The stormwater management system owner and the party responsible for
maintenance of the stormwater management system shall be the property owner
and their designated employees.
• Inspect and clean every six months and after every major storm event of
0.5 inches in a 24-hour period. Remove accumulated sediment, trash, debris,
leaves and grass clippings.
® Remove tree seedlings before they become firmly established.
• Inspect the trench 24 hours or several days after a rain event to look for
ponded water. If there is ponded water at the surface of the trench, it is likely
that the trench surface is clogged,
• To address surface clogging, remove and replace the first layer of stone
aggregate and filter fabric. If the water is ponded inside the trench, it may
indicate that the bottom of the trench has failed.
• To rehabilitate a failed trench, all accumulated sediment must be stripped
from the bottom, the bottom of the trench must be scarred and tilled to induce
infiltration, and all of the stone aggregate and filter fabric or media must be
removed and replaced.
Inspection and Maintenance Log.
Date Inspector condition Maintenance
Performed
Jaime-Lyn Pickles
OWNER,-IS SIB ATUR