HomeMy WebLinkAbout01/24/2020 - Langan Response to Woodard & Curran Peer Review Comments - - 1450 Osgood Street S M LAK & VA G AN LLP
iian Goldberg,Chair,
Flannin Board
February 18,2020
Memorandum,dated January 24,202%from Ti O'Neil and Nate Kirschner of
Langan Engineering to Jim Stanford,DPW Director (Response to Woodard&Curran
Sr S
ustempeerreview letter dated Nqvember.11 2019)
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B oylsto n meet..Suite 510 Bosta ij,MA 02199 T:617-824-9100
To Mr. Jim Stanford., Director
Department of Public Works
Town of North Andover
Fro mit Tim O'Neill, P.E.
Nate Kirschner
COPIED: Mee Utsey Hill wood Enterprises,, L.P.
John Smolak Sm olak&Vaugh an LLP
Date: January 24,, 2020
e: Response to Woodard &Curran Sewer System peer review comments
North Andover Fulfillment Center
1600 Osgood Street, North Andover, Massachusetts
Langan Project No.- 140182701
Enclosed, please find our responses to comments raised by Woodard ur( n in heir peer
review comment memo dated November 11. 201 S. Each comment is followed by our response
in bold.
1: The existing office building on Osgood Street (Lot ) is to remain and the existing
b u i Id 1 ngs to the rear of Lot A are to be d e m olished and replaced with the new distribution
facility(Lot ).
Cornment Response:Noted.
2. Them are two sever pump stations for the proposed development- one for the existing
off ice building on Lot A Iaboled Ozzy Properties Pump Station and one for the p ro posed
distribution facility labeled New Tenant Pump Station. (Overall Utility Plan, Drawing
CU 100 and Utility Plans 1-V, Drawings in U1 01-C 1 )
Commenf Response.,Noted, Pumps are now labeled Lot A Pump Station and Lot
Pump Station.
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. Both the OzzV Properties Pump Stat[on and the New Tenant Pump Station discharge to a
proposed valve vault at the rear of Lot 13 near the two existing force mains to GLSD, then
from the vault to the existing force main to GLS . Both force mains are shorn as 2x'
diameter which appears small for this application. (Utility Plan raring CU10 #.
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Comment Response, Final sizing calculations and discharge connection details to
existing infrastructure will he provided upon obtaining local approvals. Construction
documents Mill provide details and calculations necessary to confirm appropriate
sizing.The above vAtl be included as a condition of approval for Lots A and B.
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MEMO Langan Project No. 140182701
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January 24, 2 — rage 2 of
4. There are two existing parallel " force rains from the existing wastewater treatment
building to GLSD.The drawings do not indicate which force maim the now force mains tie
into.(Utility Plan -brewing 105
Comment Response: Specific detail on the connection to existing infrastructure
will be provided upon obtaining local approvals and addressed in construction level
documents. The above will be included as a condition of approval for Lot B.
The drawings do not include design details for the following:
zzy Properties Pump Station
Now Tenant Pump Station
Valvea u it
Tie-ire to force rain to G LSD
The pump design conditions were not included and, as a result the f ore rain diameters
could not be verif ie ,
Comment!Response: Additional details will be provided in the construction p o fruction level
documents. Should further specific Information be required during the p r Min
phase#please reach out to our office and detailed designs will be developed based
on the most current information available.The above will be included as a condition
of approval for Lots A and B.
6. The location of the two ci tin " force mains from the existing ast grater treatment
building are not shown accurately and are difficult to see.(UtilityFlan Drawing CU 10 )
Comment Response: Based on record drawings and field observations,the existing
sanitary force main is shown in the correct location. To ensure the location of the
lino is accurate, a call out has been added to sheet CU105 which states the
following.-
"Contractor to performer test pit to confirm the material,size,horizontal and vertical
location of the existing sanitary force main prior to construction.
7. The Oar Properties Pump Station is located in the middle of the paved parking lot either
under a parking space or in the travelled way, presumably with are access hatch, (Utilfty
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Plan 11 -1 ra in U o3) it is recommended that the station be located in a non-pared
area not accessible by vehicles. The New Tenant Pump Station is not located in the
roadway or parking lot UtiIity PIan II- r !ng C U 102).
Comment Res ons : The Ozzy properties pump station is Iocat d In the drive aisle
for the following reasons.The applicant would request the pump station to remain
in the location as shown. k
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The pump station is located below grade, in a low traffic drive aisle and a
In a location where cars cannot park directly on top of access panels. If
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MEMO Langan Project No. 1401 E32701
January 2 ,, 2020—Page 3 of
an emergency occurs and the panels need to be opened,the arnount of
cars blocked In parking stall is limited and no egress routes will b
impacted.
�- The access panels will be cleared of snow during regular plying.
- The pump station Is t o large to fit within an interior parking lot
landscaped island. It cannot be relocated to the landscaped area to the
west as it is Intended for Snow storage and would be insc m1ble during
Winter,
Moving the pump station to the landscaped area next to the building
would conflict with existing below grade utilities to rernain and the close
proximity to the building is not ideal as fumes may be ncrticeable by
occupants.
0 Force mains should avoid 90 degree kends,
Comment t Response: In the final condition*90 degree bends in the force main will
be wielded., ff unavoidable, appropriate fittings and equipment will be installed t
ensure operation.
f Force mains should have air release valves at any high points and cleanouts at any lover
points.
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Great Response: Air release vents and cleanouts will be installed at
appropriate location in the final design., A note has been added to sheet
under the Utilities section reflecting this comment.
. Should the Ozzy properties building wish to tie into the proposed Osgood Street gravitV
sewer, approximately 900 feet of 8 sewer would be required from the manhole before {
the Ozzy Properties Pump Station to Osgood Street via Subdivision Way, Lot D.The invert
of manhole SM H-18 before the 0 zzy Properties Pump Station is at elev Lion 33.71. 90 0r
feet of ' sewer at a slope of 0,004 f ft would result in an invert elevation of
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approximately 30.0 at a manhole In Osgood Street at the polra of tie-in to the proposed
municipal sever, (Utility Plan III-Drawing C 1 o ) The road surface in Osgood Street
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where the manhole would he located is at an approximate elevation of 46.5. This would
require an excavation of approximately 16.5 feet,which would be an acceptable depth for
sewer construction at this location to accommodate Ozzy properties by gravity. If this is
desirable,, the gravity sewer should be installed at the time the proposed l i tributr`on
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Facility is constructed and plugged at the manhole before the pump station.
Comment Response: Doted. As design drawings for the public sanitarV line within
Osgood Street becomes available,, a gravity line connection from the Ozzy
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Properties buil
ding Will be considered. The pump station is currently shown as a
conservative solution based on readily available sanitary access. �.
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11, For the New Tenant Building to tie into Osgood Street approximately 1,300 feet of 8' a
sewer would be re qtj it . The invert at manhole SMH-13 outside the New Tenant P u i n t
p
Station is . . 1,300 feet of;B sewer at a slope of 0.004 f ft would result in a n invert
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Langan Project No. 140182701
January 24,, 2 —Page 4 of
elevation of approximalely 19,0 at a manhole in Osgood Street at the point of tie-Ire to the
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prop osed mun! r sl sever. Mil ity Plans III &I ra in gs C U 103& 1 )The road surface
in Osgood Street where the manhole would be located is at an approximate elevation of
- . This would require an excavation of approximately 27,5 feet,which would not be an
acceptable depth for sewer construction at this location. Therefore the New Tenant
building would need to tie into the proposed Osgood Street sewer bV pumping.
Comment Response: loved, A Pump station for the new tenant to tie Into the
future public sanitary main within Osgood Street is anticipated.
1 . Should the New Tenant wish to tie into the proposed gravitV sewer in Osgood Street E
the future, it is recommended that a force main be constructed from the New Tenant
Pump Station to Osgood Street when the Distribution Facility is constructed. (Utility Plan
III &IV-Drawings CL)103 & 1 valving and discharge piping within the pump station or
s va Ive vault could be configured to accomplish and the corresponding va Ive closed.
Comment Response: Noted. Installation of the appropriate infrastructure during
the construction of the distribution facility will be coordinated with possible future
connections in mind.
13. Assuming the Ozzy Properties Building sewer line to the existing pumpingta`ion must
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remain to service during demolition of the existing building(s) and construction of the
proposed Distribution Facility, several apparant conflicts appear on the drawings a
follows:
Utility Plan ill-Drawing CU 103—The existing clay sever is not shown from
the existing SIGH near D-1 MH-6 200 feet southwest to are existing SMH faint
shown, then another 60 feet where it connects to the existing 8"' clay serer}
(This can be deduced from information on Drawing gyring VL1 .As a result. there
appear to be several conflicts as falfovs:
Comment me Response. Due to inaccessible sanitary manholes and gaps in
available record data, not all existing sanitary lines were able to be shown
with accuracy on the drawings. Further investigation is required t
determine the exact location and routing of the existing sanitary service
laterals to the ekisting pump station.A note has been added to the sheet
CS002 under the Utilifies section which reads as follows:
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"Prior to site demolition,the contractor is to confirm the location and #
routing of all sanitary line penetrations for the buildings to remain on
Lot A,known as buildings 20 and 21.A document shall then be prepared
by the engineer of record which identifies a method to provide active
an�ta r services o buildings 20 and '1 throughout opt the construction
process.If the existing sanitary network is to be utilized throughout the
demolition and construction phases shall be identified. Based on this
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Langan Project No,, 140182701
January 2 ., 202 W Page 5 of
information, a staged program will be developed identifying when critical
san itary service equipment for b u 1ldings 20 and 21 mey be taken off[in e.,
o The proposed 8 severer from S MH-1 g to SM -1 7 is in the same location
as the existing clay serer from 0' to o' north of SM H-1 6 as Dr ell a
the existing SMH. It also appears that the proposed 15" HDPE drain and
D-1 C are in the same location as both the existing and proposed
sewers and the existing SM i
Comment t Response:e: SM14-1 has been shifted north and a
connection to the existing sanitary manhole has been proven,
The sanitary connection to the existing building mentioned above,
has been removed. The existing sanitary line in the proximity f
proposed SM H-1 6 is to be demolished and replace with the
proposed lino,
It appears that the proposed "` drain from C-1 EX YI D-1 t -1 - *1 ,
In conflict with the existing clay serer just south of the a i stin g S M H
Comment Response: The sanitary line has been relocated as
discussed in the response above*The conflict has been eliminated'.
The proposed U FW(fire protection line) crosses the a istir g surer just
north of Sid H-16 and is shown very close to the existing SM H.This
should be checi a d for confIiets.
Comment Response:All fire lines and sanitary crossing in close
proximity locations have been checked for conf HeU.
Utility l lan I rawl ng C U 104—The existing 8t` clay severer crosses both the 4
proposed DFVV and electric lines east of the proposed Distribution Facility and
should be checked for conflicts.
Comment e, pons ,All fire lines and sanitary crossing in close proximity
locations have been checked for conflicts#
Utility Plan 11 Drawing C U 104 and Utility Plan V-Drawing CU 1 -The existing
"# clay sewer continues through the proposed Distribution facility but Should
remain in service in order to serge the existing y Properties Building unless
other arrangements are in place,
omment Response:All fire lines and sanitary crossin inclose proximity
locations have been checked for eonflictsr
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0 t!lity Plan V Drawing CU 1 --Th9 e isti ng 8 c lay sewer crosses the prop o ed
FV1, gas and electric linos west of the proposed Distribution Facility and should
e checked for conflicts.
COmment Response:All f1lrre Imes and sanitary crossing in close pr xim ity
locations have been cbecked for conflicts.
0 Utility Pla n V- r wi ng C U 105--The existinc wast r ter treatment facility are dfor
pump station appears to be required to be demolished In order to construct the
proposed Distribution 'Hit r but should remain in service in order to servo the
existing Ozzy Properties Building unless other arrangements are in place.
Comment Response.,All fire lines and sanitary crossing in close
locations have been checked for conflicts,
1.tility Plan V-Dra in g C U 1 -The existing force main from th
e vstewtr
treatment facility and/or pump station must remain in service in order to r
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flow from the existing Ozzy Properties Building to GLSD unless other
arrangements ents are in place.
Comment Response:All fire lines and sa nits rV crossingin close p roximity
lotions have been checked for conflicts,
14. The details for sewer and force min bedding on Utility Details 1# Drawing CUB01
reference Wanna ernet Water and Sever. This appears to be incorrect.
Comment Response: The details for serer and force may bedding
ed e�r� been .
updated.
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We trust these responses and the enclosed revised material adequately address your
comments and concerns, Should you have any additional comments or concerns please
o net hesitate to contact us directly on 1 y 1 oo or n irs hner fan r
loneill@langan.com.
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