HomeMy WebLinkAboutConstruction Narrative with additional supporting docs. MMD Shooting application - Correspondence - 210 HOLT ROAD 6/1/2020 Pc—JP"-T
Construction Narrative
Proposed MMD Shooting facility,Holt Road, N. Andover, NTA.
Existing Conditions-
The I folt Road building was built between 1985-1986 and consists of a 5" reinforced concrete floor
slab on grade,reinforced and insulated 12" CNIU exterior walls,and a steel bar joist and rigid
insulated roof with ETDM roof membrane. The existing wood-frame office space is built with
acoustical tile ,,g ,ceiling
s,gypsum board,carpet and other standard Finishes and most likely will be
demolished.
Pr sed I'acility
The new facility will occupy half(7500so of the existing 151"100sf building. A concrete block 25' x
75' two-level addition will be built at the rear. An inside fire separation wall will be built to separate
the new gun range facility from the remaining maintenance building use. The facility will be fully
handicap accessible and sprinkled.
The first floor will contain the entry/lobby,two live fire gun ranges, retail space,offices,members
lounge,bathrooms,and storage. The second floor will contain a lobby,two air gun (pellet) ranges,
two virtual training rooms,employee break room,bathroorns, storage,control room,lounge and
training room.
Live Fire Rana Construction
First floor live fire ranWs will be constructed on the existing reinforced concrete slab with solid-
grouted 8" and 12" CMU walls and a 10" precast concrete plank/2" concrete topping slab ceiling.
This new ceiling will also act as the floor for the air gun pellet ranges and virtual shooting theaters.
This construction type will encapsulate the live fire ranges in ballistic and sound attenuation
protect,1011.
I each live fire range contains individual shooter booths, a granulated rubber bullet trap behind the
targets at the far end, and a self-contained, filtered HVAC system,independent of the rrialin I IVA('-
systems serving the rest of the building.
I'lach shooting booth will have an individual target carrier system,mounted on a monorail,with the
ability to stop down range at fixed increments.
The building will have a sprinkler system installed. The piping and heads are spaced evenly on the
ceiling up to and including the bullet trap area. As well, range lighting is installed adjacent to the
sprinkler piping and heads. Both are protected with steel baffles, set at 4.5 de& angles,covered on
the exposed side with acoustical panel s/plywood.
Directly in front of the firing line,up to 12'down range,will be a safety ceiling;to absorb a
misdirected shot that could harm shooters or damage utilities. It consists of steel-panels with added
cold molded ballistic rubber panels, all suspended from the concrete ceiling.
The rear wall behind the shooters and side walls of each range will be covered with acoustic and
sound insulating panels attached with metal furring. Also,an acoustical the ceiling, suspended
behind the shooting booths,will have added layers oFsound insulation.
I.ive lire Range_Ventilation
L'ach range will be equipped with an individual purge style ventilation system. In keeping with the
attached ACGII I standards, (2) Airflow Systems model F480 3stage 1lepa filtration systems would
provide a 45 FPM face velocity across the shooting area. As discussed two F480's can be mounted
behind the bullet trap with insulated duct returning the purified air back to a manifold behind the
shooters to insure airflow is down-stream to the bullet trap area where it will exhaust though tJ�e
F480's and recirculate. A secondary fresh air system supplies and exhausts outside air to meet code.
Behind the shooting booths,high in the ceiling comer,will be a supply plenum.with individual
diffusers for each Firing lane. At the far end,above the rubber bullet trap,will be the exhaust return
plenum. Specific air flow movement across the ranges will be met as required by code. All air
handling units (supply and exhaust) will be mounted on ground slabs.
Range Doors and Observation Windows
Doors and observation windows into the range will be acousticOy rated to beep decibel levels
comfortable for customers not in the ranges themselves.
Air Gun Range Construction
Directly above the live fire ranges will be the air gun (pellet) ranges. The acoustical and ballistic
treatment for these ranges is different than live fire ranges,with decibel levels substantially less.
Pellets from an air gun are propelled using CO2 cartridges. Lead dust or fragtttents from pellets is
negligible and proper maintenance and cleanup procedures will be lit place.
No special ventilation system is required. Side walls will be constructed of grouted Cl1''fU and
acoustical blankets. The ceilings will be hung acoustical tiles with added sound-attenuation
Insulation blankets.
Pellet traps are usually a type of metal box located behind each target. The backstop behind the
targets and traps is plywood set at an angle with a thick layer of styrofoam attached.
Typically, there are no formal firing booths,but rather shooters use counters/chairs,lay prone or sit
on the Moor. 'Target trap systems can be used,either manual or hand cranked,to bring single targets
to and from the target line. Overall lighting is similar to lighting you would see in a school
classroom,with the possibility of directional lighting at each target,if required.
Co cs
The facility will meet the requirements of the Massachusetts State Building Code,NFPA I..ife Safety
Codes and.ADA Handicap Accessibility Codes.
kdal-itili('.j1l.-rtmivarcJi it.ectf .c�M1
603-436-8591 x12
cc: 'thcji�� �.m tz.tl7i-r�c�'clin r.c�,m
CLEAN AIRE TECHNOLOGY, INC.
P.O. BOY 380, 185 Main Street
BELMONT NH 03220
PHONE 603 267 7042
FAX 603 267 6533
March 9,2020
Kelly Davis,AIA
Port One Architects, Inc.
959 Islington Street
Portsmouth,NII 03801
Kelly:
Tom Rays and T enjoyed speaking with you and appreciate the positive comments and interest in
working together with you and-Jeff Thomson at TBI Recycling on the proposed MT%4D shooting range
with (2) G bay ranges 25'W x 9'1-It. In keeping with the attached ACGIH standards, (2)Airflow
Systems model F480 3stage Hepa filtration systems would provide you with a 45 FPM face velocity
across your shooting area. As discussed we agree that the two F480's can be mounted behind the
bullet trap with insulated duct returning the purified air back to a manifold behind the shooters to
insure airflow is down-stream to die bullet trap area wl-ere it will exhaust though the F480's and
recirculate. Note herein is the measurement:
9.5'x 50'x 45FPM = 21,375
21,375 x.75 = 16,031 CFM
This equates to two F480 Hepa Systems @ 800 CFM each
Optimal Exhaust
21,375 CFN1 x .25 = 5,343 CFM
Optimal Air snake-up
21,375 CFM x.20 = 4,275 CFM
As noted,the HVAC contractor may address air make-up or exhaust requirements or we can help assist
here.
Installation anal duct runs to be determined based on location and building features.
We look fora and to working with you.
Sincerely,
F LY=7. �CI..QRA31MifG
James W. McCormick
President---Sales
T ]9
fT I
�xx CA d8A
1302
figow
9
E
l
{i
I"
h r eft"T I'!.c R F'L N
Fr: ti;;,':::: �..� _ ::fir. �:;. •'" •5
M.
�{ S'i��•4��M�H.�.
t..
:;tea'::.. �' .. ,.� ,:� �•�. ;:. 3
"rkt:
_ ��-. �-- .., Yam: ::.s,• ,.:;�. .":��:'_�;::-�� . .
+V.
t-.
=f y;
�..
!��g' ^�F
'4:€ •�` �� '•[^ _ _ :.fir;.::�':-...�
mar•..y� _ Y'�...
MN
yw :. �}•�
V•.
I
.
yy l
F,
R
i
;,..... :s. ?::•:;�...;.".,.,:;.,kris:_::�::.." '�':::;,:
f
F::
,t
rr
Y
ry'!-
I
t:a
�:.
of
as .a
n..
n :a;
,
1
°d1
L.
f.y s.•.,5 :c. h
x .. ... .n .: