Stormwater Plan 1ARRE-I'Th"
59eerss P1,LC G vV&E a pi r-on Tj e n 9 LE igg
Stormwater PoUtifion Prevention Plan
j",61,the
Faiiirfield Professional Office Subdivision
prqposed on
Bay Road
17own of Queensbury, New Vork
Developed by
Legacy Land Holdings, LLC
May 1.5, 2007
Amended by JARRETF Erig1heers, PLL C Septe�iriber 20161
Introditc.tion
This stormwawr pollution llrcvcc ntjon Plan (SWPPP) is prepared for properly ovvned by Lcg�azy Land
Holding,% LU11, located on Bay Road in fli,e 117o�vn of QueensbUll-Y, NY, A. 17 1�0(, par ofQssionaj office
subdivision is proposied on the 26.16±- acrelot; elevert or the lou will be occupied by profiessional uflke
buildings, 5 lots will, be devel(q.)ed, M1,111 a setlior housing proj"t', and one lot will contain ne%N, stormwatex
I tlan--agg In Clit, ponds. 'Flie subdivision build OUt Will CHSAUrb n�iare than I acre ofdisftirbancQ, in aggregate, dius
as fu I I NY 8 1)II-X",, SPOt'S SM411) for this project i,s, required-
1711e, existing lot wa�r,i Undeveloped and origittaRy inClUded a mixture of'gra,ss, brush anc] tree Qkwer. NYSDIX
jurisdicLional wedan&; exist on the -south end of the parcei. Ali exisLi,ng gravel drive, extencls firom, the
subdivisd[c)n to Bay Road th,rough the parccL
As of 8q)tember 2016., two C011111,11er(Jal prqjl�,Cts mcupy 3, of (lie orighiaHy approved 16 subdivision lots, and
ThQ existing and currently proposQd
a proj:uosed senior ho,usflig cell Mill occupy 5 additiaaal lots.
developnient inductes less inipery I mus area than odghully pkinned (and designed), R)r the subdiviskml,
thu6brQ no 11,1odifilcaflons to the Qxj�aing stornmeater nianagenlent sy,.,,tearra. serving the, subidivision are
ncucssary
T'he prof)osed develop inent,on this property MfOltild increasc storm'svater runofffrom Elie site if'no mitigation we-,�
induded. This i-epott and the fblloming calculations dernolistraw 111r. ef,fed. of the (level opl-m-'Jit Of tfic�
property on storl-mmaW runoff and propose's, ithe necessary mitigation needecl to reduce runof'rtt) pre-
devolopment values. WSDEC requires the 10 Yr and 100, Yr storrns to be analyzed For flow rate mitigation,
..........
12 East Washiu,44em Street 18-792-2907
Glens Fallsp NY 1280,1
Fairfield Professional Office Subdivision May 2007
Storniwater Pollution. Prevention Plan Rvi d, Sept 20,16
and likewise, the, Town of Queensbury requires the 50 Yr storm to be managed.. The I Yr storm has been
calculated for Purposes of analyzing runoff for the extended detention requirements of the NYSD.EC.
Construction phasing
The project will not be phased but full build, out of' the projett may take several years. The current
stormwate,r design has been calculated to serve the future build out, as shovai on the subdiViSiOnl
drawings,, however individual lot designs are subject to change at the time of purchase and site plan review,
This WP'PP' must be revised if actual lot designs propose more, impervious area than is shown on the
attached drawings.
Eat]U"fiell EmmliuMnste Sto Lqg-e-
Construction chemicals will be stored in construction, trailers or off-site away from stormwater runoff. Aft
liter and constructiori, debris outside ofthe building will be cleaned up after each day"s work.
Idbulau An'ters,
There is a wetland within the immediate,, downstream vicinity of the project site. The stormwaler design has
been sized to accommodate the water quality volume to keep pollutants out of the existing wetland.
ERUSUN AND 5EINHEU.-CONTRUL,
The site will be most susceptible to erosion. and s,ed.iment problems during the construction phase of the
project. This can MUR in sedimentation in flao downstream wetland and perrawient stormwater control
devices. To prevent erosion during the construction phase, temporary erosion control measures will, be used,,
Silt fences and/or hay bate; dikes will be eve,cted down slope of applicable construction aras to prevent
sp,dirne,nt frOM traveling, off site. Drainage, courses (swales and ditches) will. be provided with the earth
check dams, where called for, or hay bale/silt fence dams, to minimize sediment transport. [Construction
details for temporary and plerynanendstorrawater and eiosion control devices are,appended to this report.]
All disturbed areas will be seeded as dictated below and dust will be controlled on roadways using water, or
other approved methods,
d Insvections
Initial SiteAssessment:
The operatoru shall have a qualified professionaI2 conduct an assessment of the site prior to construction
activities. The professional shall certify in a report that the appropriate erosion arid sediment controls
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Fairfield Pi-of6sional Mee Subdivisim.1 May 2007
Stornma ter Vollu tion Prevention Plan Revised Sept
3 � L()
described in, the SWRIT and required by Part ILD orf" No. GR-02-01, are installed or jmiplemented,
enstire overall p�rep,axedness rid"[lie site for the. comincnocinent of corlstrucfion
Inspections:
F'ollowing the commencement of COJIsM,Uefion, erosioll Control devices shall be hispected once a weick arnd
Following rairif"all events exceeding one half an inch. A rain giugc will be installed on, ,dte to determine
rainffil,l ainount, which will dictate when the cro,sion ooritral devicP.:s,, are to be inspected. The erosion c(.mltrol
devices Nvi 11 lac clulned and repaired as riecessary to insure Fro per operation.
1`011mving each insI)Qction, the qua.]Mte,d proRssi,onal shall document the fol.10%ving:
On copies of the final approvedsjw, plan, indicate the extent ol'all disIttrbcd sito areas and
ch-ainage piathways. Indicate site areas diat, exl)ected to un&rgo initial, disturbanQe
of-signiflicant site work with the next 14-cWy priod-
2. Indicate on as site pilau all areas of the site that have undergone active site work during
the previous 14 days,
3, Confirm that erosion and sediment controls are located to PrGIOU LOICHStUrbod area."', not
Under active site w(,)rk.
4. Indicate all disturbed site, areas that lla%of, 110t Undergone active site mc�)rk during the
previous l 4 clays.
5. Inspect Lill 3edimenk eontrol practices and tecord the approxiniate degree of Sedinwrit
acctirmilafion as as pementage ofstorage volurric
6. Inspect all erosion and sedirrictit contnA and record all i-naintenalice
rQqtl,iremcnts suohas ver-ifs ing the integrily of dic harrier cm- diversion systeiri aitd,
con tit i rfirrictit. sYstems, ldenLif.Y a1I evidence ot"rill or gully erosionen occurring on slopes and
any loss of stabifiziftg vegetafiOEI Of' SCCCH'1Ig/11lLIJGlliiig., Docuatcrit arty oxoessive
de,position of sedifnefft orP ondirEg miter along bari-ier or diversion w
sysnlis.
Record tine depth of sediment within Qomaintfwmt Mructures, any oro&lun near outlet and
overflow structures, and verify the ability orf rock fiftc�rs arc�,Rind, perfonated riscr pipes to
daanss Water.,
De l�i I fitkol Is],(?I law 21 e Ild 0 f reporl
The Operator shall maintain are necord,, of all inspection reports hl a site lo b
'g ,Lx)k,, whicJ'i will, be inadaifl
c aivable
to permitting aAlthOriLiCS Upion request. I'dor to the co�rn rrie nee ment. of oonstruokm, the operator shall
certify in, the site logbook that 111ie sediment and erosionen control Practices 1-noet the requirernents of"Ille WPPP
as well as applicable Federal., State and local cro,siori and w. dirrient control
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Fairfield Professional Office Subdivision May '2007
Stormwater Pollution Prevention Plan Revised Sept 20,16
The operator shall post at the site, in a publicly accessible location,, a surnmary of the site inspection activities
on a monthly basis.
Prior to filing a "'Notice of'Terrnination7, or the end of the permit term, the operator shall have the qualified,
profession.al perform a final site, inspection. The qualified prof6qsional shall oeitify that the site, has
undergone, final stabilization using either vegetative or structural stabilization methods and that all temporary
erosion and sediment control practices not needed for long,term Wyrrnwater control havebeen rfmoved.
The operator shall certify that the requimments of the SWPPP have been satisfied, within 48 hours of
meeting such requirements.
Maintegangg
During construction, sedimeat shall be rernoved frorn sediment control devices when,ever their capacity has,
been reduced by fifty (50) percent from the design capacity.
All peirnane.nt slormwater control devices shall have any silt removed from, the m, and genierally updated
to their full.function prior to ceasing conStrUction activities on the site. Once construction has been canipleted
on the site,the operator shall inspect the basins on a routine basis., 1f the inspection determines that morethan
25% average of their functional volurne/capacity has been lost due to siltation, damage, etc. the deviQe(s)
shall be cleaned and/or vepaired to their intended function.
toren water conditions represented in this report are based on modeling of the site for both the "pre-
development", and existing,, and "post-developmenf" or predicted future conditions. Stormwater peak flows
are calculated for a 1:, 10, 501, and 10,01 year rainstorm, runoff violumes, are: calculated for a I- year rainstorm.
using "FlydroCAD" Stormwater software which is based on TR-20 methodology.
Stormwater rno&Js should be thought of as reasonabile comparisons of 'before' and 'after" development
condit,ions, under the conditions mod,-,led, not a predictor of actual runoff rates under all conditions. Actual
runoff rates can vary frorn predicted flow rates due to conditions such as rainftll patterns, soil type,
vegetation patterns, and soil rnoisture, conditions, etc. which can be highly variable over bine and
geographic area and run thus depart,ftorn predicted or dooumlented conditions,
Design of the stormwater system is intended to be in compliance with the New or State, Department of
Environmental Protection (NYSDEC) General Permit No. GP-D2-01
The site„ as it exists, consists of open area to, the north and central end of the property and trees and wetlands
to the south end of the property. Test pits were performed by Jarrett-Martin Engineers, PL LC on
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Fairfield Professional Office Subdivision May 2007
Stormwater Pollution Prevention Ph ni Revised Sept 2016
I)QQQmb,Qr 28, 200,6, Eledrock j,", at a depth of 11ucrr,, thorn fimi" fbCt, grOtlndm,yater was at varying depths Crain
10" to 22" with slow �oii. pernicability (soc drawing SPI "Spedt,11cations Notes"),
Stonn-yvater Conditions,
Site runoff„iris been modeled with three drairiage or sub-matersheds, Th Q: first subcatrdunent
k contained; in die northem 2/3 of the property. 'I'lic second svi kadinie tit is in the ;(ninth west corner, and
flie third !3ukatchrnent is contained to the south central a:ixt soutt-wast, portion of the property. The 12
p
acre lot to the south of the building lots as hnot been modeled as thea as n() contdITUCtion lanned for [lie lot.
T'N2; pre-&veloprilent stornv�vater rate For the subcatchmenuc,, has 'been calculated at the following rates and
VOILITRICS (sa, table belomr).
SUB#1 SUB #2 WS #3 TDI'AL
I YFI(RATE) a 16 C17S 0,0,2 CFS O05 CFS 023 CFS
11 YR(VO LU MIE) 0.07 AF 01V AF 002AF 0,.09 AF
10 YR (RAT E) 2.9EI, CrS 0.87 CFS, 1,37 CFS 518 CFS
60,YR (RATE) 6 28 CFS 193 CFS 2,93 CFS 11 14 C'l-'S
I00 YR (RATE) 8,25 CFS 2,54 CFS 3,R4 GF S 1 4.6 3 CI S
rui-Daidua,urad 5Wunualu Quidilkaw UW Miligaligs!
F,,(:D1lo,vving Construction of the propo,sed build,ings, parking arce, and road% the site is proJouted to cantain Four
Wbcatchnwnts- Culudations show that the storrilwaler rumoff volurne and, ralo wdl increascwithout proper
iiiifigation (scc table b,clow).
SUB At-11 SUB#2 SUB#3 SUB#4 TOIAI.
I Yf,"k (RATE) :2 27008, -1.77(',FIci 2.5�),CFS 3-55 CFS 10,-18 C.",F 8
1 YA(VOLUME), 018,AP 0 07,AF 0,11 AF 028 AF 0,64 AF
' C 1:S 7.7�� CFS 1,06 1CF"S -1 GFS
I()�Y R (RAI 17.07 C,FS 4 0
50 Y[,,' 0,160 C,F S 9,q,�" C�:S "I 1541 G F 111 14.96 CF S �iTOG CFS
1130 YR (RAI-E) 12.44 CFS 1-1.76 GFS 13.54 CF-S '17,42 GF,"S 515 16 CIF
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I" i fi ld Professional Office Subdivision May 2007
Stormwater Pollution Prevention Plan Revised Sept 2016
Management
The above sections, showy that stcrmwater runoff volume anus rate leaving the site will iurcteas=e after
development unless provisions are taken to manage stormwater on the ,site. To, reduce stcrrruw ater runoff rates
to conform to,NYSDEC standards and to minimi stormwater impacts, opc.n channels (wet swles) and wet
ponds are pfopesed to capture the storrnwwater from the new impemviI uxs area.
The wet swales act as the pre-treatment (fere bays), for the ponds,ds, hich. are 'to be looted to the south of
the proposed construction. Stormwater will reach the wet swwales frorn both overland flew and through a
catch basin and piping system. Thewet et sw,ales aauml ponds have: designed to,the latestedition of the,New
York State atormwwater Management ement Design Manual.
The attached callcuzlatiens shows that with the storrruwwater rniti ation in place,predicted star muvur ter runoff rate
leaving the site fuer the 100-year storm event will he 14,32 cfs total (see table below). THs is below the
existing rate of'd schar e of 14.63 cfs,
TUBI#11 SUB#2 SUB#3 UB#4 TOTAL
1,q11fE) CFS GM CFS 0,00 CFS
10 y ( .ATE) CF8 0.80 CPS CFS 1.25 CFS 2.08 CFS
5 y' (RAT ECFS 339 US CFS 5.88, CFS 9.27 US
100'YR(RATE), F5.29, CFS CF8 9.03 CFS 14,32, GFS
The pest development calculations, are bell,cww+ the pre-development rates for the 1, 10„ 50 and 100,year
storm events with all mitigation measures installed.
' rxitem° u,�lx�mlit� 'mmlmmmm-re;
For 'Fater Quality Voluurne, the attached worksheet shows 23,325 cubic feet total required, and
'78,000;1cubic feet have been supplied in the ponds. The swvales contain an additional 10,00,0±.
cubic feet Of V lume,
h,suumuuxe) Protection
The site provides for retention cif the 1 year 2,4 hour storm, thereforc the .site design. meets the 24 hour
reetemution rc u.uimemuruent.
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Fairfield Professional Office Subdivisimi May 2007
SUm-nmater Pollution Prevention Plan Revised Sept 2016
11verhank
,111 r site controls the 10 year storm pA-.,.qk discharge.to below the I)l-e-clevelopment rate, therefor(, ate site
Mg meas the Overbank Flood Prowflon criteria,
Extimme Storim
The situ corltrol.s, post-devehrmnent runoff to bdow Me pwArvelopmenit rates for the I 00-yea r stmm
even:° The she design meets the Extrei-ne Storm orkeria.
Con stmi,gtioll
Conmcdon is assumed to begin on or about August MOT See Appendk I I Ir Conmcdon
Sequence Schaduh.
Conti-aeloi-A ekn o P vleelgetitew
The commum listed below AaH be msponsilAQ for all rQquivc�nwnts lkwd above pertaining to Teni.pora.ry
E.".rosion Controll Measures during commahn. (Wiractor nwne, address, alid phone nurnber to pawl filled in at
the fivne ofcontrao being awat-ded)
Name.
r• s-
No,
Ile aboycqvenfionee. contractor and all SUbconLracLor's perhming cal-th work. shall read the C-01"Jondng
statement nnd Qi bdow Whig that they have mad and unders,tand the b(flow cicrdficafion prior to
wIT111mvicing afly Consbaliction acdvhic,-j.
9 car dir under penatq or lamy that I understand aptd agiree to comply with the tet'itis and
conditions of the SW111" for the eousttwtioit site identirwd in this SWIT]" as a condiflon of
authoi-izatioti. to discharge storinivater. I also undersftind that the operator inust comIdy i0h
the terins and condiHons of the fiew York State Pollutant Dischai�ge Efinfinate System
�s frj��Jjj C(,)uq.trUetrj0n 2Ctj:VjtjCS
�SPDES) general per-mit for stornivrater dischitqge and that it is
tudawl."u I for any person to cause or coutHhute to a violation of Water QuaQ Standards"
Page 7
'airfield Professional tl f ubdivis.1 May 21,07
Storinwater, Pollution Prevention Plan Revised Sept 2016
in of 'orntr ctinFirm- Nam
Date.
"Name of antra t*91
Firm: Name:
Date:
.rrie of Cantracting Firm; Name,
Date.•
Signature:
Nai�ne of Contracting Firm; Name
Date-
Signature:
at -i na,turr :
Name of Contracting Firm: Name:
.Date.
Signature.
In add, tion to th above listed requirements, tine c*ntractor sball inake tla rns Ms familiar with requirements
outlined in P rrt`uit No GP-02-01. Special note, shall be taken to mparting requirernents, which are t .
responsibility of the operator listed in this permit.
Plan Prepared by.
JARRE p°Engineers,1"1,L
4!S219-4)4,00,
K. Thomas larrett, RE.
Principal
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