HomeMy WebLinkAbout2010-12-14 Stormwater Review Egglestan, Ermir,onrriental
November 23, 20,10
North Andover, Planning Board
1 00 Osgood Street,
M-m-th Ai!,idover, MA 01845
Attir. Judy Tymon, Town Planner
RE: Storinwat,er Management Review
Sutton H11 I Center, 180 1 Turnpike St.
Dew. M s. 'Fymon and Board Members-
I am writing, this letter in follom-Ul) tO MY NOVen-ibet 4, 2,010 review letter on tile above-,
refdenzed project. Since that time I have received and reviewed the October 29, 2040
Notice oftntent (Ni' 1.) and revised site plans prepared by Land Planning, Inc, for the
above-referenced pro'ject, It is my underslanding that the project is currently under review
by the Conservation Corntni."ion, lherefi)re I have geared my comments to their review
as Well.
The revised submission satisf"adory addresse-s most of the issues identified hi Illy
November 0' letter with respect to the drainage dedgm The prop owd substirface
infiltration system shown oral the revised .Plans has been expanded froin, 756, sl'to 1046 '..S.
and the drainage calclulatiOns demonstrate that there will be no increase in either [lie rate
or volunle of runoff discharged from the site or to the onsile isollated vegetated wetlaand®
'.['here should, therefore, be no, delicterimis imPact on the hydtolic�),gy of that wetland.
Erosion & sediment control notes and an O&M plan were also included in tile revised
submitfaL My co,rnrnents are ass follows-.
I. Short-terin, construction retated, activities should be removed f!'0111 (hie O&M Iflan
and included with the Frusloli, & Sediniient Control. notes. The Long Term
Pollution Prevention/O&M Plan should be -Integrated w.111h the one for the entire
site, and the niaintenance tasks coordinated, As, suggested in my prem"Ous letler,
the Board should also ensure that the existing drainage system on tile proJect site
has been and will confintie to ire adequately maintained,
2, Thme Proposed erosion collti-o l! barrier should, be comprised of a siltation fence
togeth,er with the line of haybales for added p n.rotectio
3. All stormwater structures should be inspectied and cleaned as necessary at (lie
ciotrip let kl)n of constructi,0111,
4. The O&M plan calls, for cleaning of tile Storinceptor unit on -m as-needed. basis
(and does not indicate how this is to be determined). I rccotnnietld that the urift be
cleaned at least once yearly, in conjunction with othe s f,�I r .tru tures on the pmpeily.
5 i 04�1 Coach IRo,nmaoA Skg,JJ,)U1ry MA 01776 tel 508.259A 137 N.Ix 866.82018210
IFrt(III 1 {.'w.fit c'i'. -t-c'c1111iL.tli Ri.vi(,%I.
The plan should also indicate that a factor unit will be needed to ukan the
Stol-Inceplol'.
5. The O&M plait calls for periodic raking ol` (he infil#f ation basipi; the, proposed
system will lie suhmn-face and eannot be cleaned by raking.
6_ The, o)rth Andover Wetlands Protection regulations regtfire, the analysis OF the I-
i' design stuff-m, in addition to the larger stomas modeled_ {iml drat the prOp41svd
infiltration systein will Noe 74ro discharge dtinlig tlic larger -yr storm, 1 believe
that the Conservation Commission can waive This recluireanent,
Once again, l a pi'eciate the opporwnity to assist the North A Over Flamdug Board wit#
the review of this project; and hope, Ihat this information is suitable for yoiv needs. PIease
#eel free to contact me if you or (tic applicants have any clues€iow3 regarding thte issues
addressed herein-
incere'ly,
Ec,a<ur--s'roN ENV IRONMI'IN rAL
Lisa _ Fgg stmi, P.F.
C- Jennifer Hughes, North Andover Con sco-witiori Commissicn