HomeMy WebLinkAboutCorrespondence - 180 MARBLERIDGE ROAD 12/17/2002 IMMER
ENVIRONMENTAL CONSULTING
21 Pine Island Road Newbury, MA 01951 Tel 978-463-9226 Fax 978-463-8716
October 18,2002
Town of North Andover Planning Department
27 Charles Street
North Andover,MA 01845
Re: Watershed Special Permit
180 Marbleridge Road
Property of William J.McDermott
Dear Planning Board
Enclosed please find two sets of mailing labels and stamps for notification to abutters,as requested. Also,
enclosed are ten(10)copies of a revised site plan depicting a revised layout discussed at the Planning
Board's meeting on October 15. This layout,presented on the sketch prepared by K.J. Savoie Architecture,
has been added to the site plan prepared by Clipper City Surveying,Engineering&Mapping,Inc.The
change includes a reduced building footprint to meet the requirements of the Watershed Special Permit.
The building footprint as shown on the original plan submitted was 743 square feet.The revised footprint is
583 square feet representing a 24.8%increase in gross floor area.
We look forward to discussing this project with you at your next public meeting on November 12,2002. In
the meantime,if you should have any questions or require additional information,please contact me at 978-
463-9226.
Very truly,
RIMMER ENVIRONMENTAL CONSULTING
Mary t0 '"
i mer
Principal
E
Cc: Mary Ellen Fennessy McDermott
n(.T 4 2002
NOHS T H ANbbVEA
PLArvMNO Q[�PAMTMC--N
i
Grogg area of proposed addition= 563 5q, ft.
I' � Percentage Increased floor area p 24.8%
(Allowable increase Special permit i5 : 25% )
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Firm Floor Plan
Addition and RenovatJon to the
i aCHITBCTUAE �1 c Permot t Residence sc Id 1/811=1'
180 Marble Ridge Rd,, N. Andover, MA pa 10 Oct. 02
TOTAL P,02
,. IMMER
ENVIRONMENTAL CONSULTING
21 Pine Island Road • Newbury, MA 01951 Tel 978-463-9226 • Fax 978-463-8716
October 11,2002
Planning Department
Town of North Andover
27 Charles Street
North Andover, MA 01845
Re: Request for Amendment—Watershed Special Permit
180 Marbleridge Road
Property of William J. McDermott
Dear Planning Board:
On behalf of William and MaryEllen McDermott, Rimmer Environmental Consulting requests that the
Planning Board consider amending the Special Pennit granted for the above referenced property to allow
for the construction of a 583 square foot addition to an existing single family home within the Watershed
Protection District. We request that this request be addressed at your forthcoming meeting on October 15,
2002.
This site received a Watershed Special Permit in 1994, prior to the construction of the original house. At
that time, drywells were installed to accommodate runoff from the roof and driveway areas. Enclosed is
documentation provided by Milestone Engineering addressing the infiltration of the additional impervious
surfaces created by the addition. We believe that by incorporating these changes,there will be no adverse
impact to the water quality of runoff entering the Lake Cochichewick watershed. The addition will not
exceed 25%of the gross floor area of the existing structure,as required under the Special Permit.
If you should have any questions or require additional information,please feel free to contact me.
Very truly,
RIMMER ENVIRONMENTAL CONSULTINC
7m&j��IM'_----
Mary Rimmer
Wetland Ecologist
52 Washington Street
'< Newburyport, Massachusetts 01950
Voice : (978)462-4171
o N E Fax : (978)499-2117
Civil/Site and Environmental Engineering
Land Development and Permit Acquisition
October 10, 2002
Town of North Andover
Community Development& Services
Planning Department
146 Main Street
North Andover, MA 01845
RE: 180 Marbleridge Road, North Andover, MA
Mary Ellen Fennessy McDermott
Required infiltration sizing for house addition
Dear Board Members:
Assessing compliance under the local Special Permit requirements can proceed via many
pathways. Rather than prove capacity of existing systems to absorb the increase in runoff it was
decided to proposed and design a new"Infiltrator" (or equivalent competitor) subsurface
stormwater trench and storage system. Such a system can be sized for the net change in site
runoff volume during the 100-year, 24-hour storm event incurred by the proposed addition. This
system can also be constructed simply and fairly inexpensively.
I have attached a construction detail and potential layout given the proposed site plan provided
to me by you. Please keep in mind that so long as the construction detail remains unchanged the
only deciding factors will be the approximated rooftop inflow area to be served and the calculated
number of required infiltration units. Thus, changes in layout and footprint can be made in the
future without compromising these calculations so long as the approximated rooftop inflow area
is not exceeded or the calculated number of required units decreased.
I have included a few hundred square feet extra of approximated rooftop inflow area over that
calculated by measuring the proposed addition off the site plan. This extra area should more
than compensate for pavers and other impervious surfaces being proposed in the landscape
about the new addition.
Calculate Required Infiltration Volume
Given an approximated rooftop inflow area= 1,500 square feet
Given a parent hydrologic soil grouping= Group D (determined by inspection of
N.R.C.S. Soils Survey of Essex County Northern Part)
Given an existing Cover Curve Number(CN) = 80 (Lawn, or Open Space, good
condition) (See attached copy of Table 2-2a from the N.R.C.S. TR55 manual for
soil group D)
Given a proposed Cover Curve Number (CN) = 98 (Impervious areas) (See attached
copy of Table 2-2a from the N.R.C.S. TR55 manual for soil group D)
10/10/02 Project CLP0205
Page 2
Using attached Table 2-1 from N.R.C.S. TR55 calculate existing runoff depth for
100-year 24-hour rainfall of 6.5 inches = 4.23 inches
Using attached Table 2-1 from N.R.C.S. TR55 calculate proposed runoff depth for
100-year 24-hour rainfall of 6.5 inches= 6.26 inches
Calculate the increased runoff depth resulting site development: 6.26 inches-
4.23 inches= 2.03 inches
Calculate the increased runoff volume resulting from site development: (1,400
square feet)(2.03 inches)/(12 inches/foot) = 254 cubic feet
Thus, to meet the 100-year rainfall requirement 254 cubic feet of storage must be
provided in proposed trench.
Calculate Provided Storage Volume
Given a trench cross-section of 3.00 feet wide, 2.00 feet high and utilizing 11
infiltrator units at a length of 6.25 feet each, all as detailed on the attached pages.
Calculate the total system volume proposed: (3.00 feet)(2.00 feet)(11 units)(6.25
feet) = 412 cubic feet
Given an infiltrator void volume of 16.3 cubic feet per unit(See attached
manufacturer's sheet)
Calculate the total stone volume proposed: 412 cubic feet- (11 units)(16.3 cubic
feet) = 232 cubic feet
Given an approximated stone void ratio (Vv/Vt) = 0.33
Calculate the total storage volume provided: (11 units)(16.3 cubic feet) + (232
cubic feet)(0.33) = 255 cubic feet
Calculate the total length of trench provided: (11 units)(6.25 feet) = 69 feet
Thus, as designed the proposed infiltrator trench will store the net increase in site
stormwater runoff volume incurred by the proposed house addition.
Given the entire above do not hesitate to contact me should you have questions or comments
regarding this matter.
LtM r .
Very truly yours, �
a .JOHN A
S011CY
u CIVIL y
0.39867
John Jr.,
Principal
Milestone • 52 Washington Street, Newburyport,MA 01950 • Civil/Site and Environmental Engineering
Table 24 >*Rurtoff curve zittnibcrs fot urban areas!
�tarve nunbers for
Cover dac ptl n hti�h is is ii: r a
Average porc#nt.: -
Cover type and hydroIcigic condit'ivh it env ouwa lfk- .:.: A f :. p
lastly clever urban areas !t elation er-R blishvd) PRDPD:9E:b C0tJtATIbt4.
Open space(lawns,parka, golf courses,cemeteries, EX15M O G, CbtJtk[1biJ
Poor condition(grass cover .,....._ .. 19 86 bll
_ _..:��Fair condition �a tover 56% to 75%jt El 7D :.
Good Condition(ws cover.;?. 61 74
InIpez-vious areas:
Paved d panting Intt,?rofs,Chi 3, etc..
(exehading rllghk--of'i ). ... 98 98 919 98
Streets and madsz
PAved;ic-arbs ud storm am4ers(excluding
fight-,f cvay) 98 98 98
Paved:open dit s(including riglit•of-way) ...... & b9- ti
Gravel (xnclucLing relit=o-f y) ,,_.............. . i6 85 � 91
rqrt(ir eludln.g i�ght-of-iv ky) .,....._... .....,...... 72 f=9 ,.. l
"- western desert urbAn areas:
1+7at 1 desert landscaping(perci are-as only)4...
Art vial desert Undscap ng(impervious weed
bwTier, dirt sYrzvb with 1- to 2-inch sand
or gravel tvel inulch and basin borders). ,.e:.,,,.,., ... 99 96 96
Urban,districts
Com.w rcial and business;,,,,,,, & ... . .._. 92 94 95
Itlttrial...... .....- .. 72 81 86 91
Residential districts average lot size:
1!9 acre or lass (to"hoes :......... ........;. 65 €5
)JA41 i7
72' 816
1 ACTT 'LQ 5} $t3 7 . i34
..,.,
......................:..,..,.. . . �� ._.... - -4 65 !i 82
..
t� rtz ttr�6rart ti��
Iti°e+vly graded areas(pervim nr only. . : -
no VRgetation}� ........... 77 86
Idle lands(CN s are' determinq* Using 0DVeF types
sinter to theme in
table 2 ?:..
lAverage raaaf 06dit-,And-1 04a. .... .. .
Me t;#etag#perCettc inpei-it)U area STIOX 71 Wrw k4,ed to tievelop the compoite<a S Qther 3�.t.ionm:tae u:feliu4x�; trntser+3+�us zit*mt
VA*itlreedy cotitit.ud v)the drAinage vWem,impervious arew4 hs►qV a:.** .aYt�#_p�t�i� utk�kr ieui2lerEtl etiiiiaalu rt[�H}��r'
spate in ntr��hvciroi-39 se tlQn l":t pro,kr���,i�t»tr�tt��oaf inditona t* Vpt vte_ci u;?iM gure
'N' liun are t�tlt tti itreiimp 'G't's sn:ty tte ttftiyputec#1Vr cater entitititttitt�i�+ft+*npaesvtr: e,
'G4i�pr�>ite CN';tr�r t+aisarai titn�rt istnri Capin shcttai(i be computed a:Ang Ikj� u 2-13 tw Y-4 based on-1 imp. �� pe�e�t ti�'t(:.,y
)anti ttte W-ryit)w areu C,iN_The perviougs area CN'y._are ur d_sw;uir;tlent t±t Cie tt t{hY ti iii pout #!ti#iii
l;urtijwlte C VL ',to we Aw the&Wgn of tempom i. cne rAvre�tiu�inkgiuu3ie �1W�ei�ittrttctki6�fi+�ii)tl be��t�t} 6�ci u;it�k
bRwd on the flegw of deyeh)pm-91t limpervitputt urea pereent )anti the CN s(tw the nv lv graded peryinIM xreag.
4
texture is gives in appendix A for determining the Hydrologic condition
HSG classification for disturbed s-oils.
Hydrolo*:vowdition indicates the of lets of cover
tV, .,e.. a nt.: ri infiltrations and runoff and is
f;t�vor type generally astunated from density of plant and residue
cover can rrliple areas. Good hydrologic condition
Table 2,2 addresses most cover types, sueb as indicate* dial the sail usually has a low runoff
vegetation, bare soil, and impervious-surfaces. There potential for that-specific hydrologic sail group, cover
are a number of nmethoda for determining cover type. t�rpef:ar�d W-AA,h,.,&tie factors to conalder in
The woA common are field reconnaissance, aerie e ti `tie et2-ect.:of ever �srt tit do� anti
photographs, and land use maps, runoff )canopy or density of lawns, crow, or
other vegeta-tive areas; (b) mount of year-round
cover,,(-am-aunt of grass or close-seeded teguines in
Treatment rotationap(d)percent of residue cover, and(e}degree
of s u rface roughness.
Treatment is a cover type modifier (wed only I+.�'��CL\°�tl�-IV
table 2.2b)to describe the management of cultivated Cof'1n\-C\t>0 = �,2�j I KIC�I
agricultural lands. It includes mechanical practices;
such as contouring; and terming,and management ..:.:.. ►f�CTe�22��-[FD �'OS�
practices, such crop rotations and.reduced ed or no CD�h��- (W
tillage,
7'ah)e 2-I.-Runoff depth for selected N's and ra nfall mnountei
Runoff dept foF cave nut
Rainfall 110 45 55 60 65: 70.-_... . .5 80
1.0 0190 0.t}{? 0, O.tf►� 0_p0 O.i 1 000 AM: O.U13: 9.17 t1.32 G.S i �ffi� w
__
1:? ,00 . ,. 00`.. .:: .E)p _€}0....._....._. ,137 j76 2 ,R W
L4 .90 104 .00 '00 . A .112 _13 24 1$9 .fag ..1 .` 1.18
1.6 0E1 qp: ..... .: OI .84 .n .76 1.11.. 1. .
1.
100 <: 00 4Q 414 AA:
2{1 .0D M .OD 0� .06 .14 4 s38 56 .8p
2.5 €
00 t12 .17 .30 Z9* 1.18 1.53 1.9ts..
.2"t
3-11 (1`> ( 19 3.9 1 71 .96 .126 1.59 1.913 Z4 6
, 120 25 .63 .75 1101 1.30 1.64 2 2.45 U.4 3,2 t
4.0 A .18 AM : .:: :Aq .76 1,03 L4 ,1,47= 2,04 2.46 2-92 . 3,43. .:.. 3.t i
4.: ,14
-5-4. -74 7:4 1:67 2: 2�3f 2.91 3.4-0 3.9 4.26 BA .24
.44 169 1E8 1,30 1,�r... ..._._�,_ 2.45..._.......Z"M 437 $:fSB.. .. 4:42.. .....4:s6--
6A .50 .1311 114 L52 1.92 US- 2,81 3,2€8 3.78 4,30 9.85 5.a1: 5.76,
10 M 114 1�$. -.212... .�1i41 ��Q....:...:_��# 4.15 4,69 5 i 5.82 fa_��` 6,7-
8.0 1-25 1.14 2L25 2.78 9.33 3:89 4 4 ....; :., ,..._ li; 621 .. 681....::...7 4€i 7.7€i
9.0 1,71 2,29 2.88 3.49 4.10 4.72 SA 5.95. 6.67 7.18 7.719, -A 4€1 R,76
10.0 2.23 Z89 3.56 4.23 4.90 5.56 ....::: .._:.:.688. ......7.52 8.16 8318 9.40 9.76
11.0 2.78 182 426 5.00 5,72 6.48 7.13:.. .... 7.81 8.48 9.13 9.77 10.39 10.761
12,11 3.34 419 U0 a79 6.56 7. :65::.:..;8 76 9,45 10.11 10.76 1139 11,76
1310 4110 4.89 5.76 f,61 142 8.21'::_:;....$:98 :...,:9;71. .. 16,42 11.10 . 11. 6 12139 12.76
19.0 4.65 6,62 6.55 7.44 8134 9.12 9,91 10=91 11.39 12.08 1 .45 _13.39.`..,33.76......_..:.:._..:..:,,.-.-._.
1510 5,.33 6130 7.36 13,29 9.19 1004 111,85 11:6a 19.37 13.67 13.74 13:39 M76
'Interpolate the vat=W shown Z ainAl rUMff tlepthb for CN's or rainfAn aifloonts not shown.
(210•VITR-55,fond Ed., June 1986) �,8
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