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Home My WebLink About1985-08-06 Engineer Review LEA GROUP E C'aI EEIZS.'jMZ(:HITEC:T,'�I]'L;%-NNEI] S lay 15, 1985 North Andover Conservation Cumm ssivn Town hall North Andover, :la8sachu6cttr, Gentlemen. The existing building portion of the WOK property on Salem Turnpike consists of 3.227 acres of land . Of this acreage, this area is covered by a roofed building area of 0.1.2 acres, a paved area of 0.57 and relatively natural area of 1.. 537 acres. The proposed construction of this building and W required parking will change that to roofed building area of 0.28 acres a paved area of. 1.02 acres and a cori{xination of landscape grar:sed, acid retention areas of 0.927. Using the rational formula and a 100 year rainfall of 1.85 inches in one hour, we would anticipate that the existing conditions would produce a runoff of; - Ai0 l = 0.12 X 1.85 % 1 W 0.22 Us 2 = 0.57 X 1.85 X 0.9 = 0.95 Us 3 Q m 1.537 X 1.85 x 0.5 = 1.42 Existing run-oft' 2.59 e s The proposed construction would increase the runoff to the wetland area as follows; Q2 = Az C 1 Q = 0.28 X 1.85 X 1.0 D.52 Ns = 1 .02 X 1.85 X 0.9 = 1.70 Ks 3 Q2" 0.927 X 1.95 X 0.6 = 1.03 cfs Total Proposed Run—Gff. = 3.2.5 cfs This represents a 25 increase but is still of minimal effect on the total wetlands area. Very truly }ours, LEA GROUP 9 1 a L. Lima, F.F. DLL:ngw ,�t�ilc'a•I,ailct�lr�'4'l.]i�r.1�sii,kk:�4�r4'I Il'-xc'}},dl„��I TVIL'�)Ilc MV 1 17I .J 2i,-631 If Fugme R.Uambeq L4Wr ROOM AF.&n h Pwl D.(iueRlh .tansy fi. 11 7 wfa F516mley E.l�y�Ykein Maur E.N.Brig DoaiF4 M.Sriojs Konaelh W. Chg n Mirhael A.rwusa}' €U;ard F.C.akjAy.if. LdaHYSW#fl 292.2 "i.1 .cl Parser Li enthal Eisenberg Anders, Inc. Engineers C411iF li.FL�k7 14'iE k 5 n.relel titan![.Steil} 75 Kneelond Street, Boston, Massachusetts 02111 r (617)426.6300 Zahn F.KreF id. NC*r B Xn.v Won Mlulto L LWDn MtMn J.La 6& CEeeq A MicW.her Mintey A WhimK Amhitd X.Mcliuil4q b■+nd A-"Co c4rlfe L. RLQr William] XioRmond NO 502lerkO Alwq L STnaun Mr D.Thiagd4u Fred N 'Fibbv Arthur J.Tarns Paur b.weanrn May 2 , 1985 North Andover Conservation Commission Town Hall North Anduver, Massachusetts 01845 Re: LEA Project No, 85158 Stone Company Gentlemen; In my letter cf May 15, 1985 I raported that tie run--off from tha WOK property on Salem Turnpike would increase by 0.66 cubic feet per second on completion of development. This was based on full 8eveloptuent and a ICO year 1 hoar rainfall of 1.85 inches. I also reported that we planned to fill in 2,140 square feet of wetlands. I have computed the volume of earth that will be required to Bill this 1n between elevations 233.5 and 234.75 feet as 1,070 cubic feet. I have also computed the amount of earth that will be removed to provide the 3.100 square feet of new retention. tletwee3I elevations 233.0 and 234-75 feet 7,300 cubic feet will be removed. This will give a net increase of storage on the southwest side- of the Salem Turnpike of 5,230 cubic feet. During the peak one hour rainfall during a 100 year storm, 0.66 cubic feet per second x 60 seconds x 60 minutes equals 2,376 cubic feet to be added to the wetlands on the southwest side of Route 114. This still leaves a net increase of 2,854 cubic feet of storage. _ Notth Andover Colas ervatlon Unenthal Eisenberg Anderson Inc. commission , May 22, 1985 nci$e�xtl , the as of the Natal wetlands extendin into Andover outlined 4 L y i� in red an the attached pYsa s rim-offwere tt�at) is 15,200,000 un into the wetlands uncompenBated, cubic feet of additional 7G divided by 7 it would raise the water level during a ADO year atom, � 15, OO,ODO equals 0.00D15 feet, or 1J2000ths of an eh) . i Very tru1-y yours, LIVENTHAL 'EIS"BER ANDERSON' INC' } I Dou L. Liston I Chief Site Engineer DLL.-Peg r Attachment. GROUP ENGINEERYARCHi7EC TS-PLANNERS may 28, 1985 Nortb Andover Conservation Commission Town Hall North Andover, Massachusetts 01845 Gentlemen; As shown on the accompanying red outlined prints, the following areas will drain into the new retentiDn basin, rather than into the wetlands as it Presently doss. Q � AiCF 1. hoof, Q e 0.16 x 1.85 x 1.0 0.30 r-€s 2. Pavement, Q = 0.33 x 1 .85 x 0, 9 0.55 cfs 3. Grass Area, Q = 0.27 x 1.85 x 0.6 0.30 cfs total run--oft into Retention Basin 1. 15 cfs Total Developed rein-off 3.25 cfs 3.25 -- 1. 15 a 2. 10 cfs to wetlands Net decrease from existing run-off into wetlands equals 2.59 cfs 2. 10 ifs s 0.49 of s Very truly yours, LEA GROUP f►oug as L. piston Chief Site Engineer DL'L.peg Enclosuring `�fv3ct•l:Errc3 S[rrc'E,3�,skL+n_1i:tw�,it�i4t:�[s:0?3�� J? ve/Of James a.JumW W L MMtd L�F Maw M.06 Kemnelh W.Cadimm Mkhid A.C mammy p4med K O"d,h, ne mWel Fmw Unthal Eisenberg Anderson, Inc, Engineers on 1=00fivy 75 KneelandStreet, Boston, Massach sett s02'111 (617) 426-6300, Muk Kay JaM mm..xing"IT, NM L Km=n(n & Rkhth K.Ma%&m MW A.Few i WmW L Wm%g AMM K SWMAM mmm 0.U&MMU Fmd N.,TiEbo As J.Tu%n# sk a Wolor nd U WA n, July 11, 1985 Chairman. North Andover Planning Board Own Hall North Andover, MA 01845 Gentlemen: In cooperation with Mr. George A. Robb, Senior Vice President of Carlson' Commorcial, I have studied the strip shopping malls at: Miller's Corner, Marblehead, Massachusetts The Atrium, Danvers, Missachusetts, Fore,ster's Corner, Salcm, Massachusetts US Plaza, Beverly, Massachusetts Vtannin Square., Salem, Massaclitisetts Although the sizes vary, the characteristics are shnilar to the propbsid shopping: mall Win Andover Street in North Andover., Based on the abovc, we would estimate that the trip generation. would be as follows: 4 specialty stores (each) 4 cars/hr (approximately 1800 s.f. each) Restaurant 75 seats ' 2 to at lunch with 1 .5 pernon/ear 100 cars 11:30 AM through 2:30 PM Bank 7 cars/hr daily Monday through Friday Thursday and fti,day avenlag and Saturday morning - major drive-in window traffic with queueing of up to to cars at each drive up window 2 IVVol TLANNIN BOAR ' f LINENTHAL EISEMBERC ANDERSON, INC. - 2 - North Andover Planning Board July 11 , 1985, During these periods, parking requirements would increase to 15 to 20 cars per hour. It is anticipate4 that the center will have 20 employees and these employees will use 14 of the 73 available spaces full time., At any given hour, with the exception of the bank teller window traffic, the maximum number of trips would be: Specialty Stores, 16 cars Restaurants 50 cars Bank, 7 cars in and out trips per hour 73 cars The number 73 would appear to be in conflict, but in fact, the average stay of the 23 cars will be approximately 15 minutes and the lot will, therefore, be able to accommodate the 14 employee cars parked full time. 73 trips in and out of the site will most certainly not oveTload Andover Street or Willow Street and it must be remenbered that a gpud portion of this trip, generation (approximately one third) will come from auto traffic already on Andover Street, making specific stops for the bank, shops, or restaurant. Conversely, the teller window peak traffic will be "off-peakY for the specialty stores and the restaurant and all queued traffic will be contained on site, It would appear, therefore, that there will be a slight increase in Andover Street traffic, but with the entrance location, and acceleration and deceleration lanes provided, this slight increase will not impact the existing road conditions,, Very truly yours, LINENTHAL EI'4ENBERG ANDERSON, INC., Daugln L. Uston Chief Site Engineer DLL;:peg