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2000-02-24 Engineer Review
12/23/1999 11:, l FL. 7U 982 5490 COLER&COLANTON10 � µ CLE COLANTONIOZ 17-NfaItJFFrgG A"O 50ENrrkGTS DeceBabe,r 23, 1999 Heidi Gliffin RlanrAng Board 1 School Street Noith Andover,MA 01915 RE: Supplemental Engineering, ,Review Lot 9 Willow Street lroposod Office Subdivision Dear Ms_ Griffin: In response to your request, Cofer& t✓blanionio, Inc. has reviewed ate, revi5�d submittal pai�-ka e for the above r8fexozced site, The project has Ern reviewed for confcrrnance to the regairer uts of the " aping By-Law for Site Pfau Review and Special Permit" in North Andover as well as vandard enginwring practice_ The submittal package included o folliDwing information. Plans Entitled: * "Proposed Site Development, Wifiew Street,North Andover"location described a5 Map 98D-Lot 52 consisting of tau sh=is dates 10115199, 7evis4�rl 1 Ib199,Prepared by MUP Design ConsWtants, Inc. Reports Entitled * "Storm water Managcmeut RI-,Part for Proposed Office Bttildirig Frgjcct, Willow Street, North Andover.l IV', dated 10114199, revised 12199, Prepared by MOBF Design Consultants,Inc, * Response letter dated December 8, 1999, * lJetter elated May 12, 1997 regarding wetland resource was @ gxopoFed Stop & Shop issucd by nchacl D_ Howard, Conservation Administrator to North ,kndover Planning Board,Mr. Wiffiam Scott,Director CD&S Ip Submittal letter dated 10l15/99 containing Applioatinn for Site Plan Review, abutters list and trip g"eration comparison. The sire is located within}the North Andover Busancss Park_ Mote specifically it is located on sQutbwcst side of Willow Street, identified by the Town AsSessor's Maps as I.ot 52 orm Map 98D. The proposed site is curretitty un&velo}ed and contains 101 Accord Park Drive 781-982-5400 Nurwelk, MA 02061-i89S Fax,781-982-5490 12�23r1999 11,32 FAX 781 982 $490 mM„ Q�.tR O[,,1A"TDTI0 fa 1)03 2g}povximatcly-2 acres, The proposed €lnvelopment inclades a '?-story office-building Wjth a gross floor area Qf 7,344 s€, and associated drive�v*Paf ling arcs. landscaping,ligbIin9, utilities and drainage facilities. olP-r&. Coiantonio,Intc- has input the given data into a hydre+legy MGM to COnfirM the results- This work was conducted due to the,lacks of inPltlt data for the submitted h dio€ogy mridei_ See Drainage Comments below for outsianding issuns- We offer the following cornmcnts: ZONING BYLAW I. Se,ctiotj .1} It is 1,juclear if any new signs gave been pmposed. Reportedly no sighs are proposed for the site. - Section 7.1)-X It is u cloar if the properly is subject to the Contiguous Buildable Area (CB A)criteria- 'The by-)aw states it leasI seventy five(75)percent of the mi-nimuin lot area regiised for zoning shall be contj guous land otN f than kind located within a Iine ielettiiliml ds wetland rmou.rcc aromas in accordnncc with the Wetlands Protection Bylaw. RepoirtMly this property is not suhlect to the CDA criteria. 3. Saction 7,3) It is our understanding a variance,was granted from the required 50' front setback. The proposed setba&is 20'. No further cnrmaent 4- Section 7.6) The Required Lot section of the Application for Site Flan mview sitnnId hs modified- The F€oar Area patio should read 0.50=I- It r, Uenfly reads 50'- The Application for Site Plan Review has not been modified. 5 Section 8.3)5,)c. The plans are not signed by the Rrofessional Engineer- atisfactorily addressed. b. Sectiim 8,3)5.)e. }v_ No legal encumbrances as they may Wate to the sites physical deve€opnient have been listed. Reportedly no legal encumbrances exist. 2 12/23/1990 11:32 VAX 781 982 5490 COLER&COLANTONIO 7- Section S.3)5.)e.)v-) xhe p,ropo�ed'238 cont0i ur on the we51 sidt of the detlmtion basin has been drawn incorrectly. The grade should be shown as a closed Idol , The 238 contour should be shown as a berm along the top of the detention basin. The em@rgertcY spillway is located at the Highest elevaflon of the pond's berm. It appears that overtlew frorn the 100-year storm r ev.236-91) wiLL over top the pond on the southern side of the}pond in the area of the 236 contour and not through the owlet structure. Additional spot grades are regWred ill this area. S. Section 8.3}S, e_ �i. It is unclear if signs aro proposed for the site- No information has been submitted for review. epuetly no signs are proposed. . Section S-3)5.)e-)viQ STOMKWATER DRAINAGE See drutnage commelits below. J0. Section 9,3)5_ e,)ix,) Exwrxor building etevaiions have not been submitted with this review package, Exterior bui?di tig elevations have bp.an nihmi tied, 11 Section 8, )5.)e:. xi, Tht wctlasid line,is Shawn on the plan. WrAlarld flag numbers should be labeled on the plans. A Notice of Imeni Application should be filed in conjtmctiotr with this application. It should also be noted that Mosquito Brook is a river ftum area as shown on the,Forth Andover Wetlands Reguladons R.i veTfront Area Maps (Haute. I. of 3). It appears that the site.maybe subject to The Divers Act. This may hava,a significant impact on rho site design. Wedand flags have been labeled. R is our un4e rstnndl.ng the IC I has been sub"tted. 11 Section 8-3)S.)e-)xii-) Tt is unclear if a sigh is proposed for the size. If a sign is propmi�d, cho location should be shown on the plans with sign dimensions. Reportedly no signs are proposed. 13- Section 8.3}5.)e.)xiii.)Distances to all the newest roadways andlor curb cats shall b� shown for bDth sides of any street which is adjacent to fhe site. This issue has been sa#ls&rleril addressed. 12/23/10$9 11:32 FAX 781 982 5490 OLER&Cl}1.A TON10 o05 14_ Scc#ion 23)5.)e.)xiv_)It is unclear i f outdoor storageldispiky areas are proposed. If these areas are proposed,they &hould be sho kxn on the plarls. Outdoor storageldisplay areas are not Preposr~ . 15_ Section . )5,}o_)xvi.)The location and detail of itfuse areas should be shown orr the plans_ All refuse areas niusl be fully enclosed. SatiAactoxlly add rosscd. 16. Section 8.3)5,}O,)xvit,) The hghiing fixtures have been sWwix diLd &tajled, The proposed illurnination diirction and degree of iltumination have not been Shown. This comment bas been satisfactorily addressed, 17. Sept}on 8 3)5 Drainage Basin Study See drainage comments below 18, Soczion 83 .}e_}xix,)A tra.f&ii r>tudy may b:. required by the Planning Board. It is our unjerstandi n g the PlanniAg Board will review tyre trip generation information submitted with the revised plans. 19, Section S.3)5,)(-,.)x .i.}A chimney connec!Eion detail should be added to die detail .lheers for the severer connection into the exis[in 8" sewer main iri Willow Street_ The invM labeled for the sewer invert appears to he prior to the chi rnmy c:ouuer,dQn, -ibis should be claiitied, This comment has been sj%tlsfar-torily ilddr essed. 20. Section 3)J,)e)xxii.) A fiscAl impact Study may be requested by the Planning Board. Reportedly this waiver has been granted. 21. Section 8.3}5.)e),xxii]) A community impact study may be requested by the laming Board_ Reportedly this waiver has bten grated. 22, Section 8. Tlie grading, drainage and erosion conuol plan should shove the location of erosion control mc-asuras and a dezriplion of those rr�easur�s. 4 1: i9S9 i2; FAIL 781 SU V490 COLER&C4i.,1NTON10 Q006 ,riliis colExFruelYt has been satisfactorily add re serf. Dnainaae D7i2ri1MS The exis[irrg site appears to be within a FEMA Flood Zone A, On past revieW5 inclvdina the Step & Shop and 740 Turnpike, the I00 year flood'Aevativn at the south side of Turnpike Street was determined to he 0evauon 23 8 based on heal observation�. Thy Stop &Shup project is heated downstx-eam across Willow Street from this site and 740 Turnpike Street#s downstream across Turnpfke Street from Stop & Shcp. Typically as one goes upstrearn, the flood elevation incFeases, The applicant has subrrutted additional iufo3rmation an the flood etevatlokr for the Stop & Sinop pro*t. 'lie accepted flood elevation is 236.74 at Turupike Street. The flood elevation uU&zed in the Stop & Sinop pro,} was based on observed flood levels from the October 1996 storm and surveyed elevations along Turnpike Street at the calvert. We recommend sisrtfiar information,if available,be utilized for this site. Alternatively the applicant eauld include thin nutlet structure in the pre-development hydr0agy mcdet to determine the 100 year flood elevation at this point. It is likely that U5 5lruclitre is restrktive And flood elevations exceed the elevation at Turnpike Street. An outlet structure exists on the south side of Willow Street. The outlet structure consists of a 151, pipe at elevation 233,72. An overflow weir is at elevationk 237.17. Thy 1 -year flood elevation an-site is likely above eleva#kan 23 8, Rased on this elevation the flood water tom Mosquito-Brook may result in backwater impact3 into the detention basin causing possible flood problems on and off sdtr'. Cmpensa€ory£lvod storage may be requii-ed to implement the plait, This issue should lie addressed, It is unclear from the data supplied that this was addressed. Our indepeudent check indicates similar results to CIF with inclusion of tadlwater. The Drainage ealcalations use the outlet waclnre, adjacent to'vVillow Street as a design point in the hydiologiv model. The &ainage areas should be modified to reflect the, existing topography and not be limited by the proper line. The model has been modified to reflect this design point. It is unclear how the existing condition curve nambers were established_ Based upon our site visit,the woods appear rn have. a cover described as good. The woods =mostly iocaied within the wetlands and the curve number documented in an)ej)drrrents ro Ttt-55 is 78 for wood%vetlan&- The brush is de, rib,,d as fair 5 1Y �3•`19 9 11.3-� FA_l 781 982 'a,4S 0007 condition jand loca€ecl in wetlands i11 the,calculations. The biU5,h Wws to be in lair Concliti�Ar, iJowcV(x,this area is ivpland. 1118 exi-S6n9 cunditiOr' calculations Aonid be revised to refiert the correct st-ve ni)ynbers. The cti ve nwnber ctes ribit�g the brush/ wetland cover type for proposed co0idons is 48. The cuyve' nurnbeu for a similar cover type for existing onditians is iste as 70. The proposed conditiosis ctirve number should be--modified consistent with existing condiilons for unaltered areas. The cover description for post-development c:QjIditxotis sLibeatchment area 4 should be 74. The-wooded wetland curve number and brush curve numbkx should he modififd as described above.. '1'he Time.of Concentration calr,'Wation for ext!iting cc lk liGons does not appear reflect field conditions. The flow path shower on the Fre-Development I-1,ydrology pl= appears to be longer than 450 feet_ The existing ditch shooed also be included in the Time of oncentratiOlL calculations. The revised true of concentration does not appear to reflect the ground cutttlitians for the new areas. The caleulationEs Include sheet flow and shallow concentrated flow. Mosquito Brook contains a defined chantwl alad SIOPC and should be included in the talenlatious. The hydirology me&-1 appears to rouLp snbcatchment arrea 5 into the detention basin, Based upon the post-Develaprnent XydTology Plan, sobeatcl=nt.5 does not appea.�r(> flow into the detention basin. The n;odel is difficult.to follow. It is unclear that the comment has been incorporated into the design. The routing diagram is anclenr and appears to route a portion of subcatchment area 5 to pond 7 through combined nodes numbers 5 and G. Also back-up IaformsUon wad ktpat data for the made) should be submitted for review. Information included with the re nt indaadcd sunkmary infor=t€on only. The roof drain pipe appears to have appxaxirnawly .S feet of cover. Documentatiun should be 5ubmiued on ttie pipe to assuxe the pipe has adequate strength for this depth of cover_ This pipe n ay bc,subject to frost heaves in the pal-king lot and be. a long ze, nm maintenance concern, The pipe material has been modified. The,pipe is h�Wcd as ductilc irvt. This comment has been satisfactorily addressed. The Siormwater Management Report states the B 's wi It remove appi'J:W mately 80% of die TSS, it is w1clear how this is deterrnincd. The, applicable,TS S removal spreadsheet should be submitted, The report Mates the sediment forebaY design is included in Appendix lr_ This information has not been included, The 12i2 ,'1909 llz�i FAX 781-9-UL-UMAL COL£R& OLAYMNIQ pOB sediment forvbay should be designed irn -tvith the DEP SLormrvatc�r i4iartag,,Merrt PoficY- A removal of fte1tilty of 80 9r0 was assumed for the wQt portd. The design removal rate stated in the Storm%eater Management Policy is 71)%. ThIs removal rate is based upon designing the wet pond its accDrdance with the strict design criteria described In the Policy. Two eoreeerns include the lack of a sediment Forebay and the potential fluct„ation of groundwater wMeh ,nay result in the pond drying out in the stammer. It iF, unclear if the detcmion basin has the required water quality volurnt� bcluty the Inver.our. The YegWyed water quality vol time acid the volume provided should be submitted. 'fills comment has been satisfactorily addressed. it app"rs that the invert in the headwall and associated Pipe can be raised. The invert into the outlet .51 ructivrc should match the outlet control lriv"t of 234.5. Based on test pit number 3, mottling occrirs at approximately 40" below the surf=. The statface elevation is appi:oxiniately 237.5. Thee elevation of high waver is approximately 234.2. The 4 stajmatvd high ground water labeled On the p ins is 233.57, Doc mrmtation supporting the 233.67 water elevation shartld be submitted If the groxind water is higher than that labeled, the water quality volume within the detention pond may be affected, The water elevation has been modified on the 14a ns,however,storage volume within the wet pntid below the invert out(234.5) has been included 1n the calculations, Storage below the 234.5 elevation should not be included in the calculations. The invert into the d6ientian basin appears to be low aDd i5 =tualjy below the invert elevation out of the detention basis, This wi11 cause a back water aFfeci on Or,drainage plpc- Tipe invert has been raised to elevation 23C5. Calculations for the proposed 15" outlet pipe and IS" drain pipe on Willow Str, o should be wbmiacd. It is unnlem if the,pipes have adequate capacity for tho 100 - year storm eveapt- 7ba calculations should include flows apgr-adient of the proposed manhole. ' adwzter impacts should also be included in the calculations. it is unclear from the submission that tailwater impacts have been evaluated. The 1E00 year flood elevation is 236.74. The invert at the outlet structure is 234.27. Our cheep indicates that Wlwater may cause water to overbore the 7 12/23/1999 11:34 FA-1 781 982 5190 COLER&COLAN'TONIO Roos basin in the southern area (coxttour 236) of the wet pond. he bean shonid be raised or additional spot grades should be shown In Ilds area. A n,-,w manhole,is proposed for The Wj I low Smet drainage system_ Tht pipe invens should be m ilied such that pipe,crowns mat(,-h. This comment has been satisfactorily addressed. The sta pfstorageldtscharge table should be rnodificd_ The volume of storage below the esTimat�d water elevation Fhoufd be pro artd the impact of adjw=t flood ieve,)s shoi,11d be,considered fVr the stQnR-> modcicd, This comment has not beers addressed. There does trot appear to be sufficient freeboard within the wet pang during the 100 year storm event. Typically 11 should be provided. Additional COMMeM8 The sediment control fence detail should indu&baybales as describers to the Stormwater Mztn xgemmt report_ This corment has been satisfactorily addressed. It is ur ckw-where the ondotdrair3 as locaTed. 'Tbem is a detail of the underdrain bus it is not shown on the plans, It is oar understanding there are no underdrains for this project. The propos d building i� adjacent io the daention basin. The fouTidation wail appears to be a retaining wall for the basin. A}orders of the wall appears to be submerged based on The approximate.water eievatiora_ This design shot]id be reviewed by the hLtilding 09pectot This comment should be addressed. 8 12/V/1999 11= 34 PAX 761 982 5490 COLFR&CO ANTONIO � halo Wt :Ipprec a[e the Oppor€unity i0 assisL the Planning Board on this pTOject and 11OPe tElaL this information is SkIfficieW fQT your nizcds_ We would pleased to M'U wilh the Beard or she design engineer to discuss this project U Yovr€O nvenio;ice. If you have any questions please dO nOt hesitate tO Contact US. very Eerily yours, GLER & COT.,-N1TO IO, fNC. Sohn C, tiessia, P,E_ Cc. 3Maric S. Gross. P.E_ Jim Ra-nd Ui a �'MV 1i —i i;i_i ,'Yi JQ— rYam'-' LVLf.a1 4VF.�,'s i•.*Lv �` 4v� L CLANTON1 ' EfV GIh2EER5.ENO VC=[Er M575 January 27, 2000 Held Ofiff n l'larming Boud 15 School tt,�et North Andover, MA 01845 RE: F411cerinu Raviaw CT Loi 9 Wfllow Street Proposed Office Subdivision bear Ivls_ G.iftira; Coler & Co)!,int mil o, Inc_ Etas xec,6vcd supplemental infoai-aation on Jiaiu�uy 25, 2000 fof the above relerenced ptoj"t, The submittal included revised plans and addilkcal hydrology calculations to determine the, flood elevation. A complete respQr e- to the supplemental i.ftorination wi11 be fboheo mIng_ The plans have been revised and 0Ll7 commen[s have been 95% nddiessed. The revised calculations indicate a(load 'Aevation lower upstl-cui11 (ei WjIlow #root) than downstream (@ TumpilCe #reef), 1# appears that the calculatiotls bid not actount for the do wnstt-earn .flood eicvat`son. We woxild expect the flood elevation upstream to be higher than downMe-sin, The caIculatlons should probably ino,lude a tail water effect or a higher starting elevation (2 36_74) witUi pond 101. We appre-cia:e thv opp(> r� y to assist the Planning Board Qn this project and hope it rat t1lis iiiformacion I's sufTcient For your nee &_ VyDti have any questions Tease dcj riot hesitate to coniacz Zia. Very tTuty yout;; 101u1 C_ he.ssia,J',F. CC: Marl: S- Cross, F-E- 101 Accord Park Drive 761-9FL:�-5400 Norwell, -MA p?otil•1G85 Fax= 781-982-5490 TDaf-a for 687 98: OUTT014 - WILLOW ST- 10Q-YEAR POST rev 3 Typz III 24-HouR RAINFALL= 6.50 IN Prepared by KKF DESIGN CONSULTANTS, UNC, 8 Feb 00 Ryd CAD 1L11 0110229 (c) WNrBRSTiPl) ROUTING .............. ...... 12\ F2] F-, ] 04 , Ull '3UBCAT,,HMF.NT Ft'f;CH PDND LINK SURCATCHME FLOWS FROM PARKJNC�, TO CB-1. R.IiACH 3NT I BUSCATCHME19T 2 ROOF REACH I FLOWS DIRECTT,Y TO 13115IN POND 2 SUBCATCHMENT 4 = TJNCHANGFD AREA FLOWS 'ice DITCH _> REACH 5 SUBCATCIMENT 101 = OVERALL FLOWS TO CULVERT WILLOW POND 101 REACH 1 ROOF DRAIN POND I REACH 2 = 61, OVRRFLOW: INFILTRATOR TO CR-1 REACH 3 REACH 1 = 1211 HDPE CB-1 TO POND I PC)ND 2 REACH 4 = 121, RCP POND TO NEW DMH ON WILLOW > REACH 5 REACH 5 SUMMATION AT DITCH 2 POND I = INFIE.TRATOR SYSTEM REACH P CND DETENTION RASIN 2 REACH 4 POND 101 IGO-YEAR F5,00DING WILLOW ST. CUIVPRT Uata for. 68798: DUTTOn - WILLOW T. : 100-YEAR POST rev 3 TYPE ITT 34-HOUR RAINFALLn 6.50 IN Prepared by MHF DESIGN CONSULTANTS, INC. 8 Feb 40 UydroCAD 5-111 OQU798 (c) 1986-1999 A lied Microclgigputer Systems _ SUBCATCHMVd NT 101 OVERALL FLOWS TO CULVERT 9 WILLOW PEAR= 1.02 -7 CFS @ 1.4 ,96 NRS� VOZ�'�JM = 38 . 5 AF AQRFS CS TK-20 METHOD 154 . 00 74 WOODS & DEVELOPED COMPOSITE TYPR 7TT 24.-HOUR RAINrALL.., 5 -5 0 IN SPAN= 1.0- 20 HRS, dt=.1 H S Method CDERMent T€_ (min) '3 R-55 SHEET 1' LCW Segment ID: 26 .5 Woods : Light underbrush rl=,4 L=25' P2=3 in S-_0008 SHALLOW CONCENTRATED/UPLAND FLOW Segment ID! Woodland FV=5 It=t204 ' s=. 0008 'I ' V= , 14 fps CHANNEL FLOW Segment ID: 58 .3 &=19 sq-ft Pw=25 ' r= .76 ' 0= .0008 'f' n=.035 V=]. fps L=3580' Capaoity:..19 cfs rrotal Length= 4725 ft Total Tc= 276.7 SUSCATCHME T 101 RUNOFF OVERALL FLOWS TO CULVERT e WILLOW IOU AR A= 154 AC 9 Tc= 226-2 HIN 80 CN 74 7 CS TR 26 METHOD 60 E Z E.1 P.4-HOUR Rnl ALJ6.51= IN PEAK- r02.7 CF5 o 4E3 e 5 HRS 3� F l s_ 3 21a 3 Y3 �m -• n� r*7 � �r� �D I� m rFr � TIME (hours) Da. .a for 69798 ; DUTTON - WILLOW ST. : 100-YEAR POST rev 3 ' YPS III 24-HOUR RAZUFALL= 6.50 114 Prepared by MI F DESIGN CONSULTANTS, INC. 8 Feb 09 y-droC 5 . 11 0Q9798 {, X 386 1999 AD-0I Icd Microcomptiter SyateflLe �. S17l3CATC14MPNT 101. MXQFF PEAK= 102 _7 CFS R 14 _ 96 IMURS HOUR 4..00 . . 10 .20 .30 40 10 .00 4 .5 .7 ,8 ,9 1 ,1 1.2 1 .1 1 _6 1.9 11_Go 2 .1 2_4 2 .7 3 . 1 3 .4 3. 8 4 . 3 4 .'l 5 .3 5, 9 12 , 00 6 .5 7 .5 8 .'l 10.2 12 .1 14 . 1 16 ,6 19 .3 ? A 26, 1 13 ,00 29 .8 34 .2 38 -9 43,P 49 .3 54 .5 6013 65 .7 71 .1 76_ 1 14, CI0 51 .4 95_-1 89.2 92,7 95.3 97 8 93.'J 101 .3 102 . 5 102.6 15, 00 102 .6 102 .3 101 .6 101 . 1 99 .6 98 .2 96 , 3 94 .3 92 .1 89,4 16, 00 86 .6 83.9 81.1 7S_4 75.7 73 .1 70. 5 68 .1 65 .8 61"f 17. C}0 61 .6 59.6 57 .8 55, 9 54 .2 52 .5 50 A 49 ,3 47 .7 46,2 18 , 00 44 .8 43 .4 42 .1 40.8 39 .5 38.3 37, 1 36, 0 35, 0 33 , 9 19, 00 32 .9 31.9 31 ,C) 30_ 1 29 .2 .28_3 27 . 5 26 .8 26. 1 25.3 20.00 24.6 U i a for 68798 ; DUTIZO i - WILLOW S'T'. : 100-YEAR POST rev 3 TYPS III 24-HOUR RAXNFALLT 6 .50 IN Prepared by MHF DESIGN CONSULTANT5, INC. 8 Feb 00 rnC'AD 5 .11 1986-19 lien MiC 'n;- m -r E ate PON]) 101 100-YEAR FLOODING @ WILLOW ST, CULVERT Qin = 102 .7 C'FS Q 1+€ .96 H€ S, VOLUME= 38 .25 AF Qout= 9.25 CPS @ 20,00 FIRS. VOLUMF= 4 -I36 A?, ATTEN::: 91s, Z,AG= 3G7 ,3 MIN ELEVATION ARIBA T N C,STiDR {'T]M-S I'0R STOR--TND METHOD {FBI') (AC) (AF). . ._ (AF) PEAK STORAGE ::: 34 .13 ,AF 223 . 5 iI -00 GAG 0 00 PEAK FSLISVA.0l0N= 237, 0 FT 236 .7 15 AG 25,60 213 .60 FLOOD ELEVEf'YON= 238 , G FT 238 , 0 41 .32 37,26 62 -8& START FLEVATION= 23.E .5 FT SPAN.-.-. 10-20 PRS, dt=, 1 I-IRS Tdet= 258 .?. MIN {4.02 AF) # ROUTE INVERT DEVIL - 1 P 237 .21 4 ' SHARP-CRESTED RECTANGULAR WEER Q=U L H-1. 5 U=3 -27+.4 E/,5 L=Lerlgth-2 { .'1 Fit 2 F 233 ,5 ' 1.17 ' x 1' CULVERT n=. 013 L:n60 ' S= .0'1 '/' Ke=.5 t'€=t_ Cd=.6 1?G�#f] :L01 'TOTAL .L�.. -I�AI2G5 {`x' v ELLV11" FEET 0 -2 4 6 7 $ 2.33 .5 8 .0 12 . 34 -62 .95 1 -33 ]. .74 2-20 2 ,69 3 -21 734,5 3 ,75 4,21 4 ,60 4 ,95 5.26 5 .131 5 -76 5. 99 6 ,22 6 .14 235.5 I 6 ,65 6.85 7, 05 7.25 7,43 7 .62 7 .80 7, 97 8. 11 8 .31 236 .5 8 .4B 8,64 8 .80 8 - 95 9 .10 9.26 9,40 9 .55 10 .11- 11- 05 237 .5 12 .25 13.67 15 .11 17, 14 19 ,17 21, 39 FOND 101 DISCHARGE 1 A-''EAR FLOODING WILLOU ST , CkJLUERT 238,E 31 ,5� 4' SldrlR , RE �fFLx RECTANGULAR WEIR � � E Z36.5� r z 2,�f,0 0 => 2.35.E r Lli -1 ?34.5 -, 234.0 � DISCHARGE {ifs) to Eor 68798. DUTTON - WILLOW ST. ; 100-YEAR POST r a TYPE III 24-HOUR RAINFALL= 6.50 IN Prepared by HHF DESIGN CONSUM!AINS, INC. a Feb 00 Hydro CAD 5. 11 00079 ) 8G-9R9 Applied r mmmm±e£ Sy2tems FOND ] M | !HELDW & OUTFLOW 100-?EAR FLOODING B g2 dOR ST . EU_UERT STOR -IND METHGD E Sr a,. 1d Rr nm AK EIE ?a7 FT e 78 QI 10w. 7 s / 60 a� 9 5 e STO G aea.a MIN 5m 4g LL 3 2111 1@ _�------------© -��- � TIME (Go -o) U /19/2000 13, 24 FAN 791 382 5400 OOLER & ['OLAi4'iO IU l�ti2 LANTN1 ~ ENG`NEEPS AIwU hL'tFN IGT .lalltraay 19, 22WO l:Ictda (iTiffin Planning Board 15 Scl3()Ul Stj-eet Non Andover, MPS 0 184 5 R : Sty}gyp ea }entt l Ezrgi�rc c ring I evic (2"`E �v 9 Wit low Street )''mpuscd Office Subdivision Dear s, C'yriffin- In response Lu yuux-rrgtiest, Coler & Cola ntunio, Inc, hati reviewed the revised sabmival package for the above i-efemnced site- Tbe, project has lose» Fevio--w d for confonxtance to the rcquirc eats of the " oning By-Law for Siw Plan Review and Special Pe cm iV' in North Andover as well as standard engineering practice, The submittal package included the following info mation. Plans Hntiticd; # "Proposed Site I]evelopment, Willow Sfree1, North Andover" loc,.atioD dcscribcd as Map 98D- Lot 52 consisting of thirteen sheets dated 1{}1I 199, i-evised 110100, Prepared by MHF Design Consul(ants, hw Repoiss Entiticd + "Storm awr.£1r#anagenaent Report for Pi-opi3snd Office Bijilding Project, W1 Dow S(rcct,North Andover, MA", dated IU21199, revised 1/00, Prepared by M11F Design Comltants, Inc, • Hes1)muse letter dates# Iut3uaiy 6, 2000 wiIh Revised Application for Site flan €2eview, abutters list and NACC response letter- The site is located within the North Andover 13nsi€Mess farts, Mom specifical)y it is Located on soijth est side of Wi 11 DW SEte-el, identified by the Town Assessor-'% Maps as Lot 52 on Map 98D, Tho proposed Site is cttj-IUFrtly u n dcvcl oped and contains approximatel y 2 ages- The proposed development includes a 2-smry office huitcting Nvith a gross floor wren (if 7,344 �,f, and ascocialed drivewaylparking area, landscaping, lighting, ithlities and drainage facib6es- 101 Accord Park Drive 781-982-5400 WOM013, MA 0 061-1085 Fax: 781-982-5490 01/1S/2000 13= 24 FAX 781 982 5490 OILER & COLAM1` ON'10 Co}ej- & Col alljonia, 1nC. €1as i111)kli the given data into ii h ydrulogy model to C OF]fi1:111 t€ie i-esilits. This work was conducied due to the lack of iropW data fnT- the submilled hydrology made]. Seee Drainap Comments b0ow fcW outstMiding i� ices, Nye, of1Fct-the following Comments: ZONING BYLAW i_ .`�t�:;ia}il f,•,� 1 $3 E1 ilil{;fk22S' F; <Ii�L' il��k� ;wi�3i'1 I>,t.�'� �,{'.4111 �3rd.1�11�:.i:2i_ no pws=lwsed for Ow site. 2. ;1<,C11un 7. 1)_f It as LHVA'%40' if OIL'' INX-1;{.srty i•. milltoc? to tfT t='�1T}�fi3a1(}1,r� Eltkilcfsid�€±. [{lz'r'.i1 (CF'. A) e vitu1i1_ €hl by-1aw sUit=�,; ilt 11,15i C11iV. fi,:.' U 5) pof CL.-,q of iIIC. ]11ilih1>uni €o}. i1E'{"si iYL( i1Vd f0c' /Urlirlf� € e J-VKJ nihc� r rNin 1,,ind lcliralk-.Lf within ii jioc, 1(1k 1LtjfV 41 :? _kVC.'t1,1f1d VC-, lL11C(:-EE6ki ' M :4%'C(oliknit-C,, ivilb lhi• WeE€1111ds P!-ot{x6; n tt,l:��v, Repo V t eIiy 11kix 1-ii el'tV i itot s113x j z1 1.5> tiie: ("HA :_eitexia, rT. AJo t 1_3") k- k", OUT V-L1r12h1tis,v,wti is E;mT ti d {1`T111! Ole-. t'i rfs5il�.c's f Y-ont `ti`i€�ii�.:R. T1 j eJ'C]pt1-;e0 „c;IIr;kC : 1S 21 `. RequIrcd Lol se{;tfon 4)i Illi, ApplILu.itiC11 }'!sill -o'Je:w €14TCi r� Ele 11i1}tj1::[`-Lf. I€1c. )~'lovE ,1E�if I Ratio wc�ulci r{~:lC€ �},_7t�=.€_ 1.1: L;tl i9�11t.IL' ir.ilLfs 1,1 se t't.l5t,}li o11kkn �oI, 'lte Plan RlwWlv 111t, not hint zY3odi i�',£i. Tlie App icatiiaml for Site Plan Review has heen inodrFed,no further comment. 5 Sec'tieni n,LP,)c., Tlie plaw. tire ool SiL7w'.d by the "cofes-;sutra€ Eilgl ltict, ;.3d[ii-esstd, 8.1)5-f[}„)iY.) 'NO b7o',11 ',fWLHTATiMIMi :l; l.)CY iJ,MY fel' P to the. sjte, filly icaI de%�c rxpinenI Ili1}-i € o-C41 f35Eed 01/19/M)O 13;25 FAX 781 'M� 5400 CGLER & COLANTON10 7 IV i w ,,i'n n cps,,!d 8 1-o ii i i c 3,11 tc, w E Li C'. k). 11 2, fv. A 1-_�Ac -Alil:11,1 h: Ti 3N r ,t2i i lie "Im%x�. w: %t Tb;, crill!j1p4"Iy 1) w a y i" k(P C k iei I a I I I C. i d L. ;L,I 4;va k ki;1 1)f, ic , hv. ul 6, !It M wcrf I ow from I i I 1r, i i;0-,Vea r sto rl?I (eN v, 6',91 wili oyLi. by Elie kifmkl tts. the. nirL! CO.-"he pond i�� th� Srea k0l, the 23-'i g:o Kill tea'a I;I 1 1)(IT. k 11 1'oli t fin c I-,10 1(A s iv u 1:iIu e. Alli I il i osmi I 'q poi.r-'rade" ariL rl,h,,,dCtentjaill basin has buen illadiFte(I aii(l the additional spot grades have been shown. The weir elevation for the t tdimcnt trap outlet sihould he Laheled on the plans or detail. The sediment trap outlet detail labels a height of 5'. The bottom elevation of the Forebay Is 234.6. The heigbi of the secliment trap outlet appearq to be higher than the top of the basin, 2 Y)5.)�._-)V 1_A I I is U I L64c.zi F 11, %'L 11 S M'C', I jW.,.:5_,fj for I J)f_ ,j I u. Nj-,r�ectloyi S.- i-t f cp;-,n-,i L io n I ia,. N!c n Wi i(lul Farr nc v j c w. l?,cpor,�Al'y an -4.qnv, swe proposcil. 93)5_)k.jYii.) STOR M WATI-_'R DR MNACM-, hein w. or ,I 51LI11(if I i C, lin e r1o1 htF:11 -';161!j I jji:tj Wil I)t €llr;i 3.(l v icw pac k"i Fixtei%4it,N.0 td 1 og el uvat i4)wz lin-Y e. I ie Tl q I I hilli f.A. Ilia welland 1111C 1%, tAlowit im ik, p1mi- We eland fkg jituLr[ri he kibefed on Iliv jjf�.iw;. A N0jiL_C o[Ani-cwt Applicalion flioipld N.. [ilk:13 i-il colikkilction %v'Alk ffil." 11 aku lit', 11owd thak Mlo�LLJIIIK� Brook i-i -I 'nk`c 1. (1.o111. ;1jt_i1 2u. 'JI-o-vil oil 01C 'Norfli -�aOover W�daiirk R 1" j f roii I _�reLl _..Vj.j 1 (1:L of I appean t h ilk G iii, -;i ko n I i kylx� -S t A Ij ect I r�L A,��t, I'll I M',I V 11�Ne a -S i f) c"'.11 it i I�)�j Fki�� ol I t be -,j�t� cfcc�ky[I WOkkj 0 fim LP s bane P Lwn la 1wied is o it r mul c!,fit ndi i ig t1w NOi ftivi bii:,-4ni %O1110aed. 112- Scevron 11 ;,, Tonc[(Lar i a Agii j� proposi,df(w the _qiTe— If a 6vpi is -Alowll on 010. plawi WWI S;gll 5; 'W'd, [he location Alould biL 3 01/19/M0 13:26 IOX 791 982 549n CM,ER & COLANTUNIG if Iva no X 3 is i M it !I;.. new on! P CAV 04 swunr an b UW, MA I 5 4}-I !k o-J- 1)L I I I I d V ! L?F A!5 '.!;t��1 "'- i N I((j,IL 1A Y 3'j N t' 3,J t L_tp.j cl J y ,i rk i, c t. 1-t 111(�,xl ic Y "ho 11[d lhi.. slit 3%V.11 1)51 the 01 al?L; que.m ikW jwnpo-.wtl. 4:. L�--Vy5.)t'-)\vi-YIAw dclziil ol, �,Cfwt c- Should tw- sIlovvn oll bn pb hi 1,, A I I J%'f-'LL�,C al-Q. F1 15 5'1. bC 33 U 13 Y I o&C L1. ,5#4 I i...fak:I f.1-dy. zifld rvc is C,J. 11 WX A-) 'File lightill.", FiN a WVS A V, Iwo] ,,,lown afid det"i HCO. Thc I 111 i n zzkti4� dir t-C,c i j o ri and A T n 11 of i 11 U m I n W i 01 A YE 11A 130un 3 h OW ThIs coupnenj ims beow mdWwWrHy Mmsed. 0. socon, R,A)mpnjoi) Viabage 11min Study Lrt;. 9, Whon A I rafLk iTL,;4Y tic 1-Cq1li2 V-d OY 01c Nwinj rig Poard. in our mH1vr- t.1sWjk-q,, flhlt gourd ),rM, review ifte,,ip gvIeTOigni MfM-k11A1iVFh UIPWIAH-tVil W-All IN! MVINed Jdau& 19, Sai kN, HQ1Jv)x A)A. chi mney mmuMon dewd A= N; xk4d N) Mo Mai shcei S fol. [Ile ."xi`%Vo-r i={1 1,1)1-(:4 j()I I j fj�C§ I[)J.' L`•X j,9 4 j jj,'; ?," ck�.1V CT 2 f 11 W j 11%)W S 1he Ann! wheled lor the sewn it appeus io he PAr to the ChAnney uninvol AL 'Mim should be rim Med. N- a si ,20. %ci-kon A IM21 Opal vanly niiy be. reque-sic 1 1-.-y Hic Plamijog 11001-il. Nown0emy Chis walver Ws hall PankA AL Stakri A conwundy impact study may he by 10 Ming BoW. 4 01/19/2040 13; Y7 F-AX 781 032 5490 CMIN & COILANTULNIO of On &A 601 UP.MI&E'l 10 glAKY, ChAiniqN- mul cmmmn Comm AM sons] &AV 10 h W 0 A M 1 0 C C n n 0 H 0 0;1 j F:-1. 1'4 1 k,;k!�I tT'. +L:I�1 11 E[k"'C'P j IL) o 11 ter 01=11 1 nu Is WE& TO runumni On !not KHAWWRY Mms.0, joshav: CypMems CN. C-Y i sl i rl}! a'i i(" 'I JillcI i- %-L-i w-r t h i n a I'L-Aq A 1:1 ood A,i le- A, 011 past re v i um;s Ic ud i 11 g i 11C S tf"�j & . -flop i�id 740T"m 10 kv, the 101 yNx H and e 4 v M k m SFr 0�Le s c�k. 11 ;i cic o f T i ol Q k u `tart ":L]S d e to I 11)11 ik?([ ml t2 I k,V')i it)a 1kt ba"g,d on fo'm , � ob"cl-va I io F1 Lt. D 1---. 3 t0j) 49,f, S I I0 C,L;;L2, d d ow lit'.E-rc';i Ti ',w i-o W i!I o%v !ill-(-ef fi-citil tkOf3 Filc -Li id 7-10TLIVHJ ik-U Slwui SS s v P v f rmm, N u m x sv si1Sw -i"y 1)i q!,L,i i r�!)V- 1.1 JY�r J'LA )1. f i I r' fl F;C]d I`Jf%Y,I I i o[I inulasom T he nPO No n t h an a 0 m d H ed ad di HO no: i I k I'Lm nu i i m fm 1.1 f k' f i's 0}'va on# 1 Or the top 01 IT up p n deO. It e uvue-j?N'dx Rmoll ch?I:Kd i(11 k N 236.74 a L T a to Pi ke H Treet. I I I a f Mod minva tion m U Hzed i�1 I k LSfo 1) ev N ilop Pr j Cf.'" wa--� 611scu, 1ptl obscr U" flow-31 ICVdk, Cf'J)Jfj JjjC 19%3 NJ4?j'Fj1 11(143 -stirvu.Yed Onvo io"S ahm g T1 it I?ikv "�5 rk'ot a i 01 e o i %, 11111n;Ld `.iml[a I- Ofor mothm, 1 f avej mbit, bit a Lt Hzed IN 1 his Si to A" iv-tq), the t-1 i Fpl.k a Lei ci)l 9 1 d j tie,It Pri P I Im mv f No nhi i on m in th v roval eye I almuml Q I rig ogy i mai let it) d.v t ei-mi,-Ae t1,e E 00 y eav fl knO;Ae�--al ion al. th L%- jm si(. if i�likOy thai ti-jim .4t-w-111re if; rr'5t3ioiVv uld ;"h106 elemiom mead 011 elegy -ntioll i�i Tor: pike Th�-- 4!�11 t I-.A ..i rt]t141ri, co vMs Is I if'{1 f 5 1, pipe,it ele vg Ho n 23,171 An o vvrR.mv vireir i,-, -it i+-valiort 137,17. The applicant has nok satisfactorily addressed this issue. The finnd elevation mentioned above was at Turnpike Street. The applicant should submit similur information for Willow Str"I, if irvailable. Ofberivjw the Oullef structure at Willo-v S1 reet should be included in the pre-d evelopmelpt hydrology model ti) determine the 100 year flood elevation at this point. Thi2 100--ye-m- ri oc it I i I C vtl 11 on all "lie i; I'l k:]Y above (']C Y t ri o rl '.7 3 8, 1.1 L)s�t I o-11 k 1}i.'; C�V.V.](ioll (I le f k3od w atc�r 11.0 m -Mo..'q L6 to I i o L ma'' 1-0"'!)I I. i 11 1---tc It I' i Illp"I d j I 11 o 1 11c: doICT11 i u n b.mi n cau51 Ti g PO'S'.-'i b 1C Nuod P 1-CiN C.nl'; ol I an C I tiff -,i t4-,- CompensiiEcii-y Hood momge nmy lic required to jmjlltme pt Elie l?hm. jstom .',1101 L Id be 01/19/2000 13!28 FAX 781 982 �490 COLER Rom k I at:; ;I I,-;pf i L'-ii t i!a: 111 ii 's 11 N 21 J judic�14-,S MOW ramp; W WHO 'Ah Achminn u� Ito MUNYW VMWOMm use Me UUM aojlaC:cnt w W3110 v w, .n,i 1k:cs Pic c-1,j kjrk ? lE,!io -..1-:.3�rj1; -1 lj�i tj,A I W [i I A'r ic-'d 0,V I'It, Ft)]Y-. F L( Ile AM& AS bewl muduhn! hi ITHurl ON dMign lWaL m u I it.:IV.,I [v)w t 11c i S I i i L L1 co rLd i i u u t,4 j j-v c i it u n bc.E." L�.o rc c�f Li 111 i S he.d. 'd EEC. 6"1 il, :Ili' w c n(j,; :k p 11.1 vc a ci)%,f--1, de scrir b�(I a\ ,L The '111&5 xIiqj (,I I t.yc, ri i Lin(,,c i: cIocu t nk,-n trd ,Yood,i u Iv. Li 1wt ly loc atcd �v i t 11 i Li I[)�- %V C-t 11 n q n a m d nvi Rs W T R-S 5 in 7 H k n- %vu)4 i %�-(l?all d",. I'he. €M JLIJ t i" t 0 hi�A 'k s 1"L;i r CUMiiiii)TI L.ijj [C!cowd hi mvdmWs it Be cAuuhdoun The Rush appown lo he W f�i i co nd i Ei in-. fit m-u v i,i i i s r, -ca i!i up W p A 'Ph x f i c dh k w c Wcu Mm,'i cm to V We d t 0 ro 0 c a t Wv c utve. n i i in b(-.rL, Thu v-,c. i it.i ki ,W-i ,I t:J:C r'j[3 E 1.1 C, I-If 1 17 hAved al 14 j 4:11 vt yj-pc} lb i-p r-opc mcd k:oi Wj I i of-r-s j IX. cui 11LI!�1LmL,.v ror i 4iffLiLLY CDYi,'J' tyl3t~ fn�v c,\ik�,fing i>, livAcfi w, 70- 11 le. pi(.j pmud ct-n id i I icms ci tf ve n m i ibe r a hou h I be in o d i f ied cmi!,i s;c n E xv h j-��i 'ImMons Ar "Wend uew Aw 'Niver Onwholon W powleyciapulm 1110111hunq Subrahlunent arms 4 A. )Bld 4i 74. -wam"'.d. weil"im; curve 'swmlm-r ag?d Mksll shmAd he mmlilkil u; h!t;(-r-R)tA ahkwc. Tile calculatiolls have been revised (0 reflect the(Awrect curve numbers, No further comment. T1 3(:Tj t i it, M'Conc c M vat i ol 1 L.'k I 10i-i 4.)r� i i i u, z:.ond i i o 11 s kkic�, vi wi a ppc-ar 1)C.I d GU 5 1 d I t i 01.1 L.. Tht.t 11 ow p.-}i h show t i (,n 11 It' Dc�v CA 01 kj nc,ii L f J yJ 1-o[0,,-,y N on a Ul he Inn gc,r I k w p 'it) 16 A. T hn 0);i"i a 11 g d i tA-11 shf I E I I d a k'o Ew, j 1 Ic I ucli'([ i F1 E Iv" ,!'i 1,rii; ()"Cc)riC-c i t rab on c.al Lij I a I io ri.s- ,VblE, V-ON i L,M i imt o f c I 111vuat i,a!ius-t di.;e5 not sIpp al, to ref kCl the gi-OlUld condh in no Car I h e m p w a ry no `fife.cn A du I hAns int'li Ed c z�h � flum- a ad sim How ,enicentr-.1ted 110-ky. Nq*mwito Brook cmktalns a (ki'mcd chaklpwl and 91mv. a.-O %, hould he includcd in the cakulaflans, The revised calculatiom Include Hie channel for the time of concentration caleul3 Lions. No further cummt;ni. OR! hydwAgy imodei uppm to youb: Mwqchmam fkjcri 5 iWO �hc dcu�jilOji bil S iT 1, 13 1 L pc)n 1.kc po".0 Ycv e lopmcml H yd 1-ul og'.y V I 51 a� m Lhca M)m(,t it S d1ac'.F; 11ol ap p;";I r. to H o;v i EIL cl fli 0 Cie!I V.ri 6 On I las i 11 6 0111912000 f3:29 FAX 781 982 5490 COL ER S COIAKTOMO 1110 puldr! in (IRM U in Mow if k Unwiewl r I h;1 The yonin wo jwu 1wal I A ISMS Uf Munywhilm won 5 in pond 7 WSMM6 Caudowd wo-, -i '%w$ 6, A ,`) i*k-* 4) i3 s�o 1,-!�la 1.i,.}i 1 17 11 j, 101,- I Ili rd i4 b .-� hv!,3111itled �R— r ,,Vann hisrawUM) Wind"! 101h IN rupin'. Ej I fT J-i' j Ej I't I 6-11]It t2(I I I r1 The required inforrantion has beensubmiffed. This comment bas been salisfactorAy WdnL."ed. The vc mf dra&pipc appvpn in hove approm WCO 0 RTi W Onva-- ti w. t I Ej I F o;l sholl It I N: sul 3n)i 1:0 o 1,, 1 l w E, u ;I:;S1 L I-C 10, pi J)rt i 1 zs tK 1CL[ki"L(;' P,F)K t'I JLj �fj, y -11jS -L)y [W� �;LdIjrcl io fi-o"I 1w.-wes, ill tile,,!�Jj F()l 'J)�[j (I 4�,�) L�J'. 11ijw. In k It74 f13 I d 13c i1 I on t L'.J-I 11 1 rnI I IWO�l[1C;(L U 11 tai ir niA MRT The shut 1 y A h Ad as AM a i mu, 1I i"i ('om men I has 1)kwi I na[i rucrf,j-Ry vild rvzjsizd. T& 8 Mr al w M er -Maii a£c--o ieti Rl po rl.Mat L L, I t IV 1-3-MI"N wi 211 1 t)u Vt., ;I VP ru. i F r)ale Ty W of Qu TSS, R it wMar how His in 1 t�Svn&yd. 1% apM wWAq INS TUMM spRodsheen WoWd bo Qwnhwd TO mpoti Maks Te sm Rnwa famlyi-iy I t0ed i I I A p pk,F30 X U. T1 I j" i-I ful-n ja4 ion rx ti bo(,i k i t-ic I�td(-d. TL 5a imc.111 Wha y A n o k1 he de Q gnnJ i m oca"i W i(;c wild ilia,. 'FT S W rul W-;I i.c.1, rVOM Wal eRje je.:jL-)' (�f R,�kf'(, VMS 4twill ated fo L: w�.Ll poj & Thy L de3igj I PPRIUVAI rtite- S1,11ed ill 011'S i arn i w a I er '10A 1111 gel BeFlit IrOlky AMC,. 'this killon deJg�njlkg Ow wil Powl Jl# whOl flke Arid design i-literia 1kL;1:rRw1 11) the Polio;. Two cw;CVrt14 inchI6. (hip. filkik 0 C U SV4 i�RelS i fi)Ye.NL�: "d.11 d t1w. p otu;)I in ud n n',iv ki i-,f gvu i zrsd kq,I ttnr w h,ich tjt'ay VPS141 jJ1 UIP PORd dl`yhlj? 0111 ikk the 1,1F1F1lFW;-. 'The design has been revised to an uxlend ed detention basin with a sod]men t fore bay. DEP allww s for 70% TSS Tr-moval in a" extended detelation basin if a sediment forebay is included. Me TSS calculations include a donble Credit for the sediment ftjrebay. It is unclear if the TSS removal rate has been met. L1 Fl�-J f thL.CiCE(;11 t,04 IM A i h us [he j DN U i F'd IN-art,'r I I U t I I ly \,(i I ume bo ko w he T)y e S-t il u L ,1,J le T-L qui I-C d 1vnw,i,(y i�i W y y A u me awl the vok a nn pro Aded So u 1 d W. SlIbITIA14,d� ';pis N)Mm en I jms been no HAM My Ad d It.appeaas lhi�I t thic iri v��- h� jIlled I)iPIL aikd �,-Lsoc k:R51 1),,_ rl,l,, isivt-,rt in(o Ole 1.4 itit-1 StVU 6.1 Fte !AIWAA 11 1,J(Ch I I IC C1 tit I C! C41 M VO I i I I Ve 11(A'234.55. 7 GE/Jll/2006 13: 3e FA_l" 781 982 5490 COLER & COLANONtG QoOg The stormwater volume to be treaterl has been ca4cxclateAl to be 523 enhic feel. The sediment forei+ay has a capacity of 22 cable yards or 594 cti1)ic feet, The outlet +veir elevation frnin I€lie sediment forebay should he iabelcd on the plans as well as (lie ma feria I of the berm. "bi:,, sediment trap ou lie t height should he inodiifiml. Y..,asc'd (511 1C"s pis 1111 iht. 1' . I11(ollllhl". t)O'tIIS Al :IppI11x11IS'ItCI c ';i } Elv`if)w 01 ., k!rl:'lr'.ct. Thf' 901 C Tdc..ca610' s>i -r!,pro.,�,;rt�8Ec1y .37 Thu.c, abuit f Iii£fl 1irt1�s_G to ;kl]�lri}:3111izaciY . Vi-,3 Jl'ho ;',sIiaiatt.d h-i 71E I?Id %x tiof. ]21i10CA U11 ilie. 43kim, lS } 1.67, or i tiLA ioN'Liig ,Ilk, '21"N,{1 c.1C.%::16(1t1 ;ho.t�d �-c St1s?ifkll`._..('s. JI �IFt UMLIMI W,)1i I Iti h 1 0 1 C,-r 1 h all 61a( i ed, rf1t. wai%�E,gLi lITi4 VoI111111. wit!Ziil the cl,-,wrl€.oc PkII l mil2 ' lac ilffccicd- V'Il(` ;i11tC4 <`,k�V-,l 6on tkv-, iler.k'S 1 Oct 1 col 1N- 11Ls23 ';-,I 4`ln:r?"!�ttkrltJ;C.. w,' Il-i!r, wichin €hc %i-C# 1)Ond b} -.!oiv 1�11(` iti#':'rt un! (. 3='. 1r44:3 lse{'#i :ticl.2.3�f r t#I alw r,l§c 1{1� ♦tiir IK Stm%ll ,y br'lsm the 234.5 e14.v{li"llrii At4mld �-Pl- iw k01°r1lc-d 61 lvli%3 The bottom of the pond bas bccn raised to elevation 234.5. This issue has been safisfactorlly add remtd. l'!3t F0)Vf-ft F11111 JJJL' 4i4![{;Eiiid.1111);ISif� lf3fJfi:]f"5 {� 41t, bilk- :?FFd is m:.,1fwrE3} beIow the 111vOT1 4.1C'. .:§lIoIl il1El f)i 111f' d0iC III ioII I);1: in. N1I-, w'tI ;'.,ltlS4: i? 5?{lk". Watt"r".lfllk_4. on f11C E�d{fEllilti?f: "li� Thi_ 1,35' l ims iwkn rS3kod tti (!li!',V<ltifl.[z ?34- i, There are two details for the detei><lion basin cross,section. The details should be updated to reflect the revised €lesio. �.,;IIcl11,1[,1)r1s For II1r, pm5110-iOd 15" 4)LQTVt Jlii)c 1tKi J$' Ei:f Pit?t' ri:1 W jIIU%V IFisN �txk ltl;l be.�mlI)mi I F i( I I w pipa',., 11avo t;r¢t`.g(vaiak c-rli)';cixY fa the 100 ye:�e ;,E4�rl�l c rsl;." "l�f�c; c,alc>t�;lEi+fir ;,E3{ksl�r� Ellk€Ik1�i. i EMV.S IIjWFilcxit`.)l[ U,r tIt+. [)Top osed 111"1111IL11 , 1',3il atcr imtl,tcr�, ;N)tod ;kko be €iicluded itl the L::ilc ulatis)11rr. 11 is iisEck-Ely- from Unk f k1h11iN�;€o11 #!:sa#. failwAf-j- tlfjlricl-tl, lrl}r?ac o}�rlcfrrt��l. IN) YC'3 U IkO0 Cie�MiOl-, ;,4 23rO --.74, 1 llic 1_3vii=vj:e0- 1,1 f'ot:#lei.',aiR,ti-.•!II'�! is 11 4.2'L 01;r vhl ?ek birlic.%tee 11[tit roil w.0(-'r 11MV %'MI '. Wa-ei• to ove),llovr 111V 1'Fa'0s c € l tim m} (h1l li rl area (4:ont4 ur 2 6) 4)V the, ma pond. Tim sl km if be jra)sm 1)r-IddiIiwl'll spgt grade,4 sbrmId be xItriwIi 4n t11js The herin has been raised. This issue has Ibeert gads&aclorilly addru;med excepting any impala of the food elevation at Willow Street. 8 01/19/2000 13i31 FAX 781 082 5490 COLER & COLANTOM0 ZD10 A wcu RYWA A q opowd Q Q VY 00% 70 1 cc, M nip, yanno i 1w 1A p'�- r i ti v '.E 1,; w?,-r n j 1 4 1 11;, 111 oc.€i J'i ci I .-,I w,I €J t;I I il i I,-- (:s-ov..ri�: ill'i r C 11 111N Unnumem WN heal no Nn"AMAY Tile design has beell MQdMed. PiPP. 0-own:q Should MnEch ill the Manhole. rhe L I I-L,I I.1 b IV, j lu I)C.- ill k-Fc i 0-t I OIL,. ti 11,u L'i SC:If Tkk- 11117 j 11�;)I 0 1 W")10 r C It,V;1 t i 0 n An"k I ho me w an ha 5 nPOCI a r Qw(w H=1 ;c v a In A v i A d he c u m A Mod bw Hw n RY al s n wMA of�- Thin cuummm WN not hem aMwoet THre dws nut alymme to be- rn frid 5'';0 r(i wi 111 i I I t h e-VV.?t pon 11 d a 01�g_ i I e 0.11 Y -n Vew rj,Y, This has been safisfactorilyaddressed, Additional Cokumcnts 0 1' --'Cdi I i1c.r1l I'c ril J.o I Ccnvi: &,(L!i I -,I Po ki Id i ric I u t Ic h ia On ag Wed he d iia the S!*j rt)w,'ite Ma im Eli' m Rc po rt.4 is [LEIC11--ij, Micie We UncyalMN is WCAN'd- 'hf' -1 -'t (4*1 j 14)f i ITV. Lffide.Fd 0'li FT [�l Lt i t i L, 11ot ,-,I if)"V;1 ;-141 t lie 111.ul". It is I)]t i. al-id 0.-i'"Ullid i a g Ub eye all aw ki 1idf'-L-d 1-n il v; &P I IA�; proj V 1, 7w propo,,cd bui Wing b adjoceir lo the illn"= W w The foundmion Q I i o ].Lc' 1L t Cui i El:111-, w 1 I I tier' i 11C.Wsj ii, A pu rt i ni i of the wa I I appe-a r.,; t rk he u hin Y nQ W ned w i I ic app nix hna le iv it ��r IC V'Ll t i 011- T'I I i N L_11 1 SJ 10 U H N- by lhr brAilding. inapect(w- 11L. It is our understainding the building hispector has reviewed the plains and has verbafly approveA the dtsign. dew c��rrme�kts Thu out lut inve-ri elevation for the infiltration tre Pic h shou Id be shown on the details and the, vent location shiDuld be ShOWn Mi thC PlaFIS. Pipe bends in the 6" D1 roof drain pipit gh mid he reduced to ptz vent possible clogging. The pipe shoi P1 d be Nmigh iened or clean-outs should be installed_ 9 } 01/19/2W 13:32 FAX 781 gat 54 COLER & coL NTUNI n S011 The g" p£ pe4 ated pipe in the '1�lc pt T trit!nr dHajIsh ould tx, shown at dA Ol! £a% Weu|| r, |aelc opportunity to a&,qi.5t the Pan@n/Boar£uil iMs projectand hope (ha( t his, inform al gsl arm& mf2m#f ed& We muU be pl toIEcdgqhthe Board ur the dcsign enginceran discuss Th a prqjeet at yours n 6 . Ifyou Wvc mIy aL nsple �/o not | oIQ&laCm cullicto Very �l Vim!% CO RR & COL NTONIO, I C. ] n C. Qhe. lm P : M«k S. dms& P.E. Jim kale # 10 v� a �t+V 4• i -ter 04,1 V-d if tl yJL,L14f},A.it l--ti_sii+,sa41 Yr. w.. L COLANTON10i ENQINh'EFLS ANO SCIEI1Fn5T5 January 27, 2000 Heidi Gi i ffi11 Plarming Beard 15 School Street Forth kndoveT, MA 018 45 RE_ En in4.;;rina 1 eview .LQt 9 willow street ProposLA Office Subdivision Dear Ms. Grif in, COO,-x & C'oI Ultom0, Tnc, bar, rCtcivcd su pJcrncntal informatIon ofo Imiaary 25, 2000 for the above m.f{.r erttied project. The submittal included revised Plans and additional hydrulcgy calculations to determine the Flood elevation_ A comp Irtc ►-Cspotise to the suppleme.utaI i-iforrnation will be forthcoming- `l'he. plans havo been revised and 0Ut commer ; ha e-been 95% addrvs�ed, The revised calculations indicate a flees elevation lower upstl-Lum. ((Lai,Willow Street) than downstream (@ Turnpike Street). It appears that the calculatioLuu did not account for the dovk+nstreatrra .tluod elevation, We would axpect tht flood elevat;cm upstream to be higher 4mn downstream, The calcuations s�hvnld probably €ndr Li le a tail ateT effect or a higher starting elevation ( 3fi_74) within pond IOL We, appreciate the ogporm6ty to assist the Planning Board on this project and hope brat this informa l cars is suf#scient for your need- If you have any questions please do not YFeSttate, to cowact u3,. Very iTuly Yuuj s, .lohn C. Che-s:a,1',E. CC; Mail. . _ Cross, P-E, 101 Amord Park Qrivo 781-982-5400 NOrwell, MA02 "-�E,'U: Fax=781-85Z•5490 06l2$/2000 IG:42 FAI M 1 982 5490 COE1E I MCOI.; NTOPYIn �It}U1 J OLANTNI Z r=MVi1rgFCgG ANu S�-iF;J171C;7 ]tine 27,2S1MO Heidi Cn iffin Planning Beard Town Hall Annex 27 C harlcs Street Norlh Andover,,,MA M845 1 : Final Plan Approval 140 Willow Stk-eel Site Plan Review Special Corkditions Dear Ms, (riffin; In response to yuur raquagt,COW&t ulantonio, 1M. has reviewed the final glansOt for tho above rcl:;re,wed sett.We have compared Elke submitted planset with rhee latest IL-view sei skibmitted 1131M entitled the SFLMU Hrid for con fminance with the ertgirm-�ffing aspecfs Of thr,Netice of Decision Special Cundit)otis-OuF 1111121 feview rely ive to the IrlanSet SLPbmitted un M 1100 ivas r-ornpleted and all issues addressed.A comparison of that plan t ra Ibis submittal €�;ts�thdicarfld sto new rcvisiatts and xso discernable dif€--rences in C[mteylt,Based vttarir review,the plans comply with the ealgiFEccring re[lttin:istenis of the ccial cartdilinps-Tlb--subMR1a]packmge inOuded Ebe following information_ flans lvntitw "Praposad Site 1}cvclap41ent-140 Willckw 5lreM Notii4 Andover, -MA".Dated Octubcr 15, 1999. Rovised Mardi 29,2000.FeAormed by piton&Garfield,lu,Received June 21,2Q0(1_ Reports Erttillecf "Site Plan Notice of Decisioq-140 Willow Street"-Dated Fth avy 24,20M. Complated by the North Andover Off ice ofCamtsttuiity Developfuent Services,Rc owed June.21,2fM. C of pTe iatc the oppartiblity to assist The Plalll&g Board 01)lhis project and hope ilia this infoiniati€in is sufficient FcM your nerdq. if you have any potations please do nm hesitate to Contact us- Very t[nly yoms, CC)l'.lil2 &COLAM'ONIO,INC. xc N1F117 Design conslpllante, laic, F34k hand 101 Aatoni Bark give 781-982-5400 lriorwell, MA 02061-1685 Fax: 751-982-5490 02l15f200C� 15:30 VA-K 781 1182 5490 C01117"R & {:€}3AN'JONJO IM401 COLER I L NT N10 February 15, 2000 Ii�irli Griffin DECEIVED Planning Board ��� � � ��� 15 School Stnc c# F'l-ANmjmrw DWPAr4TMrNT RE: Stipp limental EngFnccring Review (3) T-rat 9 Willow Street Proposed Office Subdivision Year s- Griffin: In response to your request, Coler& Colantonio, Inc. has reviewed thr, revised subnx tal package for #lxc above referenced situ. ` he prgject has bccrl reviewed for to the verlukements of the"Zoning By-J.aw for Site.plan Revie%v Ind Special Pennit" in I of-th Andover as well as standard i rnginecfing pi-aetice- The mjbmitUl package inuludecl (he following information. Plans Entitled, "Propcsctl Siic Development, Willow Street,Nortlix.Andover" location described as Map 98D- Let 52 cansisting of thirteen streets dated i 0/15199, revtwd 1131/00, Prepared by M lib'Design Consultants, IJJc. Repokls Entitled # Response Ietler elated February 9, 2000 with drsirragv calculations For l00-year si<arrn to determine the ilo iAuv tliiurr at W1Ilow Street cuivcrt. See 1)rainage Co1nJxwnN below foT osxmand-1ng issrkes- e offer like following coromerits, 7DONI G BYLAW - S;4 ctkon 6,1 ) iS k4 L9] c,Ic,-rr i f-m.y r)cw -siyn�: 1izl 't- b},Cn Proposed. lb�posi�Frll 11f) si4n'% �Irr Pvo1311.wd Fo€- the site. 2. SLCii01) 7-I),I JI i:i UIICk,ar I I`(hkr 111-011COV is:?iI> c ri Irt tlac-Co,It tIL b1c- ;fir n (CJ+) C.rltm-ia, Pkv by-law datcs m leasi. y F.ivc(?S) perc e---Li of rho ........... .... 101 Accord Park Drive 781-982-5460 Norwell, MA 02061-1685 Fax: 781-982-5490 02/15/2000 I S:31 FAX 781 982 5490 COLER & COL 3iNI'ON10 1003 !Allkrh UR1 io] art.zs fequi ed !by joAM; sttA bcs Ci'.fktlgnwjR kwvt W€ ar 01% hart,t loc;Itk,d IVithin it Iian ideik6NaI as wetIm.1d 2-cso{ irce ill :ACC-411-J's %v.iIIi zh.- WC11ancis Protrcti€ill Byl;,v. iw{t kk'.�l ky ii, S�(A Y,;I�k,�e. ;I to (he � 13A Q:1'iiE2'ii3. i, C"l�kk)Ti f, H 1n our undC,1-:rwAng a v,rri.Tiwc WH5 4°'ImliCc'.d hem we I':'.qfrr: A 4- SW OH A) I I c It ir I I sO;lA; oCi1tc.ill pi ic{rIio;r kv- Site glair am.fckt: .M-AMsId LIU I110ds6Ud. -I'llL F)oor A run Ralio s17u n I d Teal 0.0:1- It [so '1itty3- Los }ti'- 'Flat' pplis',16ou f+)r. w i c ,l htR Review luni val Tieco mmiditk,,d, Ke Aplp#Emlhn Or pis-c Plaii Rcvil ;v lkn [t5}utl n'tts(Wivt:, Ito t'u:•€mr (IOU3TEk IM, 5 Sc`r, NMI S. J, c'. TITo. piam7 "ire I10t_ igT1LEI lxy the P1 TWYiitC-T. ;IWi$altw.fly 6. 'ie($ii n R,3)5-)c-)i-v,; N o :taI UnC11ESli -111ces L€r, they aray k'eh%� to tkxv 4:iics pfi,zsrcat devei lravC I k4sat{-{I, Wpa).#t.M no ye 11 exist. 7. Src'+.ov 8,: sjc.}V.) T1w 1}nTowd 238 cnamiron Tkn: %vast side ofille [lutC116oTt h a A n has been dmwa i�w.onvct[y- ,1'tta gra fit; s�w,tiI(t 1w s1,.rtivil as ;.a c i loop- The 238 ronwu Y ;hmdd he Shown IN t isernI zklwly the top of IhC'. :def{,ntjo11 Won. 11P emeIVCUCY SP#lWay is IOcak d „c 111e TO;]est a} tif rn.0( iAhe Prjrtsl's Iie,ni. It splaar, lb r nve Maw IS loll the I00-yr;sv 4ior3n (elev. 236,9#1 whI aver top the paJnd tm i.tic t;o3ttkturK %id k- o QE:e 1)ctnd in t1ic, a.-CLI 4)9'0te �3 con€.our and 16!}t tfzrlt:!£g1k X h e e A Nt-,�(vacta).'e, A4diiir} AA ;s£Itrf grS..da Nr-,, 4,4 v kiUaiil;II v-sia ]Ias 111od i ied, A 211 the ;ifs 11ilINs 11 sj)ss# xC a-A de{ I1AI-V hte:k -%ha i< . As %ve-ir elcytt6,-n fev the . scrli7njfi11i £I-11P o11flel-.boil Id be l:tl1.AU11 on f h r Pi4jis 1`1, >t[ptAI, -Che i 141en t trial'~ €lltzet iivtaiI 1;1hob; % h;��$;;ti 'Yh4� hottttm =±11c 1-01-CbAsJ' is 2,44.6. 'Fhe heighi.of thn sedhk; ent #rlP fmIIUI nIl Ptz,I's (t} 1)C' ItigIIex, 01R;! 01C top 4AthC, 1ii, 2 01115/2G0(� H:32 FA1 781 982 5490 COLER & CGLAA''i'U 10 004 A, water gaaiity inteI tank hAs been added to the plays. It appears 1is though the requ t•ed wa;tu quah y vohure has been provided. This co;>c>rarltent)was been satisfy farily a(ldreswd. S. Mif;11i NOT fn.vij 1l k ttiMOM -i:V, 1101- [lac site- No i12fo1.11latjori i1}t" €)aci1 SAisliRed 1br rc°w•fm. .Rt-.E or1i €tIY• �jcr gns -re p.> opot ;(7. �L r1, S-rctim1 &:i}`i-}c.} ij-d 'i'C}i W ATFR DRA1r4 G11;, �ic�c heloww.. 1 w ,Sec"ho N-:�K-Mix..) E'xt4,1 m- NAflditig oloyalioiix haw rr<>I hen; °R1hnt3= vsk E>x .ei ar IMUMP, II;'+'vIi!mx hat:o #;'ct.xa S€1I111-AR'r'A. is Smi on Tht, wizAfand 1it1p. ii" �;bv vft on t(w plall. Werlail l j1,1i' M€r17€>4`, tL,dv�ulc€ bc. Wed an Ow {&nm t1MAW o it iA it rkpplii',216on 2€hog tid lie riled ill CC)gj1111cliCNI w i 0 1 thiI alne;pr 0 ion. It 0hon d ako be U ON tIrli."Mri -ttliEa r;rool i.i a 6vcr fta11l RY=:t as si'm ii m the NcjrUi Aiifkivt}i WitlIa (N R egti€,)kiol1;; RA`{?.rap{1M A(ca Mkilis (Pigurc € of 3). 1 t 5 p pe.,Lm, H4:1i fi4e:Sits €play€c slit}"eci to T11v,1�jvt ,, �`ct- k j]aS €jj,,y 11.1%. signs i 1t:nIit iIlly cf on t!St.',sile i"?f.k. We(ilkntt fl tj�:3 i€1m! la€V'11 lselat 1vd, I is aoi- a31dv sl7sTLlWitg Hi l'a!U kevn WbU5ted. Q. Sodial K3)5, eIxii 3 €I t", k1i1CI[',i11- ifiL Si1s)l is 11.[o�T�x;�cl Q Ch0~SRO, ff ;:?pI iri propo} i7AJ' Ilie IociiIii?1Ftn1wt1Id €)cA1t7wn an tIic' -}la1ii,-kviIh ,igo dianertsioFis- €3, SI'{A0n 8 3 ]-)c jxi 1}ENS w neon V id f HI(' 3IC211'C5t 1-o-51 kv aye ; i4ndioI-cia-€} ci11i<"€1;11€ it Si;'f IAP &3)1.fie„}x3Q It is 1iMeaf iFouIdutn..c(ora c 'di:,v41 ,rri:�is -,I€v pro€10 ell. 11-jhu c a art €)rn€11~ hcc-:}SlouW be MY a, Ace €1hn Oe1-wioor star;geMki I i y :�..=-easi :ire it €31,013(me.1. 15. cdiNi R. )5)Qx Q T he loco imi and -de#.iI c)€'i-c.ILtst_ tircas shoilIt€ bi 'hc 3w 11 o11 Etc; pIUJIS- A11 resl`me arcrkf� ;mist he ICiIIy c ti 3 VAX 781 98Z 5490 COLER & COUNUON10 11005 SCS011 SQ5 joyA ij ,f he 1"hb ng nx AMC; have hCell Sho'kvil 11:d kklai icd. ,kit J3 6 111-I t i;'J'I I i!l F I d i i-t:tti ci i� and depwo a C H h m d u Rd m i ha vc i mA boun shown. !I N cummen! has beel, SuAlluncily uhh-cloqed. f. Siru m B.uqin Study ,S-�!t ce-mmelAq 11c'.111w. Is. S a 6011 S -)c..)x 4N-)A on 11-i c. q md y mky be kii i-t-!d by t I w. Maim i i iA P w i4 vt It i.� On 1, it ti fle.r?fq, a d i n g I h c P Wn 13 i 11 D m-1 rti 1-V M i-L!V 4-�V i c if g4ni cra 4 1 f)5) i9lbum"tijim suhiuftfl(d wilb the re-O"Cil plau3 , 19. ou on KA 715 Je 4 x x A A inii i cy co I i n 1) 1 1c,(,Ii I sliq 3 uld bc.ml d c-11 U) Mc d ow I 8 3' YU�Iil F. i�I W i 1[0 W -CP0 6 1 by-I lit, m,W1:,r Ufm 11 ec.1 i ml i n 10 the V.r,isti 11 L e ate I abc I ed ftw i�it I t'wc r j nv vi't ;ippcaui i o 1)c pi km- i.4:j Llic, Lhiniticy C-millecHoll- Tcfii�3 :3holfld be clarjfiu�rj- jl;JN. j)V.C11 14 uir'd 2ti- Rep v 0 4�([iy th j-4 sy*i bjm b Om gr3 l 12 fed. 2f. S(,'C j j-3 11 8. X ij j) A co n i i i t t ri p i I y i m pact -,i I u d y rn Lay bc- rcc I i j cMcd fly t pl�rmmg ilo.mj, Ri'Lpor-ludly Mis w8ivi-rr bas Neki grnWi d. q2- iun 9,3)6 j;I i I Q T h c god&o t 10 Ftdgo mt I ermi oj 1 r,00 ro 1 hin s[]oil 14J ,iho%v dic I ount ion a F ansion ca q hA mca qt i rc.-- �j)el a d cL;c ri pti%)5 1 n i t I irisc 'I'll iN !!o mul mi t ITO s !,)c k-t� �a d-9 Moo r0y ;W1 i rvmm.0. 124*i�co�mniimms I be c x j q I ing s i Ec 1,Z3 LE I b Q I.,i i t a F'E'M A Flood Zo, c-A, OE i past re kr e-&,s il PC.111 cl i n�g fll,S I 1 p &- S l i op ,inn 74 0 Tt i n i pi k e,-d 5v t 00,yeat f[ocid c i m,rl!i 03 1 pi t 11C h s k b of A mp It S AM vam dc mm Not 41 bo,e I c vi 6,L)si 7 3 S I>;x suJ oil j k pcl 1 4 0211512 0 1.5'74 F.kX 781 082 5400 Cf;lf R & (1Qi,;'+N'MINIO ZDOG ols fir time, Thy ; S tvP & SI),,)p inru.j Ecd (tmv,I,Viceaill 3crntz.L, %VITI*,. S tve- I't's)IIk r.[cis s j'k e -Iil 'tIF15J)i�-C StVCCA tS iICkWtk��ff'.=tf11 JC1-0 sTOrax�lr}sl �,VeCi It'0111 SLOVJ & Ski ?J). .1[1V W> Ohl' r',iE k!�}?ti '.:kt;l, ��iC �300d 4:1CV• 160n 11c, app]i1 !au3 E :iBN Lu1)Ik;1i1vu.4; add hia31aI Wfk)f fikUtft:fk 6t! t�?L` lisuod cle`r; Aitaia ho-tint SCol; K Shopj)rojei tL The aim,.Itk-iI Hood c°levatsoIX tc 236,74 �f UP S 1. 'l;ix�t Pond 4JV_v,tt1':u ;utilize l i�l chv fop & S)kop prp.,(A�.t wx,�. mu.i`.d oll i4:3scl.$wd VFmIi levc.Is fi'[t131 Iht` (' ct1>iFsw 1 4£) mbt r,n 9ind litlrvc' EmI �'lE' a1,li�nfi ;1#Cii+, Tlt 1'aipii`4f StN'. r 1.t1Kt t`t{ 'i i'4, W"{_ C`L+xT#i?1CDd ;1i113is,.kc iufx-l'fiF S4111, 11 avaiI:kbie, b1_x vtitxxi.rf Iar vc is sits}. Al Lei'na ivcty chv aiixptic,mii (.0illd blc.hld . file w1 tlpE 5wochl 1 ill the prv-(1k.Lvm{}prw.11t hydrology f9odel i4p e (lls tlift;s'i�,si` iwl :ii 3.4iG p0i111, 'Ii ik. Ul:Ay IImi ibir, 41it'e�t_'�PSt'It is $ad Mimi Csi'vni.ilms excci.`d 4114 ek-, 'oHRi31 iii TicrTq)ik!: k7fcr. .A.1) 01lil(A Sit-?IcIu!'t vKists on I i i e -it)trth Lqidc col Aviflow S(rev t. Ti i c ou. let. Wklet4,t:, euww .is Vs OF a 15" pipe et A<'.' a11:imi f.317;, Aii vv e01mi ivci ' is ,t€ 4-)cvatimt 237.17, The -2plit am li:ls :tot snOstnetcl:•it �itic`� s [l (his The i'ic;od e€vv,i iml §ai;LEI lftk fj#C t ;aEj U J.C. 11:[s s.C't'tii-iipikc :-.%tv xiR 'Thr- applicant Mtrt0d.s1il�mit. Shull ar ill for. lTimi fol- Wil141W 8 'c et. ;f ns';til�AdCL, 01ItvrivixU. th€ 'rr1:1'.0 ,0roc'tavk' M Willuw Sfrk et Sift uld 1)k< 4fecl tut ed :r� thti pre-el i FkVcis`oInOv illl;•iW t.,� Jttf�5rt,:linc the :i][t{i;2�i' fief Oelg .basil 1t bis voidi. 'Phis comment hsi�; been discussed with the aptrticant at great ten gth. The calculafed flood elevation ss Ancrahed iu the February 9, 2000 response toter is etovat Gn 237. This courMen has 1)2en s a th factoirily add ressed. Thcs I00- -ak' tlooEi c.lc vutio.o on-fist aL� €ikely at)oYt.elevation. 21 - is On thIS CICk.,IfiRla 111c; floott waru- frolzl M*"glE.kito B1.0C)t; Iouy t-vSult 42 lmckwn Ier fs7rl s ld: t11to tix; 66!t liti(;11 bgislki C';1U.'Ing 1N)3�Ibltr'11Ood P1'I Tlvillr. crk1 'kt11i vff ic% i-� 1113 1C;11,aI;�CIF Oui ragy-)11.1y bt. r[:qk t t t.O: i0 111 qk[t;I 31 ont tills. 111a11 A 11 Stl C, ltt,Ll be r f i4i till 1.`1[L"iv from '111 (Nta supi)i 4ed th,: 9 €leis wn• :1d di-es ged. 011 v i;idi, pc nkleifl cbeck >ii:cll wi>.s ,A1D l 1r t'r ctfts to MI I I u"!Ili 510tl4i')0 0f laif��al�ct•. `I he Dr,3fELI9 C Vitk'L?hi11011S aFSL' t11s° 0Uft -t Stt'kti[1jt`C; akkiit(c-rif in WiIlow SErC�=?Skki #1 it,si,fl po1�ii �k� 1�1c kl}riEc,}o �c; E3it1C�4l. 11 k.: cia:ktlt:f :^ :lI! :1.5 sltc}ttici i 1ita;cii�kct to FfAIC4,A t€1C P,-%ki i�IL� tnlXsmJ-1[?1 ty ally}7iol be 11Iniled 13v Elxc pvojx�t'y 1 P'nC. The modd ims hevl1 Titodifi;4d to rci1e:f t1;it, cit'Nif;r! i3t11tk#. 5 Q2/15/IOOO 15:35 PAX 781 982 549n COF..ER & COLLIUNTOINIO ZOO-7 i it �:. 11in-1e�.r1 Tlc)t�' ill,: �:i�:t�iu;cs�ilallEt��rk t'ltrk�c= E1;tt11��criU ►3'�:a-� f�.,�<il3�tsf1�<I. ti��s4:�1 tis.(5ks nkLr iie vi i. rbt'! 14l ods ipt%k- �c) it.k 'k: 's ['1 vur fIuL� -,t-ih-W as, V{1Lid- T I i c 1,V0'Jd:, aria MOM I)f fnC�ltl'Ai'0.'itllitt I e VM a MN A nd a C11ne ttktMj1= !.t{sCtlMCkanI itk aI-r!t`:ttdilS<vklt to T R-5 5 is 78 Ar "'c>s1 wd ;€A.'. €'11 bnlAI t,�de"criIwd w, skit' k",, odilirm -ruld lug"rif2d ill 11'i.""kinds 1T.r ill(.! N!0 F'lCOS ir-,B::3tti t{) IK', j0 f�it C.(Tik#if't(n3 1ico.",\rCr, k11k.`s ill"s:tt I.`.: 11pl 111d. i I1c' i'L1.`.kkk1'g 4-,w]S,li ioil Cal C 0 1 al i i)jl ,fio uIdI Ix� revi{:ed to �-t;l me the csi l'C01 CLIkTe f�ltk),�1C3;3. '01C, ulkf+:t, llkiillb{;r i�i'�i';li.)ill9° 1.hc by-LmIlAv C,H L,Lld C4P Cr t}114 f[1t"111-OPs SCd COII ditiOTTS as .1R. Tile o;"ilraQ- for a ipiiIiireiwtr-�v type 16r+:.xih Ai tip k'.undjti ill E i�', €i.,ic.if ;k; 0f `Hit.- 1)r{"0an1 tirincEtikms Cl.tiIT T3Cxk)1ho"iht`.l d he tl1iodiflr'{f + 0lv isle! lkith Q';.Isii:ai� The t't+s's'3 A'�scxiptiom for sti>~btaisMw a m 4 stotl dd he 71 •,i.'he 1YQ odrod SYCtilln(I L'€ff;'i- 1011 hi. - :€r€t1 �w it�c be t: odifled �;,i esc-rii eLd ukwvA. 11, , C1: [`-' 1.4t fi'n, ijaive b[Th IT V iSed ta? FedtCt '�hC 471WYeCt c11I'4-C 1?11Tlt i rs" Nil fast�tc�• �'UfY3�tE�'ii�. k ne oE`0mZcc;o0m6wi l;:flg iF�z I inyt fi.s- c;�i!,i it3sf �.ondiijk�xlu Tc vv n 11ol Hydrology fiefti E_)1jik2tliQM, 3 hr d OJV �}wh shmvu (12) ftlh_ 1'L 1, uc:Iotsr} {`.lit �#y4a1'olog.y' 1.21"m :;}sF c rkt , w k 1c5119c:r i ian 430 . ;c.t. 'Chu cxsstiilF, dildt stioldd bf} iLm-34udW io til, 'fS* of C'c,oxrc'11irMi. o M11Mki mpt . The t-uQua Me uF coil C mitn'tiolI d(W.s 001 aplaur is re ed thv i±romild (:Oil J itimm fir Eire Ikew are.is, T1)c i:a k0ati.otw; i�icllucie ,b�,ei ?`hwe anc.'s s;ialki43' i nffi2L)�Yts;xierl 3ioYxj', 'Brook' uo?tb1 'Pus a defined shy mipl siop(.- lmdS -Ar ujd bl" i>aOIW ri ill liar e.O'"'e€fsli[stvs. 'irct}'cj•Ee4�-j 4'kkFc`7tl.fjr;la5 i�xi~.ltljfiti t9ke. Ch;J11IICI fiz j' the tiakZ$`. J�J'rojtri J2ftfx1i4Dn ^:AYet�Ia ill pi"" Fait Fill-#hev- !o inn]rcnt. T tLwt I�ydi-ohjj,,y ltiodt� ] 'rtF p at:; to ro u to Mc:ktirhakt:olt kima 5 iwo 0 is cloc:loAtl 11110,1s Nhci Pout ?.3L'!C��}}E37Ciri. I fylirology Itkl Sl 1'tea1 d{)'fi Tit?f a1LTs]k,,ac to flmv 311it) tale tjcwflfk)1L 1„rst11, The i33t 1el lF o4.0kirit trt 16tv)s-', I k a11f.Il`...r #bai Ok!2 C-mil%Ilx!nt b3rs 'wv11 ittc€irpo rakd itt1O the t4+'ss{;1><. '11w t"Oesthi di-I ,rx"I k and appin-Ir', to rnolQL .t Isoi!'0all 4 s0)C:ftC"2niotnz ary S to powl I tM"w1%gt mulbiried r11 uri 3 r-, 5 ;i,,A 6 ?zf:i{.1 Tail t'il } lzifof'miikimi ?iod iapt it C aln, Pf ;- Me ;7 ac .) s illil{f hs� siol.a im'.fa fin jvvk-w, 111G)rF3i;#don Fl1C'.hkdi'd wilt thu k-epm-t T'Tie Yi 4-p1 jv(fd hik 4i #"±Y11i1l'inn hus 7''i'€'n sai$]mim—A. ']Z= c.olYSiIEenii has 1},*rp Sit#iS�:2T•trkrir$ #i�;i�ri`�:'C[�, �i OV15/2GOO 15:30 R41 781 982 5490 COLER & COLANTONIG Zoos c roof a 10 0 p p a m LO Ini Lij ij m-o,6 rj ial c y fcc t o C ci i v ov. Uf 3CUM('41 t iO R 49 h PP hi be v o b R d M o I "1 H W pip to "17"4u vc i It-,- 11 ille I ia, ad t�q lial U lxum!L.i for I hi 7, (1 cpI h o F to v cr Ibis n n q be Q!cM to WmA ma K, ins Hic !--o rk i Tl,',' It; md be a 3 gi atni I ma�1) C4)rp?,?]1. The jApe xpau.rj�.11 h:)L% umdWd. Thp pilw it Nbele,4 iNivlik irtm. 1 A i x conmv U t Ims b-,,vu Say i�-Lfav t a ri ly ait is mi-sed, TI ie. S 1,6,),,,,n k%.a.,i,v M W a WO W1 a R!L,plIA "',hab,", I-!I- BM 13's Lvi I I lu%.C. a kppl-u X;a v-1 f-, Y M of Tc US. 11 i,, mi�-tc-i5 Mv Ods is dvWniui-;d. flu:- ;ippficLlhle TLS,8 Imuml spnodshcrt Anuld he MOMS. IS; ruptut m1alm IS medinvNit !bjebay dcAgn is iodude(l ill ;1%ppcjjtjjx IL--., ttr iilfbn,.-�at;on hm", 11M Thk:. f6robay WhoakI be Wipmd W acviiifhi!ict* {with tile assillm-d or -,malcd Jll Fv(qmgernt-ul N&L-3, is 79MU, -This, ramovul rak is bwwd tIpwl ffivw-e-tt rvwW ;it %vigh 01t R#vkl, t,msigo -uifcdm 11c3cribed hil (lie Two iklcj f&! (111, fwdk 0 V a s c d h n en I Imb Py I n d he c patai Md flue tmi I i opi of p-on n d W n I P.v Nv I may VeW W the pood Qhig out in the wavvy, The (ksigl3 ha&been ICBM to nu (Maded dennah"i hmAn AT a sudimcvt fu reN I Y. DO-P 33 11 mvi ro F-7 1)% TM 191-ILO-V a I isi zi 11 e Ytt!U(lvd d 0 ell t i453 11-'s?a ij, -t stdialvilt forcbty is biduded. Thc INS vakWOHMIS jurink, n domble vredic Or the an d We n t furel)11Y. 11 i�; 1i ii elvar if I I w i9SS rem nvflrig11 As 1wC.11 )1.%of. A water' qa ali(y i Met has been providr d. Thk comment hats been satisfactorily addressed. [ is L r1i r k a r. i f,I f Ic dc.tel it i Ui I b"Is i t1 teas t h 0 -cqi K i watec q,ia I i Cy vo I u i Ti f- he in vv ri ic n wit o u L T he req uked suncr q u,,j I j ty 1--olij no -ru id It it vole n t vt p ro vid fA shon JJ I)c R111hmilrkxl- 'loin CoRynent im heml UVWWWAY uddrtLsned- ft apkwarN th-A 8-c Wvv-ri iE1 the headvall and RSVOWINI PWC can he rakvL The hivert into ffirL outle'. st 19i:i i-.(o rc 5 ho it Id irn R te h iLl--,("10 co�1 tro I i I 1vt S.t 0�2 34.S� T Ut s tot-mml i C-vo11m E, w 1)L- il'v aled 11'a 11cea v,,)k,-i I a t t:d tio b , 323 c u M c f,-v t- The wdhment Ffpre.j;.kY 6;1s a Jjf� pj?-jj% jjjq )r9.4 c �J& fe 0 utl.-t w6 T- e. WPM 1*0 m the x ed knem I N W) W 13v. h1h eh-.r I (I 1: th pbms WN M as Me mannini of the berm On InHumni Wap ambi bAcht sho-Od he mo4WicO9 7 W/1&/�000 15!38 PAX 781 962 5490 COLER & C(H-ANTONIO 009 See commen 7 above. This carnmen h A-i been satisfactorily addressed. 13,.Ised nrf tllSl pit 3, moffling occm--,; m approximatoly 40" bttmv 1-111� m I r sly`. 'ILI rfac c e Im,-m i oj I i-.; I a w b n at I Ic ow w on n f h WSK23M. S -A, If the gm ind waWr j k7[10r I h',11) 1 4aT et I fIIC Wit h-j:C[E[Fi k�f F;11 E io Pi 11 o nd 111:1), law a Thn wave ekwtHMR hm; Rhek,kt mudifl't-d Oil 1[111�L 1'i I�I i T1 A 4 C W k]i jil 1111d 13CIfAY V1 ,i overt au 1 (23 d 5) h a S h eem i ae lu d ed in I h calculatkins. shomid not belpeNded in M, ca lei llit6imm bot M m of A I P 1"mi d I'la" ;�ev)l j-x im d 143 ti cv.11 fl.oil] 7�3:1.5, ,11 is. i--is U t, It as T11v i 1-f vf-, i ri(u I h�-`dc I u n t i 0 11 ka,j Ti ri;I o [)C,' low 11TI(I i", �u 1111111 Y buTo%;; i il vl r L ej ev Lit;oil (1�1 10 f 10 do OM Ami I MW h L A 11 i, wil 11 C.rtl it [)a)kL w-L tilf r of to I n n "Cho invert bas Mw i-Azeil w e9L--YMk),3 23)-t-S. 7 have a 1w I w 0 dc 1 a ON for Me d con d0a b oil V n ny n ml on, The 0 eAR.." A mdd be a pd tcd 4 o reflect t 1i c rev i RA den igm, The details have hem T),e coin I ra I outlet ks labeled as 3" on th c detention basin section detalL The calculations use it 12" outlet. The detail So=be imadl Red. alcu I FLi�D ki R [6 r die p ii-op L)Scd 15" 013 11 f!i pipQ, old 18 1 I-aill pips- Uri W i H C%v Stnm Muld he Submitim It A wS if ow p ywg I I a�,-0 ad cq u f,1 1 u C"n'lac ILL 161.1 j 1C. J 00- p,,,jt- -he c i n cwtiL 1 -r te illa,i on,� �31-ko t�id �tic 5 title 110 I I pgv�Ld, 0 ,I o f 11 1c, pn Tnad i m W I(;. Tail v.,,i I e r i i npw Es s hou W Ow bf, i n;,I i i de(l its 0)%.,. c;t 1 L,4 11 w lolls. I i is u im clear Pro Pin 1 h 0 1 ub md SMO-a that (.9 i I watiyr 11.3 kpa k:is Have ?i{!e 11 ev,!l E"t ted. T 11 C I DO Year Pt}qdk 0ewl flo;; is ?3 6�74, "I'll(' i F1 VVI't zItttlC OP fle.1 rit!-2 1 Cti I�'e i-i 23421. Dar a hv"k itAd h-](�-3 t ln�'I. (V 1[w-I(e 1, nwqe IV a ter q 0 overt i U%:v lip h whi hi I h e s n tab ern a ru a to n u h i mr 2 3 6) of m e wed pi) fj. 'px;u 1)Cum I(?,] be rmhed m, addhismal Ypal grades whadd be nhown hi vlij,' tacqW, any hqwrt of me Root) eli,,waigii ,il 'wiljow siz,vet. 8 02/15/2900 15:3,q FAA 781 982 5490 CGLER & COLANTON10 ''Gko -Avow i:nveo q sl i ou I(I 1w i n041 i F1 4,fl _q ti:-1 I III E 13 i 1)t!. 1,0WI IN, I r I'l k.,l I. This vaummmBc NatisLiO-ovil). di's ig]t hut; 6teil rm 0 d Ri"L F4 P 1, ct. II n S %I k Ou 1�1 115 a t 01 1 a I h 0 Snam b u K. Thy should he reviewed by the DepRrtnmeir4j.of Jilub I ic Works. T h 0 0 mgM Eoluge4l i Sc. tub sho 1.11 c I bi��)n(Id j F1 r-I- ,Fh c V )I tin kL, o f',t(11-ilgo 11 c tow 1-1-w i El I utud wo mr W a"6 on sir Lo C r Id lit;;-cro ;};its Uir ii i ip,�ct Do A 5 M; dw k! he c o K 4c Frf i !,,-;v i M ,E<i i i iv� mc3OC,1,-4T. Ilia comnueal Ims um Was Tlmrk, (j1-gk,5 41o? R"Aln-,tr is be t�.I rf i ci C-it?t freell nard w R h hi th r ml P a 9 d d u F-i ng, tb t, I M y em, ;tp rm t-vcu Ty p k-A ty I' sI=tsuId be,1)rrov i 0-d. T11 i, i N t;u C. Eras t i is fil cto C11 Y ;�f I i:i Additional Comments Tho sob-iiwnt tons vo! i'-_mC0-fIC'U0 '_31101fl(l ik)(71111(1e hiYb*K.%4 sit3 Beni-IJNXI' in itw Stormivmer Repoo- TUR "01-MMlit hu� a ddre (1. It iS QTIC',C!;H: 110I Wif-kmirain in foc tEt-cl, Tlierc is n doah of Hw undudwhi 1)Q f j 1. is FIDE �hffjk,�j T)n tj LC 1)1 a I)$, 11 in cm I r an dem'.4�H(I i u g (I I(-.1-€ .trc no if Zmk�r4r:t i us hw th�s, pr(,j CO. I-hC J)p) cd I,;.,i Id i ng iL, aLli acet a (a i he dQ on On bas j u, Tip, 1bu j1d a 6 cm I Ima I a mmo to be ,i m1a i:n i i�;�vdt 1 for the I ms;I I polti on o f t13 u wa I[ 'Lill PV,'l bo t pt?i 11 c,i'ged hmed na HV appum 11 nn I a %V V I ar ciculliori, T1 I is dL!.,-,i zgo �,houlff lac R)ViOW4�d Thil, be Hildressid. on r u ndmo M ad N g the h u ild h�,s'p C"Or lu)s vvic.m2 d Illy p f qw-, m o d 11 lis Ipprowd New Ompaents T'he"ou I[et inveft Ocvzflion R-ir th it-F I trafion I I shou I cl bc, !if�U,,v-n an rh(- and thu VL>Ir Jocutit"' S110"I'Ll Elf-, �Lhuwn ��w O v ,lags. Pilic beiid�, in thi� 6" 9 I 112000 :15:40 krh -i8j 982 599u Glfi&i{ (k IEi AEi1L)1 i uL.i :: ... l:fir 30?�'i Ttk3�} txtp�$houlii �7G 1'e'dUC,Cd to pl-'-Vif7EI p{]SS}�]1E L`�ix4E}Eii�?- T!t };l1zi; . ;r��bu�ct Exi~ SiY��e?�k�ee�cc� rsrtyl����ti-�7Ekis :fix{r��tr] i3u i��5[atlec�- Satisfactorily addressed. Ilse U,pVC perforalc d Pipr- ][3 flie 113Lereep[[11'trench I .''iboilld be 9hi.}l' n d3' atisfactoirily addrc-ocd. e appreciate the oppormnity to assist the Planuiug 17oard on this pwjc,ct and hope that this information is sufficient for your needs. We would be pluaEFed to meet with &o Boat7d of tie design en&=to dise,uss this project at your convenience. If you have,any quesIions please do not hus hale to contact us. Very truly yours, COLER& LAIN`l ONIO, INC. Jof.n C. Che.ssia,P.E- L:C Mark S- £moss, PR Jim Rand 10