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HomeMy WebLinkAbout1986-06-16 As-Built Survey - Detention Pond DEF SUB Marchionda &Associates, Inc. Engineers ig acid , F October 8, 1991 North Andover Planning Board 120 Main Street North Andover, MA 01845 RE: Cranberry Lane As-Built Detention Pond Dear Board Members, As required, we have conducted an as--built survey of the detention pond for the subject subdivision. We have analyzed the site hydrology based upon the as-built conditions and we hereby certify that the detention pond has been constructed in substantial conformance to the approved plans, dra inag e calculations and the design intent. A copy of the as-built hydrology computations have been enclosed for your file. If there are any questions please do not hesitate to call. Sin erely, A tl; 1 i,��`"a a chiohd& '& sox to Inc. gionP' 1 & arcd�s.j,�:P+,� r r President 4 1 ,' cc: Flintlock PAM.L10 62 51ouivale Avenue Suite I Stouelui:u,MA 02180 (617)438.,6121 Fax(617)438-9654 JOBG�t.ra.ai�.• -44 4 MARCHIONDA & ASSOCIATES, INC. SHEET NO. or Engineering & Planning Consultants CALCULATED BY DATE 80 Maple Street STONEHAM, MASSACHUSETTS 02180 CHECKED BY DATE (617) 438-6121 SCAL .. ........ ........... ... ....... .......... ........ .......... .......... ... ......... ................... ............ ......... .......... ........ .................... .......... .......... . ......... ....................................................... .......... ............. ...................... .......... ........ .......... ......... ........ ......... ... ................................... ...I..........I........... ............................ .... .................... . ........... ....... .......... .......... . .......... .......... . .............. ............... .......................... ...... ......... .......... .......... .............. ............................ ........................... .................................. ...... .......... ........ .......... ............ ............ .......... ........... ............... ... ..................... ........ ..........r.......... .................... ..................... ..................... .......... ...... .......... ................. ........... .......... ............ .... ................................ ................................ ......... .......... .......... .......... ............................... ...................... .......... .......... ......... ........... .......... .......... ........................... ........... .......... ... ....... ........... .... ......................... ..................... .......................... ........... ................................................................ .......... ................. 7 ........... .............. ...... ............ ............... .......... ..... ..................... ........................... .......... ... ....... ............ ..........j.......... .......... 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OF Engineering & Planning Consultants 80 Maple Street CALCULATED BY DATE STONEHAM, MASSACHUSETTS 02180 (617) 438-6121 CHECKED BY DATE SCALE .......... .......................... .................. .............. ...... ........... ........................... ........... ....... ............ ......... ..... .......... .......... ...... ..... ............. ...... ...... ................ .......................... .......I,�.,.7......._.....__.........I,..iv�i.I!IIiI.!+�I. .... ....... .......... ........ .... ...........- .............. .... ....................... .................... .................. .......... ....... ...... ................. eE ........... ................ ........... ............ ..................... -P .......... 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DATE:_--- PROJECT : 1 3—L:'.--0 1 CF,r=,t•11=:L1':f--(' 1 ti iYR(T PE I I SHEET :---- OF----- -------------------------- EXISTING L,1_tBCATC1HI-10-IT DATA --------------------------- I ,nl_iC;r-:AT # i S1..ISCAT # 2 AREA= 2 . 25 ACRE' ; AREA= 4 .5 ACRE Cl--.t= 4 Cl-,I= 747 TC:= 12 1•11tl TC= 19 t•1II41 PEAK F=L.OW= 5 . _; I_:F:_; PEAK FLOW= 9 . 100001 OFS RA I t'•IFALL= 4 . 5 I t-ACHES RA I NFALL= 4 . 5 INCHES unL= . µ AC: F=-f . VOL= . 69 AC: .FT . SUB CAT 11 3 SUBCAT # 11 AREA= . 77 AGRE':1 AREA= 2 ACRES .ri_= 9 t'lIN TC= 12 MIN PE(iK FLOW= 2 . 1 I::FS PEAK FLCIW= 4 . 8 CF : PA I HFALL= 4 , 51 I t,1C:HES RAINFALL= 4 .5 It-ACHES VOL= . 1 :-; r)I__ . FF . VOL= . 3 AC . FT . =,1 BCAT # 1 " SI..IBCAT # 13 AREA=—^4 . =5 ACRES AREA= .93 ACRES Chl=. 78 . 3 Ct,l= 81 . 2 T C:= 17 HI hl TC= r? 1­1 I N PEAK FLOW- 1 1 CF8. PEAK FLOW= 2 .8 OFS Mlt,-IF�'�LL= 4 . 5 I1-,11=:HES RAINFALL= 4 . 5 INCHES VOL= .82 AC: . FT . VOL= . 18 A .F'T . ------------------ EX I ST I I.16 ROUT I t• G DATA EX'1 '=T 11'•1C�^MEP'iCIRY DATA r -------------------- MEMOR'r 2 1 Z PEAK FLOW= 10 . 7 i-':l=S PEAK FLC.W= 13 .2 CFS ----- ---- ..1. tr:, tf�ay�, i�� I •C_1 MEMORY 4 PEAK i=LU,.1= :, , 1 i FF.: PEAK FLOIAl= 6 . 1 C:F'S ---------------------- E"'i ':1'11-16 POt-AD I I-AG 1.5ir''ITA ---------------- f l:'ItIC 14 1 � 1 �..> t , P0[,4D—#----~ PEAK i il~I T FLOl PEAK OUTt=LOW= 4 . 5 C.:F' . 2=i i'il: ,FT . t,lAX . bJATER CTOREC~ . 2- AC . FT . I f I - I ! r r5l LL I - ! I I --I I I ....r ..--r .".a .-i .-_t w ,--t ,--, -1 -T "al C) I� f3 J .-.� � '�- ..-a w .-. - .-e I cr LI f Cr ,Cr rC '::, i::� C� Cl Cs cj C. N ..-, w 0 C. CDC. CI rD o C, C» C' �- 0 I C. ,-, 0 C, V tit 'J 0 0 C __ ,J C, Cl ,C tJ L C' 0 0 e-� tD (Z"D tC, Cr ,J Cl 'C< C '-s [�5 ,;,,,�C, Cl _' i ! 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FLU tW= 9 . 8 CFE5 PEAK FLOW 16.6 CFS RAINFALL= ,6 . 5 ItlCHES RAINFALL= ', 6.5 INCHES VOL= . 61 AC .FT . VOL= 1 .28 ''AC .FT . iis SU6CAT # 3 SUSCAT # f 1 ---------- ----- ; . AREA= . 77 ACRES AREA= 'r2 ACRES Ctl= ;8. 6 CN= 74 . 5 TC:= T' MIN TC= 12 MIN PEAR; FLOW= 3 . 7 CFS PEAK FLOW= 8.8 CFS RAINFALL= 6 . 5 INCHES RAINFALL= . 6.5 INCHES VOL= .28 AC . FT . VOL= .55 AC .FT. SUBCAT ## 12 SUBCAT # 1,3 E. ---------- ---------- - AREA= 4 . 63 ACRES AREA= '.931 ACRES i CN= 78.3 CN= K31 '. 2 I T C= 17 111 t•,1 T C= 9 H I N PEAK FLOW= 19 .3 OFS PEAK FLOW= 4 .8 CFS RAINFALL= 6 . 5 INCHES RAINFALL= 6 . 5 INCHES i ; VOL= 1 . 44 AC.FT . VOL= 3 AC.FT . i 9 I ----------_-_--.-______-- . EXISTI1,IG ROUTING DATA ! --------------------- -------------------- EXISTING MEMORY DATA --------------------- --------- ----_____ rtEt"10R`r 1 - Sc� r2 + C_ MEMORY -2 � '� IZ + �c ►3 , PEAK FLs. W= 19 . 3 C:F:= BEAK FLOW= : 23 CFS J i I t i s — L ti tv1Ct-101':`i 3W ���� �►�t� (�� � ��., 13 t�lEr�10R i 4 � PEAK FLOW= 8 CFS PEAK FLO# = 9 CFS ---------------------- EX I ST I I,IG POND I r^ G DATA - ------------------- POND it 1 � � 1�taD POND # 2 - r PEAK 4 . 85 CFS PEAK T'; OL ITFLOW=: 5 .25 CFS I I MAX . tkiATER STORED.- . 52Z i'•,C . FT . MAX. WATER STORED= . 4r., AC. FT.1 li 1 7-1 CD 7 1r - - -- - -- - -- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -- I' -- '— — — — �::- .-� o I�r'j f TI Lr� LI -D- -4�. :"�J :,.:' �0 0-1 W KO N) r..'l r..,! 7-1 . . . . . . . . . . . . . . . . .. 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DATE � PROJGCT R/�/B[RRY LAN� - 100 YEAR (TYPE l \ ) SHEET ;____ OF----- FOP P0ND R 3 CUB} C FEFT PER FC0W[, H0UK 0 . 4 2 .7 3 . 2 **************************************************** 4 . 2 4 . 8 l2 , 1 *************************************************************** 5 . 1 5 .2 12 . 3 5 . 2 l2 4 ******** ***** *' * � *******************************if.**** 5 . 3 � 2 . 5 ********************************�* 5 . 2 � 2 . 7 *+******************************************* 5 . 2 12 , 5' *********** ***********«»***************** . 1 5 . \ 13 . 1 ************«*«***«*** . 0 ' \ 3 . 2 ************************************************************** 5 . 0 4 . 9 � 3 . 4 .-A-- A, 4 . 8 13 . � ***********«********************************-XI . 6 \ 3 . 6 ******************************************************** 4 . 5 4 . 4 4 . 3 4 . 1 � 4 . 0 :1 **+************************* 3 . 8 3 . 3 3 . 1 14 . 4 ************************************ 2 . 9 2 . 7 2 . 1 l4 . 9 15 . 3 1514' 13 . 5 15 . 6 15 . 7 15 . 8 15 . 9 16 . 0 ******** 0 . 7 16 . 1 ******** 0 . 7 16 . 2 ******** 0 . 7 16 . 3 «***»*** 0 . 7 16 . 4 ******** 0 . 7 16 . 5 ******** 8 . 7 16 . 6 ******** 0 . 7 16 , 7 **»***** & . 7 16 . 8 ******* 0 . 6 16 . Y 0 . � | 7 . 0 0 . 6 17 . 1 ***** *o k , � 17 . 2 ******* 0 . 6 17 , 3 0 . � . 17 . 4 *****o* O . i' 17 . 5 ******* D . 6 17 . 6 ******* O . o 17 . 7 «x***x* U . � 17 . 8 ******* 0A. 17 . 9 ******* 0 . � 18 . 0 ****+** 0 . 6 18 . 1 ******* 0 . ^ 18 , 3 O . � 18 , 4 0 . 5 18 , 5 ****** 0 . 5 18 . 6 ****** O . S 18 . 7 ****** 0 . 5 18 . 8 »***** 0 . 5 � � 18 . 9 ****** 0 . � 19 . 0 0 . 5 19 . 1 ****** 0 , 5 19 . 2 19 . 3 O . 5 0 . 5 ' 19 . 5 ****** 0 . 5 ' 19 . 6 19 . 7 **** 0 . 4 \ 9 . 8 0 . � 19 . 9 **** 0 . 4 20 . 0 **** 0 . 4 � � � rvl NOTICE OF INTENT Y �A�� CRANBERRY ON A RESIDE StlBD1U'1S1 IN NORTH ANDO vRM MA PREPARED FOR FLtN CLOCK REALTY ps O. ROX 531 NORTH DOVR, AA `"tH Of 1986 1APRIL pm14 No. WON �FPARFD BY P1 'i CHIONDA & ASSOC- # INC. M tMDPRETE-MAR ENGINEERING AND PLA1JN1NO CONSULTARNFD. !S SHIRE 03103 MANCHESTER, NEW RAMP 80 MAPLE STREET p2180 (g03� 434 -8725 STONEHAM, MASSACHUSEETTS }!, (617) 438 6l21 1' i CONTENTS Page Notice of Intent (Form) 1 Document 1 8 1/2" x 11" USGS Plan Soil Types in Watershed Document 2 9 Hydrology Calculations 13 Document 3 Y gY Document 4 Construction Sequences & 34 Mitigating Measures Document 5 Site Grading Plans Attached in Folder i i ss Form 3 DEOE FOO No. (To ba proyided by t)EOt:) Commonwealth City/Town i of Massachusetts Applicant Notice of Intent Under the Massachusetts Wetlands Protection Act, G.L. c. 131, §40 and Application fora Department of the Army Permit Part i:General Intormatlon 1. Location: Street Address 58 Os ood Street N. Andover 01845 Lot Number Map 59. Parcel 7 2. Project:Type Residential Description 6 Lot Subdivision of a 5 acre parcel with frontage on Osgood Street in N. Andover MA 01845 3, Registry: County Essex Current Book 1220 .8 Page 3�--- Certificate(it Registered Land) 4. Applicant Flintlock Realty Trust T el.•68b-1313 Address P.O. Box 531 No. Andover MA 01845 5. Property Owner Geor e B. & Wendy W. Stern Tel. Address 58 Osgood Street No. Andover MA 01845 8. Representative Mi. a 1 J. R Tel. 438-6121 DiPrete, Marchionda & Assoc. , Inc. Address 7. Have the Conservation Commission and the 0r=QE Regional Office each been sent,and documents? by ments?certified mail or hand delivery, 2 copies of completed Notice of Intent, with supporting plans Yes Cj No 0 3•1 —1-- S71 . 8. Have all obtainable permits,variances and approvals required by local by-law been obtained? Yes ❑ No Qt Obtained: Applied For: Not Applied For: Building Permit Planning Board Sewer 'Extension 9, Is any portion of the site subject to a Wetlands Restriction Order pursuant to G.L c. 131, §40A dr G.L c. 130, §105? Yes ❑ No 10.List all plans and supporting documents submitted with this Notice of Intent, Identitying Number/Letter 71tle,Date 1 8 1 2" x 11" USGS Cut Out of Site LQcaljs 2 Soil T 3 Hydra 1' 4 Construction Sequences Site Plan 11.Check those resource areas within which work is proposed: (a) ® Buffer zone (b)inland: ❑ 1d: Land Subject to Flooding, a Bordering Vegetated Wettand' © Bordering ® Land Under Water Body&Waterway' ® isolated (c)Coastal: ❑ Land Under the Ocean' © �Designated Port Area' ❑ Coastal Beach, ❑ Coastal Dune ❑ Barrier Beach ❑ Coastal Bank ❑ Rocky Intertidal Shore' ❑ Salt Marsh' ❑ land Under Salt Pond* ❑ Land Containing Shellfish" ❑ Fish Run' •Likely to involve U.S. Army Corps of Engineers concurrent jurisdiction. See General instructions for Completing Notice of Intent. 3.2 -2- 88 Part II:Site Description Indicate which of the following Information has been provtderi (on a plan,in narrative description or calcula- tions)to clearly,completely and accurately describe existing site conditions. Identifying Number/Letter (of plan,narrative or calculations) Natural Features: 2 Sous Vegetation 5 Topography -NA Open water bodies(including ponds and lakes) NA Flowing water bodies(Including streams and rivers)' NA Public and prtvaie surface water and ground water supplies on or within 100 feet of site 2 Maximum annual ground water elevations with dates and location of lest Boundaries of resource areas checked under Part 1,item 11 above Other Man-made Features; 5 Structures(such as buildings,piers,towers and headwalls) 5 Drainage and flood control facilities at the site and immediately off the site,Including culverts and open channels (with Inverts),dams and dikes NA Subsurface sewage disposal systems 5 underground uUllEles 5 Roadways and parfdng areas 5 Property boundaries, easements and rights-of-way 3 Other Hydrological Calculations Part Ili:Worts Description Indicate which of the following Information has been provided(on a plan,In narrative description or calcula- lions)to clearly, completely and accurately describe work proposed within each of the resource areas checked in Part 1,Item 1 1 above. Identifying Number/Letter (of plan, narrative or calculations) P_lanview and Cross Section of: Structures(such as buildings,liters,towers and headwalls) Drainage and flood control facilities,Including culverts and open channels(with Inverts), dams and dikes 5 Subsurface sewage disposal systems d.underground utilities 4 Filling, dredging and excavating,Indicating volume and composition of material 5 Compensatory storage areas,where required in accordance with Part III,Section 10*57 (4)of the regulations Other Point Source Discharge 3 Description of characteristics of discharge from point source(both closed and open channel),when point of discharge falls within resource area checked under Part I,Item 11 above,as supported by standard engineering calculations,data and plans,including but not limited to the following: 3.3 —3— 89 1. delinesticn of the drainage area contributing to the point of discharge; 2. Pro-and post development peak run-off from the drainage area,at the point of discharge,for at least the 10•year and 100-year frequency storm; 3. Pre•and post•development rate of infiltration contributing to the resource area checked under part 1,item 11 above; 4. Estimated water quiiity characteristics of pre-and post-development run-off at the point of discharge. Part IV-Mitigating Measures 1. Clearly,completely and accurately describe,with reference to supporting plans and calculations where' necessary: (a) All measures and designs proposed to meet the performance standards set forth under each re- source area specifled In Part li or Part III of the regulations;or (b) why the presumptions set forth under each resource area spectfted In Part It or Part III of the regula- tions do not apply. C Coastal Resowce Ma Type, tdently9ng rxmber or letter 12 inland isolated Land Subject to Flooding ofsupportdocumemta The project proposes to excavate 3180 S.F. of , isolated vegetative wetlands & alter approximately 5000 S.F. of isolated land subject to flooding. Hay bales will be staked between all disturbed areas & 3 & 4 the edge of isolated vegetative wetlands. The proposed construction will enhance the flood storage capacity of the isolated land subject to flooding. ❑ Coasw Reaourca Am Type: IdentltyN number or letter 0 Intand - of support documents 3.4 90 ❑ Coastal Assourco Area Type; 1denttfyinq nwxniber or Iener ❑ wood or"Pport documents 2. Clearly, completely and accurately describe,with reference to supporting plena and caiculatlm where necessary: (a) all measures and designs to regulate work within the Buffer Zone so as to insure that'satd work does not alter an area specified In Part 1,Section 1 Q.Q2(1)(a)of these regulations;or (b) If work in the Buffer Zone will alter such an area,all measures and designs proposed to meat the performance standards established for the adjacent resource area specified in Part it or Part III of these regulations. ❑ Coaaca!I Resource Area Type Bordered By 100•Foot Dlwetionsry Zone: )danVtyiN rxmber at Iener ®: Inland of support dooxr+ents The project consists of resetting an exist 24" CIP with a 24" RCP pipe. A stone head wall exists at the end of the exist 24" CIP. This will be extended approximately 24". in height to accomadate the fill 4 & S needed to adequately cover the proposed 24" concrete pipe. 3.5 -5- Part V:Additional Information for a Department of the Army Permit 1. COE Application No. 2. (to be provides!by COE) (Name of waterway) 3. Names and addresser of property owners ad(a{rting your property: 4. Document other project altematives(i.e.,other Iocatlons and/or construction methods,particularly those• that would eliminate the discharge of dredged or fill material Into waters or wetlands), 5. a,/am x 1 i w drawings In planview and cross-section,showing the resource area and the proposed actfv tty within the.resource area. Drawings must be to scale and should be clear enough for photocopytnp. Cert€fication is required form the Di✓siort d Water pollution Control.before the Federal permit can be issued. Cerdrathn may be obtained by cctacting the Division cf Water Pollution Contrt7, 1 Writer Street Bosmn. Massacnu efts 0=8. . Where the a6vity will take place Wthn the area under the Massachtw s appmhed Coastal Zone Management prcgram, the applicant certifies that his proposed activity ecrrples Wr h and will be conducted in a manner that •s corustertt wth the appraoed program Information p xyMed will be used in evaluating the application for a per mit and 's mace a matter of pubic record through issuance of a pubic nonce. Dsclosure of this informatr n is voLntary. ho4ever if necessary informaton is not prwided. the application cannot be processed nor can a peirnk be issued. I hereby certify under the pains and penalties of pedury that the foregoing Notice of intent and accompanying plans,documents and supporting data are true and complete,to the best of my knowledge. Signa re of Applicant `� Date L/ t Ignature of Appllcanl's Representative Datet RM "Laceptiea to LNG roan 4346 apytaved IY HQUSACZ- i lray 1li2". FO NEC 7�' 100 (TEST)"Thl, document eoalsink a joint D4partmkas a{ the ArmY sad $late Of Xaatathaset" ypltkttiaa 1 MAY 82 foe a pkrmit Ie ehteia permrretoa to perrarta aetieltiee to Ueitad 31*1 Wagon,The Ofl1a or bteaagemrnt and Budget r0►181 has approved those quektiaaa required ►f tbo US ArwY Cerira or Engtneere. ONG 11u;nb*r 0102.0036 Gad tzpgraltaa date of 30 Septe+abor 111113 applioG••. This ♦tatea+enc wilt be Get is g paint type. 3.6 k -6- DOCUMENT 1 USGS MAP -7- 1132 \ k� 0 .1 Vi lif���, ' ♦ 1 ` ilk 4729 ♦r US ��� ✓� \Up s, ,• € '` ' \l;'�'�i a�0, Q igh, 3. cz .1../ • a y q• 3 ► tit 1 , "�. =i'' �1 , N •" Atki �° co 234 •` � ��;'• '15 r{, r' Sd,h CR EP Ll • '� t Ce h AA • - ' Nor a A•n over13 o_ IL ~ AGE ROAD •p` .\. �I ,A j `\ • 7-. 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TOP OF HOLc DATv i ImEAStlFEMENTS I$ SAMPLES DESCRIPTION OF MATERIALS REMARKS I CONSISTENCY OR !a AND SCALE OEA'TK NWASER OI:PTN DENSITY FIELD TE57 DATA �•� FEET TYPE . O 011- I [ 'Topsoil & Subsoil 24'" 2 4 24" Light Brown till $4'" ,J r fi 6 Hole collapsed to 8411 [dater @ 96" $ Bot om f DIMENSIONS OF TEST PIT —VOL. REPRESENTED ______—....Cu. Ft. BOULDERS: 3%8" Olom I NO.- Val. _ Cu. Ft. WATER TABLE 8 IS" Diary, No. Vol. Cu.Ft. 0EPTH— Ft. Over 18"Diom, No...____.... Vol. Cu.Ft. FIELD ENGINEER i PROTECT Cranberry Lane FILE NO. FOR Flintlock Realty-Trust PAGE OF CONTRACTOR F0REMAN BF DATE 12/20/85 TP N 0. 1 TYPE, OF EXPLORATION Text Pit LOCATION OF EXPLORATION _ Station 5 *25 _.. COORDINATES: N E EL. TOP OF HOLE _—_.__DATUM IMEASuREI.IENTS Id SAMPLES DESCRIPTION OF MATETj REMARKS I rDE'NSITY, SISTENCY oaN ANDSCALE DE,''TN numaEA DEPTn 01- 6R, � FIELD TEST DATA -Z FE£T TY?E Y r 0 I � -12" Topsoil & Subsoil 2 2"-2 ' Sandy Brown Till water @ 27" 4 27"- Light Brown Till 78" 6 ottom of Hole @ 6.5 DIMENSIONS OF TEST PET, _ .- - - -VOL. REPRESENTEO .Cu. Ft. BOULDERS: 3"-8" Diam I No.. Vol.._._.._ . Cu. Ft. WATER TABLE 8"— IS" Diarn, No. � Vol. Cu.Ft. OEPT>•iZ,27 '- Ft. Oyer 18"Diami No. VGI, Cu.Ft. FIELD ENt,INE F-A DOCUMENT 3 HYDROLOGY CALCULATIONS -13- A im"llk DiPRETE, MARCHIONDA JOB & ASSOCIATES, INC. 185 New Boston Street SHEET NO, OF WOBURN, MA 01801 CALCULATED BY DATE (617) 938-1037 CHECKED BY ?P% DATE co BOALE .......... 1- -4 F., .......... PML MMMMA Tj ................. DiPRETE, MARCHIONDA JOB & ASSOCIATES, INC. SHEET NO, OF 185 New Boston Street WOBURN, MA 01801 CALCULATED BY DATE (0 (617) 938.1037 �5 CHECKED BY DATE SCALE ............ ................ ' Lv eoT ............ 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OF 185 New Boston Street lX-�, WOBURN, MA 01801 CALCULATED BY p BATE (617) 938.1037 CHECKED BY `A � DATE_ � � �- SCALE ce 2,IZ G &G Fcrb' r &.c-A, S o.e- U-4 p �Tvi = (15 c)' la v Sloe 2 �dsS . "C'"a-r�1. �.� = . o, "t'1 bL. Uy� t•��'�-� " . "�cx�� �vE, �� � p�o � tilt Of PAVL uo 3 y C-0 t - 3 1� I DIPRETE, MARCHIONDA JOB R J ` & ASSOCIATES, INC. SHEET No. CA OF 185 New Boston Street WOBIJRN, MA 01801 CALCULATED BY r DATE. (617) 938.1037 CHECKED BY DATE SCALE i : TUB L. -lii�:.+� = " . O b-G. ury D Lie N ARC v, o4 es C� ,E.� Gs a1a lsr�� SS �Uv&�. '.r I�yp Ltac�Tl 35v �vC St.npt� 2"/0 - o. '10 . . . : . ; ._ � �T: �.� �►: � Qom, �- E�� 4 r..� �w �. . - srt PAUL 10M t� - ._... . DIPRETE, MARCHIONDA JOB _ &�J'P'- cyt P. .ij & ASSOCIATES, INC. 185 New Boston Street SHEET NO. of WOBURN, MA 01801 CALCULATED BY kjt7)4— -- DATE VNA (617) 938.1037 '� �� CHECKED BY -- DATE- SCALE . . . i....... . ;. j,.., � i 3 f } i f i, ONCE r .,................. I�tfl r coo o p o ov 53o0 0 . 12 D ,tZ igyr, 00 7-0 coo 1 ok 21-� s 0, cog 1 Mtn wl -�fL 't. tro. Nc-t� - 0 5 dc-FT C►p V�� !-�t A wQ-�b2 �E �s.��P = b Z 4 hL F i �1 v� l� '1alf�� �f' �n ©iPRETE, MARCHIONDA Boa & ASSOCIATES, INC. 185 New Boston Street SHEET NO. of WOeURN, MA 080 CALCULATED By �'�} fL••• DATES (617) 938.1037 CHECKED BY DATE.. SCALE i i i - . Uj LEI 15.. f1'T� 2 -UGV .175 W q �U-I I S tAE, ptq �GLC f E "C M�:►�o�� �" � --- �� ��d� c�r. -�. oar'�l ot.,..� k 05 4 �H Of , Mul G reto } Marchianda & Associated Inc . JECT :OSGOOD ST 10YR SHEET:---- OF----- ------------------------ EXISTING SUBCATCHMENT DATA -------------------------- SUBCAT # 1 SUBCAT # 2 AREA= 2.25 ACRES AREA= 4 .5 ACRES CN= 74 CN= 74 . 7 TC= 12 MIN TC= 19 MIN PEAK FLOW= 5. 3 CFS PEAK FLOW= 9 . 2 CFS RAINFALL= 4 . 5 INCHES RAINFALL= 4 .5 INCHES VOL= .33 AC.FT . VOL= .69 AC . FT . SUBCAT # 3 WUSCAT 0 11 AREA= .77 ACRES AREA= 2 ACRES CN= 78.6 CN= 74 . 5 TC= 9 MIN TC= 12 MIN PEAK FLOW= 2. 1, CFS PEAK FLOW= 4 .8 CFS RAINFALL= 4 .5 INCHES RAINFALL= 4 .5 INCHES VOL= . 13 AC .FT. VOL= . 3 AC .FT . SUBCAT 0 12 SUBCAT # 13 AREA= 4 .65 ACRES AREA= .93 ACRES CN= 78. 3 CN= 81 .2 TC= 17 MIN TC= S MIN PEAK FLOW= 11 CFS PEAK FLOW= 2. 8 -CFS RAINFALL= 4 .5 INCHES RAINFALL= 4 .5 INCHES VOL= . 82 AC.FT. VOL= . 19 AC .FT . �IAE�IiIQ A No. 3001 { -22- �i. i i --------------------- EXISTING ROUTING DATA --------------------- -------------------- EXISTING MEMORY DATA -------------------- -- MEMORY I HEMORY2 "•�' �'i 'i�;�' PEAK FLOW= 10 .8 CFS PEAK FLOW= 13 . 3 CFS MEMORY 3 PEAK FLOW= 6.2 CFS NIVA\) --------------------- EXISTING PONDING DATA --------------------- POND # 1 PEAK OUTFLOW= 4 .31 CFS ' MAX, WATER STORED= .24 AC.FT . '1 Y OF PAUL s MuCHH3t4,DA '1 Ha, ' e te , flarch i anda & Associates. Inc . OATE:-----/--- -�---- JECT :OSGOOD ST 10YR SHEET :-__- OF----- STORAGE POND 0 1 DATA ----------------------- TIME INFLOW OUTFLOW ELEVATION STORAGE HR . CFS CFS ACRE-FT. ----------------- 10 .0 0 . 1 0 .0 190 . 1 0 .01 10 . 1 0 .2 0 . 1 190 . 1 a .al 10 .2 0 .2 0 . 1 190 . 1 0 .01 10 . 3 0 .2 0 . 1 190 . 1 0 .01 10 .4 0 .2 0 . 1 190 . 1 0 .01 10 .5 0 .3 0 .2 190 . 1 0 .01 10 . 6 0 .3 0 . 2 190 . 1 0 .01 10 . 7 0 .3 0 .2 190 .2 0 .01 10 . 8 0 .3 0 .2 190 . 2 0 .01 10 . 9 0 . 3 0 .3 . 190 .2 0 .01 11 .0 0 .4 0 .3 190 .2 0 .01 11 . 1 0 . 4 0 .3 190 .2 0 .01 11 .2 0 .4 0 .3 190 .2 0 .02 11 .3 0 . 5 0 .4 190 . 2 0 .02 11 .4 0 . 6 0 .4 190 .3 0 .02 11 .5 0 .7 0 .5 1 ?0 . 3 0 .02 11 . 6 1 .2 0 . 6 190 .3 0 .02 11 . 7 2 . 6 0 .9 190 .5 0 .04 11 .8 6. 1 1 .7 190 .9 0 .08 11 . 9 10 .5 3.3 191 . 7 0 . 13 12 .0 11 . 0 4 . 1 192.2 0 . 19 12 . 1 8 .6 4 .2 192 . 3 0 .23 12. 2 5 .8 4.3 192 .4 0 .24 ., 4 .0 4 . 3 192.4 0 . 24 12. 4 2 .9 4 .3 192 .4 0 .23 . 12 .5 2.4 4 .3 192 .4 0 .21 12 .6 2 .0 4 .2 192.3 0 . 19 - 12 . 7 1 . 7 4 .2 192.2 0 . 17 12.8 1 .4 4 . 1 192.2 0 . 15 12 . 5 1 .3 4 .0 192. 1 0 . 13 13 .0 1 .2 3.7 191 .9 0 . 11 13 . 1 1 . 1 13. 1 191 .'6 0 .09 13 .2 1 .0 2.6 191 .4 0 .08 13.3 0 .9 2.2 191 .2 0 .07 13. 4 0 .9 1 .9 191 .0 0 .06 0 .05 0 .9 1 .7 150 .9 13.6 0 . 8 1 . 5 190 .8 0 .05 13 . 7 0 . 8 1 .3 190 .7 Oi 0 .04 13 .8 0 .7 1 .2 190 . c, t" 0 .04 i ,9 0 .7 1 . i 190 . 6 190 .5 PAOL 0. 14 .0 0 .7 1 .0 MJ�NvaNA Q: a G 14 . 1 0 .7 0 . 9 .5 �. 6.0� 14 .2 0 .7 0 .9 190 .5 14 . 3 0 .6 0 .8 190 . 5 , "� ilS1 :0 3 14 .4 0 .6 0 .G 19 0 . 4 f; ,l 0 .03 14 .5 0 . 6 0 . 7 19 0 .4 Al��, 0 .03 14 .6 0 . 5 0 .7 190 .4 0 .02 14 .7 0 .5 0 .6 190 ,4 0 .02 14.8 0 .5 0 , 6 190 .4 �\��1�,1�� 0 .02 A 1 M 1,� F+ Y 1+/+ M ►.w l+t+ n._ .+ r+ F+ nw' ►+ f.w I+ a.w. 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DATE )JECT : OSGOOD ST S QYR SHEET :____ CtF_____ ----- OUTFLOW HY DROGRAPH FOR PC 1-Z ## 1 ------------------------------- CUBIC FEET PER SECO14D . 0 . 2 0 . 1 , 3 * 0 . 1 . 4 } 0 . 1 . c «t> 0 . 2 0 .2 . 7 * « O . z 0 . 2 . 9 0 . 3 . 0 0 .3 0 . 3 0 . 4 L� 1 , 7 '. y 'ltr:r,:►«�;{:r,«�Fi4«i:++««+«�ii;7:�'+i«i:+tt'fi'*t«?:�k'f7F««�k���:«'t7t'�7k�'k .^�. 4 . 1 4 . 2 .` a;i�:+'�:ri;tk?:+.*'�Y�'fi��i:#+:7'��>���:7:+y:}}:i;y';+,'Yib:�3c�?�'*+.'?:Y�+jk}i►.�t��"}'�x+i:>��;�l:ii'f:')'� . 2 4 . 3 � .,1 r✓ 4 .3 . �. «i:+t.ic�i:ik ;r,}T-'t: :►'YT' i�:'�i+fif 'l�k' '}Si► ki�tst*'"Yt,�: '"!'«?= f:'1: 1T7ctr 4 . 2 4 . 2 r . . 7k#'t+.'+:*i:#'1:#Y.' :'t:# ►f:thy'* «+:Ff"f'fi:tt.i['!:«>; 't?:+.'3:tt+:?'t +tiFt:ik"I�fiY 'ittir«fi1k7:!# 4 . 1 y' «««sF« «+# +i�*«t.«#;trr*tt+wr««++«rr«««4rr««t-:«F««!+«+t.tr«r««««« �4 .0 3.7 3. 1 2. 2 1 . 9 , 5 1 . 7 3 .9 f f««t««««««r r f*4k 1 . 1 0 . 9 Of 4 .5 0 .7 _ � �Mis 4 . 9 f«xrt«ff«« [I . 6 �} t . ........................ • TIS ...... .... .... N cr) 0, ck, 4j 'o -6 Lo o Lo in in to 00 0 . . . . . . . . . .. . lrJ 000000 0 0 0 0 0 CL 0 0 cri ffj 0 m C9 I J I J 0 Cr! CrJ W, , rj CJ N CO C}, C) (n qr 0 4j N W Ol . . co 0', C) N cy) -:T Ln %0 N IT, 0 0 (A Cj 'T Ln 0 N W CK 0 (q 1, . L. . . . . . . . . . . . . tr) %0 N 00, c:, 04 Cri IT If) '0 rl . . . . . . . . . . (C 0, 0, Ol U. 01 : -. -- --- --, -,,. . ". r�: .,: r,: r�- r, r- r,- I- N Cu CO(0 ()J CO W Ol CO OJ i Pre to ! March i onda 64 Associates, Inc . DATE:____/_-�-/---- ZOJECT:OSGOOD ST . 100YR SHEET:---- OF----- -------------------------- EX I ST 114G SUBCATCHMENT DATA -------------------------- i SUBCAT # 1 SUBCAT # 2 ----_----_ -------_-- t° AREA= 2 . 25 ACRES AREA= 4.5 ACRES CN= 74 CN= 74 .7 r TC= 12 MIN TC= 19 MIN PEAK FLOW= 9.7 CFS PEAK FLOW= 16.7 CFS RAINFALL=, 6.5 INCHES RAINFALL= 6.5 INCHES VOL= . 6,1 AC.FT. VOL= 1 .26 AC.FT. SUBCAT # 3 SUBCAT # 11 ~-AREA= . 77 ACRES AREA= 2 ACRES CN= 78 . 6 CN= 74 .5 TC= 5' 11IN TC= 12 MIN PEAK FLOW= 3.7 CFS PEAK FLOW= 8.8 CFS RAINFALL= 6 .5 INCHES RAINFALL= 6.5 INCHES VOL= .23 AC .FT . VOL= .55 AC.FT . SUBCAT # 12 SUBCAT # 13 ' AREA= 4 . 65 ACRES AREA= .93 ACRES CN= 7 G . 3 CN= 81 .2 TC= 17 MIN TC= 5' MIN PEAK FLOW= 19. 3 CFS PEAK FLOW: 4 . 8 CFS RAINFALL= 6 . 5 INCHES RAINFALL= 6. 5 INCHES VOL= 1 . 43 AC. FT . VOL= .3 AC.FT . or Ho, 3C10 i S ,• � `AL i -28- _ EXISTING POUTING DATA ` ----------------------- -------------------- �) EXISTING MEMORY DATA 11 ; --------------------- iEMORY-~1 �'� 4,- " MEMORY- 2 'EAK FLOW= 19.4 CFS PEAK FLOW= 23. 1 CFS ` PEAK FL©W= 9 CFS --------------------- EXISTING PONDING DATA POND ## 1 PEAK OUTFLOW= 5.03 CFS MAX. WATER STORED= .51 AC.FT . =i OF �rxsi,n ; pwL [AARCHIDlli1A �1y � pa. 30015 S FSSIOR L -29- iPre #e . Flarchionda $: Ar.aciate4, Inc . GATE :_---/__- ROiJECT :08600G ST . 100YR SHEET :_--- OF----- STORAGE FOND ## 1 DATA ---------------------- ---------------------------------------------------------------------------- TIME INFLOW OUTFLOW ELEVATION STORAGE HR . CFS GFS ACRE-FT . ---------------------------------------------------------------------------- 10 .0 0 .3 0 .0 190 . 1 0 .01 10 . 1 0 .3 0 . 1 1910 . 1 0 .01 10 .2 0 .3 0 .2 190 . 1 0 . 01 10 .3 0 . 4 0 . 2 190 . 1 0 .01 10 .4 0 .4 0 . 3 190 .2 0 .01 10 .5 0 . 4 0 .3 190 .2 0 .01 10 . 6 0 .5 0 . 3 19'0 .2 0 .02 10 . 7 0 .5 0 . 4 190 . 2 0 .02 10 .8 0 . 6 0 .4 19'0 . 3 0 .02 10.51 0 . 6 Ll 190 . 3 0 .02 11 .0 0 . 6 0 .5 190 . 3 0 .02 11 . 1 0 .7 0 . 5 1510 . 3 0 .02 11 . 2 0 .7 0 . 6 190 . 3 0 .02 11 .3 +.1 . x' 0 .6 190 .4 0 . 02 11 . 4 1 . 1 0 .7 190 . 4 0 .03 11 . 5 1 .3 0 .6 190 .5 0 .03 11 . 6 2. 2 1 . 1 190 .6 0 .04 11 . 7 4 . 5 1 . 6 1510 .9 0 .07 11 .8 10 . 6 3 . 1 191 .6 0 . 13 11 .9 15. 3 4 . 2 192. 3 0 . 24 12.0 19. 3 4 . 5 192.7 0 . 37 12. 1 15. 1 4 .8 193 .0 0 . 45 12 .2 10 . 2 4 .9 193 . 3 0 .50 12.3 6. 9• 5. 0 193. 4 0 .51 12 .4 5.2 5.0 193. 4 0 .51 12.5 4 . 2 5.0 193. 4 0 .51 12.6 3.5 5.0 193 .3 0 .49 12. 7 2 . 9 5.0 193.3 0 . 48 12.8 2. 5 4 . 9 193 .2 0 .46 12.9 2 . 2 4 . 9 193.2 OF�'� C1 . 44 13.0 2 . 1 4 .8 19'3 . 1 �a� 9 0 . 41 13. 1 1 .9 4 . 7 193.0 PaU� u . 39 13. 2 1 . 8 4 .7 192 . 9'-? 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GATE:_-__f JECT :01SGClOD aT . 1 0EJ` R SHEET :---- OF----- OUTFLOW HYDROGRAPH FOR POND 4 1 ------------------------------- CUBIC FEET PER SECOND R C! 0 .0 2 * 0 .2 3 0 . 2 4 f 0 .3 5 0 . 3 0 . 2 . 0 . 4 w# 0 . 4 0 . 5 0 0 . 5 1 t 0 . 5 2 }r 0 . 6 3 * ** 0 . 6 4 }* k * 0 . 7 r its* r ,;r'+.rt.t � ram+ #.srr4 1 .6 3. 1 sr t t:ti r ;� Sri f. w+ 3cr.x� t 7 t#t:i�3f'Fr*ier7i t. ries * 3��rieiE7E#9r 4 .2 [l it s3i►sr.Yid+*}r.333iri« � +} y3 � 9fit:;tic# r }r >} +rii3Ck 7 iEt 4 .5 1 xtr.r x+#.#rfr. #.riri► ri�r' r#. t ry + # it +irxk ?f t.��E rt�Ficxic*#�F 4 .8 yF+.*tiE ##, iEi4r i rw rk+ ?t ?i t*ri►+ r rrt �ririt#t t# >�� � +rEt*+ + t 5 . 0 cj 3r t+fit}7 7E t � +; ► + ;e �i a +>}}t +E ri s f it s « } 7t alr �i i�i i� 7:�k t't ii iR�t;i? i 7.* :k x 5.0 5f+:trf;E#*r �tt *tsai }i} + t�tkfd3 tf �F#+ *ryt*} it#fikiria 5. 0 }, } trt>t:rx +� t }»»} r3rriirtr � � *rr+ � }+ >}* � � * 5.0 ft; +ter' tt i # r' � � t.t# # rx tt.t3�t*ii�t� i+r ttttt:*rs rrfriF 5 . 0 c: »ra t � r' }r#rr>.r ++ > � r k tk� 33e t � tie } � �r+:tit:* is iei 4 .9 y aFxtr:s3� t:* * �E3�i€ 4 .9 0ttrs} try rf� to* + � Y + r *tti� � ti rich# kr: + a �xic* icie3E 4 . 8 1 i� �t+#. � » # frr ?ttf, **� rr r#� �Ftirr�Fr� 3rictk tt� *t#i ih#�EiF 4. 7 r.## } t} } f #r # ***ic 4 . 7 3 4 . 6 a #r. r. rt w+ k } a r t+� �ris� Est}+ +:ii t rt tr is 4.5 ictt'sari« sxtt.� fr:rt:tttf+ #t**i�r3►r#siett# #3 * iii* 4 . 5 E, 4 . 4 r' +#itr*i�#t+ t� #f ; xtr.*rF� r'9f7: ir � s# � ir+rrt3FiE 4 . 4 �� �}����:�t��#y;i��+�t��t:�����.�}�;};�;�+•t��?��i���S��:3t�i;W�•t��:t,�:�3k}�# 4 ,."� z *r #t.# rrr'*t + 3►++f*#dt#f #rsrr} } iEti�s #f �E#. tY+ }sr!Fit 4 .2 4 .2 s�' { OF ir �E +► + # i� tx� � iF *� �F �e �e �# +ttiE 4. 1 y� 1 ' 4fyc\ 410 3 . 5 "� RI II�Ctt OA 4ii} s � 3sak� � r��r �r�i3e�rit3t 2 .9 5 2. 5 2. 1 -32 AL J �' axe 04 �• C) rS U') Al t17 CV) 3c N im LYJ C. OD IM 133 -0 10 `o No NQ -43 -0 ND 0 ---40 " . . . . . . . . . . u In Lo U-) to III II-) Lf)U J U-) LO D) - 0 . . . . . . . . C; 0' C; 000 o ci 0 0 :4C Ar Ac U-) o r, Co ILI, ;T U-j 14C) N , oj (q Lo 4) N 03 0- 04 M cJ- V) '0 N CO CD (4 kl)�T 0 W. C-4 W & . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . oj 03 C. F�, c- C, CK 0, -j,., 1. 14, 'Li -4-. -.43 -fj r,- r-. P- r- ('� CO LO -.0 0) OJ 0) 04 4 I DOCUMENT 4 CONSTRUCTTON SEQUENCES & MTTTGATTNG MEASURES -34- CONSTRUCTION SEQUENCES & MITIGATING MEASURES A. Existing Conditions The site is located on a triangle formed by Massachusetts Avenue , Chickering Road and Andover Street . Osgood Street cuts across a portion of this triangle forming the Town Common . From Osgood Street itself , the proposed Cranberry Lane will be extended . The proposed roadway and subdivision runs westerly and roughly parallel to Old Village Road , another subdivision off of Osgood Street and South of the site . The site at one time was in agriculture as indicated by stone fences along both the northerly and southerly property lines . The land has lain dormant recently and has now been partially reforested . The easterly portion of the site is still in field or field with small shrubs . The back or west end of the site is dominated by a grove of tall white pine trees of up to 20" diameter . Beneath these white pines , along the southernly stone fence there are a few small Balsam Firs which apparently have been planted as they are not indigenous to the site , Between Lots 1 & 2 there is a large mountain laurel clump . At the border of the tree line , (Station 5 + 80+/-) , there is a column of white pines which give away to mixed hardwoods before being again dominated by the white pines . The northerly property line has a row of mixed Oak and Gray Birch which extend east toward Osgood Street . A portion of the field area has a ground cover of cranberries . This area extends into the wetland area as shown on the enclosed plan . The topography of the land is quite flat . There is a drainage divide on the site so approximately the westerly quarter of the site tends to drain towards Chickering Road and the easterly three quarters of the site drains towards Osgood Street and Massachusetts Avenue , In all cases , surface runoff is prevented from entering Osgood Street by a small low ridge of land surrounding the existing farmhouse and barns as 58 Osgood Street ( existing structures on Lot 6) . There is a small area of isolated wetlands which extend in a finger-like projection , easterly and westerly along the northerly border of the site . It appears that this isolated wetland has been caused by the shallow ridge on the easterly portion of the site and the berm which has formed along the northerly property line stone fence . -35- i B . pro 'ect Effects Approximately 750 feet of roadway will be constructed westerly from Osgood Street . Areas within the earthwork limits will be cleared of trees . Trees of suitable diameter will be cut into logs and brought to commercial mills . Brush will be burned if allowed by local codes and ordinances . Otherwise brush will be disposed of by chipping or removal to a suitable landfill . Prior to stumping the roadway , haybales or siltation fences shall be constructed downhill from the toe of embankment and therefore between the proposed roadway and the existing isolated wetland area . Very gentle terrain on the site will inhibit any substantial runoff from the site . Additionally , during construction , proposed catch basins at the low point in the roadway will be utilized as siltation basins to preclude any runoff from getting into the existing wetlands . Also the project involves the excavation of 3180 S .F . of isolated vegetative wetlands . This increased wetland area will be utilized for a storm water detention area . The increased area of the wetlands will be reestablished with indigenous wetland plants . Specifically , this refers to the Cranberry groundcover in the area . The proposed roadway section will include gravel base courses to be extended to the edge of the embankment in fill areas . Additionally , an under-drain system is proposed along the southerly edge of property in areas of cut . These two features compliment each other regarding frost protection and will inhibit potential frost heaves in the roadway pavement . The roadway is designed with very gentle slopes such that in all likelyhood salt should not be required for snow removal in the winter . However , these grades are steep enough to maintain adequate drainage of the roadway surface along with supplemental drainage swales at the roadway shoulders . The roadway has been aligned so the westerly two thirds of the road will be separated from adjacent property by a 20 foot wide buffer strip . This strip is already heavily vegetated and will remain so after construction thereby providing a good natural landscaped screen . All roadway slopes will be loamed' and seeded . The general slopes on the roadway are such that no erosion control stone should be required . All swales formed between the toe of embankment slopes and existing ground can be protected with turf . Runoff from residential areas to the south will flow along the shoulder swale to the proposed catch basin at the low point in the road at approximately Station 3 + 80+/- . Additionally , runoff from the roadway pavement itself will run along the berm formed at the roadway edge by the turf to catch basins placed along the roadway . The majority of this runoff will flow towards the enlarged wetland area . This wetland area will function as a stromwater detention area and also as an area to purify runoff from the site . These are natural functions of wetlands and are incorporated into the design . A small culvert will be installed to drain the low end of the wetlands into the Town ' s drainage system . The increase in the size of the wetlands has been designed to preclude any increase to peak runoff from the design 100 year storm . The wetland area has been designed so that it will not retain water but only detain water. Therefore, there will be no water ponded on site. The wetland areas will function as they do presently. -36- The majority of the existing vegetation on site will remain . The property line between Lots 1 and 2 has been designed so that the mountain laurel bush will be retained . It is in the developer ' s best interest to remove as few of the existing trees as possible in order to make the site more marketable . It is probable that some of the diseased or injured trees on site may be culled out to make the lots more attractive . Of course , trees will be cleared around proposed house lots such that the final appearance of the site will be very similar to the Old Village Road development just to the south . The two developments should compliment themselves . The entire site will be provided with sewers . Therefore , the existing soils and subsurface drainage conditions are not a major factor to site development . However , test pits have been conducted on site . The locations of those test pits are shown on the plan . As per the Highway Surveyor ' s request the drainage from the site will be piped off site to an existing ditch which flows northerly to Stevens Pond behind the homes on the easterly side of Osgood Street . The proposed piping will enter the ditch at an existing stone headwall . An exist 24" CIP drains into the ditch at this headwall . This pipe will be abandoned & replaced by a new 24" pipe . Siltation devices will be placed around the existing headwall & along the banks of the ditch (as shown on the plan ) to prevent any disturbance of the waters flowing in the ditch . C . Resource Areas The existing edge of vegetative wetlands was flagged by I . F .P . Inc . and the flags were located by a field survey . An area along the northerly side of the site was flagged . This area of wetlands is isolated . No streams flow in or out of this area . It appears that surface water collects in this depression and provides the wetness for the wetland ' s plants to grow . The depression , however , may hold 1/4 acre foot of water in an intense rainfall and thereby be subject to the act under isolated land subject to flooding . We have assumed this to be the case as a worst c as e scenario. At the outfall of the reconstructed drainage is a well defined stream . The banks of the stream are approximately 2 ' -4 ' in height . An existing stone headwall with a 24" CTP exists at the banking of this stream . The project constists of constructing a 750 ' roadway to service 5 additional lots . Regrading for the lots will occur up to 5 ' from the isolated vegetative wetland edge . Although this wetland is not a boardering vegetative wetland , the project proposes no filling of the isolated wetland area . A double row of Haybales will be placed along the edge of wetlands to prevent siltation into this area from exposed surfaces . For the purposes of not increasing the peak rate of runoff from the site , a portion of this isolated wetland (3180 S . F. ) will be excavated . Once excavated the area will be revegetated . This excavation will enhance the flood capacity of the depression & will increase the size of the wetland . The project also involves the replacement of an existing 24" drain line at an existing headwall at the bank of a stream flowing to Stevens Pond . The headwall will be extended in height and fill placed up against it . Staked hay bales are proposed at the top of the banks of the stream and around the headwall to prevent any siltation from entering the stream . A . Construction Sequencing 1 ) Prior to clearing the site hay bales shall be staked along the edge of wetlands in the rear of the proposed lots and along the existing stream behind Osgood Street as shown on the plan provided . 2 ) Grubbing and stripping of topsoil may commence after installation of the erosion control features . Stumps shall be removed and deposited in the area shown on plan provided . Topsoil shall be stock piled and reused in final grading operations . All topsoil shall be utilized , on site', unless approvals are obtained for removal in accordance with the Zoning By-Law . 3) The closed drainage system shall be constructed . This work shall include the off site drainage system . New catch basins shall be constructed to function as sedimentation traps until gravel base courses are laid . 4 ) The drainage detennion area shall be constructed as detailed on the drawings . The topsoil removed in the construction of the detension area shall be respread over the excavated areas . 5) The subgrade shall be fine graded and base courses laid including bituminous base . 6) Embankment & fill slopes shall be fine graded , and backfilled with loam from stockpiled sources . 7) Permanent seeding and mulching shall be established prior to final paving . -38-