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HomeMy WebLinkAbout07-31-1987 Drainage Calculations 1 , F Richard F. Kaminsa & Associates, Inc. Drainage Calculations Breckenridge Homes North Andover , MA - July 17 , 1987 Architects © Engineers ❑ Surveyors ❑ Land !Tanners 200 Sutton St., North Andover, MA 01845, (617) 687-1483 " -� U, 5..-Dept, of ,�gryculture iia-F,mo-21 ,� ; 6011servation Service 3- ,jO TIME OF CONC5TRATION ti site (�r2��Ct� �c�� +� t 5 Check ad Date Date - -�"7 -��-87 S ��• i jR DIST910E DTFF. IN ELEG. SLO?'E VELOCITY � ) E 'TYPE OF FLOW (�) , (FT. ) (FT. ) :< IOG (FPS) (2) - -7T �i 2 �fo 3 3�50, CC) 1 �f4- A 44' 00, 6,640 TOTAL TIIeiE (SEC. ) T7iAL TTi,! i `FC• Te 3� C� FI s. est tenth of an hour. Note: Round off total. to the near o ���C�ti•'L'`k�, ;j�1)�.0 'C1"��F''.c..-J �f�"� r � Cam.} CURVE 11UMBER Area col . 4 Hydrologic Conditions Impervious Runoff x Land use and Ny Area Curve (a�) Hydro. Col . 5 Sail (ac or Number 5 6 4 Group 2 3 r �aQ F::"5 a� �r /3 4 I I i j-I ,/o i l Totals use G;I Col 6 Y ---� ��.. weighted Runoff Curve No. (CtO � Co^�l. in RUMOFF DEPTHFrom Table 2-1 , pg. 2-3) U. S. t. of rzcuiture Kk-•E)110-21 �' 3-•10 5;)i-1 conservation Service TIME OF CONCENTRATION ti Site J /�•�: -� i Date 7-.'!- rJ Checkod Date DY r 4 � R DISTANCE DIFF. IN ELEV. SLOPE VELOCITY TIME E TYPE OF FLUW W (S ) f , (FT. ) ( T. ) (�. log (FPS) ( , 2 QKUftt, 5 YA'4 • VAra • � i 8 9 TOTAL TIME (SEC. ) Tc = TOTAL TIME (SEC. - 3000 3bo0 xRs. Note: Round off total to the nearest tenth of an hour. r r U. S. u�pt. of Agryculture ? ifA--ENCT-21 3_70 9.;,;1. Cot�serva.tian Service TIME OF CONCENTRATION Site c7:) COIJZ��. E E Date 7^17— V Checkad G DateBY I i r" (1 2 3 � iR DISTANCE RIFF. IN ELEV. SLOPE VELOCITY TIME . E TYPE OF FLAW (�°) A (FT. ) (FT. ) (L) x 100 (FPS) c 1 Z,17 l� a,-7 S Ott T f 1. 4 r 9 TOTAL TIME (SEC. ) Tc TOTAL Tlid E (SEC. = u 3r 0 36©0 qRS. st tenth of an hour, Note: Round off total to the neare CURVE JIUMBFR Hydrologic Conditions Impervious Runoff Area Col X ; Hydra. Land Use and Hy Area Carve (ac) Soil (ac or Number Col . 5 3 4 5 Group , . & 4a- //�ii1 i i 13 Totals Col . 6 , �� r� use -- CH Weighted Runoff Curve N . (Cr{} Caj.� inch RUNOFF DEPTH (From Table 2-1 , pg. 2-3) :_- RICHARD F. KAMINSKI & �30CIATES, INC. ARCHITECTS ENGINI ERS SURVEYORS ' LAND PLANNERS JOB NO, ____------- SHEET �2-0E—� 1Of11 CALC. _�/`�.��_— DATE ---•-----•--- �i_ CNfCD._S _-_ — —__ DATE ------------- i i E�'�s7"/h/G Cch/,Us e9PG�t = 2, 13 Ac.C-E:w Sa/L CN = .57 jirsir.2r✓luvS yT44L AeEA _ �, C�'C 5 ,• Q/are 13 C/V 1/ 74 /V / 1/ Ac cf1V .`7 RICHARD F. KAMINSKI & ASSOCIATES, INC. ARCHITECTS ENGINEERS SURVEYORS LAND PLANNERS 7 JOB NO. --___------ SHEET--1-_..OE_-:L- DATE PROJECT--- SUBJECT- --------------- --- CHKD._- .T --_ DATE %a TAG �LJit14%% G✓�r/� /✓o ts 7D711L .�'U�EJaf F G+l/Tf� / T/JTIo!✓ C+�� 2. S i i p6 E I i i a Statement of Environmental. Impact i For Breckenridge Subdivision North Andover , Massachusetts July 31 , 1987 1 Richard F. Kaminski & Associates , Inc . 200 Sutton Street North Andover , Massachusetts RICI-IARD F KAMINSKI AND ASSOCIATES , INC . 1 ENGINEERS R ARCHITECTS + LAND PLANNERS • SURVEYORS 1 NORTH ANDOVER , MASS. 01845 N TELEPHONE 687 1483 JKI 7ft B o t4,Fi- _._y ;tit aas='� t° '• r • n I _ am I 179 � �• o , 148 FOREST i LOCUS PLAN U . S .G . S . QUADRANGLE MAP ) SCALE : I" = 2000 FT. N 1 B Z O N E R 2 �-- w co S IT w CD W W /�, J T J U7 LO ' CUS PLAN � C i ` I � II / I i I . Introduction Breckenridge Homes is a land site consisting of approximately 3 •6 acres . The parcel is located on the west side of Gray Street , North Andover . 3 i It is the intention of the proponent to develop this parcel to a 3 lot residential subdivision . The parcel is located in an area of North Andover which is zoned by the community as Residence 2 , which allows for a single family dwelling on an acre . It has been classified as an Open Space District . An Open Space District would allow detached houses on lots of one acre or more . There are no deviations from this land use plan in the general vicinity . All of the usual residential utilities are presently available to the locus , excepting public sewerage . It is proposed that sewage be disposed of by sub-surface disposal systems . 1 . Water 2. Electric 3 . Garbage and trash disposal 4 . Drainage Telephone The Breckenridge Homes locus is primarily rural , rolling and wooded . The surface of the land has been cleared - of stone and at one time was farmed . Thera are scattered groups of apple trees . The topography of the parcel is` very regular , sloping smoothly down to Gray Street . A small wetland is located on the southeast portion of the parcel . The runoff flows from this wetland by way of an existing culvert under Gray and Boston Streets and into Harold Parker State Forest . EcologicQal Characteristics The vegetation over the locus is of two types : an open field of approximately one half an acre surrounded by a stand of mature white pines . The open field is reverted to the old field condition . The juxtaposition of the two vegetation types provide a favorable wildlife habitat . With the development of the homes and associated yards , the wild field condition will be replaced by equally valuable yard landscaping . However , it is impossible to replace the mature pines . Every precaution should be made to protect the mature pines whose removal is not required for construction . With the construction of the subdivision and homes approximately 60% of the site will be altered . No alteration will occur in the wetland area . Soil Analysis The soil information was obtained from data compiled in the report submitted to the Town of North Andover by the United States Soil Conservation Service . The soils are classified as Canton , very stoney , fine sandy loam having 3-8 percent slopes . It is deep , moderately sloping and the well drained soil is in irregularly shaped areas on the lower slopes of hills . The areas range from 10 to 100- acres . Slopes are smooth, rolling , and 50 to 600 feet long . The surface is covered by stones 1 to 3 feet in diameter that are 30 to 100 feet apart . The permeability is moderately rapid in the subsoil and rapid in the substratum. Available water capacity is moderate . A few areas of the soil are farmed and are mainly used for pasture . Many areas are wooded , and many are in urban and residential. development . There are no limiting features which would prevent its development in the manner proposed . BUILDING SITE DEVELOPMENT Soil name Shallow Dwellings Dwellings Small Local Roads Lawns and & Map Symbol Excavations Without with Commercial and Streets Landscaping Basements Basements Buildings CbC Severe Moderate Moderate Moderate Moderate Moderate Cutbanks Large Stones Large Slope Large Stones Large Stones Caves Stones Large Stones Six deep test pits and six. percolation tests were observed on- site . The ground water levels were at or greater than 7 . 5 feet . The percolation rates ranged from 5 min/in . to 12 min/in . The tests were witnessed and are on file at the Board of Health office. Popu a# ion Increase The most common method used to estimate the total population and the number of school age children in a given development is to apply "total household size" and Itschool age children" multipliers to the number of housing units of various types to be included in the development . Typically , the size of these multipliers depends upon the type of dwelling and the number of bedrooms provided in each unit . e The expected population increase and the school age distribution � is summarized below: Dwelling Tyt)e Mult"ers I Total Population Pupil i 3 Four bedroom 3 .720 Kindergarten . 152 single family Grade School .969 homes High School . 17.2 1 .293 Expected Population Increas E n Individuals School Aye Children E 11 Kindergarten 0 Grade School 3 High School —1 Total Student Increase 4 In summary , it is expected that there will be 11 residents of which 4 will be school age children . Impact of Population GGrolt The analysis of the impact of the expected population increase upon the community services is based upon the expected condition , that there will be 11 -residents in the development . I. Public Water Supply Public water is available to the locus via an existing 6" pipe in Gray Street . It is the intention to continue this water main as an 611 pipe into the site . All of the developed lots will have public water service . Water consumption resulting from the development of Breckenridge Homes is estimated to be 880 gallons per day (80 gal/day x 11 ) . This quantity will not significantly affect the public water supply in the Town of North Andover . In order to provide for fire protection , a hydrant will be installed at the end of the proposed right of way . 11 . Sewage Disposal Municipal sewerage is not available to the site . It is proposed to dispose of waste by means of sub-surface disposal systems . Soil testing has been completed and show that the soils are acceptable for septic system disposal . III Solid_Waste The 3 dwellings of Breckenridge Homes Subdivision will generate an estimated 5 .7 tons of solid waste per year ( .52 tons per person per year x 11 persons) . No solid waste other than that generated by the residential occupants is expected as a result of this development . IV . Traffi-c The total daily traffic is expected to be in the order of trip--ins per average weekday . The enclosed table shows both the average weekday vehicle trip--ins and their time distribution . E SUMMARY OF TRIP GENERATION RATES i North Andover Base 7e ac'ned Housi'i91T E L2nd Use Code 210 Land Use/Building- Type 5 — — independent Variabie--T rips per ewe' t i n= Unit Average Orchard Path Estates Trio Trips/3 Units RE re Average Weekday Vehicle Trip ands 12 36 F7aa}< A.M. Enter i 1 Hour I exit 2 of Total I n 7n' 2 Adjacent P.M. Enter Ein 2 Street Between exit , j7 1 Traffic 4 and 6 + Total I 1 . 00 3 Peak A.M. I Enter 0 , 21 1 Hour Exit 0 . 7=; 2 of T offal I0 7 2 Generator P.M. Enter 2 Exit ? I Total o 3 Saturday Vehicle Trip Ends 12;1 36 Peak I Enter n c�n 2 Sour of Exit j L!r 1 Generator Total n oA 3 Sunday Vehicle Trip Ends 10.4 31 Peak Enter Hour of Exit n i,� 1 Generator Total �, �� 3 V I the quality of the air will not be significantly affected by the development of the 3 dwellings The traffic and domestic noises resulting from the development of these residents will increase the noise level of the neighborhood . However , the level of the noise , between 40-50 decibels , and its kind are not considered to be a negative factor in this land use area . However , - there are several aspects of the proposed development which are designed to minimize the effect of the noise on the residents and the neighbors . a . The development is small . b. Existing vegetation will buffer the adjoining residential properties . c . Supplementary planting will be added to diffuse and absorb sound . Erosion control 2 days Clearing and grubbing 1 week Detention basin construction 1 week Roadway & drive excavation 1 week Drainage installation 1-2 weeks utility installation installation 1 week Roadway & drive gravel base 2 days Binder course Finish course 1 day Loaming ,, grading & seeding 1 week JBC1724