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HomeMy WebLinkAboutMiscellaneous - 35 HOLLY RIDGE ROAD 4/30/2018 (3)0 cs LF-. Town of North Andover OFFICE OF `COMMUNITY DEVELOPMENT AND SERVICES 146 Main Street North Andover, Massachusetts 01845 March 8, 1996 Carter and Coleman, Attorneys at Law 451 Andover Street, Suite 195 North Andover, MA 01845 ATTN: Mr. Robert Wyman RE: Floodplain/Runoff Issues at #35 Holly Ridge Road. Dear Mr. Wyman: The North Andover Conservation Department is in receipt of your correspondence dated February 19, 1996. I am writing on behalf of the Department of Public Works (DPW) and Planning & Community Development Departments respectively. to It a i �`� • On Wednesday February 28, 1996, Mr. Bill Hmurciak, from the Department of Public Works, and myself performed a site inspection at the above referenced property. In addition, a historical review of all relevant files and/or permits issued for the development was conducted. We inspected the existing catch basin system, detention pond(s), present flow rates and/or volumes as well as a review of all wetland resource areas on-site (enclosed please find Attachment 1 which outlines the technical aspects associated with on-site drainage and runoff). It is the opinion of Planning and Community Development and DPW that the Town is not responsible for the flooding problems at 935 Holly Ridge Road as described in your letter; we have made this recommendation to the Town Manager. I would encourage you to consult with a qualified Wetland Biologist and/or Professional Engineer and look into the issues raised in Attachment 1. I would also suggest that you obtain a plot plan certified by a Professional Engineer which would depict the limit of floodplain on the property; it is my understanding that .this plan is required when the title is transferred. I am willing to schedule Mr. and Mrs. Beck on a future NACC agenda for discussion purposes should you seek further guidance. A public forum facilitates the permit process and would allow your client the opportunity to hear input from Conservation Commission members prior to expending additional funds. If I can be of further assistance or if clarification•is warranted please do not hesitate to contact myself or other applicable town personnel. If you should decide to seek professional consultation from a Wetland's Biologist, I will make myself available to visit the site and study it in detail in conjunction with him/her and approach the NACC with possible remedies. BOARD OF APPEALS 688-9541 BUILDING 688-9545 CONSERVATION 688-9530 HEALTH 688-9540 PLANNING 688-9535 Sincerely, Michael D. Howard Natural Resource/Land Use Planner encl. CC: NACC Mr. Robert Halpin, Town Manager Kathleen Colwell, Town Planner Bill Hmurciak, DPW file ATTACHMENT 1 SITE INSPECTION AND WETLAND RESOURCE AREA EVALUATION (#35 HOLLY RIDGE ROAD) Dated March 8, 1996 North Andover Conservation Department The Wetlands Protection Act (310 CMR 10.00) and the North Andover Wetland ByLaw (Ch. 178 of the Code of North Andover). Work, as outlined under 310 CMR 10. 04, proposed within 100' of a wetland resource area as defined under the Massachusetts Wetland Protection Act and the North Andover Wetland ByLaw is subject to review by the North Andover Conservation Commission (NACC). Wetland resource areas identified on-site at the time of inspection were as follows: • Bordering Vegetated Wetland (310 CMR 10.55))- • 0.55);• Bank (310 CMR 10.54); • Bordering Land Subject to Flooding (310 CMR 10.57). Work proposed within a resource area as defined herein requires the filing of a Notice of Intent (NOI) with the NACC and the issuance of an Order of Conditions permitting the proposed activity. The North Andover Wetland ByLaw has a defined twenty-five foot (25') No - Disturbance Zone and a fifty foot (50') No -Construction Zone from the limit of wetland resource areas. It is the opinion of the Conservation Department that work has occurred on the property and within the -limits of the above referenced wetland resource areas without a valid Order of Conditions from the NACC. This is a violation of the Massachusetts Wetland Protection Act and North Andover Wetland ByLaw. The regulations specify a variety of activities that alter wetland resource areas. They -=may -include- routing storniwater away from a protected intermittent stream, causing flows to -run through a channel rather than to diffuse- gradually through the surface ofia 11 vegetated wetland,- channeling a stream, installing a dam or -detention' structure or re-routing flows. Work, in this case, may be defined as follows: • an unknown linear feet of Bank was altered for the purposes of installing a set, fieldstone wall ,and associated PVC drain; • an unknown square footage of BVW buffer zone was altered for the purposes of installing a grass swale to channel runoff from the house-, • an earthen embankment has-been created channeling flow from the outlet of the catch -basin pipe which discharges into a tributary and prior to reaching Mosquito Brook. . I am not issuing a violation notice and/or fine(s) at this time, however, please inform the . homeowner that future work within a wetland resource area, as defined under the Act or ByLaw, will not be tolerated without an Order of Conditions from the NACC. As stated, work within the Buffer Zone which may effect adjacent wetland resource areas is also subject to NACC review. Detention Basins: Culverts or storm drains carry runoff from catch basins. They may discharge into retention basins, which hold stormwater on the site and discharge it gradually into the ground; detention basins, which slow down the flow of runoff but eventually allow it to discharge to streams leaving the site; or directly into ditches, swales, streams, ponds or vegetated wetlands. Detention C:/My Document/Correspondence 5 12:35 PM3/8/96 and retention basins and vegetated swales also contribute to settling out of sediments and removal of suspended and dissolved pollutants from runoff. Ideally, stormwater management systems should minimize changes in volumes and rates of runoff flow onto and off a site as a result of project construction. In reality, such systems are designed for only certain storm conditions; under other storm conditions flow rates and volumes may change. Similarly, detention/retention basins should be designed in such a way as to maximize the settling out of suspended sediments and the uptake of dissolved nutrients and other chemicals by plant and soils. Drainage on the North Andover Estates/Heights development is being routed towards two (2) control points, a detention basin located at the corner of Chestnut Street and Rosemont Drive (Basin #1) and a second detention basin located at "the corner of Wild Rose Drive and Holly Ridge Road (Basin #2). a) Detention Basin #1: An as -built plan entitled "Detention Pond As -Built Plan", dated April 5, 1995 prepared by Land Planning Engineering and Survey, and an analysis to determine current detention pond status, in letter form dated May 11, 1995 also prepared by Land Planning has been previously submitted to the NACC for review. Land Planning has included in their analysis corrective measures proposed to restore the detention pond's abilities to function as designed; the NACC approved this proposal at a public hearing on June 21, 1995. The report states that "Detention Pond #1, although constructed somewhat smaller and at different elevations than designed will function properly for it's intended use with no adverse effects on downstream areas. The only change necessary is to lower the catch basin grate elevation of the overflow structure approximately 2' to elevation 255.5. This will allow the overflow structure to function properly if needed." This corrective measure is scheduled to take place this summer when conditions allow. b) Detention Basin 92: Presently, Detention Pond #2 is not dumping out entirely between storm events. A "riser pipe" detains water thus allowing sediment and silt to settle out prior to discharge into the vegetated wetland which borders on Mosquito Brook. Upon completion of construction the ponds are designed to drain completely between storm events. The detention pond as constructed provides adequate storage for a typical storm in the magnitude of a 10 or 15 year event, however, the storage volume as constructed is inadequate for the 100 year storm. It is therefore necessary to reconstruct portions of the detention pond as described in the approved re -construction plan. Compensatory wetland replication is also scheduled to take place at the terminus of Wild Rose Drive in conjunction with the detention pond re -construction. This additional wetland creation will facilitate runoff and improve water quality prior to discharge C:/My Document/Correspondence 6 12:36 PM3/8/96 into Mosquito Brook. Work will be initiated during the summer months of 1996 when conditions allow. NACC Issues: Hydrology - This Department is willing to work with Mr. and Mrs. Beck and the other Town Departments mentioned herein in resolving this matter. However, the sensitive nature of the surrounding wetland resource area hampers the decision making process. Simply re-routing the storm drain pipe as you suggested in your letter is not, in my opinion a viable option. Diverting the hydrology and removing this "driving force" from the wetland resource area is a permanent alteration; this is not a permitted activity under the Act. The role of other hydrologic inputs and outputs would have to be studied in detail prior to making a determination. Historical correspondence indicates a high -.water. table (top -12")tin-the-immedi-ate!a-rea and it's role also requires further evaluation. Typically, when the water table is at onnear- -the surface; the soil acts like an imperin able surface -and runoff is increased. The boundary of Bordering Land Subject to Flooding_(BLSF) is an elevation representing the level to which floodwaters rise during a 100 year flood. A 100 year flood does not mean a flood that occurs only once every 100 years. Rather the term refers to the magnitude of flooding that has a 1% probability of happening in a given year, based on historical records. For most major water bodies, the 100 year flood elevation has been determined by the National Flood Insurance Rate Program administered by the Federal Emergency Management Agency (FEMA). It is important to remember that every water body, no matter how small, is likely to have BLSF associated with it. FEMA-maps-indicate-anexisting-floodplain•af 935-H611y-Ridge-Road incthe range-of-207-21Q:NGVD-(please-refer-to-the-enclosed:map). Work _within this--resou-rce-area may not =impair-the:ability-of the_.surrounding;landscape -to contain volumes _reaching,this range. I have enclosed "As -Built" and "Pre -Construction" plans of Lot 3 for your review. A benchmark other than NGVD, which FEMA utilizes, is depicted thus making it difficult to determine the limit of floodplain on the property. I would suggest that a topographic - survey -of:the-property be perform- ed -with- spot •elevations in order_to accurately-det_ermine jurisdictional limits. An-unknown-squarefootage-of-Bordering; Vegetated:Wetland BVW) was filled -for -the purposes bf.constructing=Lot 3--and-Holly RidgeRoad under -DEP #242-348 *,LT -he -home;- as -it -presently ,exists; was built-in_close-pr-oxinuty-and:potentially.-within-the floodplain-and:within-the-limits -of a vegetated=wetland. This fact coupled with a high groundwater table and the position of the house at the bottom of a hill would -result - in- potential -flooding �regardless--of the -factors described in your correspondence. Furthermore, it appears as if<house-construction-was modified-substant-i-Vy by the builder from the original submittal andfre=constructirig the—gai-age-under the-hougerathec-than cas=ari-attached-unit=may have-intercepttted=withthe=g'roundwater. I have enclosed correspondence pertaining to the modification request and a copy of the Certificate of Compliance for your review. C:/My DocumendCorrespondence 7 12:35 PM3/8/96 Summary: This Department is concerned about changes in hydrology. Hydrologic changes may result in changes of plant species in wetland resource areas and can cause conversion of wetland areas to upland and vice versa. Alterations in stream flows may affect pollution control, fisheries and wildlife habitat, and flood control. Ideally, projects that involve substantial changes in the land surface (i.e. Deerfield Subdivision, North Andover Estates) should be designed to maintain existing drainage flows and volumes within the drainage basins on a site. Review of the approved subdivision plans indicate that the outlet structures in question were constructed and placed accordingly and in compliance with the rules and regulations at that time. C:/My Document/Correspondence 8 12:35 PM3/8/96 CHRISTIANSEN & SERGI, INC. Professional Engineers and Land Surveyors 160 SUMMER STREET HJVERHILL, MASSACHUSETTS 0183C (508) 373-0310 December 28, 1982 North Andover Conservation Commission 120 Main Street North Andover, MA 01845 Re: Lot 3, Holly Ridge DEGE File #242-348 Dear Commission Members: On behalf of my clients, Coolidge Realty Trust, I would like to request a modification of the Order of Conditions for Holly Ridge for proposed changes on Lot 3. Enclosed is a site plan showing the proposed house, driveway, and grading. The house is slightly larger and of a different shape than the one originally proposed and the driveway is on the opposite side of the house. Very t 1 Yours L Phi i G. Christiansen i PGC/ks Enclosure Aisling Construction Co., Inc. Complete Construction and Design Services Mr. Richard Doucette 112191 Conservation Commision Town of North Andover Dear Richard, This letter serves as a formal request to modify the plans submitted for Lots 3,5,7 Holly Ridge Rd. My intention is to attach-decksTto-be_constructed-on:soonet tubes -to -the existing houses currently— constructed within -the footprints previously approved. These decks as shown on attached plans will not encroach into the no cut zone or the building set back limits. Additionally, own -10- t-3=l=have.constructed-a smaller home (56228) within the previously approved footprint (82'x30) however, it is necessary to load the garage�under from the opposite side- and- as -such -a modifcationis requested-for:the driveway. Thank you, lC.i G� Patrick K. Murphy President 800 Osgood St. • North Andover, Massachusetts 01845 • (508) 689-9446 CES- t �t �O �OC� U C7�►Tt o >til �, A �J 121 (IT �2( 18(41 p S c a. -r -r l.._ . C-� � L•� � e.. C_.. S . u 1=> o.. Np t o f Lor 4- Z2Z Sq D� L. y z I oGc L- <=b -r- 2 44Z.00 S 2TtT=y THPfT' o F=-FSIE=--r-n> !E> +-4 THE, oft= SQ.Ts U'�E', 05=' T�-FE, gUiL.p�V,S ZuSPEGTbQ S H a �! ti.l Go1•n Pt�7/ O U �--�Y A U S � tK_ H VSE. \ S �o i�� `a.l f -r a'� L-G>`�.(S o >✓ C..o �.1 F� a 2 !-� lT y dTZ ►�..1 0 ►...1 C.o �J F02,r�1- �O ki 41 qeL-A” 'a CU t t--= H LAOS to (21 (4( 5 1, -L7 -A i ION *+ FEN c E I t4- Z BACKEu ►3Y +�`+ v t HAY BALE 5 • � XxXxx�xX�CXxxxx xx�C>ck �'N 96 t ', t l000 PROP. HOUSE __ -77_ T-0 FNS. = iD4 OT /00 ' Boz 304' X00 ,, L= 140.Oo app I 1 I /00 SM H HOLLY 4f n,., I d " " / 310 CMR 10.99 Form 8 Commonwealth of Massachusetts Lot 3 Holly Ridge Road . Certificate of Compliance Massachusetts Wetlands Protection Act, C.L. c. DSP File No. Cily Town 242-34-8 rio De woviaed by DEP) North Andover 210- ADaucanl Coolidge Realty Trust 131, §40 North Andover Conservation Commission ISsumn Authority From Aisling Construction Co., Inc. ' To Pat Murphy � 800 Osgood St N. Andover, MA 01845 (Address) (Name) Date of Issuance January 6, 1992 �} This Certificate is issued for work regulated by an Order of Conditions issued to Cna1 ; dgp Poi t -y -Tract dated 6/20/86 and issued by the NACC 1 . Q It is hereby certified that the work regulated by the above -referenced Order of Conditions has been satisfactorily completed. 2. A2XX It is hereby certified that only the following portions of the work regulated by the above- refer-enced Order of Conditions have been satisfactorily completed: (If the Certificate of Compliance does not include the entire project, specify what portions are included.) to rn CD Lot 3 ONLY. x ?D O W ?:Q 3. Q It is hereby certified that the work regulated by the above -referenced Order of Conditions was N never commenced. The Order of Conditions has lapsed and is therefore no longer valid. No fuiure � p. tent a work subject to reaulation under the Act may be commen I and receiving a new Order of Conditions. nr N n� w� .............................................. .... o........ (Leave Soace 9!ank) i O \ w ! W L ( w s z C)LLJ n ` v — w 3 CD 41 C— r L.Aw Offices of Ariere M. Keating :quite 83 -- Chestnut Green 565 Turnpike Street North Andover, MA 01845 4. ®K This certificate shall be recorded in the Registry of Deeds or the Land Court for the district in which the land is located. The Order was originally recorded on 10/31/86 (date) at the Registryof � F=gpY Mrirtn . Book 2343 Page 267 Ins. #36704. 5. [] The following conditions of the Order shall continue: (Set forth any conditions contained in the +. Final Order, such as maintenance or monitoring, which are to continue for a longer period.) issued by North Andover Conservation Commission Signatures} - When issued by the Conservation Commision this Certificate must be signed by a majority of is members. (fin this day of �' N/,//� -� _. 19 before me personally appeare to me known to be the V r person described in and who executed the foregoing instrument and acknowledged that heishe executed the same as his/her free act and deed. Aot Public ,4,4 My commission a ires Detach on dotted line and submit to the North Andover Conservation Commission .......« ....................................... NACC Issuing Authoni To Hol' y�E .i citrP Rnad Please be advised that the Certificate of Compiiance tar the prolect at: Lot 242— 348 Deeds, Northern Essex File Number has been recorded at the Registry at and has been noteo in the chain of title of the affected aroceny on it reccroec ianc.:ne instrument numoer %vnrcn toentdles T:iIs transac*tor, is 00 D O A X r - m cr LA 2 00 %n m o, GE�,'i" l p-1 �� �c�usJ G"�'�T►t� i..�t �A i.J Loc.A-t"Et� 1 U f`lo>zi N Ry ]�o•/�(L; 11LA 12� {8(41 � otZT 4-1 A �•..� fl o v E.2 � r!C A SS • Np 1 0 f � i N F- 00 / lV i 7� dt L- ,. a s o -t- Z. v0 Ic E ap ki S �y .:21992 NACC Gca— Q. -r -t;'-/ THAT o F'FSE�TS SIa..� ►�J A2,�,.ot� TIE, TFdE� c�.F'FS�TS USE oF' Tt-t�..B-U �L:.bt►.16 ZuSPEcit�� o� \-1 o k.! ►..1 C�oM P(._y O t.1 COY A �..a C� S c.�C. H VSE l S �0 2� `t! Cr ►-► T 4 ! E. Z!J►.l INJG�E.T E.2 til u AT t"o t._i p F" '� o t.1 ti G Sy L+Avt.l S o F Cro �...1 F" otL !� tT'?� o1Z ►`}, o � Co ►.� Fo2,t✓l- �O. Au �VE2_.f�fA, ►T"� �.�1 H E. � Go �. S'1"2.uGTE.D. , ml 10 f21 (4( 12 (8(4( WHI1LE Y0U:WEFlE AWA�Y FOR DATE TIME � A.M. 3' �T 1 M 3,5 1-10 /j G, o, PHQNECl . OF lej J 4al FAX ❑ MOBILE L ! �- Q PHONE � D L �c� �� � �� ��T�„I CALL YOUR„CALL AREA CODE NUMBER f EXTENSION - C PLEASE CALL MESSAGE Loerkki it % ��, me �T6 YUILL CALL top �TO j /, S b+C fitli9/?�PG� r0 r4 ZK 7-0 !Zoo, WMTS TQ SEE YOU SIGNED L_�)L✓ _ &PS. FORM 4002 NOTES FORM U'- LOT RELEASE FORM VU INSTRUCTIONS: This form is used to verify that all necessary, approvals/permits fry Boards and Departments having jurisdiction have been obtained. This does not relie the applicant and/or landowner from compliance with any applicable or requirements. -----"`—°"`°°wwww"APPLICANT FILLS OUT THIS.SECTION APPLICANT �%►�: i D i Avg G�S PHONE g' - 7513 LOCATION: Assessor's Map Number PARLEL SUBDIVISION LOT (S) STREET ,35 Holl F)'Jae Ro6d ST. NUMBER_ 35 OF TOWN AGENTS: CONSERVATION ADMIN1�fRATOR DATE APPROVED �� DATE REJECTED_ s COMMENTS—4d i jG� �..: �,`v�� vv>�{ i3 ►pf t -s Rxr TOWN PLANNER DATE APPROVED DATE: REJECTED COMMENTS FOOD INSPECTOR -HEALTH DATE ,01"R610ED DOTE REJECTED SEPTIC INSPECTOR -HEALTH -DATE Ap.PROVD. DATE -REJECTED COMMENTS PUBLIC WORks - SEWERMATER CONNECTIONS DRIVEWAY PERMIT FIRE DEPARTMENT RECEIVED BY BUILDING INSPECTOR DATE_ Revised 9197 jm f g,�117 E tin — — Per Plan -- -- 97.5 ��` '�� `` 1 �� ��► Per Plan ~' 96.7— 9 .. ►�. flap#5 `Os� 7 flags, i u 93.9 "'�- 95.6 90. % �. N 79 °pg, S8" W 97.1 97.10 96.9 21 SQ li flag 9380 NO C 43 ef% (0 PY FORM U - LOT RELEASE FORM INSTRUCTIONS: This form is used to verify that all necessary approvals/permits from Boards and Departments having jurisdiction have been obtained. This does not relieve the applicant and/or landowner from compliance with any applicable or requirements. ***************—***********APPLICANT FILLS OUT THIS SECTION IC— . APPLICANT Pk I 4 T_) kcMe_ -'r2d15 ;----"LOCATION: Assessor's Map Number 3 8 SUBDIVISION PHONE �� � K� PARCEL v LOT (S) v' STREET P, Road ST. NUMBER5 ******************OFFICIAL USE ONLY*********� ? Iyx�I ►4oi���coti RECOMMENDATIONS OF TOWN AGENTS: ` �a& S Z CONSERVATION ADMINISTRATOR DATE APPROVED DATE REJECTED '70114 00 COMMENTS TOWN PLANNER DATE APPROVED DATE REJECTED COMMENTS FOOD INSPECTOR -HEALTH DATE APPROVED DATE REJECTED SEPTIC !NSPECTOR-HEALTH DATE APPROVED DATE REJECTED COMMENT PUBLIC WORKS - SEWERIWATER CONNECTIONS DRIVEWAY PERMIT FIRE DEPARTMENT RECEIVED BY BUILDING INSPECTOR DATE r?�e�i. 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For an intermittent (i.e., ephemeral) stream, the mean annual low flow is considered to be no flow. The limit of the LUW may therefore be the lowest cross-sectional elevation, which may or may not be the center of the stream. Since a stream must contain both LUW and Banks, even intermittent streams which are dry must contain LUW since at some time during the year they underlie flowing water. The area of LUW may be a narrow line in the center of the channel, or it may be the area between the first break in slope at either side of a flat -bottom stream channel. A stream is defined under § 10.04 of the Regulations as a body of running water, including brooks and creeks, which moves in a definite channel in the ground due to a hydraulic gradient, and which flows within, into or out of areas subject to protection under the Act. A portion of a stream may flow through a culvert, either enclosed or open, or beneath a bridge, or in a swale or ditch. A stream is perennial if it flows all year, except perhaps during periods of unusual drought. These streams generally drain a large watershed or are the outlet of a large upgradient vegetated wetland, lake, or pond. A perennial stream may, but does not necessarily, have a year-round fisheries population. There is often vegetation growing on submerged rocks. Perennial streams with good water quality may have rich and diverse populations of insects which cannot tolerate seasonal drought. The soils beneath a perennial stream often show indications of constant saturation. An intermittent or ephemeral stream does not flow year round. It may flow in all seasons except during the driest summer months, or only after precipitation, or when groundwater levels or water from snow melt is high. An ephemeral stream may have a seasonal fish population. There is often little or no vegetation on the rocks and the only invertebrates present are those species which can tolerate periods of drought. The soils may or may not show hydric characteristics. Streams may be found in a continuous or intermittent (non -continuous) channel. Although most perennial streams are in a continuous channel, portions of the stream may be subsurface, e.g., in a culvert. Subsurface portions may be treated as a natural culvert. Ephemeral streams may be continuous, or they may be broken by areas without defined flow. The only portions of any stream which are subject to the Wetlands Protection Act are those which show evidence of above -ground flow. However, a short segment of above -ground stream, clearly connected to an upgradient resource area via an underground stream, may still be considered protectable as LUW and Bank. Man-made channels, swales, drainage ditches, culverts, and agricultural trenches may all be subject to protection under the Act as streams if they drain upgradient resource areas. In spite of the above, the cutoff for jurisdiction of intermittent streams is that portion upgradient of all bogs, swamps, wet meadows and marshes. These upgradient drainage channels are generally those which flow in direct response to precipitation. They may be located on hillsides where they consolidate sheet flow, along roads and highways, across lawns, and in other situations where they are not draining an upgradient wetland. Although entire hillsides may be drained by "upgradient intermittent streams," these channels are not under the jurisdiction of the Commission. This was a political decision under the 1983 Regulations and does not relate to the importance of these streams, especially for flood control. 12.17.4 Land Subject to Flooding Bordering Land Subject to Flooding The floodplain of a water body is the surrounding land which is inundated by water rising from the water body during or after storms or spring snowmelt; i.e., the area subject to flooding. - Bordering Land Subject to Flooding (3 10 CMR 10.57(2)(a)) under the Act is that land surface which will be Environmental Handbook for Massachusetts Conservation Commissioners 171 covered with water in a statistical 100 -year storm. A "100 -year storm" is the maximum amount of precipitation, which is likely to fall in a 24-hour period with the statistical one percent chance of occurring in any year. This is incorrectly but commonly referred to as an average of once in 100 years. This amount is based on National Weather Service records. BLSF begins at the edge of a Bank or a BVW. It does not have a buffer zone. The Regulations require that the outer boundary of BLSF be determined, if available, by data produced and mapped by the National Flood Insurance Program of the Federal Emergency Management Agency (FEMA; HB § 14.2.3). Otherwise, maximum observed flood elevations should be used pursuant to 310 CMR 10.57(2)(a)(3). If these aren't available and conflicts exist, calculations based on NRCS TR55 and the National Engineering Hydrology Handbook, Section 4, may be required by the Commission. The elevation of BLSF must be based on a storm of 7 inches in 24 hours and be prepared by a registered professional engineer or other competent professional. The floodplain boundary is .always expressed as an elevation and any land above this elevation is not considered BLSF. Elevations may be expressed as feet above either sea level (referenced on plans as VSGS or NGVD elevation base) or an arbitrary survey point on the sites. Compensatory storage is required for any project that fills BLSF. It is important to note that the FEMA maps do not show all floodplain areas that may exist. FEMA information is generally available only for larger water bodies. In addition, if considerable development has occurred since the studies, the boundaries may have moved outward as a result of increased runoff. Each Commission should have the latest FEMA Flood Study and a complete set of maps. BLSF is presumed significant to flood control and storm damage prevention. The performance standard for work in this floodplain area is, in effect, 100 percent flood storage. compensation. In other words, any work diminishing flood storage (as through fill) should be offset by the same amount of storage elsewhere in the same reach of the river at the same elevations. The Commission may waive ( y this requirement but should rarely do so since the extra water will have to go somewhere. Alternatively, the building may be elevated to the 100 -year flood level. FEMA regulations do not permit habitable areas, including basements, to be built below that elevation. (FEMA requirements are discussed in HB §14.2.3.) Since BVW and BLSF are both found next to water bodies, they often overlap—but are still separate resource areas with distinct performance standards. A Commission must apply both to a proposed project. Undeveloped land in the 10 -year flood plain is considered significant to wildlife habitat. Vernal Pools anywhere on the 100 -year floodplain or on ILSF are presumed significant to wildlife habitat, but only if they have been certified by the Division of Fisheries and Wildlife (HB §12.17.5). This presumption can, however, be overcome. Vernal Pools are discussed below. Isolated Land Subject to Flooding A second category, known as Isolated Land Subject to Flooding (ILSF), is less well protected. ILSF includes isolated depressions or closed basins that serve as ponding areas for run-off or high groundwater (310 CMR 10.57(2)(b). It too lacks a buffer zone. ILSF must contain at least one quarter acre feet of water volume at least annually, with an average depth of six inches (an acre foot is the volume of water which would cover one acre to the depth of one foot). ILSF is protected (if it meets the size standard) whether flooded by surface water or rising groundwater. DEP Policy 85-2 clarifies the meaning of "isolated depression." The boundary of ILSF is the perimeter of the largest observed or recorded volume of water in the area, or is determined by engineering calculations pursuant to 310 CMR 10.57(2)(b)(3). This resource area is presumed significant to flood control and storm damage prevention, and may be presumed 172 . Environmental Handbook for Massachusetts Conservation Commissioners 310 CMR: DEPARTMENT OF ENVIRONMENTAL PROTECnON n 10.58: continued 5. The conversion of lawn to uses accessory to existing single family houses in existence on August 7, 1996, such as decks, sheds, patios, and pools, provided the activity is located more than 50 feet from the mean annual high-water line within the riverfront area or from bordering vegetated wetland, whichever is farther, and erosion and sedimentation controls are implemented during construction. The conversion of such uses accessory to existing single family houses to lawn is also allowed. (Mowing of lawns is not subject to jurisdiction under 310 CMR 10.00); 6. The conversion of impervious to vegetated surfaces, provided erosion andsedimentation controls are implemented during construction; and 7. Activities that are temporary in nature, have negligible impacts, and are necessary for planning and design purposes (e.g., installation of monitoring wells, exploratory borings, sediment sampling and surveying). Activities not meeting the requirements of 310 CMR 10.58(6)(b) may be allowed through a Determination ofApplicability or a Notice of Intent. If resource area boundaries are uncertain, a Request for Determination of Applicability or Notice of Intent should be filed. (c) On-site sewage disposal systems in existence on August 7, 1996 and the repair or upgrade of existing systems in compliance with 310 CMR 15.000. New construction of a system under 310 CMR 15.000 must comply with 310 CMR 10.58, subject to the presumption for the siting of systems in 310 CMR 10.03. (d) The expansion of structures, airports, and marine cargo terminals, provided they are owned by a political subdivision and the expansion activity was physically begun on or before November 1, 1996. (e) Projects for which a draft environmental impact report was prepared and submitted pursuant to M.G.L. c. 30, § 62B, on or before November 1, 1996, or as extended by the Department for just cause but no later than December 31, 1996. (f) Projects for which a building permit conforming to local requirements was filed on or before October 1, 1996 and granted on or before April 1, 1997, or as extended by the conservation commission for just cause by no more than 60 days. (g) The road and infrastructure shown on a definitive subdivision plan approved or endorsed under M.G.L. c. 41, § 81U, on or before August 1, 1996. Activities on the subdivided lots are subject to 310 CMR 10.58 unless they received a building permit under 310 CMR 10.58(6)(f). (h) Construction, expansion, repair, restoration, alteration, replacement, operation and maintenance of public or private local or regional wastewater treatment plants and their related structures, conveyance systems, and facilities, including utility lines. (i) Structures and activities subject to a M.G.L. c. 91 waterways license or perrrit, or authorized prior to 1973 by a special act, are exempt, provided the structure or activity is subject to jurisdiction and obtains a license, permit, or authorization under 310 CMR 9.00. (j) Activities within riverfront areas subject to a protective order under M.G.L. c. 21, § 17B, the Scenic Rivers Act. (k) Activities on land occupied by historic mill complexes. 10.59: Estimated Habitats of Rare Wildlife (for inland wetlands) If a project is within estimated habitat which is indicated on the most recent Estimated Habitat Map of State -Listed Rare Wetlands Wildlife (if any) published by the Natural Heritage and Endangered Species Program (hereinafter referred to as the Program), a fully completed copy of the Notice of Intent (including all plans, reports, and other materials required under 310 CMR 10.05(4)(a) & (b)) for such project shall be sent to the Program via the U.S. Postal Service by express or priority mail (or otherwise sent in a manner that guarantees delivery within two days). Such copy shall be sent no later than the date of the filing of the Notice of Intent with the issuing authority. Proof of timely mailing or other delivery to the Program of the copy of such Notice of Intent shall be included in the Notice of Intent which is submitted to the issuing authority and sent to the Department's regional office. Estimated Habitat Maps shall be based on the estimated geographical extent of the habitats of all state -listed vertebrate and invertebrate animal species for which a reported occurrence within the last 25 years has been accepted by the Program and incorporated into its official data base. 10/03/97 (Effective 10/06/97) 310 CMR - 402 R I ® FORM U - LOT RELEASE FORM INSTRUCTIONS: This form is used to verify that all necessary approvals/permits'from Boards and Departments having jurisdiction have been obtained. 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CO) C CO rm C CD O C D 'o m m 0 CD i co C O O O. C. cma C c J -0 CO Z CO C. CO2 C Page 1 of 1 McKay, Alison From: Sullivan, Jack Sent: Monday, April 26, 2004 3:10 PM To: Johnson, Adele Cc: Rees, Mark; Parrino, Julie; McKay, Alison; Hmurciak, Bill Subject: RE: Resident Diane Sachs or 35 HollyRidge Road Everyone, Mrs. Sachs property at #35 Holly Ridge Road has a long history of drainage issues (prior to Peachtree development). Basically, Mosquito Brook runs through her property and there is an established flood plain on the property as well. I spoke to Mrs. Sachs after one of the large rain events (April 2, 2004) and she stated that Peachtree Development was contributing to and advancing her drainage problems. I explained to her that a detailed drainage analysis and design was completed for the Peachtree development and that peak flow rates following development of the site can not exceed peak flow rates prior to construction. To break down a complicated process ... the engineer must design a drainage system that does not increase peak runoff flows to off-site areas. Mrs. Sachs stated that she visually witnessed a failure in the detention basin at Peachtree Farms during the April 2nd storm event. VHB provided an engineering analysis in 2002 of the Mosquito Brook Drainage Basin and in the report concludes that little can be done to improve the flooding conditions where Mosquito Brook crosses Holly Ridge Road. VHB targeted 4 other areas along Mosquito Brook which are presently being analyzed for possible improvements. Adele ... I am forwarding a memorandum to your attention dated December 12, 2002 which details the Mosquito Brook Hydrology Review. I have highlighted the areas in the memo which deal in the vicinity of #35 Holly Ridge Road. If you have any questions please feel free to call. Jack -----Original Message ----- From: Johnson, Adele Sent: Monday, April 26, 2004 10:27 AM To: Sullivan, Jack Subject: Resident Diane Sachs or 35 HollyRidge Road Hi Jack, I left you a message last week regarding Mrs. Sachs water problem on her property due to the Peachtree development. Could you please give Mark background information regarding this problem before I set up a meeting with him and the resident. Thanks, Adele J. Johnson Administrative Secretary Town Manager's Office 978-688-9510 tmsecretaryC&-townofnorthandover.com 2/24/05