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HomeMy WebLinkAbout20140805 OUTSIDE CONSULTANT REVIEW COMMENTS 7 10 zn n. June 30, 2014 North Andover Planning Board 1600 Osgood Street North Andover, MA 01845 Attn: Curt Bellevance, Director of Community Development RE: Stormwater Review North Andover Fire Station Dear Mr. Bellevance and Board Members: Per your request, I have reviewed the preliminary design plans and drainage calculations submitted in conjunction with Site Plan Review Application for the above-referenced project. Included in the materials I received and reviewed were the following: • Site Plans, Central Fire Station, North Andover MA, Sheets CI through C5, prepared by Donham & Sweeney Architects and Polaris Consultants, LLC, dated 2/24/14 and revised through 6/12/14. • Drainage Calculations, North Andover Fire Station, Town Rational Method (12 pp), email dated 6/13/14. 1 have also discussed the project via telephone with the Applicant's engineer, Paul Costello. My primary focus in this technical review is on the overall stormwater management approach and design concepts used in the project, as well as its compliance with the Town of North Andover's zoning requirements for Site Plan Review. It is my understanding that a Request for Determination (RDA) for the project will also be filed with the Conservation Commission; my review is aimed at assisting both boards in their respective reviews of the project. The project site is a 46,289 sf parcel at the southeasterly comer of Chickering Road (Rt 125) and Prescott St. It is presently an open ball field with drainage overland in a southerly direction,toward the North Andover High School property My initial comments on the application are outlined below: 1. The proposed project is subject to the site plan review regulations, which, in terms of drainage, require mitigation of runoff from the site for up to the 100-yr storm event. As such, it is not subject to the North Andover Stormwater Management U,,!­� V) Sudbury AA'A 7'� ::O�J JLl 30, 701e' and Erosion Control Regulations. Assuming that a negative determination of applicability is obtained from the Conservation Commission relative to the drainage swale along the Route 125 frontage, the project will also not be subject to the requirements of the Massachusetts Stormwater Standards. 2. The project site is characterized by relatively high permeability (H5G B) soils and a relatively shallow groundwater table. In order to minimize the subsurface infiltration area needed, consideration should be given to the use of pervious pavers or porous concrete in the visitor parking area and other areas that will not be subject to the loading and turning of heavy equipment. 3. The drainage calculations appear to indicate that the three proposed infiltration areas shown on the 6/12114 grading and drainage plan can store and/or infiltrate sufficient volume to mitigate runoff rates from the 100-yr storm event, however it is unclear what specifically is being proposed in terms of infiltration units and whether sufficient allowance is made for the spacing between the units (e.g. the 4 x 4 leaching chambers typically have small "feet" that require several inches of separation between rows). Design details for the systems will be needed. 4. The calculations call for 6-inch drainage pipes. To the extent that the attenuation of runoff flow from the site is to be provided in subsurface structures it will need to be demonstrated that the conveyance system is sized accordingly, e.g. for the 100-yr storm. Alternatively, the analysis needs to address how flow in excess of the conveyance capacity will be handled and demonstrate that there will be no downstream flooding impacts. 5. 1 recommend that the infiltration structures have a minimum setback of 10 ft from a property line in order to minimize impacts to abutters. 6. Design details have not yet been provided for the water quality units proposed to treat the parking lot runoff prior to discharge to the infiltration systems, however based on my conversation with Paul Costello it is my understanding that they would be oil/water separators. In order to maximize sediment removal and preserve the longevity of the infiltration systems I recommend that the units also include a grit separation chamber. 7. Proposed catchbasins should have a minimum 4-ft sump and hooded outlets. 8. 1 note that the plan calls for a new catchbasin at the proposed entrance from Route 125, presumably discharging to the existing swale and not the onsite infiltration systems. In order to meet the requirements for a negative determination of applicability from the Conservation Commission the site should be graded to limit the runoff to this catchbasin to existing pavement area only. I also note that provided the new catchbasin is equipped with a deep sump and a hooded outlet, it should provide a net improvement with respect to the water quality of the existing pavement runoff discharged to the Swale. Nocth J:J 9. It is unclear how much offsite drainage flows to the existing drainage swale. In order to minimize any restriction of the flow in the swale I recommend a box culvert sized to match the existing channel width in lieu of the proposed 36-in culvert. I appreciate the opportunity to assist the North Andover Planning Board and Conservation Commission with the review of this project, and hope that this information is suitable for your needs. Please feel free to contact me if you or the applicants have any questions regarding the issues addressed herein. Sincerely, EGGLESTON ENVIRONMENTAL Lisa D. Eggleston, P.E. C: Jennifer Hughes, Conservation Administrator Enright, Jean From: Lisa Eggleston <| Sent: Monday,July 14, 2O141O:17AK4 To: Paul Costello Cs Willis, Gene; Enright,Jean; Hughes, Jennifer Subject: Re: North Andover Fire Station Paul., WN n8bg is specifica(k/ to review for compliance with Site Plan Review and VYP4 conformance. TO that end, the infiltration systen03sh0Uid be sized based on RDwis iOfi[t[ation rates (or similarly conservative SDii tests) and the drainage tines need to be sized tOdebYer the flow tOthe systems. White | VYi[[ point out potential design issues where | see them, | 0enerd(iy defer tV the Town Engineer in terms of the minimum cover, pipe sizes and slope requirements ' particularly where this isa town project aDdthSyYViiibeMssponsibi8fDreDsV[inQtheVDgoiDy fumcLiVna[i[y0f the system. Lisa D, EggieStOD, P.E. Eggleston Environmental 32 [)(d Framingham Rd, Unit #29 Sudbury, MAO1776 Tel 508.259.1137 From: Paul Costello Date: Friday,July 11, 201411:27AK8 To: Lisa Eggleston Subject: North Andover Fire Station Lisa, | hope all |swell. Our client, Donhom and Sweeney, tells nne that the Town Of North Andover has scheduled aenRDA meeting with ConComm for the proposed Fire Station on August 13, 2O14. I've let them know that vve would heatrisk in sizing the drainage pipes and taking the drainage calculations further until vxe get a positive determination that the Chickering Road mwa|aix not awetland. However, since the meeting is well into the future,they asked |fI could send you over the attached pipe calculations for the Visitor's Parking area. VVe are referring to |tas Proposed Drainage Area � No.1 (PDA-1). Using a peak 100-year rainfall of 2.8 inches/hour over such a small area (5,290 SF)we get a total runoff of about 154 GPM. Gene was thinking of a 12" minimum pipe, however we believe that a 6"t 8" PVC pipe is more than adequate and the 12" pipe is very conservative. VVe will also need to determine the minimum cover over the pipe. We've used 6"and know this is shallow, however,the groundwater is dictating the invert elevations,and a minimum pipe size and larger cover would require the Town bringing more fill to the Site. Could you take a quick look at the attached osan example of the pipe sizing and let os know what minimum parameters you would be looking for(peak storm event, min. pipe slope, min. pipe sizes, min. cover,etc.)? The plan would be to work through the final pipe and Infiltration Area sizing as much as we can before the RDA meeting. VVe will hold off mn the proposed Drainage Areas near the swa|e. Thanks, 1 ���� �w" Paul {}. Costello, P.E POLARIS CONSULTANTS 34 Main Street, Suite 201 yivozom8z Massachusetts 02360 Office: 617-689-1010 Cell: 617-750-8135 � ���� Please note the MassachLiSettS secretary of State's office has determined that most emails to and from mUnicipal offices and officials are pUblicrecords.For more information please refer to: . Please consider the environment before printing this email. EnricL,ht, Jean From: Lisa Eggleston <I' Sent: Monday,August 11, 2014 2:10 PM To: Paul Costello Cc: Hughes,Jennifer; `Chris Logan'; Enright, Jean; Rellavance, Curt Subject: Re: North Andover Fire Station This looks good, thanks Paul. Jennifer and Jean, I think this takes care of my comments on the project. Let me know if you need anything else. Lisa D. Eggleston, P.E. Eggleston Environmental 32 Old Framingham Rd, Unit #29 Sudbury, MA 01776 Tel 508.259.1137 From: Paul Costello< > Date: Monday,August 11, 2014 2:06 PM To: Lisa Eggleston < Cc:Jennifer Hughes< >, 'Chris Logan' Subject: RE: North Andover Fire Station Lisa, If we place the pea stone at the bottom to prevent migration of fines under load to the 3/" stone we still have good filtration. On the sides we can go with the higher Apparent Opening Size material. Does the attached detail work? Paul From: Lisa Eggleston [ Sent: Monday, August 11, 2014 12:18 PM To: Paul Costello Cc: 'Jennifer Hughes'; Chris Logan Subject: Re: North Andover Fire Station How about a combination of the pea stone layer underlain by the lighter weight fabric? Lisa D. Eggleston, P.E. Eggleston Environmental ° 32 Old Framingham Rd, Unit#29 Sudbury, MA 01776 Tel 508.259.1137 From: Paul Costello Date: Monday,August 11, 2014 12:14 PM To: Lisa Eggleston Cc:Jennifer Hughes <Ihi�o; �� -` h ndo� r >, Chris Logan m> Subject: RE: North Andover Fire Station I 1 I Lisa, The 4-oz filter fabric we recommended has an Apparent Opening Size (AOS) of 70(0,212 mm). If we go with a lighter weight Fabric(3.1-oz)the AOS is 50`x(0.30 mcrr)„;This is an ing 41.5ro. If we want to use soils, I suggest put in a 6" layer of 124" to 122" pea stone. Paul From: Lisa Eggleston Sent: Monday, August 11, 2014 10:47 AM To: Paul Costello Cc: Jennifer Hughes Subject: Re: North Andover Fire Station Paul, I don't know whether you've had any additional thoughts on this. My suggestion would be a layer of sand beneath the stone to help trap any fines moving in either direction, underlain by a fabric with a minimum 50 micron opening. I think that would alleviate my concerns with the fabric getting clogged with silt over time and causing major disruption if the systems need to be dug up, replaced, etc. Would itaiso work for you-,An terms of protecting the integrity of the pavement? . s Lisa D. Eggleston, P.E. Eggleston Environmental 32 Old Framingham Rd, Unit#29 Sudbury, MA 01776 Tel 508.259.1137 From: Paul Costello<p L@polariscon.com> Date: Wednesday, August 6, 2014 1:30 PM To: 'Brett Don ham'< _ , Lisa Eggleston _ Cc: 'Chris Logan'< > Subject: RE: North Andover Fire Station I agree with Brett that we finalize the detail before the ConComm meeting so as not to have a loose end. Paul From: Brett Donham .m Sent: Wednesday, August 06, 2014 12:39 PM To: Paul Costello; _...__ Cc: Chris Logan; Subject: FW: North Andover Fire Station Paul and Lisa, See message below from Curt. Thank you for your help in making that happen.. My understanding is that there remains one open issue that you expect to resalve,with the,assistance of"one of the members of the Conservation C or n fission; that is, the nature of the litter material. flow do you imagine;that to happen? Will it happen before the Commission meeting ou"the°t" `k'with-the assistance ofJonnif"air Hughes or do you expe0pit4o happen ill,,discussions at-the meeting`? t personalf:y fi el,niore connfortabfo with the former approach so there are no loose ends gaging into the meeting, but t wanted to get your take on how and when this would happen. 2 '. ' Please let mo have your thoughts. Thank you. Brett Brett 0oobmm,AUA Founding Principal A izCB |TE CTS 688n,,ism`Avenue emxou MA 02111 (617)423-1 400d7 8d10ovuooFacdoo1...Linked III~('uqgJe± From: Be||avaOce, Curt Sent: Wednesday, August 06, 2O1413:O3PM To: Brett 0onharU Cc: SantiUi/ Ray; May|Or, Andrew; Chris Logan Subject: RE: North Andover Fire Station Yes,the PB voted and approved the project. Once the vote /s added to the approval | will get you acopy. From: Brett Donhdnl Sent: Wednesday, August 06, 2014 9:38 AM To: Be||a"enme, CUrt Cc: SantiUi, Ray; May|or, Andnaw; Chris Logan Subject: North Andover Fire Station Curt, How did things g0 last night with the Planning Board? 1fthey voted Dfimal decision, may ] have 8 copy of it? T want touse i1a« 4 check list to make sure all their stipulations are included iu the Construction Documents. Thank you. Brett Brett 0/onbam,/&UA Founding Principal ARCnI?ECT8 68 1 lm`ivuo4vouvn Boston, MA 02111 (6l7)423-|408v|7 Follow v000laceJ4ok-Linked III-1LQo'gdk.± 3 000 a a a o a a a . a 00 00 000 0 00 c 00 000 O 000 a &� 00 00 c 00 000 O 00 c 00 000 O 0o 00 Z o Z 0 OO = O _ � 00 2-1 z o o p CC) mD N C a oo m > C C X w o o � D m mu"' rn TI « �' - z cn TI oo D © - z r�C^n o o ; r m D v� m© 0 � m o 0 ) a r m Z 00 �] m � ) o c7 T © o o o � � m oo ) o 00 00 o 000 0 c 00 000 ) o -TI o 0 0 0, 00 r 0 a a o Q a o 0 0 r 000 � O 00 a a a a o a a a 00 000 0 00 00 W 0 0 > _ O D N --4 0 cCn -n 0 m � -n --q m > C/) 0 m � � D 0 = o© -n � n C o � N D O Enright, Jean From: Brett Donham <hrin WA— Sent: Tuesday, August 05, 2014 2:27 PM To: Hughes,Jennifer; Enright,Jean; Bellavance, Curt; Santilli, Ray; Maylor,Andrew Cc: Logan Subject: New Central fire Station Attachments: 20140805131400.pdf Friends, Attached is the correspondence that addresses the last of the open issues with the proposed stormwater recharging system for the Fire Station site. I have asked Polaris Consultants to send you PDF's of the revised drawings. Sincerely, Brett Brett Donham,AIA FOUnding Principal Donham&Sweeney ARCHITECTS 68 Harrison Avenue Boston,MA 02111 (617)X123-1100 x17 Follow us on Facebook—Linked In—Google+ I Donham & Sweenev hITShn+r,Principal,AtA t_EEn All A H H 1 T E C T S Brett Donham,Pounding i'r'is dpal,A IA C.Christ herlx►yan,Ass wrote,AIrA Conservation Commission Town of North Andover 1600 Osgood Street Suite 2035 North Andover MA 01845 5 August 2014 Re: New North Andover Central Fire Station Dear Madams/Sirs: This morning I received an a-mail for the Town's Civil Engineering Consultant,Lisa Eggleston,that described 4 changes she wanted made to the storm water re-charging system designed by Polaris Consultants, See attached copy of the e-mail. Around Noon today, Lisa Eggleston and Paul Costello, a principal at Polaris, discussed Lisa's requests and Paul will incorporate Items 1,2, and 4 into the construction documents. Regarding Item 3,the use of a filtration medium,they both agree that a course medium will be used and look forward to the recommendation of a member of the Conservation Commission as to the preferred medium. I believe this agreement between the two engineers should close all the remaining open issues. Thank you for your consideration of this project. SinctpAya r o , Copy: Jennifer Hughes Lisa Eggleston • P1441 Curt Bellavance Jean Enright Ray Santilli, Brian DeFilippis Chris Logan File: 1304:5.3 68 Harrison AvellUr 4 Hcitd Tide(:hunch Rd. Boston MA 02 11 1 Post Mice Box 265 617 423 1400 Alna i.11' 04533 donhxmtindswoc[icy,coin ' 0 7 5 8 6 6 0 0 0 Page 1 of 2 Brett Donham From: Lisa Eggleston Sent: Tuesday, August 05, 2014 8:20 AM To: Paul Costello Cc: jen rig ht@townofnorthandover.cc m; Brett Donham; Chris Logan; Jennifer Hughes Subject: Re: Revised Plan Set Thanks Paut, A couple of comments on the plans: 1. I don't see anything on the plans that specifies which infiltration system details (leaching galley vs. diffuser) applies to which system, how many units are being called for, and what the spacing between rows on the galleys is. 2. Inspection port locations (at least 2 for each infiltration system) should be shown on the plan. 3. i strongly recommend against using filter fabric below the systems infiltrating pavement runoff; studies by the UNH Stormwater Center have demonstrated that it is prone to clogging and can lead to system failure. This is particularly of concern where you have minimal pretreatment of flows into the system. UNH recommends a fitter layer of bank run gravel instead of the fabric. 4. As far as pretreatment, I think we both agree that there needs to be some second line of defense besides the catchbasins to remove sediment upgradient of the infiltration systems. it was my understanding from our discussion that the drain manholes would have deep sumps since the Town Engineer did not have the equipment needed to maintain a separate grit separator. (My guess is that was in reference to one of the proprietary separators, e.g. Stormceptor, which would require a vacuum truck to maintain and not to a concrete grit chamber). I do not see any design detail for the storm drain manholes, deep sump or otherwise, on the plan. Let me know if you want to discuss. Lisa D. Eggleston, P.E. Eggleston Environmental 32 Old Framingham Rd, Unit#29 Sudbury, MA 01776 Tel 508.259.1137 From: Paul Costello<pge _ OM Date: Monday,August 4, 2014 3:25 PM To: Lisa Eggleston Cc:<' , 'Br s Logan'< Subject: RE: Revised Plan Set Lisa, Attached is the stamped set of drawings. Paul From: Paul Costello Sent: Monday, August 04, 2014 3:15 PM 8/5/2014 Page 2 of 2 To: ' Cc: '' 'Brett Donham'; 'Chris Logan' Subject: Revised Plan Set Lisa, I understand that you have not yet received the hard copies we discussed on Friday. Attached is an electronic copy.You will find that we have addressed all of Gene's comments. Paul Paul G.Costello,P.E. POLARIS CONSULTANTS LLC 34 Main Street,Suite 241 Plymouth, Massachusetts 02360 Office: 617-689-1010 Cell:517-750-8135 8/5/2014 EnriUht, Jean From: Lisa Eggleston Sent: Tuesday,August 05, 2014 10:43 PM To: Paul Costello; 'Brett Donham; Hughes, Jennifer; Enright, Jean; Bellavance, Curt; Santilli, Ray; Maylor, Andrew Cc: Subject: Re: New Central fire Station These revisions satisfactority address my earlier comments; the onty outstanding item is to define the"coarse fitter medium". Lisa D. Eggleston, P.E. Eggleston Environmental 32 Old Framingham Rd, Unit #29 Sudbury, MA 01776 Tel 508.259.1137 From: Paul Costello VReI@M%*XPJFffnTMV> Date:Tuesday,August 5, 2014 3:44 PM To: 'Brett Donham' i>,Jennifer Hughes<;rlitr "'Enright,Jean"' <* "Maylor, Andrew.•• Cc: Lisa Eggleston 'Chris Logan' Subject: RE: New Central fire Station All, Attached are the revised Sheets C-4, C-5 and C-6. Sheet C-4 has the maintenance manholes added to the infiltration areas, Sheet C-5 has the galley layout and the new maintenance manholes, and Sheet C-6 provides the deep sump drain manhole detail and changes the "4 oz. Filter Fabric"to a "Coarse Filter Medium". Paul Paul G. Costello, P.E. POILARIS CONSIJILTANTS LLC 34 Main Street, Suite 201 Plymouth, Massachusetts 02360 Office: 617-689-1010 Cell: 617-750-8135 From: Brett Donham Sent: Tuesday,August 05, 2014 2:27 PM To: tewoofaqdbaa aL4qw; Enright,Jean;e Taylor, Andrew Cc: Paul Costello; ftd.e44 K-o fltaeam.s"Ww , Chris Logan Chris L Subject: New Central fire Station Friends, Attached is the correspondence that addresses the last of the open issues with the proposed stonriwater recharging system for the Fire Station site. I have asked Polaris Consultants to send you PDF's of the revised drawings. Sincerely, Brett Brett Donham,AIA Founding Principal D011111MI7 & Tk­c 1-1 IT L�CT S 68 1 lanison Avenue Boqon, NIA 02111 (617),123-1100 x 17 Follow us on Facebook [Anked In w0gle 30 ........... 2 Enri2ht, Jean From: Lisa Eggleston � Sent: Tuesday, August O5, 2O148:20AM To: Paul Costello Cc: Enright,Jean; 'Brett Donham'; 'Chris Looan'; Hughes,Jennifer Subject: Re: Revised Plan Set Thanks Paul, 4 couple of comments on the plans: 1. | don't see anything on the plans that specifies which infiltration system details (Leaching gDikev Ys. diffuser) applies tO which system, how many units are being called hJ[, and what the spacing between rows on the galleys is. Z. |O3peCti0A port locations (at least for each infiltration system) should be shown VO the plan. 3. | mLpongiy recommend against using filter fabric be(OYY the systems infiltrating pavement runoff; studies by the UNH Stor[DYvater[ent8r have demonstrated that it is prone to clogging and can lead to system fdi[UF8. This is particularly of concern where you have nliOi0Di pretreatment OffiOvVS into the system. UNH recommends a filter layer of bank run gravel instead Of the fabric. 4. AS fu[ as pretreatment, | think we both agree that there Deeds t0 be some second tine of defense besides the catchbaminsto remove sediment UpgradieOtOf the iOfi[t[adVn systems. it was Oly understanding from our discussion that the drain manholes would have deep sumps since the Town Engineer did not have the equipment needed to maintain OsepdraLe grit separator. (My guess is that was YO reference tVone of the proprietary separators, e.g. StVrnmceptOr, which would require 8 vacuum truck to maintain and not to concrete grit chamnber). | dO not see any design detail for the storm drain manholes, deep sump Vr otherwise, OD the plan. Let nle know if you want t0discuss. Lisa D. Eggleston, P.E. Eggleston Environmental 32 0[d Framingham Rd, Unit #29 Sudbury, AW\ Q1776 Tei5O8.259.11]7 ------------------------------------------------------------------------------------------------- From: Paul Costello Date: Monday, August 4, 2O143:25PM To: Lisa Eggleston Cc: 'BrettDonhorn' 'Chris Logan' Subject: RE: Revised Plan Set Lisa, Attached is the stamped set ofdrawings. Paul ----------'---------------------------'---------------------------------'------------------------' Fromm: Paul Costello Sent: Monday, August O4. 2O143:15 PM To: ' Cc: 'Brett Dmnhanl; 'Chris Logan' Subject: Revised Plan Set Lisa, I understand that you have not yet received the hard copies we discussed on Friday. Attached ban electronic copy. You will find that vve have addressed all of Gene's comments. Paul Paul G. Costello, P.B. POLARIS CONSNLTANTS0LC 34 Main 8{recL Suite 201 Plymouth, Massachusetts 0336U Office: 617-689-1010 Cell: 617-750-8135 I