The URL can be used to link to this page

Home My WebLink About20190521 Stormwater Peer Review 5/16/2019 Town of North Andover Fall- e:45 Woodberry Lane-Revised Maledals No AN0�R rh' D a t. S Monica Gregoire mgre dire agnorthandoverma.gov massFie: 45 Woodberry Larne - Revised Materials sbadegss weng. m bade a@ssv-eng.cem Thu, May 16,2019 at :41 AM T : Monica Gregoire rngregoire a@northandoerma.gov Monica: I apologize for overlooking the response letter that you sent me in an earlier e-mail. In my opinion the Applicant has provided satisfactory responses to all of my comments. l have no additional comments. Thank your Sam Bade President frj S SV to ENGINEERING INC. 09 Winter Street Framingham. MA 01702 Ph: 0 -74 -4077 sbade@ssv-eng.com [Quoted text hidden] All email messages and attached content sent from and to this email account are public records unless qualified as an exemption under the Massachusetts Public Records Law. Visit us online at .northando erma.gov. https:llmall.google.com/mail/u197ik=daddl 7 e7&view=pt&search=all&perrnmsgid=msg-PA3A16 869618 96r40978 slmpl=msg-f°/6J 1 3 9 1866... Ill Sullivan Engineering Civil Engineers&Land Development Cons ultan ts April 11, 201 Town of North Andover Planning Department 120 Main Street North Andover, MA 0 1845 Re: 45 Woodberry Lane, North Andover Watershed Special Permit—Response Letter PlanningDepartment; This letter is written in response to the peer review memorandum dated March 19,2019 by SSV En&ccring,Inc. The changes as requested in the memorandum have been made and a revised Site Plan is included as on e art of this response P package(plan revision date of 4 11 019). The following items in standard text below are the peer review comments. Responses are provided in italic font. 1. As required by the watershed Special Permit, written certification by a Registered Professional Engineer, or other scientist educated in and possessing extensive experience m the science of hydrology and hydrogeology, stating that there will net be any significant degradation of the quality or quantity of water in or entering Lake Cochichewick has been submitted; however, the signature for heir.,lack Sullivan,P.E. is missing. g Response: the written Watershed special Permit narrative is now signed1stamped. . As required by the watershed Special Permit, proof that there is no reasonable alternative location outside the Non-Disturbance and/or Non-Discharge Buffer Zones, whichever is applicable, for any discharge, structure, or activity, associated with the proposed use to occur, has been provided but signature for Mr. Jack Sullivan,P.E. is missing. Response: The written Watershed Special Permit narrative is now,signed scam ed. . The Plan submitted shoves the existing adjoining wetlands along with the associated buffer zones; however, the Applicant must show the required delineations i.e., Non-Disturbance and Non-Discharge Zones requ i red for the Watershed Special Permit Application. The Plan states that the entire let is located within the Mon-Discharge Zone; however,the distances inust be called out. Response: the .f of " on-Dish r a c " buffer zone i graphically shown and libeled o the plan. 1 is the sane bufferzone as the 100 foot welding buffer. The "Non-- ischar Zone" is 325 feet from the wedand limes which encompasses the entire lot. There is noway to graphically show this on the plan since the buffer would extend off the plat sheet;a note has been provided stating the entire lot is within the `Non Discharge Zone". 4. The Plot Plan submitted has not been signed and stamped by a Professional Engineer as required. Response: The plot plan issigned and stamped P.O. Box 2004 Woburn,llrlA o1 (781) 854-8644 e-mail:jacksu1153@comeast.net 1 5. The location of the existing sanitary sewer service connection appears to b 'in close proximity to the proposed addition. The Applicant should state if the intent is to p • Pp relocate the sewer service line and/or protect �t during construction of the proposed addition. The Applicant mast also indicate if the location, alignment and depths of this line was confirmed with a test pit or other means. Response: Yhe existing sewer.service is close to the proposed addition. The sewer will not b relocated, Where is a rote provided that the contractor shall take caution while excavating. . The Plan should indicate access manhole frame and corer for maintenance of the proposed drywell. The length and width of the proposed drywell must be shown on the plan. Response: A note has been added to the drywell delail that a 24" Cast Frame and Cover (Round) be provided. Additionally, on the dtywell detail a rote has been provided that the drywell dimensions are 5'- "wide x 10'- J) long. . The Applicant should stag the basis for the assumed exfiltration rate of 0.0014 fpm that was used to size the subsurface infiltration system. Response: The infiltration rate of 0-0014fpm is based on the Rawls Rate,for a Sandy Loam soil heing 1.02 in1hr which converts to .0 fpm. . The Applicant must provide basis for the 6 minutes time of concentration assumed in the HydroCAD analysis. Response: For direct entry from a roof system to a drywell the engineering standard for time of concentration is minutes or 0.1 hr . The Hydro AD model as currently setup assumes cxfiltrafion at Elevation 0.001 whereas the bottom of the proposed drywell is at elevation 90. '. The Applicant should clarify the assumed elevation of 0. ' for eAltration. Response: The bottom of store e e rlion .. and bottom of drywell elevation 1.0 were properly modeled urn Hydra . . The exftltration rate of 0.0014 fpm was the correct rate for the existing soil condition. The ex iftratio elevation o� ' " " iris the ro i ro ram i � s ar `set' value that can nol be modified...it is the exfiltration rate that is the variable and has been assigned the correct value. 10. As required by the watershed Special Permit,evidence that allon-site operations including, but not limited to, construction,wash water disposal, fertilizer applications and septic systems will not create concentrations of Nitrogen in groundwater,greater than the federal Limit at the down gradient ofthe property boundary has been submitted;however,the signature for Mr. Jack ullivan,PE is missing. Response. The wriUen Watershed Special Permit narrative is now signed slamped. If you should have any additional questions or comments please feel free to call or email rye. Very Trulft, ours, Jack U1 ' , P.O. Box 2004 Woburn,MA 018881) 854-8644 amall:jacksu1153@comcast.net r ssy HNGiINKERIMAY INC, 609 Winter Street Framingham.MA 01702 Phone: 0 -74 -4 '77 March 19, 201 Ms. Jean Enright,Planning Director Planning Department 120 plain Street North Andover,MA o 1845 Ms. Jennifer Hughes, Conservation Administrator Conservation Department 120 Main Street North Andover, IrIA o 1845 RE: Storm water Review Comments#1 5 Woodberry Lane Dear Ms. Enright and Ms. Hughes: Per your request I have conducted a technical review of the Special Permit- watershed Permit Application for 45 Woodberry Lane in North Andover. I received and reviewed the following documents: I. Special Permit-Watershed Permit Application prepared by Sullivan Engineering Group, LLC. and dated March 8, 2019. . Plot Plan of Lana, 45 Woodberry Lane North Andover, Prepared by Sullivan Engineering Group LLC. and slated March 8, 2019. My comments on the proposed project are outlined below: Written Certification 1. As required by the Watershed Special Permit, written certification bar Registered Professional Engineer, or other scientist educated in and possessing extensive experience in the science of hydrology and hydrogeology, stating that there will not be any significant degradation of the quality or quantity of water in or entering Lake Cochichewick has been submitted; however, the signature for Mr. Jack Sullivan,P.E. is missing. 1 P a ge SSYINKERIN " G INC. 609 winter Street Framingham,MA 0170 Phone: -74 -4077 Alternate Location 2. As required by the watershed Special Permit, proof that there is no reasonable alternative location outside the Non-Disturbance and/or Non-Discharge Buffer Zones, whichever is applicable, for any discharge, structure, or activity, associated with the proposed use to occur, has been provided but signature for Mr. Jack Sullivan,P.E. is missing. Design Plans . The Plan submitted shows the existing adjoining wetlands along with the associated buffer zones; however, the Applicant must show the required delineations i.e., Non-Disturbance and Non-Discharge Zones required for the Watershed Special Permit Application. The Plan states that the entire lot is located within the Non-Discharge Zone; however, the distances must be called out. . The Plot Plan submitted has not been signed and stamped by a Professional Engineer as required, . The location of the existi .g sanitary sower service connection appears to be in close proximity to the proposed addition. The Applicant should state if the intent is to relocate the sewer service line and/or protect it during construction of the proposed addition. The Applicant must also indicate if the location, alignment and depths of this line was confirmed with a test pit or other means. . The Plan should indicate access manhole frame and cover for maintenance of the proposed drywell. The length and width of the proposed d.rywell must be shown on the Plan. Proposed Subsurface Infiltration for Roof Runoff . The Applicant should state the basis for the assumed e #iltratlon rate of 0.0014 fpm that was used to size the subsurface infiltration system. . The Applicant must provide basis for the 6 minutes time of concentration assumed in the HydroCAD analysis. r 9. The HydroCAD model as currently setup assumes es exfilttation at Elevation 0.00' whereas the bottom of the proposed drywell is at elevation 90. '. The Applicant should clarify the assumed elevation of 0.0' for exfiltration. Page ssy1 ,5 ENGIN .R [ ��INC. 609 Winter Street Framingham.NSA 01702 Phone: 508-745-4077 Down-Gradient Nitrogen Statement 1. As required by the Watershed Special Permit,evidence that all on-site operations including, but not limited to, construction, waste water disposal, fertilizer applications and septic systems will not create concentrations of Nitrogen in groundwater, greater than the Federal Limit at the down gradient of the property boundary has been submitted; however,the signature for 1 . Jack Sullivan P.E. is missing. f would be happy to meet with you and the applicant to review these comments at your convenience. Please feel free to contact me if you or the applicants have any questions regarding the issues addressed herein. Very truly yours, aN '.. Sang Bade .resident 1 P a g e