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HomeMy WebLinkAbout1987-07-15 Engineer Review SPR • Y HAVES ENGINEERING, INC. 603 SALEM STREET WAKEFIELD, MA 01880 (617)246-2800 REFERTORLE# NOA--0030 August t3 , I987 North Andover Planning Board Town Hall North Andover. , MA 01845 Attn: Erich W. N'itzsc e, Chairman 4 be��1►tiE����F l`.��������� Dear Mr . Nitzsche: Enclosed are two copies of the Crusader i3aper site plan revised to incorporate Condition 7 of your Site Plan approval® Yoga will note that I added a proposed spot elevation at the entrance to indicate that the sur.tace runoff will riot .Leave the site. I also lowered the culvert one foot to maintain over two feet of cover , as you requc-s ted® I trust that this revision will satisfy your Conditions , as far as Site Plan modifications are concerned. Very truly yours , Edward 2 . Stearns, R.L. S. Hayes Engineering , Inc. l�. E2,S/ciala Enclosures CC . Bill Conroy Maynard Assoc2.ates � �� d HAYES ENGINEERING, INC. 603 SALEM STREET WAKEFIELD, MA 01880 NOA-0030 (617) 246.2800 REFER TO FILE ------- FAX (617) 246-7596 September 7, 1989 Attorney John Willis Willis & Willis Attorneys 160 Pleasant Street - Rear North Andover , MA 01845 RE:: Comparative Quantities Crusader Paper Dear Mr. Willis : In response to the request of Jim Maynard that I provide you , in writing, our estimate of the difference in quantity between the- grading shown along the southerly wall of the Phase I building as originally proposed on the Site Plan of Crusader Paper , dated April 3, 1987 , revised to October 3, 1988, and the Site Plan of Crusader. Paper , dated April 3 , 1987, with final revision date of August 3, 1989, we have computed that quantity and find it to be 15, 400 cubic yards. In addition, there is approximately 1, 400 square yards of additional pavement south of the southerly wall. I trust this information is suitable for your purpose. Very truly yours, Peter J. Ogren, P.L, . , P.f .S. President PJO/dab r Geotechnical consultants of Massachusetts, Ina. (508) 685.4800 21 August 1989 crusader paper Company ry 25 xndustri.al wax Wilmington, MA 01887 Attentriont Mr, Jack Costello RE : Cut Slope Treatment Crusader Paper Facility North Andover, MA Dear Mr. Costello: In accordance with your request and our previous disoussi.ons, herein are our preliminary recommendations relative to the slope .exi.sti.ng at the above referenced site . Based on visual. observations of the site conditions and examination of topographical information compiled by Hayes Engineering, the following alternatives are applicable for slope treatment at the site. As discussed in our earliest report of the site, we recommend that the natural undisturbed glacial till slopes not exceed a 111 gradient. We consider any slopes steeper . than this to be unstable a,nd subject to failure. This includes the existing slopes and rock walls which have been previously constructed without: inspection at the site. The areas around the toe of these slopes should be cordoned off to keep people and equipment a safe distance away. These areas are shown in the sections produced by Hayes Engineering on the south side of the property (between section A and D) . We also consider the stone rip-rap slope constructed on the west side of the property at the southwest: building ;ornex to be .unstable and this area should be condoned off as well until remedial work can occur. To correct the existing unstable slope situations two obvious methods present themselves. The first is to regrade the virgin 'till from the existing toe of slope inwards while keeping at least a one to one slope. This will entail taking away land within the 151 setback strip for a distance of at least +/-100 ;feet along the top of the slope. At some point: between section C and D, construction of a 1 :1 slope will be possible without encroaching on the setback strip. Willows Protesslonal Park 799 Turnplke Street North Andover, Mass. 01845 b v i E n t f i-e r ") r1 r � 1 We recommend that this alternative be pursued as the most ideal solution since this construction could proceed the quickest and would be the least expensive ii1 terms of an overall remediation . si,milavly, it would also be advisabkQ to determine tf the existing toe of ,slope can be moved to the south anywhere alone its length to decrease the amounit . of setback encroaChmant that would be necessary. The other alternative is to regrade the slope with the setback line as the control , bringing the 1 : 1 slope down to the toe . some type of Retaining wall along the toe would be utilized in, this case where the slope would intersect a point higher in elevation than, the existing toe elevations. Retaining wall, construction m.ay include a cast'-in-place concrete structure, or soldier- beam and lagging cantilever retaining wall . Based on our estimates at this time, a soldier beam and lagging wall, is slightly more expensive although it could probably be constructed quicker. Because of the density of the till , any new retaining wall must be keyed into the virgin soil enough to resist the anticipated lateral forces , with the remaInder of the structure then deriving its retaining ability from this foundation. This requIrement eliminates other retaining methods such as crib walls and gabi.ons where friction interaction between the members is the only mode of major. lateral force resistance . The problems inherent with construction of a retaining wall scheme is the existing working conditions which would include the presence of slopes much steeper than 1i1 above the work area, This will require specialized construction. methods which may increase unit, costs significantly. As is evident in our sketches, the effort to place compacted structural backfi.11, behind a cast-in-place wall, would be signifiaant as temporary slope support or protection would be necessary. on the other hand, drilling in soldier beams would decrease the severity of this situation but the actual, drilling. operation may be very difficult due to . encountering boulders in the till . For any type of retaining wall system chosen, a Swale should be created along the backside of the wall to collect uninterrupted runoff and direct it to the site drainage system. similarly, a toe drain must also be included in the construction to relieve any hydrostatic pressures along the 'base of the slope. This 'may be accomplished by either using a collector pipe along the backside of the wall or by placing perforations/weep boles. in the wall to allow water to pass through and be collected on the front side, with regards to construction of the new 1 : 1 slope, we recommend that all loose natural soil or disturbed till be removed to expose dense virgin till . This surface should Z 0 - -=4 T ?: T r-40 14 6 6 - t Z! - nnH then be covered with a filter fabric followed by bedding ' stone in turn covered by tightly fitted rip-rap, as shown ,in our accompanying sketch. This system will. permit Drainage swales running parallel to the contours should be constructed at the top and bottom o,f the slopes and within the slope wherever possible , where zones of noticeably heavy groundwater breakout are observed, vertical, finger. trench drains should be installed to confine the waxer and direct it to downgradi,ent swales . All swales or trench drains should include filter fabric placed directly against the virgin soil before filling with washed crushed stone . The drains should then be covered over with filter fabric again to prevent any sediment infiltration. This use is recommended in particular for the slope where loam has been placed at the southeast cQra,ex- of the site . Similarly, to stabilize the l.oamed slopes until vegetation can be established, biodegradable erosion control blankets can be placed over the slopes . This type of material is manufactured by numerous companies and we can give you further details on the cost of such an application if you wish. we recommend that this method be considered only, for areas where it is apparent that hydxoseedi,ng alone will not be effective . Xn light of the fact that significant site work and slope regrading has occurred at the site to date, we think it is vary important to include inspection of any remedial work by qualified personnel as part of the scope for any Proposed construction. This measure will help to- ensure that the new slope related Work is performed in accordance with proper construction techniques and that any apparent unacceptable Construction now existing is repaired, We trust the above and attached information is adequate for Your immediate needs . If you have anY questions related to the above, please feel free to contact us . Si.ncer ly, Michael C. Penn cc : Jim Maynard, Maynard construction i x 0 d I Nf 1-1 0 A _L 0 73 _-i T 7 T IA 0 1.1 r. >_; - r 71 17 189 13ip8 FWYES F EfZI N i ENG�„r G P.6/8 , f .• r.. ..... . .., .r �,« ;a•'w •,f ,t ,• � r.. r (//,��{/I)/t�Ap� r �}�.,. r i r1 , � '� „ I.• ,.��. . •- ,.,,.,•., ..,�., ,,...y. .»; ,.,� ,fl rl. ,, mom, ,... •. 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TvN Tu I-TON CVLA YI�G•�� �""" �o� �TToM '� !b nl� Sc.opb 'rb ��-ov [ � N I ,...�,,, Ali ,I���.47Ud'T� 8rc�4►tlhl�► ��1�I�C. ► 41 AL.. on L�• t � Q4C. *io, o OM r TAG r-A"1 4 4 k�o o Toter `� o IS To A1. vj W4TCOL 'rD 59SP OWT OF ° Ts•1 S(,opC- WITHOWo~ a.4Af 4M& AW4 r-)N 'a . •, wrPtT 6401NO �48$ 66AINO 'AG I-A 40.tC. w IGL MIT 04-e, 4 `�a� a KA I+� ► Willows Prolasslonal Park • 799 Turnpike Street • North Andover, Mass, 01846 7 t, I d -I —D I i7,114 -LQaJ -2 T I —OW 6e - I Z7 -- nn0