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Home My WebLink About1985-03-26 Engineer Review WSP . Anthony Lally Associates 100 Belmont Street North Andover, Massachusells 01845 fl January , 19911 � Pk° 4 Town of North Andover �� '�� t�� Division of Planning & Community Development a �� ,y ,li, . 120 Main Street both Andover, Massachusetts 01845 Attn: D. Robert Nicene, Building inspector Re : NorLh Andover Wer Treatment Plant, Great Pond Road Reports North Andover, Massachusetts Gentlemen: Enclosed, as requested, are copies of reports pertaining to Section 127 . , "Control o nstru cL " , of the Massachusetts State Building Code on the above referenced project. If you have any qu e5tioa`ns or desire additional information regarding this matter, lease do not hesitate o conLacL this f . Very truly yours, M. Antholky—Why, P .E. M. ANTHONY LALLY ASSOCIATES Enclosures cc: James P. Gordon, Town Manager Karen H.P. Nelson, Division Director ei Date Water Wastewater Solid Waste Surte Development � � + & Sampson - �IVC Cefll lxr]r11{Sl Drive ao4 y,MossacliLrwTI,;0E960-790,4 ! is J N 5 . V C lei_(D3)532-1900 1 ox (5013)977-01OG 4 ✓`tJ:`rrrpJryrt['fd�Jf�{irN9tJ��el�r�?ylrJa'[' �w��l July `1T, 1991 Mr. James V . Gordon k Town Manager 120 Main Stzeet North Andove)c, Massachusetts 01845 t i Re ; Vorth Andover Water Treatment ; Plant -- Site Conditions Dear Mr . Gordon: As you are aware, our office recently conducted a survey to det rmine . the bottom elevations of Lake Cochichewick immediately in front of the plant . ' The results of this survey indicate that both the bottom elevations of the Lace and the shape of the shoreline do not match the existing conditions shown on sheet U7 of M. Anthony Lally Associates original contract drawings . Back in the -1.1all of 1988 , When our firm took over the responsibility for construction resident engineering services of this project, it was irunediately brought to our attention by the contractor that they were confronted with changed lake bottom conditions while installing the gravity intake pipeline and intake structure . The contractor had already installed approximately 00-feet of the intake pipeline, starting at the 10%4 li Et pump station and routing it- northwards into the lake . As a result, the lake bottom elevations may have been altered by this con:stzuction alpng the pipeline route, making it impossible for us to determine the preconstruetion conditions . The contractor contended that the lace bottom ele-rations were d i ffererkt Lhan those shown on Lally"s plans . So, soundings were conducted, starting at ' appro:iimately station +00, along the remaining undisturbed route of the intake line towards the proposed location of the intake structure . The sounding indicated that the contour elevations of the lake bottom were approximately --feet above what was shown on Lally' s plans . Based on the above findings , it appears that ball " s existing plans were incorrect . We can not determine the extent of the in onsistancies where the first two hundred feet of intake pipeline was installed, since the construction may have already altered the existing conditions . However, we do know, based on the zesults of our )recent survey, that the contouzr elevations of the lake bottota and shoreljee differ from Sheet [l7 of the orginal contract dzawings outside of the cornt>~actor ''s proposed limits of , I ti I V r I ' L 11 rii cr.: lCO f ?41+3rs 00vla 1€ 2,ukfi =l e,.nn N ;.(>ir '.iiC+}UCy r•G,+Cit a+w,M.=x;awira P9rRr'a fn1in :r+-"nC.s N'kxri.skir+wC 2 '.7ninui tl rCH� _h.-4 !r Ir,t'r.C,nilinr, :4nrx J1-bHs I J ton & Sampson ` Mr . James P. GorOon July 17, 1991 Page TWO work. Therefore, since design contour elevations are inconsistent with the conditions found, we are unable to evaluate whether the present contour elevations fully comply with the original preconstruction conditions . Tile North Andover onservaL-ion Conkmis ioa ' s Order of Conditions require that the s.ho-f�eline and lake bottom be restored to their original condition . Not, fully knowing what the original conditions wfr re, we can not certify that the project is in compliance . Upon carefully inspect ing the present conditions of the lake, there does riot appear to be any fill material left by construction that would impact or alter the volume of laken . e recently instruoti:-nd the contractor to remove from the bottom of the lake remnants of the erosion control system that was utilized during construction of the intake pipeline . Once that is removed, and there is stable vegetation growth on-site, we will instruct the contractor to remove the erosion control measures presently intact along the shore . At which Lime the restoration efforts will be complete, and the site will be in compliance tG the hest; of our knowledge. Should you have- any questions concerning the above matter, please contact this-,office . Very truly yours , t STO & SAMPSON ENGINEERS, INC. K-5John A. Hume Manager Construction Services Ei T/JAH: kag (B-14as3 ) Y { Weston & Sampson Peabody.iulassuchusetls0}91r0-7985 � 'E 'N G , fi IV E E H - , f N C . ' Tol: (508)532-190d Fax;M8)9-17.0 fUi E�rv#ru:r�rrerr��r!C'uf�sra�frrfafs share 189 k August 2 , 1991 Mr. ' . , Robert Nicetta i Building inspeet6r, * ' Division of ' Planning and Community Development 10 Fain Street 1 North Andover, MaGsachusetts 01845 � S Re , North Andover WTP Lake Bottom Dear Mr. lcetta : This letter supplements the July 17 , 1991 letter to Fir. Jauies Gordon - concerning : the bottom elevations ' of the lake (copy attached) . The July 17r, 19 1 letter describes the results of our . Survey of the lake bottom .iD front of the plant. ' As requested, we, have enclosed prints of drawings U3 , U7a, and U8 ' from the water treatment plant project which show the 'informatiQn obtained by th4~ surv8 . We have noted on U7a the contours of the lake bottom in ,the area of the plant as surveyed In JIAIY of 1991 . We have also- superimposed the shoreline profile from ,U3 on U7a. } on drawing US we have shown the bottom contours of the lake � along the intake that were obtained durirtq Qonstr"ction prior to the installation of the intake pipeline in October of 19€ 8 . If you have any questions , 'or need any additional information, prase contact us . f Very truly yours, WESTON & SAMPSONENGINEERS, INC . ; ?ames. F. Finegan, P . E.. Project Manager cc: M. 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