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DR9301-CS 920521From : ALBERT HRLFF PHONE No, : 739 0094 0ot. 16 1992 3:04PM P02 ALBERT R. HALFF ASSOCIATES, INC. ENGINEERS ' SCIEN'rI~'r.~ · SURVEYORS DA1,LAS · AgLINGTON * CHICAGO* FORT W~RTH May 21, 1992 City of Coppea :255 PanK'w&y ~ouleva~d Coppell, TX 75019 A~tn; Ken Grlf~n, p.rt., Oty F.,n~ineer Re: Pha~e 1 Dtalna~ Projects Dcar Ken: Aa n:qucstod, wc mc provid/n§ a summ~ (see A~c~t A) o~ the eu~ent ~s~m~, of P~ble ~n~mtcfi~ C~t ~ur ~o ~ons~cflon pl~s cu~nfly ~S M~a~m~.t (SWM) 9mdy, ~ ~ sevo~ ~nnong for theee incases: Recent construction price increases Unit ]n4c~s udlta~d in th~ SV~M Study arc from fit© City of Dallas Public Works Dopa, h,mnt ~murt~tly Stolid Prims - January 2, 1991. These arc bnsed on 1990 conzU'uctlon proj~ts. Uzflt prloos hnvo in~roascd sllghfly (<5%) oyes' the past yam'. Size ofproject$ - Rc~nt small ch'ainag~ improvement p~ects itl ~ OW of ~e9 ~vc ~iv~ ~t pri~ bids hi~ &~ ~u t~i~l or av~ City of ~ ~S. ~s ~ to ~ ~m~ily ~an~ ~ ~e ~ ~ ~c p~ts ~ ~e l~aflon of ~c work, ~,, w~k p~ ~ exis~ng ~ndal s~vial~ts. Final design brought to light tnany utility cro$$1n8~ and/or relocatiot..~ which were not sufficiently accounted for In the SWM Study - Th~s i~ ~n & ]~blern in rcmcdlatton work such as dxls, especially ~,* x~dent~l subd~¥isi0ns whe~ existing ultltttcs arc not profiled nnd lntHvldual s~rvlcc incntions m~t Ix= vcrJficd, where possible, '.tn dm field. lo addition, we have also found that in some axcas such a~ Sandy Knoll/Shadowcrcst and Sandy Knoil/Woodhurst, the d~si~n surv~ys showed tha~ more parturient should bc rcplaoad then was oP,~inmily bud~ted. Original d~slgn slopes on this su*e~t w~ 0.50 pareent. Subsequent pavomont movmntmts have flat~n~d or revorscd thcs~ slopes in many ar~as causing l~nd~l wat~S~/qM~ made it di/~cult to dc~hic cxucfly whcrc to end th~ ncw pavemmtt The construction plans p~vlously submitted include replaccment of approximately 100 linear feet of ALBERT H. HALFF A~OCIATES~ INC. ENGINEERS · ~'I~N?IST$ ' SURVEYORS City of Col~ll Ma~ 2t, 1992 Pa~ 2 paYement on /ihadowc$~.st Dine and 1~0 £cct o, W~hLtrst ~vc. ~1~ S~ ~tud~ c~ for ~0 fc~ and 1~ f~, ~pectlv~ly. oMy ~ fl~c ~cas wh~ actu~ ~'~mS~ ~mpl~ h~ ~n loggY. Ropl~m~nt of thc ~]cy cnu~nco on of Sm~y ~IoH ~ W~t w~ not Pavcmcnt rcplaccmcnt includcd in thc prcviously submitted construction plans cxtcadc, d 50 £~;t L~:yo/td thc i.~A;tioJ~ ~£ Sm]dy ~noH l~s d~an 0.~. Two mMltlonal pavc,~nt ~placcmcnt W~st D~vc. ~at ~s~matcs m'~ showa on At~chmcnt A. Option 2 is r~mmcnd~ ~cuu~ of thc l~gc poadcd re'ca ~ tim ~ast lcavca a pav~cnt slope of 0.18% at t}t~ Io o~y bund ~c Sh~owc~st I~nc ~nago tm~vcmcnts at rids at $46,~. ~v~m~}~ ~ W~t ~ ~n ~ fund~ at a la~ da~ through ~e ci~'s pon~g ~uu ~ ~ h~sm~ in fl~e int~hn p~l~ All cost cSrlmntx~s aro 'also attlwhcd to dlis lct~' for yo~ ~. Wc app~a~ ~i~s ~ ~o ~d mbs aa th~ ~j~ts go und~ conU-act. It is always h~pf~ dds hfforll~gon for f~ proj~ts. Plme feel ~ to call if you have any questions or COmrr~ntS, Upon yOUr apgaxavttl, wo will ~ tho Sandy Kaoll plans and cont/nu© tho Meadows Stage I and II submittals. Yours v~ truly, ALBF. RT H. HALI~ AiiSOCIA'riiS. INC. C!l~un Hanaen, p. Fl. From : ALBERT HALFF PHONE No. : ?59 0094 0ct. 16 1992 3:05PM PO~ &TTACH~NT A SUMd~I&ItY OF ~'~4~'I'RD COIqI~TRuCTION COffIS P~8~ 1 ~.~&Ol~ IMPaOV~MRNT PItO.,'ECT~ Ci~Y 01~ COI~.L. TRXAS City-Wide Storm .... Ma~-~-~ StudyI Current Bstlmate From Co~stmctioa Plans Sandy ICaolVShsdowcrest - Stile I $22.fh'10 Basc op~ ~ ~,~ Sturdy Knee.mt'st Opgon 2 $~,~ t'av~nt $t9.~ S~o~t Only ~,~ Me~ows Su~n - M~dows Su~vision - Stage lI $150,~ $184.5~ B~ks ~e - ~ I ~a Oidy ~t A~li~ Not A~lle~le t F..stimatc includes on~in~rin§, conuact admlnlstrution, inspection/testing, surveying and Those catimates wore prepared utili~&t& standard cost estimate practices. It is unde~tood and agreed that this is an cstimstc only, and g~at mtSi~eer shall not bo liable to owner or to a gtird party fc~ any failure to accurately esgmatc thc cost of thc project, or any part thereof.