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Home My WebLink About6. Isabella Area Sewer ImprovementsCount Prospect AM?) Mount Prospect Public Works Department INTEROFFICE MEMORANDUM TO: VILLAGE MANAGER MICHAEL E. JANONIS FROM: DIRECTOR OF PUBLIC WORKS DATE: APRIL 3, 2014 SUBJECT: ISABELLA AREA SEWER IMPROVEMENTS PROJECT The 2011 Comprehensive Flood Study Report identified several sewer improvement projects for areas subjected to severe, recurrent, and geographically concentrated flooding. The first phase of these improvements (Phase 1 Improvements) involved storm sewer improvements on SeeGwun Avenue, NaWaTa Avenue, Lawrence Lane, Hatlen Avenue, Hatlen Court, Busse Road, Michael Street, Verde Drive, Bonita Avenue, and Audrey Lane. The Phase 1 Improvements also included ditch regrading and culvert replacement work in the Golfview Estates residential subdivision. This work was facilitated by $2.5 million in short -term debt issued in 2012. All of this work was designed and constructed in 2013. The second, and final, phase of public sector work identified by the 2011 Comprehensive Flood Study is the construction of a relief sewer system in the Isabella Street residential area. The proposed scope of work for this project includes the installation of approximately 6,600 linear feet of relief sewer ranging in size from 15" to 96" (and appurtenances) to provide a 25 -year recurrence interval level of protection for approximately 800 single - family homes. Funding for this work has been facilitated by $10 million in general obligation bond debt. Last fall, staff proposed to construct the Isabella area improvements during the 2014 construction season. It was our opinion that constructing the improvements as a single, large, comprehensive project, instead of smaller, phased improvements instituted over 2 or more construction seasons, is the most cost effective, beneficial, and least disruptive course of action. The Village Board concurred with this assessment and authorized a design engineering contract that would facilitate project design during winter 2013/2014 and bid letting in spring 2014. It was anticipated that construction would start in late spring 2014 and reach final completion by November 2014. Unfortunately, the unusually heavy and consistent snow cover this past winter prevented timely completion of survey work and field data collection necessary to complete bid documents. As a result, the project is not yet ready for bidding. It is presently the opinion of staff that we have missed the window of opportunity to bid and construct this project as a single, comprehensive effort during the 2014 construction season. Page 2 of 2 Isabella Area Sewer Improvements Project April 3, 2014 Staff has considered subdividing the scope of work and constructing the improvements in phases. To this end it remains feasible to construct a portion of the work this year with the remainder slated for completion in the 2015. This phased work would be delineated by construction method. More specifically, the tunnel- boring work would be completed in one phase (Phase 1), and the open excavation work would be completed in another (Phase 2). The attached documents graphically depict the proposed scope of work for each of these phases. However, construction of the improvements as a single, comprehensive project remains the preferred approach. Already this year, we have noted that underground utility construction bid prices have increased 5 % -10% over 2013 costs. As a consequence, it is feasible to anticipate that costs for a Phase 1 project let for bidding later this year could be higher than estimated because contractors already have substantive workloads. Additionally, although design engineering costs would not increase, fees for construction engineering would certainly rise due to the fact that phasing of the work would likely require additional inspection time. Staff expects that this cost could be substantive (at least six - figures). Therefore, it is the recommendation of staff to modify the schedule for the Isabella Area Sewer Improvements to facilitate the work during a single construction season: 1. Site Survey Complete — May 15, 2014 2. Easements - June 30, 2014 3. Design 60% Complete — July 15, 2014 4. 60% Review (VOMP) — August 1, 2014 5. Design Complete (90 %) — August 31, 2014 6. Review (VOMP) — Sep 30, 2014 7. Permitting — Sep 1 to Oct 30, 2014 8. Design Complete (100 %) — Oct 30, 2014 9. Bidding — November 2014 10. Award —January 2015 11. Construction — Start in March 2015 Appropriate staff will be in attendance at the April 8, 2014 Committee of the Whole meeting to provide additional details and facilitate discussion. Attachments: Exhibit 1 Exhibit 2 Cc: Deputy Director of Public Works Jason Leib Village Engineer Jeff Wulbecker Water /Sewer Superintendent Matt Overeem Project Engineer Matt Lawrie P. Dorsey R 11 12 3 10 no.l a.l. I O da I aesorip0aR NORTH i — EXISTING 90'COMBINEO SEWER EXISTING S9' RELIEF SEWER )PER RUN PLAN DATED JUNE 1983) s . IPER RUN PUN DATED JUNE 7893) 29 SANITARY SEWER EASEMENT (T'P) (PER TITLE SURVEY DATED APRIL 2012) 30 DRAINAGE EASEMENT(TYP) 0100 (PER TITLE SURVEY DATED APRIL 2012) \ 9.0' D MWRD DROP SHAFT — (PER MSD PLAN DATED AUGUST 1975) PERMANENT EASEMENT(TYP, (PER MSD PUN DATED AUGUST 19)5) ., I Y 1 PROPOSED BUIL ON CHAMBER E XI ST ING M JUNCTIONCHAMBER ERTO ACCOMMODATEPROPOSED90'RCP \ COMBINED SEWER Ae EXISTING M A D (PER MSD PLLAN N DATED AUGUST 197 19]5) RIGNT40E- WAY(TYP)— ! \ PERMANENT 19]5) (PER MSD PLAN DATED AUGUST 79]5) EXISTING 48' COMBINED SEWER p._.. PROPOSED 24' X 15' JUNCTION CHAMBER ji. (PER MSD PLAN DATED AUGUST 19]5) EXISTING 76'CIA MWRD DEEP TUNNEL (PER MSD PLAN DATED AUGUST 19]5) YM i O MSD DATED AUGUSEWEfl ^ ,f (PER MSD PLAN DATED AUGUST IWS) PROPOSED 90'COMBINED SEWER X0.04% Z (REMOVE EXISTING 80' COMBINED S F DOWNERS -CI E S LITE 400 830 -]24 -3200 LICENSEE NO 1M.001310 kI\ MARCH 2014 J. PATTERSON esi 9ne� c e� J. PATTERSON R. JAYARAMAN (PER MSD PLAN DATED AUGUST 1815) V PROPOSED BB' RELIEF SEWER A 0045% 0 %S AP y 5 �. g PO� k � '. Cook Country, Illinois 20141SABELLARELIEF SEWER Y + PHASE I pra,e4 I caMiac, ]5539 d—g rev. EXHIBIT 1 4heel , of i sheets �c 1 3 B 6 t 2 3 s B 7 a p 10 11 12 Is 14 NORTN dsacriptlon 9 c D E IF 1431 OPUS PLACE SUITE 490 DOWNERS GROVE, IL 69515 93(4724-3209 H LICENSEE NO. 194=310 does a.a44p MARCH 2914 J.PATTERSON esipnc� G cM1ecketl J. PATTERSON R. JAVARAMAN ,tww4 , I Gook Country, plincis 20141SABELLA RELIEF SEWER PHASE II project I conVact ]6539 aro�4ne r... EXHIBIT 2 t j1pland Ava St 41 4 1 4040 I m Q m L IS' 1`* Jay a0 N 00 _ ao O N N I 3 rr _t rV Ln 4 0 41 1 z - N 0 hrst�ar S I Vt Life ollege I 'S v CONNECT TO MWRD C G Q m O' I �!� �„ INTERCEPTOR Q c) N :'! L]Ir s`� Jt�' .Jt N s 4�-�j ' Jt LEGEND _ 6 - EXISTING COMBINED SEWER - RELIEF SEWER I I m 48 "0 66 "0 66 "0 72 "Qf 84 "0 =. 90 "0 96 0 W 96 0 96 "0 9 _ I N •, D - PHASE L9 lSl ID 0 6l p o Q 0 in M N N N M N OQ N m St Tha r SI E T r St E '" U St I 0 l9 lA l4 g aD 2 z N N en cD m I 3 o l C N 92 Busse Parry a w t He Sr N � E Henry & - 1 E Hen z ° z ` CL D �^ Mt Pro ec N cq 0 3 W Central Rd E w. Rd N I E Central PHASE II CONSTRUCTION (YEAR 2015) dsacriptlon 9 c D E IF 1431 OPUS PLACE SUITE 490 DOWNERS GROVE, IL 69515 93(4724-3209 H LICENSEE NO. 194=310 does a.a44p MARCH 2914 J.PATTERSON esipnc� G cM1ecketl J. PATTERSON R. JAVARAMAN ,tww4 , I Gook Country, plincis 20141SABELLA RELIEF SEWER PHASE II project I conVact ]6539 aro�4ne r... EXHIBIT 2