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Home My WebLink AboutADDENDUM 1 - 2023 Sanitary Gatewells Ph II - FINALAECOM ADDENDUM NO. 1 AECOM 501 Sycamore Street Suite 222 Waterloo, Iowa 50703 www.aecom.com 319-232-6531 tel 319-232-0271 fax FY 2023 SANITARY SEWER GATEWELL REPAIRS PHASE II WATERLOO, IOWA AECOM #60549334 DATE: November 1, 2022 BIDS CLOSE: November 3, 2022; 1:00 p.m. TO ALL BIDDERS ON THE ABOVE PROJECT: All bidders submitting a bid on the above Contract shall carefully read this addendum and give it consideration in the preparation of their Bid. I. GENERAL INFORMATION: 1. Gatewells 3C-2 and 5D-1 are to be lined as indicated on the plans. Additional information regarding the liner is detailed below: a. Surface preparation shall be per NACE No. 6/SSPC-SP13 Joint Surface Preparation Standard for the Surface Preparation of Concrete. b. Prime Coat: 6-8 wet mils of Polyurethane Concrete Primer (Chem Prime CP, Carboline, PolyQuik primer or engineer approved equivalent). c. Finish Coat: 100 mils of Polyurea Coating (Chemline ARC, Carboline, PolyQuik P-480 or engineer approved equivalent). d. Testing: After lining, the coating will be tested using high -voltage holiday detection in accordance with NACE RPO-188-99. Detected holidays shall be marked and repaired. Touch up and repair procedures will follow the lining manufacturer's recommendation. II. REVISIONS TO SPECIFICATIONS 1. Specification Section 03 30 00, Cast -In -Place Concrete. Please change D.1. on page 03 30 00-13 to read "Concrete quality testing will be performed on the concrete by independent testing agency retained and paid for by the Contractor." III. REVISIONS TO DRAWINGS 1. On Drawing No. 2, add the following as General Note 32: "32. Pipes to be abandoned within the levee must be completely filled with flowable mortar per Army Corps of Engineers requirements." AECOM ADDENDUM NO. 1 FY 2023 Sanitary Sewer Gatewell Repairs — Phase 11 Waterloo, Iowa November 1, 2022 Page 2 2. On Drawing No. 20 (attached), see clarification of 12" pipe. 3. Drawing No. 26 shows a pipe on the side of the manhole at 90 degrees. This pipe is to be 12" diameter. IV. Any revisions to any of the Contract Documents made by this Addendum shall be considered as the same revision to any and all related areas of the Contract Documents not specifically called out in this Addendum. V. Attachments: 1. Drawing No. 20 VI. The Bidder shall acknowledge receipt of this addendum by inserting the date and number in the spaces provided on page FB-2 of the FORM OF BID OR PROPOSAL. Please be reminded that failure to acknowledge any and all addenda in the appropriate spaces on the FORM OF BID OR PROPOSAL could cause your submittal to be considered invalid. Ross Hillsman, PE AECOM L:\Legacy\Projects\60549334\500_Deliverables\503_Gatewell Ph II\PH II Addendum 01\ADD 1 - 2023 Sanitary Gatewells Ph II.docx i PLAN NOTES O ,:...... ...... _ `' ', I�1-INCH VERIFY SCALE IF PLAN SHEET IS REDUCED f N N M o N N N o 0 41 1. INSTALL 8 LF 12"0 DI PIPE WITH 45° BEND ON EFFLUENT PIPE. EXISTING 42" STORM APRON #2 CEDAR RIVER J J u EXISTING SANITARY EXISTING STORM • EXISTING SANITARY MH 3 EXISTING STORM GATEWELL E-3 GATE VALVE 3E-1 GATEWELL 3E-2 EXISTING 24" EXISTING SANITARY EXISTING 48" STORM APRON #10 GATE VALVE 3E-4 STORM APRON #6 --_1_.- - -- _ __--_-------- - ---- --- 12" WATTLES EXISTING STORM GA EXISTING -- ------._ GATE VALVE �- -- - _- _1 EXISTING SAN MH 21514 - - - � SANITARY 48" @ 0 06% _ �. - - -� _ - - - - VALVE - - 48�a 3E-0 GATE cn m cn m ° Z oz w o BID SET DESCRIPTION - - 0.06% PROPOSED SAN GATEWELL -______ _- _ 3E-6 - % 1 _ _ - - BIKE TRAIL _ _ - - - o .__--OF ��--__-- ....SAN MH 3 I �- - APPROXIMATE6 / RONT C\� /OoSANMH2 __ S \ EXCAVATION LIMIT RNERFEMENS / _ wPSERI _ - _ _ _ SANMHI--------- _ _ _ - - APPROXIMATE s ` _- , EXCAVATION LIMITS _= n _ .. • • , - - EXISTING. ORM . f .. - 12" WATTLES MANHE#3 EXISTIN EXISTING STORM GE DRAIN #G AREA ASE - MANHOLE#4 f + MENT 901,0 GEOR -r-. W -�_ • fF :. tam coEVEC Jr L n a "RY $ • MH 1TING ' + F _ ( M JD DRIVE !� .... • AERIAL SOURCE: BLACK HA ' - :: • +• IA - RIL 121 TOE OF LEVEE O` G�� 0 PSE R O _ - _ _----_`___---- _�: _ 1` ----- _, I EXIST! I STORM EXISTING AR RAIN #9 PNO f 3 SAN ,,,_> STORM MANHOLE EXISTING; RICPMENGOO EOU MH 4 - - SAN MH\5 - _ " _ I #8 I 'STORM ARE 7- FAA1N# i ----- I __ F NE`SO pERRV,MPR. EXISTING ATE VALVE \ - _ = - _ jSAN1MH7 N, - Olio -- - SAN 3E 5 _ - - -=ma., i CCU 0 p0 P� RV pROV \M C O _ _ _ - - _ - - 1 _ __ _ --'� g a' SAN r _ 3EFFREy F NR i MIDWEST PATTER V] ANY _ W ° ° = a a A=COM 501 Sycamore Street, Suite 222 Waterloo, Iowa 50704-1497 T 319.232.6531 F 319.232.0271 W W W.AECOM.COM - HORIZ. 0' 25'...50' 100' j I + I t 1- I I + 1 I I -I I I LJtt I I I V1RT. _it= I-O'- SCALE 20' I I i I t I I- 1 I + I + I -1 I I + I I -SAN MH-5 - I I --, j t I 1 1 1 1 1 1 N 3,6 E 5,235,068.75 1 S4N M 7 (6070) 1 AN MH 2 (4 "0) I II 1 1 ,585.87, II R M EL 846.12 N 644, 88.92 E 5,2 6,064 37 860 SAN MH L 1 (48"19) ' 3,644,962.9 , E 5,235,466.91 SAN 'MH 3 (48"0) I IN EL 831.94 (SW EXIST 6") RIM EL 846113 860 + - - -I - IN 3,645, - '-RIM EL 78.82) E5,2:5,236.60 2,50-1 - - - - 1- I - t - - 1 - -1 - ITRIM EL 846.76 - - (SW . 12")- -1 - -I - - N 3,644,839.74, -RIM Et 84116- E 5,235,659.64 + - - I - - I- - - - I - - - - I - - - I t INV EL NV-EL 831.24 -.14 (NW 89 ff} 12" INV EL 1 -1 836.15 (SW R -=-8" - - i_ - - - _1_ ___I_- _SAN M�6_(481d)_1- - F.Y. 2023 SANITARY SEWER GATEWELL REPAIRS -PHASE II CITY CONTRACT NO. 1071 CITY OF WATERLOO, IOWA GATEWELL REPAIR DETAILS 3E-0, 3E-1, 3E-2, 3E-4, 3E-5 & 3E-6 I 1 I INV EL 8 5.19 (1SW 1 ,INV-EL834.16 'INV EL 834.06 (NWT .- 12" I INV EL 833.04 (NW�)12" - SAN MH14 (48' o I (SE I 1 1 "), N 3,644,397 54, E g,236,255.46 INV EL 8 5.09 (SEff�12 I INV EL 833.96 (SE•8.112" INV F 832 •41. F : 12' N 3 644 g55.35 E 52 910. 0 5 ( RIM L 843.21 aL 850 _ 4- _ - - _ t ` - _ - _- - - - - - - - . 1. EXISTING 42"0 S �} I _ + J _ EXISTING SAN TARYSBN/ER- - GRADE - - OVER -- - - - - INV -EL -- EL \ RIM 831.7d EL 840 (NW (SE it 12" '.'12" - - y l Il ! _ - - J - 7 fXISTIVG 4b' 0 1 INV 832.20 INV EL 831.68 _,� (SW 6") (NW 8") 850 840 APPROXIMATE EXCAVATION LIMITS YY- L 1 I 1 j 1 III I - I I I I I 4 - j - j I 1 I STORM I I r A PPR 840 OX4E _ _ + - 1 t - o ,_ I 256.9 Lfr 12"0 DI PIFIE AT 400% � LIMITSEXCAVATION LIMITS 830 - 229.6LF12"0DI PIPE ATD400% 311.p LF 12 0 DI PIPE AT 0.4p0 /a J 90��■�..� J� LF12"0DI IPET0.4 % 13 .2 LF 12"0 dI PIPE AT 0. 00% �( J -PROPOSED SAN GATEWELL 3E-0 1114.6 LF 8"0 DI PIPE AT j 0.400% I 830 I 1 1 1- I-- 1 1 I I I I I ' N 3,644,567.23, EL 852.00 NM E 5,236,059.27 - GENERAL NOTES j - - j -1- - - - + - - - j -1 - - - - I- - - - j fi - - - -I- - - - I t - -E-XISTINGSANIMH-21-514 I I I EL 830.19 I INV EL 830.09 + + 1 (S 12") (N 12") - SAN MH7(60"Or - + - - - 1 I 1. SEE LEVEE RECONSTRUCTION DETAIL 2 ON DRAWING 3 AND LEVEE RECONSTRUCTION NOTES DRAWING 2. CONTRACTOR I I 3,644,607.52, E ,236,053.83' Li 1 I I'I r _ _ i 1 \ 1 I SEE ABOVE I 850 - :: MAY NOT EXCAVATE BEYOND THEON L LIMITS OF EXCAVATION SHOWN ON THE DRAWINGS. SHORING MAY BE REQUIRED + TO1LIMIT EXCAVATION. ALL COSTSASSOCIATED IV1TH- - - I CREATING AND MAINTAINING AN OPEN EXCAVATION FOR INSTALLATION ARE CONSIDERED INCIDENTAL--TO--THE PROJECT.--- - -1- - - - - + - - I.... - - I- - 1 - - - - - - - 1 - - - + - I I V NV EL 827.6' INV Et 827:6T(SE 1 I (NW X EL 820.93 EX 1: (S ST-48" 48') 12" )' )I I i 1, s - 1 ' 1 } -1- - , I... " - - + -1 EXISTING GRADE OVER SANITARY SEWER - -- - -- -- - -- -- -- - 850 - - - 840 - - 1 + IF FIELD CONDITIONS DICTATE THAT THE PROPOSED SLOPES FOR EXCAVATION ARE NOT POSSIBLE CONTRACTOR IS REQUIRED TO INSTALL SHEET PILING TO LIMIT EXTENT OF EXCAVATION. 1 1 - - 1 - -. 1 -. - - 1 -. - - 1 - 1 1 1 EX I APPROXIMATE AVATION L I MITS 1 / / i./ `-1 ` L 1 _ 4 - } - I -840 APPROXIMATE - - EXCAVATION LIMITS DATE OC TOBER 2022 PROJECT NO 60549334 4Y I 830 -- I- - - 2. DOWNSTREAM PIPING FROM EXISTING GATEWELLS 3E-1, j 3E-2, 3E-4, 3E-5 AND 3E-6 WILL BE ABANDONED BY FILLING WITH PLOWABLE MORTAR. --I-- 1 : 1 - 1. . 1.... I I I 1 I I I 1 1 CORE WITH I 1... / 1 DRILL MODULAR I AND 1 SEAL SEALI I -830 \_ 78.5 LF 12"0 DI PIPE AT 0.400% 40.6 LF 12"0 DI PIPE AT 0.400% FILENAME 10-C-020.Dgn SHEET NO DRAWING NO 20 820 -820