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1 <br /> 2 Traffic shall not be permitted on the finished concrete until it has reached a minimum <br /> 3 compressive strength of 3,000 psi as verified by rebound number determined in <br /> 4 accordance with ASTM C805 and the longitudinally sawn texture is completed. <br /> 5 <br /> 6 6-09.3(1)B Rotary Milling Machines I <br /> 7 This section is revised to read: <br /> 8 <br /> 9 Rotary milling machines used to remove an upper layer of existing concrete overlay, <br /> 10 when present, shall have a maximum operating weight of 50,000 pounds and conform <br /> 11 to Section 6-08.3(5)B. <br /> 12 <br /> 13 6-09.3(1)C Hydro-Demolition Machines <br /> 14 The first sentence of this section is revised to read: <br /> 15 <br /> 16 Hydro-demolition machines shall consist of filtering and pumping units operating in <br /> 17 conjunction with a remote-controlled robotic device, using high-velocity water jets to <br /> 18 remove sound concrete to the nominal scarification depth shown in the Plans with a <br /> 19 single pass of the machine, and with the simultaneous removal of deteriorated concrete. <br /> 20 <br /> 21 6-09.3(1)D Shot Blasting Machines <br /> 22 This section, including title, is revised to read: <br /> 23 <br /> 24 6-09.3(1)D Vacant <br /> 25 <br /> 26 6-09.3(2) Submittals <br /> 27 Item number 1 and 2 are revised to read: <br /> 28 1 29 1. A Type 1 Working Drawing consisting of catalog cuts and operating parameters of <br /> 30 the hydro-demolition machine selected by the Contractor for use in this project to <br /> 31 scarify concrete surfaces. <br /> 32 <br /> 33 2. A Type 1 Working Drawing consisting of catalog cuts, operating parameters, axle <br /> 34 loads, and axle spacing of the rotary milling machine (if used to remove an upper <br /> 35 layer of existing concrete overlay when present). <br /> 36 <br /> 37 The first sentence of item number 3 is revised to read: <br /> 38 <br /> 39 A Type 2 Working Drawing of the Runoff Water Disposal Plan. <br /> 40 <br /> 41 6-09.3(5)A General I <br /> 42 The first sentence of the fourth paragraph is revised to read: <br /> 43 <br /> 44 All areas of the deck that are inaccessible to the selected scarifying machine shall be <br /> 45 scarified to remove the concrete surface matrix to a maximum nominal scarification <br /> 46 depth shown in the Plans by a method acceptable to the Engineer. <br /> 47 I 48 This section is supplemented with the following: <br /> 49 <br /> 50 Concrete process water generated by scarifying concrete surface and removing existing <br /> 51 concrete overlay operations shall be contained, collected, and disposed of in <br /> WEST MARINE VIEW DRIVE UTILITIES PAGE 21 OF 60 August 2018 <br /> WORK ORDER#3588 <br /> WSDOT AMENDMENTS Rev 4/2/18 <br /> I <br />