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Mr. William B. Sands <br /> Director of Public Works <br /> City of Decatur <br /> RE: DeWitt County Well Field Expansion <br /> August 10, 1990 <br /> Page 3 <br /> Please note that we have used a 724 ton quantity of gravel pack <br /> versus the Bid Schedule of 480 tons. This quantity is our <br /> estimated amount using the true hole volume of the annulus between <br /> the 42" hole and 20" casing/16'� screen. Since the 42" hole is most <br /> certainly going to be a much larger diameter due to the nature of <br /> the Reverse Rotary Drilling Method, we utilize a factor safety of <br /> 2. 0 in computing this estimated quantity to compensate for the <br /> irregular hole. <br /> Item No. 8, Furnish and Install Test Pumping Equipment, needs to be <br /> clarified in that we have used a quantity of seven (7) for the six <br /> (6) wells. The extra unit is included to cover the need to set a <br /> temporary lineshaft pump in Well No. 3 for the water supply on <br /> drilling the initial well, Well No. 5. Following the drilling of <br /> Well No. 5, the test pump would remain in the previous well for the <br /> drilling of the subsequent well. <br /> The City has expressed a desire to furnish the 20" and 16" casing, <br /> 16" stainless steel screen, and acid-resistant gravel pack. If <br /> this were the case, we would delete these items and add an hourly <br /> rate of $253 . 50 per hour straight time ($328.25 per hour for <br /> overtime) for our equipment and a crew of three men to compensate <br />' us for an work related to the handlin delive and unloadin <br /> Y , <br /> g rY g► <br /> and installation of said materials. In other words, any work <br /> related to Items 4, 4a, 5, and 6 would be performed on a time and <br /> material basis with our compensation at this quated hourly rate in <br /> addition to a cost plus 25� basis for any incidentals, �uch as <br /> welding equipment rental, stainless steel welding rods, casing pipe <br /> ears, etc. <br /> While the City could potentially realize some cost savings in <br /> furnishing the three major material items, there are other factors <br /> involved that may offset any potential cost savings. These are: <br /> 1. There would be labor costs (mentioned above) that would need <br /> to be considerec� in your analysis of the cost savings. It is <br /> difficult to estimate the time and material work involved for <br /> us, should we perform the work on a "labor only" basis. We <br /> would estimate that this could come in anywhere between <br /> $35, 000.00 - $45, 000.00. <br />