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<br />--- <br /> <br />5. Bids for Trap Rock <br /> SPECIFIC <br /> CXXw1PANY UNIT PRICE GRAVITY TOI'AL <br />N.B. West Contracting Company $13.25 2.87 $8,943.75 <br />Iron Mountain Trap Rock Company 13.50 2.62 9,112.50 <br />Breckenridge Material Company 30.00 2.65 20,250.00 <br /> <br />The Street Division requires the maximum volume of trap rQCk per ton <br />available to the City. In order to better analyze bid prices, a conver- <br />sion formula has been devised by the Public Works Department using an <br />average bulk specific gravity of 2.90 and the unit price increased or <br />decreased by 0.21% for each 0.01 that the specific gravity exceeds or <br />falls below the 2.90 base: <br /> <br />1 - [(2.90 - specific gravity) x 100 x 0.0021] x unit price = volume unit <br />price <br /> <br />Iron Mountain 1 - [(2.90 - 2.62) x 100 x 0.0021] x 13.50 = $12.7062 <br />N. B. West 1 - [(2.90 - 2.87) x 100 x 0.0021] x 13.25 = $13.1165 <br />Breckenridge 1 - [(2.90 - 2.65) x 100 x 0.0021] x 30.00 = $28.425 <br /> <br />A price canparison per ton is: <br /> <br />1984-85 1985-86 1986-87 1987-88 1988-89 1989-90 1990-91 1991-92 <br /> <br />$12.39 $14.50 $14.25 $14.50 $12.90 $12.00 $13.50 $13.50 <br /> <br />I recoomend accepting the bid from Iron Mountain Trap Rock Canpany in the <br />amount of $9,112.50. Inasmuch as the total exceeds $5,000, Council <br />approval is require. <br />