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<br />Truck trip generation <br />The purpose of this study is to determine the impact of truck traff c from the Castle Rock Quarry <br />operation on Douglas County roads. The amount of truck traffic generated is directly related to <br />the volume of sales. In this situation we refer to eleven yeazs of sales records on the Ditmars <br />' operation from both Centennial Materials and the previous owner. <br />During this discussion, we will be talking about number of trucks and volume of sales. It is <br />' important to define a few terms at the beginning. Rhyolite from the Castle Rock Quarry <br />operation will be sold by the ton. Therefore, ow discussion of sales volume will be in tons. <br />Trucks are counted in both "loads" and "trips". A load is a loaded truck leaving the site for <br />delivery to a customer. A trip is any truck leaving or entering the site. Therefore, one load <br />generates two truck trips. The terms load and trip are both used in this discussion and it is <br />' important to note which term is being used. <br />Table 3.H.4(1) is a compilation of eleven yeazs of sales data. This data is based on copies of <br />' sales tickets for every transaction. The sales ticket indicates the date of the sale and the tons of <br />material pwchased. The Ditmars operation is a year-round operation and ships approximately <br />245 days per yeaz. The top row indicates eleven years of data from 1984 to 1994. The lefthand <br />' column is broken down into 12 months a year followed by totals per month in each year. The <br />highest yeaz of sales was 1985 when 123,265 tons of material were shipped. The lowest year of <br />sales was 1989 when 39,981 tons of material were shipped. <br />' The fow bottom rows of the table give specific information about the operation on a per year <br />' basis. One of the rows indicates the average number of loads leaving the quarry on a daily basis <br />in that year. The average load was about 12 to 13 tons which is a three axle, ten fire truck. <br />At the Ditmars operation, a very busy day would be over 40 truck loads sold. The last row in the <br />table indicates how many days in each of the eleven years this occurred. <br />' Table 3.H.4(2) is a calculation of the average sales volume based on the eleven years of data. <br />The Table gives average monthly sales, average loads shipped per month, and average loads <br />shipped per day. In Table 3.H.4(2), the average annual sales were 75,665 tons, with 24 truck <br />' loads sold each day. <br />This data from the Diunazs operation is an accwate representation of what will happen at the <br />' Castle Rock Quarry operation, Based on this data, we predict that an average sales year for the <br />Castle Rock Quarry will he 80,000 - 100,000 tons. The maximum sales year will be similaz to <br />' 1985 and we predict 125,000 tons sold and 34 loads per day. <br />1 <br /> <br /> 24 <br />' <br />