Square yards

Roads and Walkways The cost of roads and walkways in chemical plants is difficult to estimate, since these vaiy with type of construction and thickness of applied cover. Some typical unit costs for roads are as follows For 305-mm (12-in) gravel base covered with 76-mm (3-in) asphalt, the cost is 17.10 per square meter ( 14.30 per square yard) for a reinforced concrete slab with a 152-mm (6-in) subbase, the cost is from 28.40 to 35.10 per square meter ( 23.80 to 29.30 per square yard), depending on the thickness of concrete (for M S = 1000). 

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Areal Variation. One objective of the sampling comparison studies was to determine the variation in TCDD concentration over a small area to estimate the error associated with a grab sample concentration. Accordingly, a one-square-yard area was selected adjacent to a previously sprayed road. The center of the test area was about 6 feet from a sprayed road shoulder. This one-square-yard area was divided into nine one-square-foot areas. Using clean spoons and knives, a single scoop was collected from the center of each one-square-foot area down to a depth of 2 inches. The data are presented in Figure 1. 

The data In Figure 1 show wide variations In the nine single samples collected In a one-square-yard area from a depth of 0 to 2 Inches The low value was 8 1 ppb, and the high value was 57 ppb, with a mean concentration of 37 9 ppb For practical purposes, a one-square-yard area represents an extremely small point In relation to the size of most sites, and In routine sampling any point within the area would have an equal likelihood of being sampled Using the nine values, one can arithmetically calculate a number of mean values by taking all possible combinations of the reported values up to 9 at a... 

A uniform requires 4 square yards of cloth. To produce uniforms for 84,720 troops, how much cloth is required ... 

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