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<br />SP86-009 <br />Printing Enterprises, Inc. <br /> <br />- 9 - <br /> <br />March 24, 1986 <br /> <br />will exist, consideration may be given to leaving the organic <br />materials in place. All fill placed in parking lots and dri- <br />veways, should be compacted to a minimum of 90% of modified <br />Proctor densi ty. In truck drive areas, the upper 3 feet should <br />be compacted to a minimum of 95% of modified Proctor density and <br />in car parking areas the upper foot should be compacted to a <br />minimum of 95% of modified Proctor density. These compaction <br />requirements also apply to installation of utilities. <br /> <br />Final grades are not known at the time of this report. Raises in <br />grade in areas of deep compressible soils (such as the north <br />parking lot) may result in significant amounts of long term <br />settlement. If raises in grade are planned, we suggest that the <br />fill be placed well in advance of bituminous pavement to reduce <br />the amount of settlement which will Occur after paving and the <br />amount of pavement maintenance required. <br /> <br />Boring B-15 was performed in the proposed truck parking area. <br />This boring encountered 1/2 foot of topsoil underlain by clayey <br />sand. The clayey sands encountered beneath the topsoils are con- <br />sidered fair subgrade soils. In truck drive areas, a 3-inch <br />bituminous mat, a 6-inch base course, and an 8-inch aggregate <br />subbase course is recommended. For car parking areas, a 2-inch <br />bituminous mat over 6 inches of aggregate base should be used. <br /> <br />To evaluate the subgrade after grading is performed, we recommend <br />that all parking and driveway areas be proof-rolled with a loaded <br />dump truck prior to the placement of the bituminous. Soft areas <br />observed during the test roll should be subcut and brought back <br />up to grade with a suitable compacted backfill. <br /> <br />lORIIUD'j <br />