24. Provide clean-outs at appropriate locations for future maintenance of the <br />drainage systems. <br />25. Discharge by gravity flow into the nearest storm drain. If necessary, <br />discharge the water into a common sump and pump it into the nearest <br />storm drain. <br />Subgrade Preparation and Pavement Construction (Wet Weather) <br />We typically recommend that subgrade preparation and pavement construction be <br />delayed until dry weather. If pavement construction occurs during wet weather, <br />the subgrade will likely be too wet for compaction or to support construction traffic <br />without a thickened base rock section. The recommendations provided below for <br />subgrade preparation and pavement construction assume wet weather conditions. <br />We should be contacted to modify these recommendations if dry weather is <br />anticipated. <br />26. Strip the existing ground as required to remove roots and sod or <br />unsuitable topsoil. Dispose of all strippings outside of construction <br />areas. <br />27. Excavate to the required subgrade elevation using a hoe equipped with a <br />smooth bucket. The excavation should extend to the depth required to <br />provide a minimum of 24 inches of base rock. Overexcavate areas that <br />are soft or have been disturbed by construction traffic. Do not expose <br />more subgrade than can be covered with the geotextile and base rock <br />the same day. <br />28. Do not attempt to compact the subgrade. Haul trucks and other <br />construction traffic should be staged from the thickened base rock <br />section or a thickened access ramp to protect the subgrade from <br />disturbance. <br />29. Place a Separation Geotextile on the subgrade that meets the <br />requirements specified above. The geotextile should be laid smooth, <br />without wrinkles or folds in the direction of construction traffic. <br />Overlap adjacent rolls a minimum of 2 feet. Pin fabric overlaps or place <br />the building pad fill in a manner that will not separate the overlap during <br />construction. Seams that have separated will require removal of the <br />base rock to establish the required overlap. <br />30. Place a minimum of 24 inches of base rock under flexible pavement <br />areas. The rock should be end-dumped from a thickened access ramp <br />and spread using a light dozer. The initial ± 18-inch thick lift may <br />consist of Granular Site Fill and the.final 6-inch thick lift may consist of <br />Select Fill. Alternatively, the entire base rock section may consist of <br />Select Fill. <br />Oakleigh Meadows Cohousing February 12, 2013 <br />145 16 Geotechnical Investigation Project 2131004 <br />Eugene, Oregon 11 . Willard C. Dixon Architect, LLC <br />