1720 121ST ST SE 2016-01-01 MF Import

� CASCADE GEOTECHNICAL March 9, 1989 Job No. 892-22G Gustavson Construction Page 3 CONCLUSIONS AND RECOMMENDATIONS The uncontrc�led fill anc] peat observed throur;!:out the north half of the site is not normally useable as a roadway subgrade. Unacceptable settlement and distress to the pavement surface would be expected if the roadway were placed on the existing subgrade. In order to eliminate the possibliity of roadway settlement and distress due to the uncontrolled fill and peat, the unsuitable material should be removed and replaced with structural fill. Based on our telephone conversation with thc owner/developer Bill Gustavson, we understand that the road will be private. We under- stand that the owner/developer aill accept the risk of roadway settlement and distress and will place the road over the peat rather than removing the unauitable soil and replacing it with structural fill. Therefore, we are providing recommendations which are intended to reduce roadway settlement and distress rather than eliminate it. It appears that the south end of the roadway and the cul-de-sac will be placed on firm nonorganic soil, and no special procedures will be required; however, recommendations for construction are provided. Subarade Preparation I We recommend that the portion of the roadway to be placed over the uncontrolled fill and peat be drained of standinq water, I stripped of vegetation then proof rolled with a heavy vehicle such as a loaded dump truck. Soft areas observed during proof rolling should be dug out and replaced with structural fill. We recommend Ileaving the uncontrolled fill otherwise undisturbed. We recommend