2408 RAVENNA ST 2016-01-01 MF Import

, � �, ' Consultation Letter Planned Short Plat Road and Detention Sy.tem Everett,Washington May 16,2000 NCA File No.2594B00 Page 4 bucket should be used in excavating these soils. A bed of pea gravel or manufacturer approved bedding material should be used under the pipe. Dewatering of the trench should be expected. The lower sand found in our exploration would be expected W "run" into the excavation if it is extensive in depth. Special dewatering, such as wells or well points, may be naded in orda to comp!ete this excavation. We recommend that test pit explorations be completed prior to starting pipe installation to determine if dewatering weUs are nxded to complete the pipe insffiIletion. Depending on t6e conditions exposed at the outer portion of the road embankment, some geogrid within the fill may be needed. This will have to be determined based on conditions observed in the pipeline excavation and the finel depth of fill in this erea. It may be that the pipe excavation will remove enough materiel in the alignment causing the road section W be tltick enough W not need grid. Spalls may be needed to establish a firm surface before plecing the road embaol�ent fill. USE OF THIS REPORT We have prepared this roport for use by the Tredway Corporation and the'v designers, for use in designing a portion of this projxt T6is ropoR is based on limited exploration date end verification of actual conditions in the field during construction will be required. Because of t6e expected variations in subsurface c�nditions,we do not consider the need for additional explorations nxded at this time. Our analysis of the conditions is baud on engineering judgement and experience with these types of materials. We have not completed a rigorous analysis of the soil pipe system. We do not consider that appropriate for these conditions,as they ere highly variable in both sUength and spatially. Within the limits of scope schedule and budget, we have strived to complete our services within the accepted state of the oractice. No other conditions,expressed or implied should be understood. 000 � NELSON-COWRETTE 8 ASSOC/ATES, INC.