1600 MADISON ST 2016-01-01 MF Import

� Mr. Chris Lark ,,,, February 20, 2001 G.0 CONSTRUCTION CONSIDERATIONS 6.1 SITE PREPARATION AND REMEDIAI. GRADIIVG � Atier demolition of the existing buildings, the sitc preparation should begin with removal of debris, vegetati��n, topsoil, and deleterious matter from the area of the proposed improvements. Undesirable material not suitable for landscaping should be exported from thc site. � Following removal of dclelerious material and rough grading, tlie subgrade exposed beneath the building and pavements should Ue compacted ro a dense and unyielding condition and then (� proof-rolled with a fully-loaded dump truck or a large, self-propelled vibratory roller. In areas �� where very dense glacial till is exposed, proof rolling will not be required. � 1 � N� � We recommend that the proof rolling be observed by our geoteclmical engincer ro identify any so(l, yielding areas lhat may need to be over-excavated and replaced with structural fill. The structural fill should be placed in accordance with tlie compaction criteria presented in Section (_2, below. Areas of existing (to be demolished) or rormer USTs may require local over excavation and backfilling to create a subgrade suitable for the support of the building. Areas that may require such additional work include the former (gas) UST located on the west side of the existing building and thc existing (diesel) UST on the north side of the building (See Figure 2). The diesel UST sliould be removed and replaced with a compacted back6ll before Uie new firc station is constructed. 6.2 STRUCTUItAL FILL AND COMPACTION Structural fill should consist of clean, free-draining granular soils that are relatively free from organic matter or other deleterious materials. The on-site soils contain a significant amount of fines and may be suitable for use as structural fill during dry weather conditions only. Imported structural fill should contain materials no larger than 4 inches and the material should also contain less tUan 7 percent fines (portion passing the U. S. Standard No. 200 sieve). Materials meeting this requirement include Gravel Borrow as specified in Sec[ion 9-03.14(1) of the 2000 WSDOT Standm•d Specifrcntions for Road, Bridge, and Mu�ricipal Consn��ction (WSDOT, 2000). The fine-grained portion of structural fill soils should be non-plastic. A fines content greater than 7 percent, however, may Ue acceptable if the earihwork is performed during relatively dry weather and the contractor's methods are conducive to proper compaction of thc soil. The use of material with a fines content greater than 7 percent should be approved by tlie gcoteclmical enginecr prior to use. 00-04G-100 Geoteeh Report PanGEO, Inc. �3