11632 EVERGREEN WAY BASE FILE 2018-01-01 MF Import

Proposed Retail Dcvclopment J-1443 112�'Succt and Hwy.99 Febwry 26,2004 � Everett,Washington Page 13 foundation components. Alternatively,the frozen material could be stripped from the subgrade to reveal unfrozen soi(prior to placing subsequent lifls of filt �r foundation components. The frozen soil should not be reused as structural fill until allowed to thaw and adjusted to the proper moisture content,which may not be possible during winter months. Construction Dewaterine During the process of overexcaveting unsuitable soils, some dewatering may be necessary. We anticipate that this will be thc case during the removal of the pcat deposits in the building pad. The occurrence of the peat along the west side of the proposed building and the resulting dewatering, if necessary, could lower the groundwater on the adjacent site to the west that supports an apartment building. This could lead to settlements on the neighhoring property that could af�ect the apa�tment building. Other dewatering could be necessary during utility constn�ction. We recommend that pre-bid test pits be completed on the site if up-to-date groundwater information will assist in formulating accurate biJs. The need for dewatering, as well as the typc of dewatcring system used, should be made by the conkactor at the time of construction. Structural Fill All structural fill should be placed in accordancc with the recommenda6ons presented herein. Prior to the placemer.t of structural fill, all surfaces to receive fill should be prepared as t previously recommended in Site Preparation section of this report. Structural fill includes ,�y fill material placed under footings, pavements, or other permanent slructures or facilities. Matcrials typically used for sWcturttl fill include clean, well- graded sand and gravcl ("pit run"); clean sand; various mixtures of sand, silt and gravel; crushed rock; and blast rock. Recycled concrete, if locally available, is also useful for sttuchual fill provided thc material is thoroughly crushed to a well gradcd, 2 to 3 inch minus product. Struclurul fill matcrials should be free of deleterious, organic,or hozen mattcr and should contain no cl�emicals that may result in the material being classified as"contaminated". Structural fill for raising site grades can consist of a combina6on of"common"and"select granular"material. "Sc1ecP' ganular fill should contain less than 5 percent by weight passing the U.S. No.200 sieve, based on the fraction passing the U.S. No. 4 sieve. "SelecP' granulaz fill is recommcnded for use in wet weather conditions, as discussed in the pertinent sections of this report. "Se1ccP' sWctural fill should mcet the requirements of the 2002 WSDOT Standard Specifications Section, 9-03.14(I), for Gravel Borrow and have less than 5 percent passing the U.S. No. 200 sicve. "Common" structural fill should consist of lesser quality, more moisture- sensitive soil, such as on-site glacial ti11 soils. Structural fill should be placed in litts not exceeding 8 inches in loose thiclmess. Individual lifts should be compacted such thut a minimum dcnsity of at least 95 percent of the modified Proctor (ASTM:D-1557) is achieved. The top 12 inches of compactcd structural fill should havc a ma�cimum 4-inch particle diameter and all underlying fill a maximum 6-inch diametcr unless specifically recommended by Ute geotechnical engineer and approved by the J-1443,022604 i 13 '