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Vincent Wen <br /> From: Patty Buchanan <br /> Sent: Tuesday,April 10, 2018 3:21 PM <br /> To: Vincent Wen; Giancarlo De Simone <br /> Subject: FW: Riverfront Development Grading SWPPP Comments <br /> HWA Landfill Impact Potential Review for inclusion with our comment response. <br /> Patty Buchanan,PE,LEED <br /> Senior Project Manager <br /> 206.436.0515 I DIR 206.436.0522 I CELL 206.399.7462 <br /> From: Donald Huling [mailto:dhuling@hwageo.com] <br /> Sent:Tuesday,April 10, 2018 3:11 PM <br /> To: Patty Buchanan <patty.buchanan@perteet.com> <br /> Subject: RE: Riverfront Development Grading SWPPP Comments <br /> Patty, <br /> HWA has reviewed the proposed grading plan for the stockpiling effort at the Everett Landfill site. The proposed <br /> stockpile elevations are less than the elevations of past surcharging. Therefore,we expect that the stockpiling effort will <br /> not induce additional primary consolidation but will only induce recompression settlement of the subsurface soils. The <br /> recompression settlements are expected to be much less in magnitude than primary settlements observed in past <br /> preloading. We expect that the recompression settlements will result in some settlement of the cement treated layer <br /> and existing perimeter landfill gas collection trenches. We do not believe that settlement associated with the stockpile <br /> effort will negatively affect the perimeter landfill gas collection trenches as they are designed to be flexible and function <br /> under large settlements. We do not believe that settlement of the cement treated layer and landfill cap layer will have <br /> any effect on functionality or compliance of the landfill systems. The grades of the prosed stockpiles where designed <br /> with top slopes that provide sheet flow drainage even with some differential settlements. If differential settlements <br /> were to cause ponding on the surface of the proposed stockpile,we would recommend slight regrading or other <br /> measures to eliminate the ponding. <br /> Feel free to let me know if you have any additional questions. <br /> Thanks! <br /> Donald J. Huling, P.E. <br /> Principal Geotechnical Engineer <br /> um NA GEt&CIENCES[ C. <br /> Certified DBE/MWBE <br /> 21312 30th Drive SE, Suite 110 <br /> Bothell,WA 98021 <br /> Office:425.774.0106 ext. 263 <br /> Cell: 206.794.1515 <br /> www.hwageo.com <br /> From: Patty Buchanan [mailto:patty.buchananPperteet.com] <br /> Sent:Tuesday,April 10, 2018 9:53 AM <br />