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Glenn Cook <br />Sq>tcmbcr23, 1994 <br />Page 3 <br />Geotechniral Review <br />Based on the [wwent swamp dqwsit thickness, and the relatively high moisture — <br />su^t a ronsid^le amount cf settlement has occurred in the past. We understand' the <br />seSS .^'nitSTa <br />Our scope of scnric»s did not include laboratory consolidation testing of the oreanic soils Inorder to accmately predict settlenrents, several consoUdadon tests wolild ty^ <br />0 swamp deposit vanes. Instead, we conducted water content tests to aid in estimating <br />compresstbiUty. ITierefore, predictions presented herein should be considered rough <br />on the easting road embanlcment being in place for at least 20 years, we «ai-.r. finite <br />settl^^ts of the roadway assodated with secondary consoUdation (^ardkss of grade raise) <br />wuM be on tte order of 2' -I; over the next 20 years. The addition of 2' of ffll rdU^t in <br />«“<* wiU induce additional primary consolidation. <br />We^timate this additional.- ement to be on the order of 3', which may occur within one year <br />B^ on the abwe, estimated long-term settlements due to a 2' increase (both primary and <br />saoi^ , IS ;^>nale<l to be on the order of 5*±. We su^t this type of settlement ’sag* <br />However, you should consider the efiects of <br />Mttlcmcnt on the utilities. Watennam is typicaUy flexible, although the watermain has already <br />likely experiCTced significant settlements. These settlements will also have an effect Cai mic- <br />repported utilitcs, as the soil settling around and above the pile-supported system will experience <br />downdrag or negative load caused by adhesion of the surrounding settling sods. <br />seajement is undesit^Ie, it would be possible to reduce settlements associated with <br />pn^ consohdanon by excavatmg a portion of the existing fiU soils, and replacing tbae heavy <br />“fro-iT~:^rraS^r'“‘”^- >*^‘-»vailabieforeviewdUswithyou