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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />.Simons, Li and Associates, Inc. <br />Job. No. 6143J002 <br />Project: Portland Flume Reconstruction <br /> <br />gravel, cobbles and boulders of medium to high density. Bed- <br />rock was encounted only in Test pit No. 6 at the top of the <br />flume. The rock consisted of light to moderately weathered, <br />moderate to heavily cemented limestone. Maximum particle size <br />generally decreased from the top of the flume to the river. <br />Traces to some clayey fines were encountered in the pits <br />nearest the river while the fine grained material in the re- <br />mainder of the pits was generally non-plastic. The material in <br />all pits was relatively well consolidated. The sides of the <br />test pits remained temporarily stable at slopes ranging from <br />1/2:1 (H:V) to near vertical. However, the test pits remained <br />open for only a short period of time before being backfilled. <br />Test pit depths for this portion of the flume ranged from 9 to <br />11 feet below existing grade. No groundwater was encountered <br />in any of the test pits at the time of this exploration. How- <br />ever, some evidence of seepage was noted in several of the pits. <br /> <br />Due to the granular nature and large particle size of the soils <br />encountered in all of the test pits, laboratory testing was <br />limited to classification tests. The results of the testing <br />program are included in this report. <br /> <br />Headwall Foundations: It has been assumed that concrete box <br />culverts will be used at the roadway crossings. It is further <br />assumed that cast-in-place, concrete head and wingwalls will be <br />constructed at the majority of the crossings. Shallow spread <br />footings bearing upon undisturbed subsoils are recommended for <br />support of these structures. An allowable bearing capacity of <br />3000 psf may be used for footings founded a minimum of 4 feet <br />below lowest adjacent finished grade for frost protection. <br /> <br />Settlements for footings subjected to maximum assumed loading <br />conditions and founded as recommended are estimated to be less <br />than 3/4 of an inch. Additional total or differential settle- <br />ments of 1/4 to 1/2 inch could occur if bearing soils become <br /> <br />-3- <br />