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CCP 01-31-1994
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CCP 01-31-1994
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<br /> -- --.- - -----..-.-- <br /> I <br /> AET #93-1379 - Page 13 J <br /> road, particularly in those areas where the sand layer is only l' thick. Also, where sand layer I <br /> thicknesses vary, we recommend subsurface drainage in low points of the thicker areas such that I <br /> water does not become trapped. <br /> We have no information regarding whether drainage lines are included in the granular borrow I <br /> layer below Keithson Drive. No excess moisture or water was noted within the sands during I <br /> driIIing suggesting that water is not building up within the granular layer. You may wish to <br /> research the City's plans (if available) for information on whether drainage lines are present. I <br /> If they are not, additional protection would be achieved by constructing finger drains at low <br /> elevation catch basins. I <br /> CONSTRUCTION OBSERVATION AND TESTING I <br /> The recommendations in this report are based on the subsurface conditions found at our test II <br /> boring locations. Since the soil conditions can be expected to vary away from the soil boring <br /> locations, we recommend on-site observation by a geotechnical engineer/technician during I <br /> construction to evaluate these potential changes. Soil density testing should also be performed <br /> on new flll placed in order to document that project specifications for compaction and moisture I <br /> have been satisfied. Fill soils imported for subgrade use should also undergo sieve analysis <br /> testing to evaluate whether the material meets soil type requirements. I <br /> EXPLORATION PROCEDURES I <br /> Borine: Location/Elevation Data I <br /> Our subsurface exploration program included drilling 13 test borings on the four existing I <br /> roadways. The general locations of the borings appear on the sketches included in the appendix. <br />~~ More specific location information as referenced to existing street centerlines is presented on ~ <br /> I <br />
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