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Conduct laboratory tests of selected samples to evaluate moisture content, density, <br />gradation, Atterberg limits, consolidation, shear resistance, expansion, R- value, soil <br />corrosivity, and /or other criteria as recommended by the geotechnical engineer. <br />Prepare a geotechnical report presenting findings, conclusions, and <br />recommendations for the design and construction of the proposed facilities. The <br />report will include, at a minimum: <br />1. Groundwater presence and levels; <br />2. Construction dewatering requirements; <br />3. Pipe bedding requirements; <br />4. Trench shoring requirements; <br />5. Settlement potential; <br />6. Excavatability of soils; <br />7. Backfill suitability, and <br />8. Backfill compaction. <br />The geotechnical report will emphasize specific concerns regarding construction <br />methods and the integrity of the Santa Ana Delhi Channel and structures. The <br />report will provide recommendations regarding the design of facilities. At a <br />minimum, recommendations will include: <br />1. Active, at -rest, passive and dynamic earth pressures; <br />2. Foundation type; <br />3. Allowable bearing pressure; <br />4. Coefficient of friction between the foundation and sods /subgrade; <br />5. Foundation design data; <br />6. Settlement potential; <br />7. Pipe bedding; <br />8. Maximum cut slope requirements; <br />9. Structural needs; <br />10. Groundwater dewatering well(s) design criteria, and /or <br />11. Other standard design criteria. <br />URS will provide five (5) copies of the draft Geotechnical Investigation Report (GIR) for <br />the City and stakeholders review. Upon resolution and incorporation of review comments, <br />five (5) copies of final GIR and one (1) electronic copy in PDF (single file) on CD will be <br />submitted. <br />4.6.3 Optional Geotechnical Field Investigations — Force -main Pipeline Alignment - URS will <br />conduct geotechnical field investigations for the Force -main Pipeline Alignment that include <br />the following field operations: <br />a) Drill and sample 8 borings (hollow stem auger and rotary wash) maximum depth <br />will be 15 feet below ground surface or refusal. These borings will be adjacent to <br />the proposed pipeline alignment within the shoulder area of the public right of way. <br />All boring locations will be located subject to permit guidelines. <br />b) Collect samples every 5 feet alternate SPT and California samples. <br />c) Groundwater will be located based on the surface control of the boring site. <br />d) Perform hand auger upper 5 feet. <br />e) Collect the soli /mud in drums since rotary wash method will be used. <br />f) The borings will be backfilled with bentonite slurry to abandon the borehole after <br />measuring the groundwater in the borehole (if encountered). <br />g) URS will obtain boring permits and call USA digalert before drilling. <br />h) URS will arrange traffic control and drum disposal. <br />tM 25P457 <br />