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elevations for drainage structures present. The supplemental data will be used in conjunction <br />with the aerial mapping to create a single topographic map that will be used as the basis for <br />design. <br />Sewer Manhole Details, and Water Valve Locations — Invert elevations will be obtained for <br />sewer manholes present in the alignment. In addition, the top of valves nuts will be observed <br />for water valves present in the alignment, if accessible. Based on preliminary investigation, this <br />effort may include up to 40 sewer manholes, and 50 water valves. It is anticipated that the <br />manholes and valve covers will be accessible and that the measurements can be safely obtained <br />with minimal traffic control. Coast Surveying will work with the Cities of Santa Ana and <br />Newport Beach to ensure that traffic control requirements are met prior to initiating this <br />effort. <br />Existing Right_ -Cf -Way Base Mao — Research, analysis, and mapping will be performed to <br />retrace the centerline and rights -of ways within the project area. The result will be a Right -of- <br />Way Base Map illustrating existing centerline and right of way conditions. Existing centerline <br />monuments combined with available agency research and assessor parcel mapping will be used <br />to prepare the Base Map. This will not be a full and complete boundary survey of the right -of- <br />way and adjacent land parcels. Monuments located will be limited to those along the street <br />centerline. <br />4.6 Geotechnical Investigation — <br />4.6.1 Geotechnical Recommendations Analysis - URS will conduct a geotechnical review of <br />existing geotechnical information prepared for the original construction of the Santa Ana <br />Delhi Channel and the construction of the existing public right of way for the proposed <br />pipeline alignment (currently assumed to be as described by South Bristol to Campus, and <br />along Campus to MacArthur) to provide an existing records review as to adequacy of <br />existing information to prepare updated geotechnical design recommendations. Based on the <br />adequacy of the existing information, URS will prepare a letter report providing <br />requirements for additional geotechnical investigations and /or design recommendations to <br />be utilized as part of the final design. In the event that existing information is not available <br />or deem inadequate, URS will provide recommendations as to the extent of additional field <br />investigation required to provide the needed geotechnical information as described in Tasks <br />4.6.2 and 4.6.3 for the final development of a Geotechnical Report. <br />4.6.2 Optional Geotechnical Field Investigations — Santa Ana Delhi Channel — URS will conduct <br />geotechnical field investigations for the Santa Ana Delhi Channel that include the following <br />field operations: <br />a) Drill and sample 2 borings (hollow stem auger and rotary wash) maximum depth <br />will be 30 feet below ground surface or refusal. These borings will be adjacent to <br />the existing concrete lined channel within the proposed improvement area. All <br />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 soil/mud in drums since rotary wash method will be used. <br />J) 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 />25F3356 <br />