Laserfiche WebLink
<br />City of Everett – Replacement of Reservoir 3 16 Scope of Services <br />3. Plan Geotechnical Field Exploration Program. The Consultant shall plan and coordinate <br />the geotechnical exploration program for the project. The exploration program will <br />consist of drilling a series of borings to provide data for evaluating the proposed <br />improvements. <br />4. Site Reconnaissance and Utility locates. The Consultant shall visit the site to evaluate <br />the site conditions, locate exploration locations and call in the Utility Notification Center <br />and a private utility locate subcontractor. The Consultant will make additional site visits <br />to verify that the proposed locations of the borings are clear of utilities prior to finalizing <br />the exploration plans and mobilizing the equipment. <br />5. Develop a Subsurface Exploration Work Plan. The Consultant will prepare a Subsurface <br />Exploration Plan memoranda for the proposed exploration program. The work plan will <br />be submitted to the design team and City for review and approval. The work plan will <br />detail the type, location, and extent (depth, sampling interval, in-situ testing, and <br />instrumentation installation) of proposed field explorations along with logistics necessary <br />to perform the work such as traffic control plans and staging areas. The work plans will <br />also be used for utility locating clearances and for permitting that may be necessary to <br />access the exploration locations. <br />Field Explorations. The results of the site reconnaissance, review of data provided by <br />the City, and visual evaluations will determine the locations of field explorations. These <br />explorations will be performed where mutually agreed with the City. Drilling has been <br />budgeted based on an estimated 4 borings. 2 drilled to 75 feet deep along the property <br />line south of the site for the anticipated deep excavation. Monitoring wells will be <br />installed in these two borings to evaluate groundwater conditions and provide <br />dewatering recommendations for the anticipated deep excavations. The two other <br />borings will be drilled to 80 feet deep near the center of the south proposed reservoirs. <br />Borings will be advanced with a hollow-stem auger, trailer-mounted drill rig operated by <br />an independent firm working under subcontract. Throughout the drilling operation, soil <br />samples will be obtained at 2 ½- or 5-foot depth intervals by the Standard Penetration <br />Test procedure (ASTM:D-1586) or similar method. After drilling, each hole not used as a <br />monitoring well will be backfilled with a mixture of soil cuttings and bentonite, and then <br />the surface will be temporarily patched with quick drying concrete. Monitoring wells will <br />be installed in the 2 borings. <br />6. Generate Boring Logs and Assign Laboratory Testing. The Consultant shall prepare <br />summary boring logs and conduct laboratory testing to evaluate relevant physical <br />properties of the site soils. These tests will include moisture content, grain size <br />distributions, direct shear, hydrometers and/or Atterberg Limits as deemed necessary <br />and appropriate. <br />7. Conduct Groundwater Monitoring. The Consultant shall install groundwater monitoring <br />transducers in each monitoring well (including the existing 3 monitoring wells on site) at <br />select depths. These transducers will be set to take groundwater elevation readings <br />every half an hour for up to one year. Three site visits are included to download and <br />process the groundwater data. This data will be used to provide the designer and <br />prospective contractors with seasonal groundwater variations across the site. <br />8. Evaluate Field and Laboratory Data. Based on the borings and the laboratory test results <br />of selected samples, the Consultant will estimate soil/rock parameters needed to <br />evaluate the effects the subsurface conditions will have on the proposed improvements.