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I`(M,,,s t t4l'V'71' SfTfAo isru I I tnprtmemeiplp'N Phcwse I ATKINS <br />Oral history and initial visual observations suggest that there is significant <br />movement of the waft of the basin. Asurvey will be performedto determine the <br />exterit, of the any movement in the walls and/or bridges. The remelts of the survey <br />wfli be used in Task 03 as part of thestructurM evaluation <br />a. Survey Set -Up and Implementation <br />The survey will begin with the establishment of 72 Monitoring 1 argets on, 27 <br />different locations around the -tank's outside walls and crossing bridges to obtain <br />horizontal and vertrical positions. The Monitoring Targets will be established at <br />bottom, micidle, top of walls and along the 3 (three) crossing bridges on the top <br />of the tank. 'The Monitoring Targets will be located 3 (three') urnes: full, empty, <br />then full again. <br />b. High— Resolution Scan <br />The slorage tank will be scanned utilizing a High Resolution Laser Scanner to <br />generate a 3-D model to capture existing the tank's features for use in evaluating <br />any movement and in facilitating the design of any recommended structural <br />repairs. The scan will be conducted through the utifization of a combination of <br />robotic totaJ stations, first -order digital level with a bar. -coded INVAR rod, Fixed <br />SicanningTechn6logy and RTK GPS. <br />c, Survey Details <br />A list of specific tasks and location of the Monitoring Targets associated with this <br />survey are included in Exhibit B. The survey, is anticipated to take up to 10 working <br />days. <br />Task 03 Structural Component Evaluation and Data Collection <br />a. Staff Interviews <br />The objective of the staff interviews is to determine whatthe goals and objectives <br />are, for this structure. Discussions will include a review of the structure's historic <br />and current function, IR 's risk tolerance, future use(s), and long ­term anticipated <br />design life. <br />b. Review of Existing Records <br />Corim.01tant will prepare a data request 'to obtain and.review readily available <br />information including asbudt drawings of the ditches and history of any <br />nriaintenance or upgrades associated with the structural components of the <br />ditches, calct,dations, or past reports prepared for these structures... <br />c, Structural inspection and Evaluation <br />Cloinsultant will visit site to perfoirm a non destructive structural evaluation of <br />oxidation ditich structure and associated Ibridge structures. The goal for irisplection <br />is to visuafly observe and dociument condition of the structures aind record arty <br />defects observed duriing iinspection. Photographs will be 'taken f,:)f defects <br />observed during inspection for areas that can be safely accessed during time of <br />inspection. The record of defects will be used as a baseline for ciiarriparison in the <br />IQ <br />