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2019-041
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Last modified
12/27/2019 12:18:06 PM
Creation date
3/7/2019 3:39:26 PM
Metadata
Fields
Template:
Official Documents
Official Document Type
Work Order
Approved Date
03/05/2019
Control Number
2019-041
Agenda Item Number
8.L.
Entity Name
Andersen Andre Consulting Engineers
Subject
Geotechnical evaluation services at NOrth Relief canal stormwater treatment facility
Universal Low Energy Aquatic Plan System (ULEAPS)
Area
66th Avenue and 53rd Street
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PROPOSED UNIVERSAL Low ENERGY AQUATIC PLANT SYSTEM (ULEAPSTm) <br />NORTH RELIEF CANAL - 66m AVENUE AND 53AD STREET <br />AACE Proposal No. P19-1256 <br />Page -2- <br />We understand that this system will be operated by either A) pumping 10 MGD continuously or B) <br />pumping 10 MGD over 12 hours and then turning the pumps off at night and allowing the water to <br />remain in the basins until the next morning where the cyde is then repeated. <br />As part of the system design, it is desired by IRC to estimate the seepage losses that would be expected <br />for the 12 -hour resting period of the system. As most of the system will be encased with concrete slabs <br />and HDPE -lined berms, only the un -lined Final Settling Basins and the Wedand Polishing Marsh, as <br />well as the un -lined berms separating the system from the NRC, will be subject to potential seepage <br />losses. Further, slope stability of existing and new berms may be investigated (to be determined). <br />FIELD EXPLORATION PROGRAM <br />Proposed Field Work <br />Based on our understanding of the project, on our experience with similar projects, and on our <br />experience with the soils in the general site vicinity, we propose to perform the following field <br />exploration program: <br />• Eight (8) Standard Penetration Test (SPT) borings (ASTM D1586) to depths of about 25 feet <br />and two (2) SPT borings to depths of about 60 feet below the existing ground surface. <br />• Ten (10) hand auger borings (ASTM D1452) to depths of 5-7 feet below the existing ground <br />surface. <br />• Two (2) temporary well nests, each with up to 3 temporary 2 -inch diameter PVC wells screened <br />at different elevations. The number of wells per nest and the well screen depth intervals will <br />depend on the encountered soil conditions. These wells will be utilized for field soil <br />permeability testing so as to explore the permeability of the subsoils at select levels, for use in <br />our seepage analysis. Preliminarily, we anticipate installing the wells to depths ranging from 5 <br />to 30 feet, depending on encountered soil conditions. <br />• Complete up to four (4) double -ring infiltrometer tests (ASTM D3385) to ascertain the <br />unsaturated vertical infiltration rate. <br />• Obtain samples for a suitable laboratory testing program to aid in the determination of prudent <br />engineering properties of the levee soils for use in the stability and seepage analysis. <br />General Notes <br />All field work will be completed using truck -mounted drill rig(s), support trucks, and related equipment <br />and materials. All borings will be backfilled following their completion, and all temporary wells will be <br />removed once field permeability testing has been completed. The number of borings and wells, as well <br />as depths, are estimated based on our experience from similar projects. Should the encountered soil <br />conditions prove to be more homogeneous than anticipated, less borings and possibly shallower borings <br />may be utilized, resulting in overall cost savings. Alternatively, if highly variable soils are encountered, <br />we may recommend that additional borings and/or wells be installed. <br />
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