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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 />