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g. Filter Press <br /> G. Soundings shall be taken by the Contractor every 20 ft along the trench centerline using a weighted <br /> tape,cable or other device.Soundings shall be recorded to the nearest 0.5 ft. Soundings shall be <br /> performed by the Contractor and observed by the Slurry Trench Specialist.Soundings shall record the <br /> following: <br /> 1. Top of Key, Less-weathered Bedrock Stratum:The top elevation of the key stratum shall be <br /> determined based on an examination of cuttings taken during excavation. <br /> 2. Bottom of Excavation:The elevation of the trench shall be determined subject to approval by the <br /> Engineer. <br /> 3. Bottom of Excavation Prior to Backfilling:Soundings shall be u to monitor for sidewall collapse <br /> and accumulation of sediments. <br /> 4. Profile of Backfill Slope:The SB backfill slope and trenc hall be sounded at the beginning <br /> and end of each shift and converted to an as-built d ing.This ing shall be reviewed daily as <br /> an indication of trench collapse,excessive settle or sloughing. <br /> If profiling prior to the next backfill placement shi dicat dimentation or cave-in has occurred on <br /> the slurry trench bottom or the backfill slope,the m • all be removed by backhoe,clamshell, <br /> airlift pump,or other suitable equipment. is equipm hall be operated in a manner that prevents <br /> removal of material from the walls of the -nch. <br /> H. A qualified off-site laboratory will be engag. by t' rench Specialist to perform the <br /> permeability and strength tests • for in . <br /> I. Flexible wall permeability te- ill be ,nduct on samples of the backfill to determine compliance <br /> with these specifications. ' pies o : bac I will be obtained from the mixing area and will be <br /> sent to the off-site laborato ng. - st parameters will be as follows: <br /> 1. Average Effec ' '•ing s=15 psi. <br /> 2. Hydraulic ' .dient=10 <br /> J. Documentation <br /> 1. Results of all tests • •rmed will be recorded by the Slurry Trench Specialist. Copies of all <br /> Contractor-required quality control documents will be submitted daily to the Slurry Trench <br /> Specialist. <br /> 2. Results of all Construction activities shall be recorded daily on a form acceptable to the Slurry <br /> Trench Specialist.At a minimum,these forms are to include: <br /> a. The project station both at the starting and ending location for each day for the following: <br /> 1) Top of backfill <br /> 2) Toe of backfill <br /> 3) Last completed set <br /> b. Verified area of excavated material <br /> c. Contractors start and stop work times <br /> d. Contractor's activities <br /> e. Set summaries that include: <br /> 1) Start and Stop time for excavation of the set <br /> Loloff Slurry Wall 3156 00-10 <br />