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The scope of services we will perform for this phase of the project is outlined below: <br /> Perform a reconnaissance of the project site and mark out proposed boring locations. We will <br />also contact Texas811 prior to exploration. <br /> Provide a dozer (or hydro ax) with operator to clear pathways to some of the boring locations. <br /> Drill, log, and sample seven exploratory borings at the selected site. The borings will be drilled <br />with an ATV-mounted drilling rig equipped with straight flight augers and rotary wash equipment <br />to depths of about 25 feet each below the existing ground surface (bgs). The borings will be <br />covered to take measurements of the water level after 24 hours. Two of these borings will be <br />converted to piezometers after completion of drilling. <br /> Collect geotechnical soil samples continuously to a depth of 20 feet and at 5-foot intervals <br />thereafter. Samples will be taken using conventional split-spoon and/or thin-wall tube sampling <br />techniques for laboratory testing and analysis. <br /> Perform laboratory testing that will generally consist of moisture content, No. 200 Wash, <br />Atterberg limits, double hydrometers, crumb, and strength testing. We will also perform two <br />Consolidated Undrained (CU) Triaxial Compression Tests. <br /> Prepare a geotechnical report presenting the results of our evaluation. The report will be sealed <br />by a Professional Engineer licensed in the State of Texas and will include the following: <br /> Description of work scope, laboratory, and field procedures; <br /> Maps (including published faults in project vicinity) and boring plans; <br /> Boring logs and laboratory test results; <br /> Subsurface soil and groundwater conditions; <br /> Excavation characteristics of onsite soils; <br /> Dewatering recommendations; <br /> Earthwork recommendations, including OSHA soil classifications; <br /> Design recommendations for detention basin side slopes and liner (if needed). <br /> Slope stability analysis to evaluate allowable side slopes using estimated parameters; and <br /> Erosion and slope paving recommendations. <br />ASSUMPTIONS <br /> The site is accessible to ATV-mounted drilling equipment and site access will be granted. <br /> We are estimating approximately three days of clearing will be needed to access the boring <br />locations. <br /> The boreholes can be backfilled with soil cuttings from the drilling activities. <br />2 <br />Ninyo & Moore | Willow Springs Bayou (B112-00-00) 100 ac-ft Detention Pond ILA Project, La Porte, Texas | 16-01103 | August 17, 2021 <br /> <br />