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Proposal to Prepare a Geotechnical Investigation Report 101h and Flower Park Southeast Corner of 10th Street and Flower Street City of Santa Ana, Orange County, California February 21, 2023 Page 4 Test Procedure After presoak, the borehole will be filled with water to 12 inches above the bottom and the drop in water level in the borehole shall be observed. The following 2 conditions are utilized to determine the time interval between readings. • If water remains in the hole after 10 minutes but drains before 30 minutes, the time interval between readings shall be 10 minutes. • If water remains in the hole after 30 minutes, the time interval between readings shall be 30 minutes. After completion of presoak, the borehole shall be inundated to a level less than or equal to the presoak depth. For each successive infiltration test reading, the starting water level must be at this initial water depth. A sounder shall be utilized to determine the water level during each test. All measurements of water level shall be taken to the nearest 1/8-inch increment. Infiltration test readings shall be conducted a minimum of eight times, or when a stabilized rate of drop has been obtained, whichever occurs first. A stabilized rate is defined as when the highest and lowest readings of three consecutive infiltration tests are within 10 percent of each other. The average of the stabilized rate over the last 3 consecutive test readings shall be used as the pre -adjusted infiltration rate. Attempts will be made to remove the pipe from the borings. If the attempts fail, the pipe will be abandoned in place and the hole backfilled with soil cuttings. Task 4: Laboratory Testing Laboratory testing will include, but may not be limited to, the following. • In -situ moisture and dry density • Soils corrosivity • R-value • Collapse • Expansion Index • Sieve analysis • Maximum density • Direct shear Task 5: Engineering Analyses and Report Preparation Data obtained from the borings and the laboratory testing program will be evaluated. Engineering analyses will be performed to develop design and construction recommendations that will be presented in a geotechnical investigation report. The report will include the following items: • Project description. ■ Site description. • Discussion on the field procedure used in the investigation. ■ A discussion of the materials encountered in the borings and their measured engineering properties. • Logs of the exploratory borings summarizing the subsurface conditions encountered, and a plan indicating the locations of the explorations. Converse Consultants R.\2023\32\23-32-103 23-32-103 DEA, 10th and Flower Park, Santa Ana (RFP 22-124) \ProposaV23-32-103_pro(01)parks