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