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Proposal to Prepare a Geotechnical Investigation Report 10th and Flower Park Southeast Corner of 10th Street and Flower Street City of Santa Ana, Orange County, California February 21, 2023 Page 3 The borings will be backfilled with cement grout (if ground water is encountered) and soils cuttings and compacted by pushing down with augers. Where asphalt concrete is penetrated, the surface will be patched with cold mixed asphalt concrete. It is possible the surface may settle overtime. If construction is delayed, we recommend the owner monitor the boring site and backfill any settlement or depression that might occur or provide protection around the area of the boring locations to prevent trip and fall injuries from occurring near the area of any potential settlement. Environmental Analytical Testing for Soil Sample One composite soil sample from the excess soil cuttings will be submitted to a California ELAP certified laboratory under chain -of -custody control. All sample analyses will be conducted on a standard turnaround time. The samples will be analyzed as follows: • EPA 8015M — TPH carbon chain speciation • EPA 8260 — VOCs and Oxygenates • EPA 8270 — SVOCs • EPA 8082 — PCBs • EPA 8081A — OCPs • EPA 6010B — Title 22 metals (TTLC) Waste Disposal All excess soil cuttings will be contained in five (5) drums. The drums will be temporarily stored on the site away from drainage areas and secured from unauthorized entry until laboratory analytical results are received. The waste will be profiled for the most cost-effective disposal or recycling option. For budgeting purposes, we have assumed five (5) drums of waste will need to be transported and disposed of as non -hazardous waste. Converse will be responsible for the preparation of waste manifests, and for arranging for proper transportation and disposal of the waste. A Client representative will be responsible for signing the manifests as the Generator. Copies of the manifest will be provided. Task 3: Percolation Testing The purpose of the Infiltration test will be to obtain water infiltration rate of the surface soils at the location of surface runoff discharge. We will conduct infiltration testing at one location. The depth of the infiltration test will be at 10.0 feet bgs. A 2-inch diameter perforated PVC pipe will be installed inside the boring. The pipe will be secured in the borehole and pea gravel filter pack will be poured down the borehole to surround the pipe casing and hole bottom. Water will be added to the borehole until the water level is as near the ground surface as can be achieved and allowed to pre-soak. Pre -Soaking Pre-soaking will be done by inundating the borehole with water for at least one hour. ® Converse Consultants R:\2023\32\23-32-103 23-32-103 DEA, 10th and Flower Park, Santa Ana (RFP 22-124)\Proposal123-32-103_pro(01)parks