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625 Cypress Avenue Geotechnical Investigation Project No. W1895-88-01 - 30 - April 23, 2024 7.11.8 It is recommended that vertical point-loads, from construction equipment outriggers or adjacent building columns use horizontal pressures generated from NAV-FAC DM 7.2. The governing equations are: 𝐹𝐹𝐹𝐹𝐹𝐹 𝑥𝑥𝐻𝐻�≤0.4 𝜎𝜎𝐻𝐻(𝑧𝑧)=0.28 × �𝑧𝑧𝐻𝐻�2 �0.16 +�𝑧𝑧𝐻𝐻�2 �3 × 𝑄𝑄𝑃𝑃𝐻𝐻2 and 𝐹𝐹𝐹𝐹𝐹𝐹 𝑥𝑥𝐻𝐻�>0.4 𝜎𝜎𝐻𝐻(𝑧𝑧)=1.77 × �𝑥𝑥𝐻𝐻�2 × �𝑧𝑧𝐻𝐻�2 ��𝑥𝑥𝐻𝐻�2 +�𝑧𝑧𝐻𝐻�2 �3 × 𝑄𝑄𝑃𝑃𝐻𝐻2 then 𝜎𝜎′𝐻𝐻 (𝑧𝑧)= 𝜎𝜎𝐻𝐻(𝑧𝑧)𝑐𝑐𝐹𝐹𝑐𝑐2 (1.1𝜃𝜃) where x is the distance from the face of the excavation/wall to the vertical point-load, H is distance from the outrigger/bottom of column footing to the bottom of excavation, z is the depth at which the horizontal pressure is desired, Qp is the vertical point-load, σH(z) is the horizontal pressure at depth z, ϴ is the angle between a line perpendicular to the excavation/wall and a line from the point-load to location on the excavation/wall where the surcharge is being evaluated, and σH(z) is the horizontal pressure at depth z. 7.12 Stormwater Infiltration 7.12.1 During the site exploration on March 4, 2024, borings B2 and B3 were utilized to perform percolation testing. The borings were excavated to approximate depths of 5 and 25 feet below ground surface. Slotted casing was placed in the borings, and the borings were then filled with water to pre-saturate the soils. On March 5, 2024, the casings were refilled with water and percolation test readings were performed after repeated flooding of the cased excavation. 7.12.2 Based on the test results, the average infiltration rate (adjusted percolation rate) is provided in the following table. The field-measured percolation rate has been adjusted to infiltration rates in accordance with the County of Orange Technical Guidance Document for the Preparation of Conceptual/Preliminary and/or Project Water Quality Management Plans