1601 N Bristol St - Phase 1 - Plan

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CITY OF SANTA ANA Planning and Building Agency WuTlnGEoR Approved A. G. I. G E O T E C H N I C A L, UMVERMIT ISSUANCE 16555 Sherman Way, Suite A - Van Nuys, CA 91406 - Office: (818) 785-5244 - Facsi ile: (818) 785-6251 Master ID: Date: October 2, 2023 Proj ct No. 32-6235-02 Mr. Amir Houriani 714 S. Plymouth Blvd. Los Angeles, CA 90005 Subject: PERCOLATION TESTING RESULTS Proposed On -Site Storm Water Infiltration System for a Proposed 1-Story Drive-Thru Restaurant Building On -Grade 1601 - 1607 N. Bristol Street Santa Ana, California Reference: GEOTECHNICAL INVESTIGATION AND PERCOLATION TESTING RESULTS Proposed 1-Story Drive-Thru Restaurant Building On -Grade 1601 - 1607 N. Bristol Street Santa Ana, California Prepared by A.G.I. Geotechnical, Inc., Project No. 32-6325-00 dated August 29, 2022 Dear Mr. Houriani: This report has been prepared to present the results of the percolation tests for the proposed on -site stormwater infiltration system, The site is located at 1601 -1607 North Bristol Street in the city of Santa Ana, California and is currently vacant. The location of the site is shown on the Location Map, (Figure 1). The site is bound by North Bristol Street to the west, a vacant parking lot to the north, and by residential and commercial properties to the east and south. Based on review of the Seismic Hazard Zones Map of the Anaheim Quadrangle, the site is located within an area designated as liquefiable. Percolation testing was conducted in two additional test pits. The test locations are shown on the enclosed Plot Plan, (Figure 2). Two test pits were hand dug to a depth of four feet below the ground surface (bgs). A one cubic foot hole (1' x 1' x 1') was excavated at the bottom of each of the test pits. The percolation testing was performed at a depth of four to five feet. The 1 ft3 excavations were pre-soaked, refilled and percolation tests were performed. Recorded water drop rates are shown on the enclosed Percolation Test Reports. The percolation test results show that the measured infiltration rate is 1.0 in/hr and 0.9 in/hr for TP-3 and TP-4, respectively. To arrive at the stabilized infiltration rate, we used the lowest six inches of the water column that percolated in the bottom of the pit. No factor of safety was applied. The upper on -site soils consist of light brown clayey sands in a moist and medium dense condition which are not susceptible to hydroconsolidation. No groundwater was encountered in the test pit to the depth explored of five feet below existing ground surface; however, perched waterwas encountered in our initial investigation conducted on August 3, 2022, at a depth of about 50 feet bgs (See Referenced Report). According to the "Seismic Hazard Evaluation of the Anaheim 7.5-Minute Quadrangle, Los Angeles County, California" dated 1997 by the Department of Conservation - Division of Mines and Geology, historically highest groundwater level has been about 40 feet from the ground surface. The upper on -site soils are sufficiently permeable to allow for the construction of a properly functioning infiltration facility. Engineering Geology - Soil Engineering