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oI TORO <br />INTERNATIONAL <br />GEOTECHNICAL EI.IGINEERING <br />June 19, 201 I <br />TI Project No. 17-00.9.2 <br />Mr. Antonio Seja <br />l70l W. 22nd Street <br />Santa Ana, Califomia 92706 <br />Subject: Limited Geotechnical Observation/Testing for Proposed Pool Abandonmenl 1701 <br />W.22nd Street, Santa Ana Califomia <br />In accordance with your request and authorization, we have provided limited geotechnical <br />observation/testing based only on your calls. The limited scope of work consists of <br />observation/testing priorto placement ofbackfill ofthe pool located at 1701 W. 22nd Street, Santa <br />Ana, Califomia. <br />It is our understanding that three holes of4 by 4 feet had been made at the bottom ofthe pool and the <br />upper minimum 2 feet of pool's walls had been removed. The holes were filled with drainage <br />materials consisting of gravel. <br />Compaction was done by wheel-rolling of a small back-hoe (Bobcat) and water was sprayed as <br />necessary. The fill materials consist of brown sandy silt to silty sand. The laboratory test results of <br />the representative soil sample ofthe fill materials indicate that the expansion index is 12, which falls <br />within the very low expansion potential classification according to CBC Test Method l8-2. <br />Based on the laboratory test results of the representative soil sample of the fill materials, the <br />maximum dry density is 105.5 pcf and the optimum moisture content is 8.5 percent. Based on our <br />probing and field density tests, it is our opinion that the fill has been placed in with a minimum of90 <br />percent relative compaction based on maximum dry density performed in accordance with the ASTM <br />D-1557. <br />Therefore, it is our opinion that the backfill for the pool should be sufficient for the intended <br />purposes of pool demolition. Site-specific geotechnical investigation needs to be conducted to <br />evaluate the subsurface soil conditions for future improvements, if any. If you have any questions <br />regarding this report, please call us. We appreciate the opportunity to be of service. <br />Sincerely, <br />TORO INTERNATIONAL <br />ca z< <br />Hantoro Walujono, GE 2164 <br />Principal <br />l LEAGUE # 616"14 tRvlNE, cA 92602 TEL. (949) sss-1s82 FAX. (949) 266-8911 <br />Ilo 11'l-l <br />EXP.3/31/19 t <br />)F OF <br />ES <br />o