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4. Some concrete chunks of the removed coping. bond beam, and swimming pool shell <br />were placed along the bottom of the swimming pool to be used as a layer of free- <br />drainage-materials. <br />5. The regular soil fill materials generally consisted of yellowish bror,m silty fine sand <br />with traces of clay. were placed in thin lifts. added water by using a water hose. and <br />compacted to 907o relative density by using a Bobcat and a hand-held vibratory <br />compaction plate. <br />Conclusion: The demolition and backlilling of the pre-existing swimming pool is <br />considered geotechnically acceptable and suitable for the intended use for landscaping/ <br />non-structural purposes. <br />Note: If a structural objeot such as a room addition is to be constructed at or near the <br />swimming pool backfill area in the future. a qualified geotechnical engineer should be <br />consulted and a soil report should be prepared for provision of geotechnical <br />recommendations for foundation design. <br />If you have any questions or required clarification. please contact this office. This <br />opportunity to be ol service is sincerely appreciated. <br />Very truly yours. <br />Lan N. Pham. P.E. <br />Chief Geotechnical Engineer <br />RCE 686. exp.03/31/19 <br />d] <br />$R 6? <br />i <br />0r <br />q q <br />=a <br />CA LIT <br />"z.rr'* <br />& se, <br />^ <br />t'\e. <br />-,<\ <br />^ <br />) <br />\