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CLACKAMAS <br />C UNTY <br /> <br />May 5, 1997 <br /> <br />Department of Transportation & Development <br /> <br /> THOMAS J. VANDERZANDIEI~I <br /> DIRECTOR <br /> <br />Scott Andrews <br />Columbia Sand & Gravel <br />PO Box 1039 <br />Camas, WA 98607 <br /> <br />SUBJECT: <br /> <br />Sand Filter Media <br />Columbia River Sand & Gravel <br /> <br />We are in receipt of the sieve analysis dated May 5, 1997 for Columbia River Sand & <br />Gravel filter sand. The sand meets minimum D.E.Q. specifications for "medium sand" for <br />sand filter construction with the following conditions: <br /> <br />ho <br /> <br />The approval is good for 90 days. <br /> <br />Future tests shall indicate the ASTM test methods used.' lfthe ASTMs are not on <br />the analysis, I won't be able to approve it! <br /> <br />Please feel free to contact me should you have questions. <br /> <br />Sincerely, <br /> <br />Building Section <br /> <br />WHD:tp <br />cc: Soils Staff <br /> <br />902 Abernethy Road · Oregon City, OR 97045-1100 · (503) 655-8521 · FAX 650-3351 <br /> <br /> <br />