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OCLACKA AS <br />COUNTY <br /> <br />August 20, 1992 <br /> <br />Department of Transportatlort & Development <br /> <br />W. H. Christner, Plant Supt. <br />Canby Sand & Gravel <br />PO Box 269 <br />Canby~ OR 97013 <br /> <br />SUBJECT: SAND FILTER MEDIA APPROVAL <br /> CANBY - SAND & GRAVEL <br /> <br />The sieve analysis by Carlson Testing, Inc., dated August ls, <br />1992, of material from Canby Sand and Gravel, i~ found to meet <br />minimum DEQ specifications for "medium sand" used i~ the <br />construction of sand filter systems. Material approval is <br />granted for a period of 90 days. <br /> <br />Your cooperation in this matter is greatly appreciated. <br />have questions or need further information, please feel <br />to contact our office. <br /> <br />If you <br />welcome <br /> <br />BERNIE J. DUFFY - Soil scientist <br />Building Service~ Division <br /> <br />/krb <br /> <br />CC: <br /> <br />Bill Doak <br />Larry Olander <br />Karen Livingstone <br />Dick Polson <br />Sand Filter Installers <br />File <br /> <br />902 Abemethy Read · Oregon City. OR 97045-1100 · (503) 655~8521 ', FAX 650-335~ <br /> <br /> <br />