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feet depth. The nearest identified water source was the canal more than 200 feet <br />northwest. The sandy, gravelly clay was tested. The tops of the percolation holes were <br />approximately 0 and 3.5 feet below the ground surface. Measured percolation rates <br />(Figs. 17 and 18) averaged from approximately 4 to 5 minutes per inch. Based on this <br />data, we believe the Mesa County Health Department may not require a registered <br />engineer septic system design. <br />Lot CZ, TP-12: P-12 at 0 and 2.5 feet <br />Subsurface conditions consisted of 2.5 feet of sandy clay underlain by sandy, <br />clayey gravel to the maximum depth explored of 9.5 feet below the ground surface. No <br />free groundwater was encountered. We estimate a high seasonal groundwater level of <br />6 feet depth. The nearest identified water source was the canal approximately 300 feet <br />north. The sandy clay and sandy, clayey gravel were tested. The tops of the <br />percolation holes were approximately 0 and 2.5 feet below the ground surface. <br />Measured percolation rates (Figs. 19 and 20) averaged approximately 4 to 5 minutes <br />per inch over a 60-minute period. Based on this data, we believe the Mesa County <br />Health Department may not require a registered engineer septic system design. <br />