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per inch in P-9 at 0 feet to approximately 4 minutes per inch in P-9 at 3 feet over a 60- <br />minute period. Based on this data, we believe Mesa County Health Department may <br />not require a registered engineer septic system design. <br />Lot 20, TP-10: P-10 at 0 and 3 feet <br />Subsurface conditions consisted of 11 feet of sandy clay with clayey sand / <br />gravel lenses noted. No free groundwater was encountered. We estimate a high <br />seasonal groundwater level of 6 feet depth. The nearest identified water source was a <br />natural drainage (dry at the time of our visit) approximately 40 feet northeast. The sandy <br />clay and the clayey sand /gravel were tested. The tops of the percolation holes were <br />approximately 0 and 3 feet below the ground surface. Measured percolation rates <br />(Figs. 15 and 16) averaged approximately 7 minutes per inch over a 60-minute period. <br />Based on this data, we believe the Mesa County Health Department may not require a <br />registered engineer septic system design. <br />Lot 2. TP-11: P-11 at 0 and 3.5 feet <br />Subsurface conditions consisted of 9 feet of sandy, gravelly clay. No free <br />groundwater was encountered. We estimate a high seasonal groundwater level of 6 <br />