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September 3, 2004 NOA Project Number: E04025A Page 3 highest. The estimate of 11,650 gallons per day water use also assumes full occupancy of the park(all trailer spaces full). The flow numbers discussed reflect the high use period. We would expect the average daily flow number to be less for the rest of the year, possibly about 9,000 gallons per day. Soil Borings and Ground Water Three (3) soil borings were excavated to examine the soil conditions to a maximum depth of 25 feet. Our office logged all three borings and conducted the two (2) percolation tests on July 1, 2004 and one percolation test on July 13, 2004. This work was performed in an effort to determine the suitability of the soils and establish the percolation rate of selected layers in the soil column in an area for a septic disposal field. Sheet 2 shows the percolation test locations. Soil log descriptions are attached to this letter. Essentially, three (3) soil types were identified. The surface layer ( 0 to—9ft) was composed of a dark brown silt followed by silty sand layer to a depth of about 15 ft. Below the silty sand was a layer of silty clay. From a soils standpoint, the silty sandy layer, located generally between the depths of 9 to 15 feet, appears to be the most potentially permeable and suitable soil layer examined. Percolation Test Two percolation tests were performed on July 1, 2004 and one other on July 13, 2004. The percolation test consisted of drilling with a B-53 Mobile Drill, three (3) 12-inch diameter holes to a depth of 25 feet. Within the boring, 5 feet of"pea gravel" was placed in the bottom of the hole and a 1.5 or 2-inch PVC pipe was placed into the boring and pea gravel was placed around the PVC pipe to stabilize the side wall from caving and to prevent erosion while filling the hole. The hole was pre-soaked 24 hours prior to the test. For the presaturation and percolation test, water was filled to a height of 5' from the top of the hole and the fall was observed. The water drop was measured with an electric well sounder tool with an accuracy of 1/100 foot. The percolation rate for P-1 and P-2 was obtained near the 10 foot depth of the hole. The percolation rate for P-2 was measured at the 7-ft depth. The percolation rates were converted into feet per day to determine clear water flow rates (CWR) for a 5 foot diameter seepage pit. The followinYtab ' summaries the results of the percolation test: