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6w <br />February 3, 2006 <br />NOA Project Number:E05171A <br />Page 2 <br />L 2006 using the same rig and augur. The soils in the boring on Parcel 3 were found to be a reddish <br />brown silty sand to a depth of 12 feet, followed by a brown clayey sand to a depth of 25 feet. The <br />soils in the shallow holes were found to be similar to those of the deep percolation test holes. <br />Within the boring, an inch of "pea gravel' was placed in the bottom of the hole to stabilize the <br />side wall from caving and prevent erosion while filling the boring. A 2 -inch diameter PVC pipe <br />with open ends and slots was placed in the hole. About 6 -inches of pea gravel was placed in the <br />annular space around the pipe. The hole was pre-soaked 24 hours prior to the test with 12 inches <br />of water above the bottom of the hole. <br />During the percolation tests, the fall of 6 inches of water was measured above the top of gravel <br />/ during the 4 -hour test period. Measurements were made every 30 minutes for a four (4) hour <br />V period. The percolation tests for Parcel 1 and 2 were performed on January 27, 2006, as well as <br />the shallow test for Parcel 3. The deep percolation test for Parcel 3 was performed on February 2, <br />.. 2006. <br />Table 1. <br />Summary of the Percolation Tests <br />Test <br />Date <br />Boring Depth <br />Duration <br />P-1 shallow <br />1-27-06 <br />3.0 <br />4 -hr <br />50 min/in <br />P -I deep <br />1-27-06 <br />23.7 <br />4 -hr <br />No movement <br />Fa in Pere Rate <br />P-2 shallow <br />1-27-06 <br />3.0 <br />4 -hr <br />atisfactory Pere Rate <br />P-2 deep <br />1-27-06 <br />22.48 <br />4 -hr <br />o nt` _ <br />Failing Pere Rate <br />P-3 shallow <br />1-27-06 <br />3.0 <br />4 -hr <br />No ent <br />fling Perc Rate <br />P-3 deep <br />2-2-06 <br />24.0 <br />4 -hr <br />8.33min/in <br />ir <br />Satisfacto Perc Rate <br />*Acceptable percolation rate is less than or equal to 60 min/in during the last measurement o allow etween <br />3 and 3.5 feet. Acceptable percolation rate is less than or equal to 30 min/in during the last measurement for a deep <br />test between 3.5 and 25 feet. <br />.. The shallow percolation test on Parcel 1 and 2, and the deep percolation test on Parcel 3 achieved <br />satisfactory percolation rates and meet the requirements established by the San Joaquin County, <br />` Publi ealt} rvices, Environmental Health ' ision. <br />Y* <br />