Laserfiche WebLink
_ November 23, 2004 <br /> NOA Project Number: E04140A <br /> 5.4 Discussion of Soil Lithology <br /> The soil is a typical Lodi type silty sand. These soils were deposited by meandering of the nearby <br /> Mokelumne River. <br /> 6.0 PERCOLATION TEST INFORMATION <br /> 6.1 Percolation Test Locations <br /> A site map indicating the locations of the percolation test holes is included as Plate 3 in the appendix <br /> of this report. <br /> 6.2 Number of Percolation Tests <br /> One shallow 3-foot deep percolation test was conducted at the Site. <br /> 6.3 Boring Preparation and Presaturation <br /> A hand-auger was used to bore a 3.0-foot hole on August 1, 2002. A 1.5-inch diameter PVC pipe <br /> with perforations on the bottom was used to measure the drop of water in the percolation test <br /> boring. Approximately 2 inches of"pea gravel' were placed in the bottom of the open soil boring, <br /> then the PVC pipe was installed on top of the gravel. A few inches of"pea gravel' were backfilled in <br /> the annular space. Presaturation of the percolation test hole occurred on August 1, 2002. The depth <br /> of water used to pre-soak was 12 inches above the bottom of the boring. <br /> 6.4 Condition of Borings After Presaturation <br /> After the 24-hour soak period, the presaturated hole was found to be intact and dry on August 2, <br /> 2002. <br /> 6.5 Percolation Test Procedure <br /> A percolation test was conducted for the boring on August 2, 2002 in accordance with the <br /> requirements of the EHD. A percolation test with a duration of one hour was performed for the <br /> hole. The percolation test was observed by Johnny Yoakum, Registered Environmental Health <br /> Inspector, EHD. <br /> 8 <br />