Laserfiche WebLink
In October 2010, Don Chesney excavated a shallow soil boring on Parcel 3 of the Site <br />(then Parcel 1) for the purpose of conducting a percolation test. The exact dimensions <br />of the boring are unknown. <br />The locations of the borings are indicated on Plate 12. <br />The soil in the borings was similar to that described by the Soil Survey. On the Parcel <br />1, silt with fine sand was encountered to the full depth of the hole; partially cemented <br />conditions were encountered. On Parcel 2, silty clay with sand was encountered to the <br />full depth of the hole. The soil logs are presented on Plates 13 and 14. <br />Discussion of Soil Lithology <br />Based on the soil observed in the borings, there appears to be moderate potential for <br />percolation in the shallow soil zones at the test locations. Sandy soils generally have a <br />much greater potential for percolation than fine-grained or cemented soils. However, a <br />percolation test is the only accepted method for determining the suitability of the soils <br />for a septic disposal area. Percolation test results are discussed in the following <br />section. <br />Percolation Test <br />Shallow percolation tests were conducted at all three locations on the Site. The soil <br />borings discussed above were used for the percolation test holes. Percolation test <br />procedures conformed to San Joaquin County Environmental Health Department policy. <br />Preparation and Presaturation of Percolation Test Holes <br />For the tests performed by Live Oak, after the borings were advanced by hand auger <br />and the soil logged, the test holes were completed for the percolation testing. <br />Approximately two inches of pea gravel were placed in the bottom of each open soil <br />boring, followed by a 2.0 -inch diameter PVC pipe with perforations on the bottom. Pea <br />gravel was then used to backfill a few inches of the annular space. <br />Live Oak presaturated the percolation test holes approximately 24 hours prior to the <br />percolation testing. Each hole was filled with water to a height of 12 inches above the <br />bottom of the boring for the presaturation. On the day of testing, the holes were found <br />to be intact and dry. <br />It is presumed that Mr. Chesney followed a similar procedure to complete and <br />presaturate the test hole on Parcel 3. <br />LOGE 2141 Page 6 <br />