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Thelma E. Hieb Revocable Trust Page 5 <br /> Our Project Number: E07202B <br /> December 20, 2007 <br /> 5.4 Discussion of Soil Lithology <br /> A visual inspection of the soils from on-site drilling indicates poor soil for adequate percolation <br /> at a depth greater than 2 feet, due to the nature of the clayey soils. A percolation test is the <br /> best method to determine the suitability of the soils for a septic disposal area. Please see the ` <br /> next section for percolation test results. Generally speaking, coarser-grained soils have much <br /> greater potential for percolation than fine-grained or cemented soils. <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 1 in the <br /> appendix of this report. <br /> a 6.2 Number of Percolation Tests <br /> A total of two (2) deep and two (2) shallow percolation tests were conducted on parcel 1 (Plate yJ <br /> _ 1). <br /> 6.3 Boring Preparation and Presaturation <br /> Two (2) shallow and two (2) deep soil borings were advanced on parcel 1 with a truck-mounted <br /> deep rock augur rig on December 13 and 18, 2007. <br /> A 1.5-inch diameter PVC pipe with perforations on the bottom was used to measure the drop of <br /> water in the percolation test boring. Approximately 2 inches of'pea gravel" were placed in the <br /> bottom of the open soil boring, then the PVC pipe was installed on top of the gravel. ' Pea <br /> gravel" was then used to backfill in the annular space. <br /> Presaturation of the percolation test holes occurred on December 13 and 18, 2007. 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 /> L After the 24-hour soak period, the presaturated holes were found to be intact on December 14 <br /> and 18, 2007. Some of the holes were found to still have water in the hole from presaturation �� <br /> on the day of testing (see attached percolation forms). <br /> 6.5 Percolation Test Procedure <br /> Percolation tests were conducted for the borings on December 14 and 19, 2007 in accordance <br /> L with the requirements of the EHD. A percolation tests with a duration of four (4) hours was <br /> performed for each hole. The last half an hour of each test was observed by Michael Escotto, <br /> i Senior Registered Environmental Health Specialist, EHD and Ted Tasiopoulos, REHS, EHD. <br /> L <br /> L <br /> 902 Industrial Way•Lodi,CA 95240•209.367.3701 •Fax 209.369.4228 ©2007 Neil O.Anderson&Associates,Inc <br />