SU0006563 SSNL - Laserfiche WebLink

Home Browse Search

May 2, 2007 NOA Project Number: E07040B 5.4 Discussion of Soil Lithology A visual inspection of the deep soils from on-site drilling indicates limited potential for satisfactory percolation because of the fine-grained nature of the soils. However, a percolation test is the best method to determine the suitability of the soils for a septic disposal area. Please see the next section for percolation test results. Generally speaking, coarser grained soils have much greater potential for percolation than fine-grained soils. 6.0 PERCOLATION TEST INFORMATION 6.1 Percolation Test Locations '- A site map indicating the locations of the percolation test holes is included as Plate 1 of this report. 6.2 Number of Percolation Tests One shallow percolation test was conducted on the site. 6.3 Boring Preparation and Presaturation The soil borings on the site were advanced with a hand augur on March 21, 2007. A 1.5-inch diameter PVC pipe with perforations on the bottom was used to measure the drop of water in the percolation test boring. Approximately 2 inches of"pea gravel' were placed in the bottom of the open soil boring, then the PVC pipe was installed on top of the gravel. "Pea gravel' was used to backfill in the annular space. Presaturation of the percolation test hole occurred the same day of drilling. The depth of water used to pre-soak was 12 inches above the bottom of the boring. 6.4 Condition of Borings After Presaturation After the 24-hour soak period, the presaturated hole was found to be intact and dry on March 22, 2007. 6.5 Percolation Test Procedure A percolation test was conducted for the borings on March 22, 2007 in accordance with the requirements of the EHD. A percolation test with a duration of four hours was performed for the hole. The last half hour of the 4-hour percolation tests was observed by Mr. Michael Escotto, Registered Environmental Health Inspector, EHD. 6 r