SU0007284 SSNL - Laserfiche WebLink

Home Browse Search

n Soil Suitability&Nitrate Loading Study Munoz Property, Escalon, CA Page 8 Project No. 605.1 Fi June 1$, 2009 i 6.0 PERCOLATION TEST North American Technical Service (NATS) conducted a percolation test on June 5 under the supervision of the San Joaquin County Environmental Health Fj Department and using EHD percolation test as between 36 and 42guidelines. nches,while a deep ncy percolat on tesfines a t iv between 42 inches and 25 feet. In this case, a shallow test was deemed appropriate by the agency. A test percolation rate of less than 60 minutes per inch for a shallow test, or less than 30 minutes per inch for a deep test is considered a "passed" test. The test is to be made within the "footprint" of the proposed new leach field. j 6.1 Test Description On June 5, 2009 a 6-inh diameter soil boring was advanced to a depth of 40 F inches using truck-moulted drilling equipment owned and operated by NATS. An approximately 2-inch thick layer of"pea-gravel" was laced at , P the bottom of the boring, and a 2-inch diameter PVC temporary casing perforated at the bottom was place over the gravel pad. The annulus between the casing and the boring was then partially filled with pea-gravel. The PVC casing was used to measure the decreasing water level in the boring, w F I In the 24 hours prior to completing the test, the boring was pre-soaked. The packed boring was filled with water to a depth of 12 inches. The percolation test was completed in accordance with EHD requirements and under the supervision an EHD representative. The duration of the test was four hours. An electronic well sounder with an accuracy of 0.01 feet was used to monitor the fall of water during the test from a fixed point of reference. } 6.2 Test Results The percolation test yielded a percolation rat-%- o 9.26 inutes per inch, as r compared to the minimum acceptable rate of 60,m per inch. This is an 4i acceptable percolation rate. The EHD Sewage Standards should be followed to design the size of the septic system and leech field. Fit fld2937 Veneman Ave.,#B240 Geo-Phase Environmental Inc. Phone: (209)569-0293 Modesto, CA 95356 Fax: (209)569-0295