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------ CONSTRUCTION <br /> INSPECTION&MATERIALS <br /> TESTING LABORATORY <br /> North American Technical Services <br /> October 3,2016 <br /> Morrill Industries,Inc. <br /> 24754 East River Road <br /> Escalon CA 95320 <br /> Subject: Percolation Testing—Storm Drain and Septic Systems <br /> On 9/29/2016,Justin Hasley of North American Technical Services conducted 2 percolation tests <br /> in auger borings at various depths (see percolation test reports and test map for locations). The tests were <br /> performed in accordance with San Joaquin County requirements for preparing and presaturating the soil in <br /> the test hole. After presaturation, we detennined the stabilized percolation rate. The tests for the septic <br /> system leach fields were observed by the San Joaquin County Enviromnental Health Department as <br /> required. <br /> As part of the associated soils report (#467-1), exploratory borings were made to a depth of 16.5 <br /> feet below the existing grade. Please see the boring logs attached for materials encountered. Groundwater <br /> was not encountered. Storm drain percolation test results are as follows: <br /> Test De th Percolation Rate Observed Absorption Rate <br /> A 7.5 ft 1.81 min/inch 71.1 gal/fe/day <br /> B 6.0 ft 1.74 rnin/inch 74.0 gaFfelday <br /> The Observed Absorption Rate is the measured rate and does not include any reduction factor. <br /> The material encountered at the tested depths was a light brown sand. <br /> Storm Drain Location Storm Drain Design Depth Desi an Absorption Rate <br /> A-Intermediate Pond 7.5-10 below (E)natural grade 35.6 gal/f /day <br /> B -Existing Basin (E) to 31 below(E)grade of basin 37.0 gaUft�/day <br /> Design Absorption Rates include a reduction factor of 2. <br /> Percolation rates for septic system design are given below, Systems should be designed in accordance <br /> with San Joaquin County Environmental Health Department requirements. <br /> Septic System Location Test Depth Percolation Rate <br /> Test#1 —East Location 42" below a/inch <br /> Test#2—West Location 42" below E ade 1.70 min/inch <br /> Respectfully Submitted, <br /> 1,:'"QROFCSSlONq� <br /> S <br /> Abel R. Scares,RCE# 18260 No. 18260 <br /> rc <br /> . .; ' <br /> '7 <br /> North American Technical Services Exp-p.,14� 1 '- <br /> 4713 ENTERPRISE WAY•SUITE RNIA •95356.209-545-1108 <br />