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August 18,2014 <br /> Gibson Bluff <br /> L&A Job No. 14-056 <br /> Page 19 <br /> a gradient of 3 percent minimum for a distance of at least 10 feet away from the buildings, <br /> except in the areas to be paved. <br /> Cleanouts <br /> Sufficient number of cleanouts at strategic locations should be provided for the <br /> underground drain line systems. The underground drain line systems should be <br /> maintained periodically to prevent clogging. • <br /> ONSITE STORMWATER DISPOSAL <br /> General <br /> All three test borings encountered clean sandy soil of Esperance sand deposits at depths <br /> of about 3.5 to 8.0 feet below existing ground surface. Soil samples taken from the <br /> targeted Esperance sand deposits' were obtained for soil particle distribution test in the ' <br /> laboratory to determine their infiltration rates.-- Feasibility of onsite stormwater disposal <br /> was evaluated based on the test results. . The analysis of test results presented below <br /> indicates the Esperance sand deposits underlying the project site will be able to support <br /> onsite stormwater disposal by infiltration. <br /> Particle Size Distribution Tests and Estimated Infiltration Rates <br /> Three soil samples, one from each of the three test pits, were obtained from the Esperance <br /> sand deposits and taken to HWA laboratory for Soil Particle Size Distribution test. These <br /> soil samples are listed in the table below and their test reports are presented on Plates A-1. <br /> • and A-2 in the attached appendix. • <br /> LIU & ASSOCIATES, INC. <br />