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MainPlace Mall Transformation Project 12126.001 <br />4.2.8 Stormwater Management <br />Best Management Practice (BMP) of using infiltration to manage the <br />stormwater runoff is considered for the transformation future expansion. <br />Two infiltration tests were performed to evaluate the infiltration <br />characteristics of the site soils. Infiltration test results are as follows: <br />Location <br />Test Intervals (feet) Test Results (in per hour) <br />(1) Field measured test results <br />Based on our evaluation of the subsurface soil conditions of the site, a <br />Suitability Assessment Safety Factor as defined by the Orange County <br />Water Quality Management Plan of 1 may be used for the site in estimating <br />the design infiltration rate for designing the infiltration device. Review of the <br />boring logs suggested that granular soils more favorable for direct infiltration <br />were found at depth below 35 feet in LB-4 and 20 feet in LB-5, respectively. <br />Therefore, locating the infiltration devices to near these boring locations <br />may be considered. Because 1) groundwater was not encountered to a <br />depth of 50 feet during our exploration and 2) depth to groundwater exceed <br />100 feet was recorded in nearby groundwater well, the County may not <br />require maintaining a minimum 10 feet separation between of invert of the <br />infiltration device and the historic high groundwater. <br />�'♦� <br />19 / <br />Leighton <br />