Premier Field Development, Inc. 5/9/2016

-14- Cut and Fill Slopes Permanent cut and fill slopes that are not subjected to seepage forces should be no steeper than 2H:1V (horizontal to vertical) for stability considerations. Flatter slopes may be desirable to facilitate mowing. Temporary cuts in dense unweathered till will most likely be stable at slopes as steep as 0.5H: 1V. Temporary cuts in other materials should be planned no steeper than 2H:1V. Based on our limited explorations, it is our opinion that seepage en- countered in the test pits was due to perched water pockets, and not a static groundwater level . Therefore, if seepage is encountered, we t expect that it will eventually dissipate. If, during construction, a continuous source of water is found in cut slopes, permanent slopes and drainage provisions will need to be addressed. Protection of Compacted Fill and Subgrades Even if soils are dried and properly compacted, they will be subject to disturbance in the presence of water, especially if subjected to traf- fic. Disturbance can be limited by grading surfaces to drain, sealing surfaces to limit penetration of water, and preventing traffic on wet surfaces. Grading should not be performed in wet weather. Slopes should be seeded to provide erosion protection. Structure Support Hall Park Restroom: Based on the conditions observed in TP-112 and TP-114, it appears that fill extends down to about Elevation 610. At this level , a 1-foot-thick layer of branches and roots was encountered in TP-112. If Hall Park is graded to the assumed Elevation 612 to 613, and footings have a typical embedment of 18 inches, footings would bear directly above the organic layer. We recommend that existing fill and organic layers be removed to expose native soil , which is expected to consist of alluvium or weathered till . Native soil should be removed to a depth of at least 2 feet below the planned bottom of footing elevation