Premier Field Development, Inc. 5/9/2016

-11- only means of avoiding this settlement would be to remove the fill con- taining organics. Considering that the fill was observed to extend to as deep as 9 feet at our explorations, we anticipate that removal and replacement would involve large quantities of material . Therefore, it is our opinion that it may be more cost effective to leave the existing fill in place, and expect that some future maintenance will be required. If this is not acceptable, the fill should be removed and replaced with new inorganic compacted fill . At the south end of Kasch Park (proposed softball fields) most of our explorations did not encounter fill . However, at TP-202 there was loose organic compressible topsoil fill to a depth of 5 feet in an area where about 4 feet of new fill is planned. We estimate that long term settle- ment due to loading by the new fill could be on the order of 6 inches. In addition, settlement due to decomposition of organic matter is ex- pected. We therefore recommend that the topsoil fill observed at the vicinity of TP-202 be excavated to expose inorganic native weathered till , and that the excavation be refilled with new compacted fill . The source and lateral extent of the existing fill isnotknown. Thus, it is recommended that excavation begin in the area of TP-202, and that the topsoil fill be "chased" to determine where it underlies proposed new fill for the softball fields. Elsewhere in the south end of Kasch Park, new fill is expected to cause minor settlement due to compression of underlying native soil . However, the silty sand till is expected to compress relatively rapidly, and the majority of settlement is expected to occur during construction. At the north end of Kasch Park, fill was noted in the explorations to depths as great as 8 feet (TP-209) . Although man-made fill can be ex- pected to be variable in quality, thickness, and lateral extent, we recommend the following treatments, based on the available information: