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Project No. JB-20100 4 December 2000 Page 11 We recommend concrete slab-on-grade floors and exterior flatwork be a minimum thickness of 4 inches and the trash enclosure area slab be a minimum thickness of 6 inches. The actual slab thickness must be determined by the project structural engineer. The trash enclosure area pavement section should be a minimum of 6 inches of concrete over 6 inches of aggregate base and designed according to the recommendations presented in Section 5.7 Pavements. We recommend reinforcing the concrete slab-on-grade floors with a minimum of either, (1) No. 3 reinforcing bars spaced at 24 inches on center, or (2) with an alternate steel reinforcement as required by the project structural engineer. In general, the steel reinforcement should be supported by concrete dobies to maintain the 3-inch minimum requirement for clearance between earth and reinforcing steel for the slabs according to the latest UBC standard. Crack control joints should be located as directed by the project structural engineer. Recommendations presented in the American Concrete Institute manual should be complied with for all concrete placement and curing operations. Improper curing techniques and/or excessive slump (water-cement ratio) could cause excessive shrinkage, cracking or curling. Concrete slabs should be allowed to cure adequately before placing vinyl or other moisture sensitive floor coverings. e 5.5 Underground Storage Tanks Groundwater was not encountered in the boring at the time of our field _ exploration. We expect water levels to fluctuate due to variations in rainfall, groundwater recharge, and site conditions. The installation of these tanks should be reviewed by the manufacturer. According to tank excavation details observed on past projects, the anticipated depth of excavation for installation of the fuel storage tanks will be about 15 feet below existing grade. Due to the loose silty soils at the site, interlocking shoring may be required for the tank excavation. ' 5.6 Drainage ] It is important that foundation soils not be allowed to become saturated during or after construction. Furthermore, surface water must not be allowed 1 to pond adjacent to building foundations. To preclude drainage problems, ' we recommend continuous roof gutter for the proposed structures. It will MKorbmachcr Enginccring, Inc.