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Project No. JB -314 24 March 2003 Page 11 We recommend reinforcing the concrete slab -on -grade floors with a minimum of either, (11 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 or centered in the slab according to the latest UBC standard. If the slab is not thick enough to maintain the 3 inch clearance, the project structural engineer should determine the acceptable concrete cover. 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. 6.5 Underground Storage Tanks Boring B-1 was drilled in the location of the proposed underground storage tanks. The soils encountered in Boring B-1 were medium stiff to very stiff silty clay and dense clayey sand to a depth of 26%: feet. Groundwater was not encountered in the borings at the time of our field exploration. The installation of these tanks should be reviewed by the manufacturer. We recommend that the excavation sideslopes be sloped no steeper than 1 %:1 (horizontal:vertical) or shored. If construction requires personnel to enter the excavation, the contractor must comply with the Occupational Health and Safety Administration regulations set forth in 29 CFR 1926, 6.6 Drainage It is important that foundation soils not be allowed to become saturated during or after construction. Furthermore, surface water must not be allowed to pond adjacent to building foundations. To preclude drainage problems, we recommend continuous roof gutter for the proposed structures. It will be necessary to direct all water collected from roof downspouts into closed conduits that lead to acceptable discharge points away from the structures. Grades should be such that drainage is away from the structures. Water and sewer utility lines should be properly installed to avoid becoming possible sources for subsurface saturation. It is important that all utility trenches be properly backfilled. If practicable, planters and/or landscaping should not be adjacent to or near the structures. If vegetation must be planted adjacent to or near kj'JKorbmacher Engineering, Inc.