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-roject No. JB-569 20 June 2006 Page 12 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 minimum requirement for clearance according to the latest UBC standard. 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. 6.6 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 ail 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 structures, plants that require very little moisture with drip irrigation systems should be used. Sprinkler heads should not be placed where they could saturate foundation soil. 6.7 Miscellaneous Our exploration did not reveal the presence of buried items such as leaching fields, wells, storage tanks, etc other than previously discussed. It is possible, however, that such items may be present. If such items are encountered during grading or during excavations of foundations, our firm should be notified immediately to provide recommendations for proper procedures. Also, this study did not include investigations for toxic substances or groundwater contamination of any type. If such conditions are encountered during site development, additional studies will be required. i~ Korbmacher Engineering, Inc.