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Granite Construction Company Rose Excavation—Off-Site Drainage Study Page 2 The following table summarizes the results of this study. Hydrological Results Sub-Basin ID Area(acres) Peak Flow cfs) Sub 1A 184.2 31 Sub 1B 253.1 43 TOTAL 74 The results contained herein are for permitting purposes for the Tracy Expansion ---Rose Excavation in San Joaquin County, California. This study and its results are invalid if: i. The design assumptions change. 2. The delineation, topography, and/or land use of the sub-basins depicted on Figure 1 change from those assumed in this study. 3. The recovery of more data, data from a closer location, and/or the collection or generation of new data changes the assumed conditions of the sub--basins,the site, and/or the surrounding region. 4. The report is used for an adjacent or other property. 5. Any other change is implemented which materially alters the project from that proposed. This study was prepared in accordance with generally accepted standards of civil engineering practice which exist in San Joaquin County at the time the letter was prepared. No other warranty, expressed or implied, is made. It is the responsibility of the Granite Construction Company to see that all relevant parties to the project are made aware of this study in its entirety. We hope this information meets with your expectations, and we look forward to providing continued services to Granite Construction Company. Ij Sincerely, CONDOR EARTH TECHNOLOGIES,INC. oorGio Del Papa, P.E. J e , P. - Associate Engineer nginee ng Services Manager Enclosures Figure 1 --Off-site Drainage Patterns Tracy Expansion—Rose Excavation Table 1 --CN Weighting Table 2—Time of Concentration PAOI04L Granite Tracy SW Excavation ExpansionlCorrespondence\Deb Keeland_09-19-02_Letter.doc 4F* i