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• Department of Transportation specifications. In addition, the subbase gravels should meet the <br />requirements for Class II or Class III base course. <br />Drainaee: The collection and diversion of surface drainage away from the roadway area is extremely <br />important for satisfactory performance of the roadway. The design of surface drainage features should <br />be carefully considered [o remove all water Crom all roadway areas. In addition, the maintenance of all <br />drainage structures should be conducted periodically to ensure proper performance. We recommend <br />that the new gravel surface be constructed with a crown or super elevation of at least 2 percent. <br />Limitations: This report has been prepared in accordance with generally accepted soil and pavement <br />engineering practices in [his area for use by the client for design purposes. The conclusions and <br />recommendations submitted in this report are based upon the assumed traffic loadings and the data <br />obtained from the test holes advanced along the subject roadway. If during construction, soil and <br />ground water conditions appear to be different from those described herein, this office should be <br />advised at once so [ evaluation of [he recommendations may be made. We recommend [he on- <br />site observation o the s bgrade proofrolling, gravel placement and compaction by a qualified soils <br />engineer. <br />Sincerely, <br />• Brian D. Len, <br />25750 <br /> <br />-~ Raco <br />