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<br />Hana Japan Steak House 5150.100.001 <br />11991 Dublin Canyon Road November 11, 2024 <br />RESPONSE TO COMMENTS Page 8 <br /> <br />ENGEO Response to Comment 25 <br />We opine that Caltrans is not clear as to the minimum depth of R-Value in their design guidance, and <br />since this private drive and parking lot are not a part of the Caltrans highway system, we will leave <br />this portion of the report as is. <br /> <br />Comment 26 Geotechnical Report, Section 10.2 (Rigid Pavements): <br />Only 4 inches of aggregate base is recommended below the Portland Cement Concrete (PCC) <br />pavement section. A minimum of 6 inches of aggregate base is typically recommended below PCC <br />pavements. Therefore, consideration should be given to increasing the recommended aggregate <br />base layer thickness. <br /> <br />ENGEO Response to Comment 26 <br />Following the PCA design guidelines “Thickness Design for Concrete Highway and Street <br />Pavements,” PCC pavements can be designed without aggregate base. We do not concur that <br />6 inches of aggregate base is a minimum requirement for non-highway applications of PCC <br />pavements. As such, we will leave this portion of the report as is. <br /> <br />Comment 27 Geotechnical Report, Section 10.4 (Cut-Off Curbs): <br />The cut-off curbs recommended in this section of the Geotechnical report should not be optional. In <br />particular because the surrounding areas are sloped to drain towards this Site. Prolonged exposure <br />of pavement subgrade to excessive moisture can reduce the pavement life by 50 percent or more. <br /> <br />ENGEO Response to Comment 27 <br />To our knowledge, the use of cut-off curbs is not a City of Pleasanton standard for city improvements. <br />As such, we opine that the implementation of this recommendation on private improvements should <br />be the owner’s option. As such, we will leave this portion of the report as is. <br /> <br />Comment 28 Geotechnical Report, Section 12 (Limitations): <br />Reference should be changed to Section 3 for the project description. <br /> <br />ENGEO Response to Comment 28 <br />We will address this in the Reference 2 update. <br /> <br />If you have any questions or comments regarding this letter, please contact us and we will be <br />glad to discuss them with you. <br /> <br />Sincerely, <br /> <br />ENGEO Incorporated <br /> <br /> <br /> <br /> <br />Jeff Fippin, GE Brooks Ramsdell, CEG <br /> <br />jaf/jbr/dsh/cb <br /> <br />Attachment: Selected References