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STATE OF CALIFORNIA—BUSINESS,TRANSPORTATION AND HOUSING AGENCY 1i ll PETE WILSON, Govemor DEPARTMENT OF TRANSPORTATION �a= P.O. BOX 2048(1976 E. CHARTER WAY) STOCKTON, CA 95201 TDD 209-948-7773 209-948-7906 October 9, 1996 File 10-SJ-1-5 PM 2.457 Sart Joaquin County M Application No. #QX-96-1 t Mr. Tom Gau San Joaquin County Community Development Department Development Services Department 1810 East Hazelton Avenue Stockton, CA 95205 Dear Mr. Gau: Thank you for the opportunity to review and comment on the quant' excavation application #QX-96-1 located on the west side of Koster Road, 2100 feet south of Blewett Road, southeast of Tracy. Transportation Planning has circulated this application through its normal Interdepartmental review process and we offer the following comments: Traffic impacts resulting from this and other proposed approved zdeveiopments in this area will likely be evident on SK 132 and 1-5. In order to adequately determine the impacts, a Traffic Study is needed to address capacity and safety issues at all potential access locations to the State Highway System. This study should address existing plus project and cumulative conditions. - The traffic analysis needs to show current and projected daily traffic and am and pm peak hour conditions, directional split, peak hour turning movements and impacts of large trucks on the structural and operational aspects of 1-5, 1-580 and SR 132. Again,this information is also needed for cumulative conditions. - A discussion which recommends mitigation measures for significant impacts and a reference to funding responsibility for any improvements made necessary by the project traffic and Its share of cumulative traffic improvement requirements. The mitigation's established for this project should be integrated with the mitigation and financial mechanisms established by the County of San Joaquin. 4 - Due to an earlier study for the proposed Granite quarry on Gaffery Road it was determined that the existing road and bridge system were not adequate to handle high volumes of truck traffic. The study identified a new 1-5 interchange south of Blewett with new county roads connections. From our inital review of this proposal, we believe that the moest efective mitigation for the truck traffic created by this project would be to gain highway access from this proposed new interchange. We believe that this option needs to be fully investigated as part of the planning and environmental documentation for this project, including potential shared financial responsibilities in order for the interchange to be constructed. - If access along Koster Road to SR 132 is considered we believe that a new bridge over SR 132 wip be required (consistent with the Freeway Agreement)with a right tum lane onto the frontage road, easterly to Highway 33 interchange providing freeway access. I J