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Attachment C Recommendations for Smith Canal Test Pile Work Plan Date: Friday, August 30, 2019 Project: Smith Canal Floodwall, Stockton, California To: Dave C. Carr— KSN Inc. From: Garrett Harris, P.E., G.E. In an effort to support construction estimations and development of approach, HDR has been asked to provide input for a work plan for a field test program specific to the installation of sheet piles. The goal of the test program is to determine the drivability of the proposed project sheet pile sections. HDR recommends that the test program should include explorations to verify the subsurface and drivability conditions within the project foundation boundaries at a test location and for subsequent correlations along the project alignment. Explorations The use of a Cone Penetration Tests (CPTs) rig should be used to obtain soil behavior characteristics at sheet pile test locations along the floodwall alignment. More specifically, HDR recommends between five and seven CPTs total be spread relatively evenly along the floodwall alignment and within the gate structure foot print. This includes a couple of CPT locations and sheet pile test locations of at least one CPT being performed with 5 -feet of a sheet pile test location. CPTs should be advanced to at least an elevation of - 80 feet or to refusal, whichever occurs first. CPTs should be performed in accordance with ASTM D 5778-12 using a 15cm cone probe. It is HDRs understanding that the test program will be confined to the water area of the project, therefore, CPTs will likely be performed from a barge. Figure 1 illustrates proposed CPT locations with associated test sheet pile locations. Sheet Pile installation HDR recommends that the contractor use AS 500 12.7 sheet piles or a sheet pile with equivalent structural properties for a test program. Furthermore, the contractor should be prepared to advance sheet piles to design tip elevation of - 70 feet or refusal, whichever occurs first. It is our understanding that the sheet piles will be advanced with a vibratory hammer. Refusal criteria for advancement as stated in the current version of the project specifications is 12 -inches per minute using a vibratory hammer. Should the contractor determine that the vibratory hammer is inadequate, it is recommended that a diesel hammer be considered for advancing the three test sheet piles. The size of the hammers to be used during the test program should be as close as possible to the hammer that is anticipated to be used during production.