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Work Plan for Subsurface Investigation for the Stockton Viaduct Bridge (Br. No. 29-0176R/L) Retrofit <br /> We plan to drill four(4) borings to a depth of 250 feet below mud line from the drill ship RV Quin Delta <br /> for subsurface investigation. The borings will be drilled using a mud rotary system and sampled using <br /> punch core,Shelby tube samples, SPT and California Modified. Water for drilling will be taken from the <br /> river. Water is between 20 and 40 feet deep in the drilling locations. Soil cuttings and drilling fluid will <br /> be drummed and transported to the nearest Caltrans yard and disposed of by a subcontractor once it <br /> has been characterized. Once boreholes have been drilled to the total depth of 250 feet,they will be <br /> backfilled with bentonite chips in accordance to the agreement between Caltrans, San Joaquin County, <br /> and the US Fish and Wildlife Service. <br /> I <br /> 2 fi � <br />