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I I I I I I I I I I I I I I I I I I I December 22, 1995, the contractor's pile driving subcontractor (T.L. Lafferty Welding) was onsite setting up equipment in the vicinity of the entrance structure. About 3:00 p.m. the subcontractor begins to drive piling using a FMC 82 ton crane for pile driving and a 27 lf2 ton Lorain crane to position and thread piling, after about lf2 hour it is was determined there may be additional buried concrete. Additional pieces of concrete were discovered and removed from the area. Reference Photo Nos. CN-1745-417-31NA and CN-1745-417-32NA December 23, 1995, the piling subcontractor continued driving piling. Sixteen pieces of piling were driven to a depth of ten feet. Reference Photo No. CN-1745-417-33NA December 27, 1995, the piling subcontractor completed driving piling for the protection of the Redlands existing apron and abutment at the entrance structure. A total of 30 pieces of piling were driven to an average depth of twenty two feet. Reference Photo Nos. CN-1745-417-86NA and CN-1745-417-87NA January 5, 1996, the contractor using a Drott 40 trackhoe began excavation at the entrance structure. Reference Photo No. CN-1745-417-43NA January 12, 1996, a leak develops under existing concrete apron while contractor is excavating near piling close to rivers edge. The leak was caused by voids under the adjacent concrete apron. Three pumps are set but cannot keep up with water. Water fills excavation to the same elevation of river before flow into excavation stops. January 15, 1996, contractor's grout subcontractor drills 2-inch diameter holes in concrete apron near abutment and pumps grout into holes (seven cubic yards of grout into two holes) to stop leak. Modification No. 004 ($13,461.16) was used to compensate the contractor for the flooding of the entrance structure. January 16, 1996, the contractor resumes excavation at the entrance structure. January 20, 1996, excavation for entrance structure is complete. Const-3