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Project No. 8753009Q-A 02 • Woodward-Clyde Consultants Piezometer Installation i An array of thirty-two 1-inch (inside diameter) Schedule 80 PVC piezometers was installed along the periphery of the tank terminal area (Figure 1). A monitoring well installation permit was obtained for the array on January 20, 1987 from the SJLHD. The permit application and piezometer installation specifications are enclosed in Appendix B. A utility location map (Figure C-1, Appendix C), drawn from as-built maps provid- ed by the Port of Stockton, was used to determine if proposed piezometer locations would encounter underground obstructions. The original piezometer installation specifications stated the piezometer casings would be driven to a 10-foot depth using a fence post driver. However, due to the S presence of stiff clays and silts, the installation method was modified. i New California regulations require a licensed water well driller (C-57) to Install monitoring wells and/or piezometers. Kvilhaug Drilling of Concord, California was engaged to meet this requirement. Actual installation was accomplished by Kvilhaug Drilling personnel and Messrs. Dan Eldredge and hark Krieski of PJCC. i Ptctometer installation was performed using a combination of a push probe .nd a I-inch power auger to advance the boring to a total depth of 10 fort. The piezometers (5' slotted, 5' blank) were subsequently installed in thr open boring using a Rhino fence post driver. Locking steel esondpipes were concreted in place over the piezometers to restrict access arld rebtrict potential surface runoff into the piezometer. Approximate mps<-Saga of the piezometers are as shown below: Approximate Location Piezometers Spacing (feet) Ennt Boundary (Stork Road) Pl-P17 100 ae,.t Uoundary (Navy Drive) P18-P27 200 Mort!; Uoundary (IV. Washington St.) P28-P32 215 -5-