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Santa Fe Pacific Pipeline Partners, L.P. J-6075.03 L/ January 6, 1994 STOCKTON WORK PLAN Page 5 removed from the hole prior to drilling the remaining footage. A 10-inch auger will be used to advance the boring into the B-zone approximately 15 feet to the underlying aquitard. The monitoring well will then be set at approximately 45 feet BGS. All soil cuttings collected during the well drilling process will be placed in DOT - 17, 55-gallon storage drums or a roll-off storage bin and left onsite in a client specified location. The monitoring well will be constructed of 4-inch, schedule 40 PVC casing and screen with 0.020 - inch slots. The monitoring well screen will be installed from the bottom of the boring to the top of the B-zone (10 to 15 feet in length) and the casing will be installed from the top of the screen to approximately 2 feet above ground surface. A filter pack consisting of #2/12 silica sand will be placed from the bottom of the screen to approximately one foot above the screened interval. A one-foot thick bentonite seal will be placed above the filter pack, hydrated with distilled water and allowed to set. Cement grout will then be placed from the top of the bentonite seal to the ground surface. An expandable locking cap will be used to seal the well and a three foot metal well box will be installed as well protection. A total of four soil samples will be submitted for chemical analysis. The soil samples will be obtained from the vadose zone, at first encountered groundwater, within the A/B interface zone and from within the B-zone. These samples will be analyzed for total petroleum hydrocarbons (TPH) as diesel by modified EPA method 8015/3550, for TPH as gasoline by EPA method 8015/5030, for aromatic volatile organics benzene, toluene, ethyl benzene, and xylenes (BTEX) by EPA Method 8020. These analyses will be performed by a California State Certified Analytical Lab under subcontract to Hart Crowser. Monitoring Well Surveying, Development and Sampling The newly installed monitoring well will be developed by manual surging and over-pumping with an appropriate submersible pump. The well will be developed until reasonably free of sediment. Hart Crowser will subcontract a licensed well drilling company to develop the monitoring well.