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Santa Fe Pacific Pipeline Partners, L.P. J-6075.03 Lr January 6, 1994 STOCKTON WORK PLAN Page 4 Three soil samples will be obtained from each boring from 3, 6 and 10 feet BGS. The obtained samples will be submitted for analysis of 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 8015/8020. These analyses will be performed by a California State Certified Analytical Lab under subcontract to Hart Crowser. The samples will be screened in the field for organic vapors using an HNu photo-ionization detector (PID). The soil borings will be backfilled with cement grout. All soil cuttings from the borings will be placed in DOT- approved storage drums or a roll-off storage bin and left onsite. Task 2 -B-Zone Groundwater Monitoring Well Installation Hart Crowser will retain a licensed drilling company to drill and install a B-zone monitoring well (M-8) to assess the vertical groundwater gradient and determine the quality of groundwater. Monitoring well (M-8) will be installed upgradient of the manifold/prover loop area in close proximity to the existing monitoring well M-5. The M-5/M-8 monitoring well cluster can be utilized for the vertical gradient evaluation (Site Plan, Figure 2). Prior to drilling, the location of the monitoring well will be potholed to approximately 4 feet BGS for utility clearance under supervision of a SFPP inspector. The specifications of the monitoring well are based on subsurface information obtained during the previous investigations at the site. A pilot soil boring will be drilled into the A/B interface zone (approximately 25 feet BGS) and soil will be continuously sampled using a 2 - foot, two inch diameter California-type soil sampler fitted with stainless steel sample liners. Each two foot soil core will be screened for the presence of volatile organic compounds using a PID. Soil samples intended for chemical analysis will be sealed with Teflon tape, fitted with endcaps, and placed in refrigerated storage. The pilot boring will then be reamed out using a 16 - inch solid auger to 25 feet BGS and a 12- inch steel casing will be installed. Cement grout will be placed between the boring and the steel casing and will be allowed to set overnight. After the grout has sufficiently set, all water and mud will be