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Santa Fe Pacific Pipeline Partners, L.P. J-6075.03 <br /> Lr January 6, 1994 STOCKTON WORK PLAN Page 4 <br /> Three soil samples will be obtained from each boring from 3, 6 and 10 feet <br /> BGS. The obtained samples will be submitted for analysis of TPH as diesel <br /> by modified EPA method 8015/3550, for TPH as gasoline by EPA method <br /> 8015/5030, for aromatic volatile organics benzene, toluene, ethyl benzene, <br /> and xylenes (BTEX) by EPA Method 8015/8020. These analyses will be <br /> performed by a California State Certified Analytical Lab under subcontract <br /> to Hart Crowser. <br /> The samples will be screened in the field for organic vapors using an HNu <br /> photo-ionization detector (PID). The soil borings will be backfilled with <br /> cement grout. All soil cuttings from the borings will be placed in DOT- <br /> approved storage drums or a roll-off storage bin and left onsite. <br /> Task 2 -B-Zone Groundwater Monitoring Well Installation <br /> Hart Crowser will retain a licensed drilling company to drill and install a <br /> B-zone monitoring well (M-8) to assess the vertical groundwater gradient <br /> and determine the quality of groundwater. Monitoring well (M-8) will be <br /> installed upgradient of the manifold/prover loop area in close proximity <br /> to the existing monitoring well M-5. The M-5/M-8 monitoring well cluster <br /> can be utilized for the vertical gradient evaluation (Site Plan, Figure 2). <br /> Prior to drilling, the location of the monitoring well will be potholed to <br /> approximately 4 feet BGS for utility clearance under supervision of a SFPP <br /> inspector. The specifications of the monitoring well are based on <br /> subsurface information obtained during the previous investigations at the <br /> site. <br /> A pilot soil boring will be drilled into the A/B interface zone <br /> (approximately 25 feet BGS) and soil will be continuously sampled using a <br /> 2 - foot, two inch diameter California-type soil sampler fitted with stainless <br /> steel sample liners. Each two foot soil core will be screened for the <br /> presence of volatile organic compounds using a PID. Soil samples <br /> intended for chemical analysis will be sealed with Teflon tape, fitted with <br /> endcaps, and placed in refrigerated storage. <br /> The pilot boring will then be reamed out using a 16 - inch solid auger to 25 <br /> feet BGS and a 12- inch steel casing will be installed. Cement grout will be <br /> placed between the boring and the steel casing and will be allowed to set <br /> overnight. After the grout has sufficiently set, all water and mud will be <br />