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Environmental Investigation Workplan <br /> Banner Island, Stockton, California <br /> In an effort to evaluate the presence of lead and petroleum hydrocarbons in soil and ground water <br /> at Banner Island, Stockton, California, Harza will drill ten exploratory borings and collect soil and <br /> ground water samples. The site location is shown on Figure 1, and the site plan is shown on <br /> Figure 2. <br /> 1.0 SCOPE OF WORK <br /> Our scope of work will consist of the following tasks: <br /> 1.1 Task 1 - Prefield Activities <br /> Prior to drilling the wells,Harza will notify Underground Service Alert(USA)to clear the proposed <br /> drilling locations, and obtain drilling permits from the San Joaquin County Department of <br /> Environmental Services. <br /> 1.2 Task 2 - Soil Borings <br /> Drilling and sampling procedures are attached. Ten holes (HB 1 - HB l 0) will be drilled at the <br /> approximate locations shown on Figure 2. Soil samples will be collected to evaluate the presence <br /> of petroleum hydrocarbons in shallow soil in the west and east sides of the property, and to <br /> characterize the vertical and areal extent of metals in the vicinity of former boring B 1, MW-6, and <br /> MW-7, and of metals and petroleum hydrocarbons near former boring 134. <br /> The west and east portions of the property will be evaluated by collecting soil samples from depths <br /> of 1.5 and 3 feet at five locations(HB 1 -HB5)as shown on Figure 2. The 1.5-foot samples will be <br /> analyzed for total petroleum hydrocarbons (TPH) as diesel, kerosene, hydraulic oil, and motor oil <br /> (total extractable petroleum hydrocarbons, or TEPH), and TPH as gasoline (TPHg) and benzene, <br /> toluene, ethylbenzene,and xylenes(BTEX). The 3-foot samples will be held pending the results of <br /> the initial analyses. <br /> Soil samples will be collected from two locations (HB6 and HB7) between boring B 1 and wells <br /> MW-6 and MW-7 as shown on Figure 2. Samples will be collected at depths of 1.5, 5, and 10 feet. <br /> All soil samples will be analyzed for lead. <br /> Soil samples will be collected from three locations (H138 - HB 10) in the vicinity of boring 134 on <br /> 25-foot centers. Samples will be collected at depths of 1.5, 5, and 10 feet. Boring HB8 will be <br /> advanced to approximately 2 feet below the water table,and a ground water sample will be collected. <br /> L067-H environ\ban_wp.sjc <br /> 9-14-95 1 <br /> i i n p ,a, <br />