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ri <br /> S E C O R <br /> 76(Former BP)Service Station No.11193 <br /> SJCEHD <br /> August 30,2007 <br /> Page 2 <br /> Permitting. Permits for the installation of the groundwater monitoring wells will <br /> be obtained from SJCEHD prior to beginning work. Atlantic Richfield Company(a . <br /> BP affiliated company) will obtain access agreements with the owners of the <br /> for the installation of wells MW-14 and MW-15. <br /> nearby properties <br /> Borehole Clearance Activities. Prior to initiating field activities, SECOR will Gr`t�7 <br /> mark the boring locations, contact Underground Service Alert (USA) at least 48 <br /> hours prior to the initiation of field work, and will contract a private utility locator to <br /> determine whether the proposed boring locations are clear of potential subsurface I <br /> obstructions. After clearance is verified by USA and the utility locator,the borings <br /> will be air-knifed to a depth of approximately five feet bgs to further minimize the <br /> risk of encountering subsurface structures that are not anticipated at the �k <br /> locations. I <br /> l <br /> Soil Sampling and Analysis. Soil borings for wells MW-14 and MW-15 ill b �i <br /> • - we r <br /> advanced at the locations shown on Figure 1 using hollow stem auger drilling <br /> equipment. During drilling activities, soil samples will be collected at five-foot <br /> intervals using a California-modified Split Spoon sampler for the purpose of <br /> logging stratigraphy, moisture content, odor, and other physical characteristics. <br /> The extracted soil samples for stratigraphic interpretation will be analyzed in the <br /> i <br /> field for the presence of volatile organic compounds (VOCs) with a photo- } <br /> ionization detector(PID). <br /> The soil boring for well MW-13 will be advanced on-site at the location illustrated <br /> on Figure 1, using hollow stem auger drilling equipment to the depth of the <br /> previously identified sand/silt layer in boring CPT-2(approximately 96 feet to 108 X60 �0� r lfi <br /> feet bgs). The stratigraphy will not be logged from the surface to 100 feet bgs; <br /> however,the soil samples extracted by a California-modified Split Spoon sampler <br /> will be continuously logged from approximately 100 feet bgs to the total depth <br /> explored. The stratigraphy, moisture content, odor, other physical characteristics, <br /> and PED readings will be recorded on the boring log. The total depth explored will <br /> be contingent upon the depth of the next water-bearing zone consisting of coarse- <br /> grained soil encountered within the boring. SECOR anticipates that the total depth <br /> of the boring will be between approximately 100 feet and 110 feet bgs. t <br /> f <br /> • Groundwater Monitoring Well Installation. The off-site boreholes will be <br /> completed as groundwater monitoring wells at an approximate depth of 30 feet <br /> bgs, depending on the depth to groundwater and the stratigraphy encountered at <br /> each location. A two-inch diameter well will be installed within each borehole,and <br /> will be constructed with Schedule 40 polyvinyl chloride(PVC)casing with 20 feet <br /> of 0.010-inch slotted screen extending from approximately 10 feet to 30 feet bgs. -� <br /> E <br /> I:1BP-ARC0105 BP-COP Sites1111931Work Plans111193 Vertical Delineation WP.doc <br />