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Mr.Nuel Henderson,Jr. • October 15,2002 <br /> ARCO Station 6100 Project No.U 6100 <br /> Work Plan Page 5 <br /> The existence or usage of the downgradient artesian well has not been verified. This will be <br /> done as part of the field activities. <br /> The proposed scope of work has been subdivided into tasks 1 through 5. All geologic work will <br /> be conducted under the direct supervision of a State of California Registered Geologist, and will <br /> be conducted in accordance with standards established by the Tri-Regional Board Guidelines for <br /> Hydrocarbon Site Assessment and Remediation (CRWQCB, 1991) and SJC/EHD. A well <br /> driller, holding a current C-57 license from the State of California, will perform all drilling and <br /> well installation activities. Information regarding field practices and procedures is presented in <br /> Appendix A. <br /> Task 1. PRE-FIELD ACTIVITIES <br /> Following approval of this work plan by SJC/EHD, Stratus will submit applications for four soil <br /> borings and four groundwater monitoring wells to SJC/EHD. Permission to install two <br /> additional borings/groundwater monitoring wells on the parcel south of the site will be solicited <br /> from the property owner. An encroachment permit will be secured from San Joaquin County, <br /> Department of Transportation (SJC/DOT) to install two additional borings/groundwater <br /> monitoring wells in the county right-of-way. Stratus will secure well construction and well <br /> destruction permits from SJC/EHD. Proposed drilling locations (shown on Figure 2) will be <br /> marked in white paint as required by law, then Stratus will notify Underground Service Alert, <br /> SJC/EHD, SJC/DOT, and the property owner of the work schedule. <br /> Task 2: FIELD ACTIVITIES <br /> Proposed field activities have been subdivided into two parts. Task 2a addresses activities <br /> associated with advancing the proposed soil borings and installing the proposed groundwater <br /> monitoring wells. Task 2b addresses the activities associated with the destruction of well <br /> VW-15. Stratus will also attempt to verify the existence, location, and usage of the artesian well. <br /> Task 2a: Soil Borings and Well Installation <br /> The following section details those activities associated with 1) drilling the four soil borings <br /> using mud rotary drilling methods, 2) collection of soil samples, 3) drilling adjacent borings and <br /> installing monitoring wells using hollow-stem drilling methods, and 4) developing, sampling, <br /> and surveying the newly installed monitoring wells. The proposed locations of the soil borings <br /> and wells are shown on Figure 2. <br /> Soil Borings and Sample Collection <br /> The initial five feet of each boring will be advanced with a hand auger and/or posthole digger to <br /> reduce the possibility of damaging underground utilities. A mud-rotary drilling rig will be used <br /> to advance four exploratory soil borings (13-38 through B-42) to a depth of approximately 150 <br /> feet bgs. Non-petroleum based drilling mud will be used during drilling. The drilling mud will <br /> have a density greater than the density of water to prevent water from flowing into the borehole <br /> P:\Bp-Arco for URS\6100\Work Plans\6100 workplan-l.doc <br />