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Mr Nuel Henderson, SJCEHD April 7,2006 . Well Installation Report ARCO Facility No 5469 Stockton,California Page 3 SITE INVESTIGATION ACTIVITIES The objective of the work was to further characterize the extent of petroleum hydrocarbon impact to soil and groundwater To accomplish this objective, the following activities were implemented • Drilled and installed three (3) 4-inch diameter groundwater monitoring wells to depths ranging from approximately 52 to 53 feet bgs using hollow stem augers • Collected soil samples in 5-foot intervals during the advancement of the well borings for field screening and laboratory analyses • Developed, sampled, and surveyed the newly installed wells Prior to initiating drilling activities, a well installation permit was obtained from SJCEHD Underground Service Alert, ARCO, and SJCEHD were notified 48 hours prior to beginning work activities Standard field practices and procedures utilized by Stratus personnel during work activities are described in Appendix A All work was conducted under the direct supervision of a State of California Professional Geologist A copy of • the drilling permit is included in Appendix B FIELD ACTIVITIES Soil Borings A Stratus geologist oversaw Gregg Drilling Company of Martinez, California (C-57 #485165), complete the drilling activities between February 13 and 14, 2006 The drilling was completed using a truck mounted drilling rig equipped with 10-inch diameter hollow stem augers Each boring was converted to a groundwater monitoring well, as described below The location of each well boring is included on Figure 2 and Figure 3 The initial 5 feet of each boring were advanced with air-knife and vacuum equipment to reduce the possibility of damaging underground utilities Soil samples were collected using a California-type split-spoon sampler equipped with three precleaned brass tubes The ends of the bottom-most, intact tube from each sample interval were lined with Teflon TM sheets, capped, and sealed Each sample was labeled, placed in a resealable plastic bag, and stored to an ice-chilled cooler Strict chain-of-custody procedures were followed from the time the samples were collected until the time the samples were relinquished to the laboratory Soils were classified on-site using the Unified Soil Classification System Boring logs detailing soil stratigraphy are presented in Appendix B K\13p-Arco for URS\5469\Reports\ARC05469-wellreport2446 doc SrKArus