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'i Monitoring W01 Insta]latcon Report - Chevron Service Station 119-3232 November 20, 1998 In December 1993, dispensers and product lines were removed The dispensers weie replaced and the product lines were upgraded fiom single-walled fiberglass to double-walled fiberglass The three 10,000-gallon single-walled fiberglass USTs were not removed or upgi aded Touchstone Developments witnessed the removal of the subsurface facilities Soil samples were collected from beneath the product lines and the waste oil UST remote fill pipe Total Petioleum Hydrocarbons as gasoline (TPI-1g) were detected in one soil sample from beneath the product lines at a concentration of 7 patts pei million (ppm) Benzene was detected in one sample at a concentiatton of 0 81 ppm Lead was detected in thrce of the five soil samples at concentrations of 5 and 6 ppm The soil sample collected beneath the used oil UST remote fill pipe contained TPHg (3 ppm) Total Petroleum ITydrocarbons as diesel (TPHd) were detected in this sample at a concentration of 350 ppm, and Total Oil and Gicase (TOG) were detected at a concentration of 1,700 ppm Trichloioethcne (TCE) was also detected in this sample at a concentration of 0 037 Ppm FIELD ACTIVITIES Field work for well installation was pet formed in accordance with the GR Site Safety Plan • #346463 01, dated Octobei 8, 1998 GR Field Methods and Proceduies arc included in Appendix A Underground Service Alert (USA) was notified 48 hours pi for to scheduled work, and a private line locator was sub-contracted to identify on-site subsurface utilities Drilling and well installation activities were perfoi med by Bay Area Exploration (C57#522125)under S.ICPIS permit No 017173 A copy of the well installation permit is included in Appendix B Three on-site soil boi Ings were drilled October 29 and 30, 1998 and were completed as groundwater monitoting wells MW-1 through MW-3 The wells were installed to total depths between 50 and 55 feet below ground surface (bgs) The boi ings weie drilled using truck mounted drill rig equipped with 8-inch diameter hollow-stem augers A GR geologist was on-site to observe the diillmg and well installation activities, collect soil samples for possible chemical analyses, desci ibe the encountered soil, and prepare a log of each boring Logs of Borings are included in Appendix B Locations of the newly installed wells are shown in Figure 2 Soil cuttings gcnei aced dui ing di illing were placed on and covered with plastic sheeting and stored at the site pending disposal Approximately 2 5 cubic yards of drill cuttings wet geneiated One composite Soil sample (SSI- A and B) was collected fiom the stockpile for disposal analysis The samples were submitted to the laboratory to be composited and analyzed as one sample The diill cuttings weie iemoved by Integtated Wastestream Management (IWM) on November 19, 1998 to the BFI landitll in Liveimore, Califoinia 2 346463 01 2