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06 November 2003 <br /> AGE-NC Project No 98-0511 <br /> Page 2 of 5 <br /> • December 2000 - Four additional monitoring wells (MW-5 to MW-8) were Installed by <br /> AGE Since AGE began quarterly ground water monitoring at the site in March 1999, the <br /> Inferred ground water gradient has consistently been toward the northwest <br /> • November 2001 -AGE advanced three soil borings(135,B6 and B9)for collection of soil and <br /> ground water samples Petroleum hydrocarbon compounds were detected in the soil samples <br /> collected from boring B9, located east of the former UST location, in addition, high <br /> concentrations of petroleum hydrocarbons were detected in the ground water sample <br /> collected from boring B9 <br /> Based on analytical results of ground water samples collected during quarterly monitoring and site <br /> assessment activities, the lateral extent of impacted ground water has been defined north (MW-4), <br /> south(MW-2,MW-7 and MW-8) and west(B6)of the site However,the lateral extent of impacted <br /> ground water has not been defined east of the site <br /> Complete background information and details of previous investigations at the site is included in the <br /> report titledlnterim Secondary Source Removal and Monitoring Well Replacement,dated 05 October <br /> 1995 and various quarterly reports prepared by AGE and WHF, Inc <br /> 3.0. SCOPE OF WORK <br /> AGE proposes to advance two soil probe borings using direct push technology to approximately <br /> 20 feet bsg for collection of soil and `grab' ground water samples, the proposed locations of the soil <br /> borings are presented on Figure 2 The scope of work will include the following tasks <br /> • Permitting and pre-field work activities, <br /> • Soil boring advancement <br /> • Soil sample collection and analysis, and <br /> • Report preparation <br /> Each of these tasks are discussed below <br /> 3 1 PERMITTING AND PRE-FIELD WORK ACTIVITIES <br /> Applicable site assessment and encroachment permits will be obtained from the San Joaquin County <br /> • Environmental Health Department (SJCEHD) and City of Lathrop,respectively An update to the <br /> health and safety plan presently on-file will be prepared in accordance with Occupational Safety and <br /> Advanced GeoEnvironmental,Inc <br />