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Mr George Takemori Project OF90-002 04 <br /> May 1, 1995 <br /> Page 2 <br /> Between December 1987 through December I994, following the removal of the tanks, soil borings <br /> were drilled and ten groundwater monitoring wells were installed to characterize the lateral and vertical <br /> extent of soil and groundwater impact (EMCON, Problem Assessment Report and Final Remediatton <br /> Plan, December 16, 1992) Dissolved hydrocarbons were detected in the vicuuty of the UST's. Well <br /> VIW-I was damaged, and well MW-2 was destroyed during removal of this soil <br /> In October 1993, EMCON performed a ,oil vapor extraction test (EMCON, Problem Assessment <br /> Report and Final Remediation Plan, December 16, 1992) Results of the test indicate that soil <br /> remediation using vapor extraction is feasible <br /> SCOPE OF WORK <br /> Field work will be conducted using Tri-Regional Guidelines and EMCON's Health and Safety <br /> Plan Field Procedures are presented in Attachment A EMCON will conduct the following <br /> PREFIELD ACTIVITIES <br /> • EMCON will obtain drilling permits from the San Joaquin County Public. Health Services <br /> Environmental Health Division <br /> • EMCON will notify Underground Service Alert of its intent to drill at least 48 hours <br /> before drilling to identify the location of underground utilities <br /> FIELD OPERATIONS <br /> Installation of Air Sparge Well <br /> • EMCON will install one air sparge well at the site adjacent to the treatment area in an <br /> area of known dissolved hydrocarbon impact (see Figure 1) An 8-inch boring will be <br /> drilled to a depth of approximately 85 feet below ground surface (bgs) Continuous <br /> geological sampling will be conducted from first-encountered groundwater to the total <br /> depth of the well The air sparge well will be located adjacent to an existing monitoring <br /> well (MW-14), therefore, soil above groundwater will be logged from drill cuttings In <br /> addition, since the area has known hydrocarbon impact, an!%-ucal samples will not be <br /> collected from the boring The soil samples will be classified using visual and manual <br /> methods according to the Unified Soil Classification System <br /> 5A(VJftFWF9000204AS-95 PAS 2 <br />