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AO (11 <br /> 28 January 2005 <br /> 0 AGE-NC Project No 96-0232 <br /> Page 6of8 <br /> were detected from laboratory analysis <br /> The analytical results of selected soil samples are summarized in Tables 1, 2 and 3 The laboratory <br /> reports (Cal Tech Environmental Laboratories I D No 0412-029) and chain-of-custody forms are <br /> included in Appendix C <br /> 3 4 ANALYTICAL RESULTS OF WELL DEVELOPMENT WATER SAMPLES <br /> The ground water samples collected from MW-20A and MW-20B on 07 December 2004 after <br /> completion of momtonng well development were analyzed at CTEL for petroleum hydrocarbons and <br /> fuel additives <br /> TPH-g,TPH-d and TPH-mo were not detected from laboratory analysis of well development water <br /> samples <br /> BTEX constituents were not detected from laboratory analysis of well development water samples <br /> MTBE was detected in the water sample collected from MW-20A at a concentration of 230 µg/1 <br /> No other fuel components were detected above the laboratory reporting limits Analytical results of <br /> the ground water samples are summarized in Table 5 The laboratory reports (Cal Tech <br /> Environmental Laboratories I D No 0412-048) and chain-of-custody forms are presented in <br /> Appendix E <br /> 4.0. DISCUSSION AND CONCLUSIONS <br /> Previous soil characteristics data obtained by CPT investigation and soil bonng/momtorng well <br /> observations enabled AGE to define five informal hydrogeologrc flow units (Final Remediation <br /> Plan, dated 31 August 2000) in the area of the Flag City Chevron site The informal hydrogeologrc <br /> flow units were defined as First Zone(10-35 feet bsg),Second Zone(40-60 feet bsg),Rocky's Upper <br /> Zone (65-75 feet bsg), Secondary Aquifer Zone (85-105 feet bsg), and Primary Aquifer Zone <br /> (130-150 feet bsg) <br /> Based on the findings of this off-site soil sample investigation, AGE concludes <br /> • Generally, less permeable, fine sandy silts and clayey silts were encountered at a depth of <br /> 15 feet bsg and between 30 and 35 feet bsg, more permeable, silty fine sands and fine to <br /> medium sands were encountered at depths between 10 and 25 feet bsg (First Zone) and <br /> Advanced GcoEnvironmental,Inc <br />