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• 10 August 2004 <br /> AGE-NC Project No 96-0232 <br /> Page 8 of 10 <br /> 3 5 ANALYTICAL RESULTS OF WELL DEVELOPMENT WATER SAMPLES <br /> A total of two monitoring well development samples collected from MW-19A and MW-19B were <br /> frsubmitted to Cal Tech Environmental Laboratories, a DHS-certified-laboratory for analysis of _ <br /> petroleum hydrocarbons <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 samples collected from MW-19A and MW-19B at concentrations <br /> of 5,300 �Lg/l and 58 µg/1, respectively <br /> No other fuel components were detected above the laboratory reporting limits Analytical results of <br /> the ground water samples are summarized in Table 6 The laboratory reports (McCampbell <br /> Analytical, Inc work order 0405340) and chain-of-custody forms are presented in Appendix E <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> Previous soil characteristics data obtained by CPT Investigation and soil boring/monitoring well <br /> observations enabled AGE to define five informal hydrogeologic flow units (Final Remediation <br /> Plan, dated 31 August 2000) In the area of the Flag City Chevron site The Informal hydrogeologlc <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 /> The findings of the soil sample investigation results are as follows <br /> • Generally, less permeable, fine sandy silts and clayey silts were encountered at depths <br /> between 5 and 10 feet bsg and between 25 and 35 feet bsg, more permeable, silty fine sands <br /> and fine to medium sands were encountered at depths between 10 and 25 feet bsg (First <br /> Zone) and between 35 and 50 feet bsg (Second Zone) Geologic cross section E-E'depicts <br /> the informal hydrogeologlc units beneath the site (Figure 3) <br /> • TPH-d was detected in the 30-foot soil sample collected from boring P-41 (near well MW-8) <br /> at a concentration of 1 7 mg/kg <br /> • MTBE was detected in soil from borings P-40A (30 feet and 45 feet), P-41 (30 feet), P-43 <br /> (30 feet)and MW-19 (18 feet and 30 feet)at concentrations as high as 0 39 mg/kg(P43-30) <br /> Advanced GeoEnvironmentai,Inc <br />