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i ' 09 October 2000 • AGE-NC Project No 98-0534 ' Page 4 of 6 ' MW3, MW6, MW7 and MW8 Saturated conditions were encountered between 25 and 30 feet bsg A stratigraphic cross section is depicted on Figure 3 tPetroleum hydrocarbon odor was not noted in the samples collected, however due to lugh soil moisture, organic vapor was detected in the soil samples either due to local ambient organic vapor or high sensitivity from the filed PID The PID data were available is included on the boring logs (Appendix A) ' 32 ANALYTICAL RESULTS OF SOIL SAMPLES ' TPH-g and BTEX compounds were not detected above laboratory reporting limits in any of the soil samples collected and analyzed TPH-d was only detected in sample MW6-20 (boring MW6,20 foot depth) at 1 2 mg/kg ' MTBE was only detected in samples MW6-15 and MW6-20 at 170 microgram per kilogram(,ug/kg) and 78 ug/kg, respectively TBA was detected in sample MW6-15 at 78 µg/kg No other oxygenates were detected in any of the remaining soil samples analyzed Analytical results of soil samples are summarized in Table 2 and Table 3 The laboratory reports (MAI Laboratory I D No 43975-43996),quality assurance and quality control (QA/QC) reports and chain-of-custody forms are included in Appendix B 3 3 GROUND WATER ELEVATION AND GRADIENT ' The average relative ground water elevation on 18 August 2000 was approximately 5 feet with an average depth of 10 38 feet below well casing grade The top of the ground water table occurred within the screened intervals of the wells Ground water was inferred to be flowing to the south and ' southwest (Figure 3) with a nearly flat hydraulic gradient of 0 003 feet/feet 3 4 ANALYTICAL RESULTS OF GROUND WATER SAMPLES I TPH-g was not detected in any of the ground water samples TPH-d was only detected in samples MW-4 and MW-6 at 110 µgll and 82 µgll, respectively Of the BTE&X compounds, only toluene was detected in sample MW-4 at 0 63 micrograms per liter lie I Advanced GeoEnvironmentai,Inc