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26 July 1999 <br /> . AGE-NC Project No 97-0301 <br /> Page 7 of 9 <br /> are Included in Appendix B <br /> The estimated extent of dissolved TPH-g concentrations and of dissolved TPH-d concentrations are <br /> depicted In plan view in Figure Nos 5 and 6, respectively <br /> 5.0. SUMMARY AND CONCLUSIONS <br /> Based on review of a regional ground water elevation map published by the SJCFCD,the prevailing <br /> ' ground water flow direction in South Stockton Is generally toward the northeast <br /> Based upon data collected on 03 June 1999, AGE concludes the following <br /> 1 • First encountered ground water is approximately 371/2 feet bsg, first observed saturated soil <br /> was encountered at 40 feet bsg <br /> ' • General lithology beneath the site is depicted in cross sectional view on Figures 3 and <br /> consists of brown, damp to moist, fine sandy silt was encountered from 5 feet bsg to depths <br /> �. of approximately 10 feet bsg Between 10 feet bsg and 20 feet bsg, a brown, damp to moist, <br /> silty fine sand was encountered A brown, damp to moist, fine sandy silt was encountered <br /> from 20 feet bsg to depths of approximately 30 feet bsg Between 30 feet bsg and 40 feet bsg, <br /> a brown, moist to saturated, silty fine sand was encountered At depths in excess of 40 feet <br /> bsg, a brown, moist to saturated, silty fine sand/fine sandy silt was encountered <br /> • Faint to intense petroleum hydrocarbon odor and vapor were noted in soil and grab ground <br /> water samples collected from probings P-1, P-2 and P-4 <br /> • The approximate horizontal and vertical extent of petroleum-impacted soil Is depicted on <br /> ' Figure 4 and is based on laboratory data and field evidence noted on boring logs (I a vapor <br /> detection, petroleum odor) <br /> • TPH-g was detected In soil samples collected from probe boring P-1 at concentrations <br /> ranging as high as 330 mg/kg, TPH-d was detected in soil samples collected from P-1 at <br /> concentrations ranging as high as 190 mg/kg The estimated extent of adsorbed TPH is <br /> ' depicted in cross sectional view A -A'in Figure 4 <br /> • The laboratory reported that unmodified or weakly modified gasoline was significant In soil <br /> and ground water samples analyzed, the laboratory reported that the diesel chromatograms <br /> for the samples did not have typical diesel characteristics, that gasoline range compounds <br /> were significant and that the medium boiling point patterns did not match diesel, but were <br /> more typical of kerosene in the TPH-d soil and ground waters <br /> • BTEX compounds were detected in soil samples collected from P-1 and P-4 at <br /> Adranred GeoEm iron mental,Inc <br /> 1 <br />