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1 I • 24 March 2004 AGE-NC Project No 97-0301 Page 6 of 7 I I ' 3 3 SOIL SAMPLE ANALYTICAL RESULTS A total of thirty-onesoil samples were submitted to a State of California Department of Health ' Services-certlfled laboratory (Cal Tech Environmental Laboratories) for analysis of petroleum hydrocarbons and total lead ' TPH-g was detected in soil samples collected from MW-8 at 20 and 35 feet bsg at concentrations of 310 mg/kg and 6 4 mg/kg, respectively TPH-k was detected in the soil sample collected from MW-8 at 20 feet bsg at a concentration of 470 mg/kg ' Various BTEX compounds were detected in soil samples collected from MW-8 at depths between 20 and 65 feet bsg at concentrations as high as 5 4 mg/kg,iow concentrations of xylenes were ' detected from MW-12 at 50 feet and 80 feet bsg at concentrations of 0 02 mg/kg and 0 012 mg/kg, y respectively ' 1,2-DCA was detected in a soil sample collected from MW-8 at 35 feet bsg at 0 036 mg/kg No other fuel components were detected from the laboratory analysis Analytical results of soil samples are summarized to Table 2 The laboratory reports(Cal Tech Environmental Laboratories I D 0307-069, 0 0307-070, 0309-019 and 0307-071) and chain-of-custody forms are included In Appendix E The estimated extent of petroleum hydrocarbon-impacted soil is depicted in cross-sectional views ' D-D'and F-F'in Figures 15 and 16, respectively 4.0. SUMMARY AND CONCLUSIONS i ' The results of the July and September 2003 multi-level well installation are as follows • AGE installed, developed and surveyed five multi-level ground water monitoring wells (MW-8 through MW-12),generally,four of the five CMT chambers were utilized to install ' screen intervals at depths of between 35 and 45 feet bsg(First Water Zone), 65 and 75 feet bsg(Second Water Zone),95 and 100 feet bsg(Third Water Zone)and between 120 and 125 feet bsg (Fourth Water Zone) r • Saturated soil at the site was encountered between 40 feet and 45 feet bsg The static water level was measured at approximately 33 feet below the tops of the monitoring well casings ' • Cross sectional views D-D'and F-F'were generated from current and previous investigation and depict general lithology beneath the site (Figures 3 and 4,respectively) Generally, less ' permeable, very stiff to hard, fine-grained, sandy, clayey SILT was generally observed between surface grade and 35 feet bsg, 50 and 60 feet, 80 and 90 feet and 100 and 110 feet . bsg, conversely, a permeable, dense to very dense, poorly graded, fine to medium I ' advanced GeoEnvironmental,Inc I � 1