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i«1 • •.lase 11 Environmental Site Assessment Heritage Square Page 5 groundwater sample was discharged directly from the tubing into laboratory supplied sample containers. All groundwater sample containers were sealed, labeled, and placed in a cooler chilled with Blue Ice and delivered under chain -of -custody procedures to Excelchem. The samples were'analyzed using U.S. EPA and California approved methods. All groundwater samples were collected using the "grab" method. The groundwater was not purged prior to sampling and the samples were not composited. 4.4 LABORATORY ANALYSES The soil samples collected from boring B-1 through B-4 that were selected for analyses were analyzed discretely. The discrete soil samples collected and retained from borings B-1 through B-4 and the composite soil samples collected and retained from borings B-5 through B-8 were analyzed for total petroleum hydrocarbons quantified as diesel (TPH-D), motor oil (TPH-MO), and kerosene (TPH-K) by EPA Method 8015m; and for benzene, toluene, ethyl benzene, total xylenes (BTEX), and methyl tertiary - butyl ether (MTBE) by EPA Method 8020. The soil samples collected from the hand auger borings C-1 through C-4 were analyzed for total petroleum hydrocarbons quantified as gasoline (TPH-G) by EPA Method 8015m and total lead by Method 200.7 in addition to the aforementioned hydrocarbon constituents. The discrete soil samples comprising the composite sample with the highest contaminant concentrations (sample B -5 -11',B -5-15.5',B-5-20') were subsequently analyzed discretely for TPH-D, TPH-MO, and TPH-K. The discrete sample collected from B-5 and the discrete sample from borings B-1 through B-4 with the highest contaminant concentrations were further analyzed for the 17 California Administrative Manual (CAM) metals by EPA Methods 601013 and 7471 A. The groundwater samples collected from borings B-3 and B-5 were analyzed for TPH-D, TPH-MO, and TPH-K by EPA Method 8015m, and for BTEX and MTBE by EPA Method 8020. The grab sample collected from the abandoned well located on site was analyzed for TPH-D and TPH-G by EPA Method 8015m, and for BTEX by EPA Method 8020. 5.0 INVESTIGATION RESULTS The results of the soil and groundwater investigation include field observations and soil and groundwater sample laboratory analytical results. 5.1 FIELD OBSERVATIONS Field observations included PID screening results, detection of sample odors, and visual observations of the site geology. Field observations are included on the geologic logs prepared for all of the borings (Appendix B). Soils encountered in the borings were predominantly tight clays with infrequent occurrences of sand and silt in varying amounts. PID measurements of samples from the borings indicated organic vapor concentrations of 0 to 42 parts per million (ppm) in B-3, 0 to 3.1 ppm in B-6, and 0 to 5.7 ppm in B-7. PID measurements for samples from all other borings were 0 ppm. Petroleum hydrocarbon staining of soils was observed in boring B-3, coinciding with the PID measurements that indicated the presence of organic vapors. A slight petroleum odor was noted in the soil from boring B-3, as well. No odors or visual evidence of contamination were noted in the water samples collected from boring B-3 or B-5, or from the abandoned well. 5.2 RESULTS OF LABORATORY ANALYSES The laboratory analytical results of the soil and groundwater samples for hydrocarbon constituents and total lead are presented in Table 2, on the next page. The laboratory analytical results of the soil samples for CAM 17 metals are included in Table 3, on page 7. Copies of laboratory analytical results and chain - of -custody records for the samples are included in Appendix C. CONDOR