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Flying J Travel Plaza PRELIMINARY SITE INVESTIGATION Ripon,CA Quality assurance/quality control procedures were maintained during sampling. Appropriate ; chain-of-custody Prot col wjis maintfqined throughout sample handling activities. I Followin completion of drilling and sampling activities, each boring was backfilled using a 3 bentonite slurry. The surface was patched using concrete. Drill cuttings removed from each boring were placed into 55-gallon drums and temporarily stored onsite. u 4.2 Laboratory Analysis F Eight soil samples and two groundwater samples were submitted for laboratory analysis to Environmental Science Corporation of Mount Juliet, Tennessee a California certified laboratory. The soil and groundwater samples were analyzed for total petroleum I hydrocarbons-gasoline range organics (TPH-GRO) and total petroleum hydrocarbons-diesel , range organics (TPH-DRO) by EPA Method 8015; and the volatile organic compounds F benzene, toluene, ethylbenzene, total xylenes (collectively. referred to as BTEX), and fuel oxygenates, including methyl tertiary butyl ether (MTBE)-by EPA Method 8260B. Results I were requested on a standard-5 day turnaround time. 4.2.1. Laboratory Analytical Results Laboratory analytical results are .summarized in Table 1. A copy of the laboratory analytical rrreport and chain of custody are included in Appendix B. The following summarizes the L laboratory analytical results: • TPH-GRO and TPH.-DRO were not detected in any of the soil samples analyzed. i I • There were no BTEY or fuel oxygenates detected in any of the soil samples analyzed. • TPH-DRO was detected in one of the groundwater samples at a concentration of 45 micrograms per, liter. (µg/L). No other constituents were detected in either groundwa er sarriple. M I TYING J INC. 7 OGI Project No.OGI-09-191 1 1