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Flying 3 Travel Plaza <br /> ` pRELE IINARY SITE INVESTIGATION Ripon,CA <br /> c. 5.0 CONCLUSIONS AND RECOMMENDATIONS <br /> The following summarizes our findings, conclusions and recommendations. <br /> 5.1 Summary of Findings <br /> k� <br /> • Subsurface Soil Conditions: Based on soil classification logs maintained during drilling, <br /> subsurface soils consist predominantly of silty sand (Appendix A). The sand was very <br /> fine to coarse grained and from approximately 15 to 25 feet, it was inter-bedded with <br /> clayey silt lenses. f <br /> �- • Ground water: Ground water was encountered in each boring at a depth of <br /> approximately 24 feet bgs. 31, G e L 41r <br /> J3-1 15' <br /> • Field Observations: PID readings were generally less than 1 part per million, and there <br /> was no hydrocarbon odors detected in any of the samples screened. <br /> i� <br /> V <br /> • Laboratory Analytical Results: Laboratory analytical results indicated TPH-GRO, TPH- <br /> DRO, BTEX and fuel oxygenates were not detected in any of the soil samples analyzed. <br /> For the two groundwater samples, TPH-DRO was detected in one of the samples at a <br /> concentration of 45 1,Lg/L. No other petroleum hydrocarbon constituents were detected <br /> in either groundwater sampled s( ' <br /> 5.2 Conclusions and Recommendations <br /> Based on findings of this investigation, the following conclusions and recommendations are <br /> provided: <br /> • Hydrocarbon Impacted Soil - Based on laboratory analytical data and field observations, <br /> the hydrocarbon impacts identified in a shallow soil sample collected from beneath the <br /> 16. diesel dispenser on the south end of the RV islands is localized and does not appear to <br /> extend vertically beyond less than five feet below the ground surface. At this time, OGI <br /> does not recommend any further investigation. <br /> • Hydrocarbon Impacted Groundwater - One groundwater Sample contained TPH-DRO <br /> at a concentration of less than one milligram per kilt' f'am. Because the sample was <br /> collected from an open boring, it is possible that the shallow impacts encountered <br /> beneath the dispenser during previous investigation may have been introduced into the <br /> #- open boring sample as a result of the drilling activities. Based on the data collected, it <br /> does not appear that groundwater impacts are likely. The second boring, drilled within <br /> FLYINzG J INC. 8 OGI Project No. OGI-09-191 <br />