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5.0 CONCLUSIONS AND RECOMMENDATIONS <br /> 5.1 Conclusions <br /> • No detectable levels of TPHd, TPHg, BTEX or gasoline oxygenate additives were found in the <br /> soil. This evidence suggests that the soil in the vicinity of the former UST has not been <br /> significantly impacted by petroleum hydrocarbons. The minor concentrations of petroleum <br /> hydrocarbons detected during UST removal have apparently degraded. <br /> • Groundwater was initially encountered at a depth of approximately 15 feet bgs and did not appear <br /> fluctuate. Laboratory analyses confirmed that groundwater beneath the site has not been impacted <br /> by TPHd, TPHg,BTEX or gasoline oxygenate additives in the vicinity of the former UST. <br /> 5.2 Recommendations <br /> Based on the results of this investigation, no residual petroleum hydrocarbons or oxygenate additives <br /> are evident in the soil or groundwater. Ground Zero recommends case closure with no further action. <br /> If you have any questions regarding this investigation, please contact Ground Zero at your <br /> convenience. <br /> Respectfully, <br /> Ground Zero Analysis, Inc. <br /> eY, `� ED G£O�O <br /> Staff ogist <v�' C�cP <br /> GREGORY P. <br /> STAHL <br /> * No. 5023 <br /> gory P. Stahl,RG 5023 <br /> CAeCertified Hyd ogeo ogist 264 �lgrF OF CA <br /> i <br /> Attachments <br /> PC fun Salmon,Manteca Equipment Rental <br /> Mark List, Regional Water Quality Control Board <br /> i <br />