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October 24,2011 2 <br /> Cardno ERI 278913.Q113 Former Mobil Service Station 99CAS,Stockton,California <br /> CONCLUSION <br /> Groundwater elevations at the site are currently near the maximum level recorded during the monitoring <br /> program. TPHd concentrations in on-site well MW3 and TPHg and BTEX concentrations in off-site wells MW7, <br /> MW8, and MW4 are not consistent with historical site data and will be confirmed during the fourth quarter. The <br /> remaining results are consistent with historical data for the site. <br /> The groundwater flow direction in the shallow zone is towards the east under a hydraulic gradient of 0.003. The <br /> groundwater flow direction in the deep zone is towards the northeast under a hydraulic gradient of 0.003. <br /> Drilling activities were being conducted at the time of monitoring and sampling and wells MW4, DW1, DW3, <br /> EX1, and EX2 were inside the exclusion zone; therefore, DTW was measured, but groundwater samples were <br /> not collected. Monitoring well MW6 could not be located in the field; therefore, the well was not gauged or <br /> sampled during the third quarter. <br /> LIMITATIONS <br /> For any documents cited that were not generated by Cardno ERI, the data taken from those documents is used <br /> ,.as is" and is assumed to be accurate. Cardno ERI does not guarantee the accuracy of this data and makes no <br /> warranties for the referenced work performed nor the inferences or conclusions stated in these documents. <br /> This document was prepared in accordance with generally accepted standards of environmental, geological, <br /> and engineering practices in California at the time of investigation. No soil engineering or geotechnical <br /> references are implied or should be inferred. The evaluation of the geologic conditions at the site for this <br /> investigation is made from a limited number of data points. Subsurface conditions may vary away from these <br /> data points. <br /> Please contact Mr. Greg A. Gurss, Cardno ERI'S project manager for this site, at re urss cardno.com or at <br /> (707) 766-2000 with any questions regarding this report. <br /> Sincerely, <br /> Oft <br /> 55�4�1A��Fr7 <br /> CA N D <br /> * Na. 73 <br /> �� <br /> Jennifer L. Lacy David R. Daniels FCFCALft <br /> Senior Staff Scientist P.G. 8737 <br /> for Cardno ERI for Cardno ERI <br /> 707 766 2000 707 766 2000 <br /> Email: iennifer.lacyC@cardno.com Email:david.daniels(cD-cardno com <br />