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31 January 1997 <br /> AGE-NC Project No 95-0125 <br />! Page 7 of 7 <br /> Previous trends of the analytical data collected from the monitoring wells at the site confirm <br />! the current trend Sampling of monitoring wells surrounding the impacted wells have <br /> demonstrated the stability of the dissolved hydrocarbon plume, within the constraints of the <br />! monitoring well locations <br /> • The on-site aeration of excavated soil under permit from the SJVUAPCD was apparently <br /> successful The analytical data from soil samples collected from the stockpiled soil within <br />! the aeration treatment cell indicates that petroleum hydrocarbons have volatilized out of the <br /> soil <br /> 5 2 RECOMMENDATIONS <br /> Based upon the results of the investigation, AGE has the following recommendations <br /> • Although low concentrations of petroleum hydrocarbons remain near the north end of the <br /> December 1995 excavation, we do not recommend active remediation of the residual <br /> petroleum hydrocarbon impacted soil The soil stockpiled will be utilized for clean fill by the <br /> Lammersville School District <br /> • Dissolved hydrocarbons have dissipated or migrated from the previously impacted <br />' monitoring wells, yet the dissolved hydrocarbon plume is stable within the constraints of the <br /> monitoring well locations Therefore AGE recommends no further sampling of the ground <br /> water monitoring wells The monitoring wells should be abandoned in accordance with the <br /> San Joaquin County well ordinance and county building codes <br /> • AGE recommends that the PHS-EHD issue certified site closure <br /> 6.0. LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing in this or similar localities The findings were based mainly <br /> upon analytical results provided by an independent laboratory Evaluations of the <br /> geologic/hydrogeologic conditions at the site for the purpose of this investigation are made from a <br /> limited number of available data points(i a monitoring wells) and subsurface conditions may vary <br /> away from these data points No other warranty, expressed or implied, is made as to the professional <br /> recommendations contained in this report <br />