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3 0 CONCLUSIONS, RECOMMENDATIONS AND PROJECT ST <br /> • ATUS <br /> Since the three on-site monitoring wells were last monitored and sampled in January <br /> 2000, the groundwater surface has risen an average of 1 29 feet, and the groundwater <br /> flow direction and gradient have remained relatively constant Since the wells were last <br /> sampled, the concentrations of gasoline hydrocarbons have increased slightly in MW-2 <br />' and decreased moderately in MW-3 <br /> The results of the groundwater sample analyses indicate that the lateral extent of <br /> impacted groundwater remains undefined to the north (upgradient), west and south <br /> (downgradient) of the former UST excavation However, the lateral extent is defined to <br /> the northeast of the former USTs by MW-1 Vertically, the extent of impacted <br /> groundwater also remains undefined <br /> On December 13, 1999, Ramage Environmental submitted Work Plan, Environmental <br /> Site Investigation to PHS/EHD and RWQCB Tasks outlined in the work plan included a <br /> t geophysical survey to further delineate metal debris in the former UST excavation, <br /> sensitive receptor survey, installation of three additional groundwater monitoring wells to <br /> further define the lateral extent of impacted groundwater, continued quarterly monitoring <br /> lie and sampling of the monitoring well network, and cone penetration testing to delineate <br /> the vertical extent of impacted groundwater <br /> On March 27, 2001, Ramage Environmental submitted to PHSIEHD, Status Report and <br /> Work Plan Addendum, which documented the results of the single on-site CPT boring <br /> and outlined an expanded scope of work The additional tasks included re-positioning <br /> two monitoring wells onto the San Joaquin County Fairgrounds property south of the site, <br /> and additional CPT borings on-site and in the center lane of Charter Way On April 30, <br /> 2001, PHSIEHD approved the work plan addendum <br /> Currently, the cost of the additional work is pending cost pre-approval by the UST <br /> Cleanup Fund, and project permits are being obtained from the city of Stockton and <br /> PHSIEHD <br /> In addition to these approved corrective action tasks, Ramage Environmental <br /> recommends that the well network continue to be monitored and sampled on a quarterly <br /> basis The next monitoring and sampling event will be in July 2001 <br /> 8 <br />