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determined from depth to water measurements at the five on-site monitor wells on March <br /> • 29, 2001 The groundwater elevation has increased by an average of 1 69 feet at the five <br /> monitor wells since the previous quarterly monitoring round on December 6, 2000 The <br /> groundwater elevation gradient flows to the north northwest at a gradient of 0 0005 <br /> feet/linear foot as measured between MWS to MW 1 <br /> RESULTS OF CERTIFIED ANALYSIS OF GROUNDWATER SAMPLES <br /> No groundwater samples were obtained from the monitor wells (MW 1, MW2, MW3, <br /> MW4, and MW5) during this quarter Groundwater samples obtained from the <br /> "Geoprobe" borings will be presented in the 2nd Quarter 2001 report <br /> RECOMMENDATIONS <br /> 1) Conduct pump test at the newly installed groundwater recovery wells RIA and RIB <br /> to determine feasibility of dewatering during overexcavation of former UST area <br /> and/or dewatering in conjunction with vapor extraction <br /> 2) Conduct airsparging/vapor extraction pilot test using air sparging in conjunction with <br /> the installation of horizontal vapor collection piping within a backfilled trench that <br /> traverses the former UST area <br /> • LIMITATIONS <br /> The discussion presented in this report is based on the following <br /> 1 The observations and data collected by field personnel <br /> 2 The results of laboratory analyses performed by a state certified analytical laboratory <br /> 3 Our understanding of the regulations of San Joaquin County and State of California <br /> Changes in groundwater conditions can occur due to variations in rainfall, temperature, <br /> local and regional water use, and local construction practices In addition, variations in <br /> the soil and groundwater conditions could exist beyond the points explored in this <br /> investigation State Certified Laboratory analytical results are included in this report <br /> This laboratory follows EPA and State of California approved procedures, however, <br /> WEGE is not responsible for errors in these laboratory results <br /> The services performed by Western Geo-Engineers, a corporation under California <br /> Registered Geologist #3037 and/or Contractors License 9513857, have been conducted <br /> in a manner consistent with the level of care and skill ordinarily exercised by members of <br /> our profession currently practicing under similar conditions in the State of California and <br /> San Joaquin County Our work and/or supervision of remediation and/or abatement <br /> operations, active or preliminary at this site is no way meant to imply that we are owners <br /> or operators of this site Please note that the known contamination of soil and/or <br /> • <br /> 3 Sanchez I" QM 2001 <br />