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i4) Conduct pump test at existing on-site monitor well to determine feasibility of <br /> dexiatering during overexcavation of former UST area and/or dewatering in conjunction <br /> w i t h vapor extraction <br /> 5) Conduct airsparging/vapor extraction pilot test using existing monitor \%ells foi air <br /> sparging in conjunction with the installation of horizontal vapor collection piping within <br /> a shallow trench that traverses the former UST area <br /> LIMITATIONS <br /> The discussion presented in this report is based on the following <br /> 1 The obsen ations 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 be}ond the points explored in this <br /> ins estigation 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 4513857, have been conducted <br /> in a manner consistent NNith the level of care and skill ordinarily e\eicised 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 /> of operators of this site Please note that the known contamination of soil and/or <br /> groundwater must be reported to the appropriate agencies in a timely manner No other <br /> warranty e\pressed or implied is made <br /> If you have any questions concerning this report or if we can be of further assistance, <br /> Please do not hesitate to contact us at (530) 668-5300 <br /> NA,PER <br /> A <br /> xt N3037 <br /> G <br /> ack E Napper ,� David Threlfall <br /> R G #3037 Project Geologist <br /> 4 Sanchez QM 7-9 1999 <br />