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. Benzene concentrations ranged from a maximum of 1400 ug/I at MW1 to less than the laboratory <br /> detection limits of 0 5 ug/1 at the remaining four monitor wells <br /> MTBE concentrations ranged from a maximum of 90 ug/1 in MW1 to less than laboratory detection <br /> limits of 5 ug/l in the remaining four monitor wells <br /> Figure 5 shows the distribution of TPH-G, BTEX, and MTBE in groundwater and the lateral limits <br /> of the TPH-G in groundwater as determined from groundwater samples collected on March 18, <br /> 1998 The increase in groundwater elevations since the previous quarterly monitoring round in <br /> December 1997 has been accompanied by an decrease in TPH-G and BTEX concentrations at <br /> M W 1, while the remaining wells show no analytes above laboratory detection limits <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 the State of California <br /> Changes in groundwater conditions can occur due to variations in rainfall, temperature, local and <br /> regional water use, and local construction practices In addition, variations in the soil and <br /> groundwater conditions could exist beyond the points explored in this investigation State Certified <br /> Laboratory analytical results are included in this report <br /> This laboratory follows EPA and State of California approved procedures, however, WEGE is not <br /> responsible for errors in these laboratory results <br /> The services performed by Western Geo-Engineers, a corporation under California Registered <br /> Geologist #3037 and/or Contractors License #513857, have been conducted in a manner consistent <br /> with the level of care and skill ordinarily exercised by members of our profession currently <br /> practicing under similar conditions in the State of California and San Joaquin County Our work <br /> and/or supervision of remediation and/or abatement operations, active or preliminary at this site is <br /> no way meant to imply that we are owners or operators of this site Please note that the known <br /> contamination of soil and/or groundwater must be reported to the appropriate agencies in a timely <br /> manner No other warranty expressed or implied is made <br /> If you have any questions concerning this report or if we can be of further assistance, please do not <br /> hesitate to contact us at (530) 668-5300 <br /> ED GFO��r <br /> .ACK " 1 <br /> 1 l`a 3037 } <br /> r <br /> . Jack E Napper David Threlfall <br /> R G #3037 Project Geologist <br /> 3 Sanchez QM 3-98 <br />