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USA 65 QTR RPT JUL' 94 <br /> is Ground water at the site is currently in a discharge cycle <br /> Previous discharge and recharge cycles at the site have produced <br /> sporadic traces of TFH or BTEX constituents in some of the <br /> monitoring wells Currently, analytical results from MW3 , MW4 <br /> and MW6 have detected no TFH or BTEX during this period, with the <br /> exception of MW8, which is closest to the tank field The water <br /> samples from MW8 have shown elevated values for these <br /> constituents and it should be noted that a product sheen was <br /> Observed at the time of purging for ground water collection (see <br /> Field Notes in Appendix A) <br /> CONCLUSIONS <br /> 1 Your monitor wells were sampled MW3 , MW4 and MW6 showed no <br /> detectable levels of contamination <br /> 2 MW8 indicated elevated levels of Total Fuel Hydrocarbons as <br /> gasoline of 200 ppm and Benzene of <10000 ppb <br /> 3 The ground water flow direction is presently in a south, <br /> southeasterly direction from MW4 to MW7 with a ground water <br /> ' low' at MW8 and a ' high' at MW4 The current elevation <br /> gradient between MW4 and MW7 averages 0 003 feet per linear <br /> foot <br /> 4 S1 and S2 were not sampled, these wells were dry <br /> LIMITATIONS <br /> The discussion and conclusions presented in this report are based <br /> on the following <br /> 1 The observations and data collected by field personnel <br /> 2 The results of laboratory analyses performed by a state <br /> certified lab <br /> 3 Our understanding of the regulations of the State of <br /> California and San Joaquin County and/or City of Lodi , <br /> California <br /> 4 Review of existing literature concerning this site and the <br /> San Joaquin County area <br /> Changes in ground water conditions can occur due to variations in <br /> rainfall, temperature, local and regional water usage and local <br /> construction practices . In addition, variations in the soil and <br /> ground water conditions could exist beyond the points explored in <br /> this investigation <br /> 5 <br /> f <br />