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OBSERVATIONS AND ANALYTICAL RESULTS <br /> No free-phase liquid hydrocarbon layer or sheen was seen on the water tape during the <br /> measurement of any of the groundwater monitoring wells In addition, all purged and sampled <br /> water appeared to be clear and lacked any odor (Appendix B) <br /> The depth-to water measurements indicate that the early seasonal rainfall has increased <br /> the standing height of water in each monitoring well by over three feet, causing the groundwater <br /> gradient to steepen slightly as compared to the September samplings The gradient continues to <br /> slope toward the north-northeast but now at approximately one foot per three hundred feet <br /> (Figure 2) <br /> The laboratory results are non-detect for BTEX and TPH-diesel (<0 5 micrograms per <br /> liter (µg/L) and <50 µg/L, respectively) for all of the groundwater samples extracted from the <br /> wells The results of the laboratory analyses are presented in Table 1 A copy of the laboratory <br /> analytical report and the chain-of-custody record is included in Appendix A <br /> CONCLUSION <br /> The laboratory results for this sampling period are consistent with the findings presented <br /> to EHD as reported in First Quarter 2003 Sampling Report RMC Pacific Materials <br /> Kerlinger Aggregate Plant(August 19, 2003), Groundwater Monitor Wells Second Quarter <br /> 2003 Sampling Report (January 8, 2004) and First Quarter 2004 Monitoring Report (March <br /> 16, 2004) <br /> This quarter's results again contradict the Second Quarter 2004 Monitoring Report <br /> (August 26, 2004) in which the laboratory reported finding TPH-diesel at 89 µg/L in the sample <br /> extracted from MW-06 and TPH-diesel at 99 tig/L in the sample extracted from MW-08 <br /> Except for the samples reported in the Second Quarter 2004 Monitoring Report, the <br /> cumulative results for sampling and analysis at the facility are non-detect for all analytes The <br /> local groundwater beneath the former asphalt plant has likely not been affected by the petroleum <br /> contamination discovered in the upper surface soil Iayers during the 2002 installation of the <br /> monitor wells <br /> Quarter 4 Sampling Report-2004 <br /> Page 2 of 2 <br />