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ATC Associates Inc. <br /> (: <br /> VYJRTC <br /> 1117 Lone Palm Avenue, Suite B <br /> Modesto,California 95351 <br /> 209-579-2221 <br /> A s s o c i A l e s I N C . fax: 209-579-2225 <br /> Deep-Screened MonitorinE Wells <br /> In August 2005, deep screened monitoring wells MW4 and MW5 were installed at the site. <br /> During the first two monitoring events, the groundwater samples collected from well MW5 <br /> contained detectable concentrations of TPHg, benzene, toluene, total xylenes, and/or 1,2-DCA. <br /> Subsequent monitoring events have indicated that these constituents have decreased to <br /> nondetectable concentrations. ATC concurs with EHD that a third monitoring well screened in <br /> the deeper zone is not justified at this time. ATC recommends continued monitoring of these <br /> wells of a quarterly basis. <br /> Report Preparation <br /> Upon completion of the well installation activities and vapor extraction events, a summary report <br /> will be prepared for submittal to the EHD. The report will include a description of all field <br /> activities, laboratory analytical results, and boring logs. Additionally, the report will include an <br /> the evaluation of the feasibility of vapor extraction and recommendations for future activities. <br /> All work described in this workplan will be performed under the direction of a California <br /> Registered Professional Engineer or Geologist. All work will be performed in accordance with <br /> ATC's Site Safety Plan (SSP) and Quality Control/Quality Assurance Plan on file with the EHD. <br /> Proiected Schedule <br /> Once approval of this workplan has been received, ATC will schedule drilling activities. ATC <br /> will notify the EHD at least 48 hours prior to beginning any field activities. The summary report <br /> will be submitted to EHD approximately six weeks after the completion of field activities. <br /> s:\14885\workp1ans\wkp1n 11-20-06.doc 6 <br />