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Mr Paul Supple Project 20805-140.006 <br /> January 28, 1998 <br /> Page 4 <br /> Well Development and Sampling <br /> EMCON will develop and sample each groundwater monitoring well The initial sampling <br /> will occur a nurnmm of 24 hours after well development Groundwater samples collected <br /> from the new wells will be analyzed for TPHG using USEPA Method 8015, and BTEX <br /> and MTBE using USEPA Method 8020 ARCO performed oxygenate analysis of samples <br /> collected from wells MW-1 and MW-5 during the fourth quarter 1997 monitoring event. <br /> Analytical results shown that MTBE is the only oxygmate present, therefore, additional <br /> n ysis using USEPA Method 8260 will not be conducted These wells will be <br /> added to the quarterly monitoring program EMCON's groundwater sampling field <br /> b procedures are presented in the appendix In addition, a licensed surveyor will be <br /> contracted to survey the locations of the wells with respect to mean sea level <br /> DATA EVALUATION AND REPORT PREPARATION ` <br /> The results of this investigation will be presented in an assessment report prepared at the <br /> completion of this additional investigation The report will include tabular summaries of <br /> . analytical results, revised geologic cross-sections depicting subsurface conditions, and <br /> copies of boring logs, well details, and analytical reports <br /> Please do not hesitate to call if you have any questions regarding this workplan <br /> Sincerely, <br /> EMCO <br /> Mark Ca ps Ja Johnson <br /> Project Geologist Senior Project Supervisor <br /> R G 6561 R G 5867 <br /> Attachments Figure 1 Site Location Map <br /> Figure 2 Site Plan <br /> Appendix A Field Procedures <br /> cc Mary Maeys, San Joaquin County Public Health Services <br /> Elizabeth Thayer, California Regional Water Quality Control Board, <br /> Central Valley Region <br /> • <br /> SACH TM805\08051400 6AS-98Nebell 2 <br />