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l <br /> Ms. Lori Duncan <br /> July 26, 2006 <br /> Page 6 of 6 <br /> GROUNDATER MONITORING AND SAMPLING PLAN <br /> BBL has evaluated the results of the recent Quarterly Monitoring Reports for the site, and proposes the <br /> following modified sampling and analysis plan for future groundwater monitoring program events at the <br /> site: <br /> • Quarterly monitoring of groundwater levels from the entire monitoring well network. <br /> • List of monitoring wells to be sampled on a quarterly basis: MW-1, MW-2, MW-3, MW-4, MW- <br /> 5,and MW-6(once installed and developed). <br /> • The list of analytes for all groundwater samples will include: TPH-D (CIO-C28) by United States <br /> Environmental Protection Agency (USEPA) Method 8015 Modified, and TPH-G (C6-C10) and <br /> BTEX by USEPA Method 8260B. Oxygenate compounds have not been detected in the <br /> groundwater samples at appreciable concentrations; therefore, will not be analyzed for during <br /> future monitoring events. <br /> • Request coordination of monitoring dates with the Unocal #0187 site, so that the groundwater <br /> elevation data can utilized to better evaluate flow directions. <br /> Groundwater samples were collected in accordance with California Environmental Protection Agency <br /> " (CaIEPA) procedures outlined in Representative Sampling of Groundwater for Hazardous Substances <br /> (CaIEPA, 1995). The samples will be submitted to Lancaster Laboratories of Lancaster, Pennsylvania for <br /> analysis. <br /> If you have any questions or comments regarding the contents of this Work Plan, please contact Dav' _ <br /> Lay of BBL at (315) 671-9197 or by email at dlay@bbl-inc.com or David Evans of BBL at (91 ` taiE �(�� <br /> _ 0124 extension 226 or by email at devans@bbl-inc.com. Q� p FL- <br /> Sincerely, <br /> Lc <br /> Sincerel <br /> Y, Lj <br /> z C 35705 'c <br /> BLASLAND, BOUCK & LEE, INC. * EXP -7 1' <br /> x <br /> crvlL <br /> C!� <br /> David W. Lay, C.P.G. Michael P Fleischner, P.E. <br /> _ Senior Geologist Principal Engineer <br /> DWL/plf <br /> Enclosures: <br /> Figure 1 - Site Plan with Proposed Soil Boring Locations <br /> Attachment 1 - Regulatory Correspondence <br /> Attachment 2-Generalized Well Completion Details <br /> cc: Ms. Stephanie Furgal,Chevron Environmental Management Company <br /> Mr. James Barton, Regional Water Quality Control Board, Rancho Cordova, California <br /> Ms. Christine Coronea, Sutter Office Center, San Francisco,California <br /> J:IW06\9-8227_00261022_2006 Work Plan.doc <br /> BLASLAND, BOUCK& LEE, INC. <br /> engineers, scientists,economists <br /> r <br />