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PUBLIC f4EALTH SERV CES i <br /> � r PgUlry <br /> SAN JOAQUIN COUNTY <br /> r. <br /> ENVIRONMENTAL HEALTH DIVISION w . <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Healthy ' <br /> 304 E. Weber Ave., Third Floor • P. O. Box 388 • Stockton, 3$8 °"<iFORN P <br /> 709 U <br /> 209/468-3420Std 2 ��aE; <br /> JOHN MARGOWSKI <br /> WICKLAND OIL COMPANY f <br /> P O BOX 13648 <br /> SACRAMENTO"' CA 95853-4648 <br /> I <br /> RE: Former Regal Station SITE CODE: 1211 <br /> 6425 Pacific Avenue <br /> Stockton CA 95207 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has <br /> completed review of the "Update Status Report #44: April - June 1996" dated July 19, 1996 and <br /> prepared by WEGE. PHS/EHD has the following comments for your consideration. <br /> I <br /> The update report included the results of the June 20, 1996 groundwater sampling event. The <br /> groundwater sample results continue to evidence petroleum hydrocarbon contamination in <br /> monitoring wells: MW2, MW3, MW7, MW8, MW10, and MW12. Please note that monitoring <br /> wells, MW1 - MW10 are screened from 60 to 30 feet and both MW11 and MW12 are screened <br /> from 70 to 50 feet. Since the most recently reported depth to water was from 37.08 to 41.94, <br /> some wells have screened intervals below the current groundwater level. Samples collected from <br /> wells with water above the screened interval may not be representative of conditions at the <br /> capillary fringe/groundwater interface. Also, you should be aware that samples collected from the <br /> other wells may not be as representative as when the screened interval within water was less than <br /> 20 feet. Groundwater sampling from screened intervals of greater than 20 feet may result in diluted <br /> samples, depending on the well's lithological environment. <br /> f <br /> The update report also included the results of vapor extraction operational sampling. The vacuums <br /> applied to the three wells used for vapor extraction appear reduced, possibly because of the <br /> increasing groundwater levels which reduce the screened intervals available for vapor extraction. <br /> PHS/EHD recommends that the remaining hydrocarbons be characterized and if necessary that ; <br /> additional vapor extraction wells be installed. Please submit a work plan to drill and sample soil <br /> borings to evaluate the effectiveness of the vapor extraction system that has been operating. <br /> Previously, you,had indicated that magnesium peroxide socks would be placed into MW12 and that <br /> MW2 may be retrofitted for air sparging. Please provide a status update on these proposals. <br /> If you have any questions or comments, please do not hesitate to contact me at (209) 468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division 4 <br /> Mary Meays, Senior REHS Marg_7� rio, EHS <br /> Site Mitigation Unit Supervisor <br /> I f! <br /> M M\6425 PAC I <br /> c: Elizabeth Thayer, CVRWQCB <br /> c: Wendy ',Cohen, CVRWQCB <br /> c: George"Converse, WEGE j <br /> c: Wilbur Smith, Lincoln Properties <br /> A Division of San Joaquin County Health Care Services <br /> k <br /> I <br /> f � <br />