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PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> JOGI KHANNA Nt.O..M.P.H. <br /> Health Officer �' P <br /> P.O. Box 2009 0 (1601 East Hazelton Avenue) • Stockton, California 95201 <br /> c'9i:fFoa�• <br /> (209) 468-3400 <br /> F KURT MILLER (C(Opy <br /> SHELL OIL COMPANY <br /> P 0 BOX 5823 JAN 2 9 1992 <br /> CONCORD CA 94524 <br /> RE: Shell Service Station IN REPLY REFER TO SITE CODE: 1906 <br /> 420 W. Kettleman <br /> Lodi, CA <br /> San Joaquin County Public Health Services, Environmental Health <br /> Division (PHS/EHD) has reviewed the "Quarterly Groundwater <br /> Monitoring Report" dated December 2, 1991, and a letter dated <br /> December 9, 1991 prepared by Aegis Environmental, Inc. for the <br /> above site. <br /> The letter states Aegis plans to discontinue analysis for EDB, <br /> EDC, and lead and plans to change the sampling frequency for TPH <br /> as gasoline and BTEX from quarterly to annually. PHS/EHD concurs <br /> with the plan to discontinue sampling for EDC and lead. The <br /> detection limits used when testing for EDB ranged from .0005 to <br /> .01 parts per million (ppm) . The drinking water standard for EDB <br /> is . 00002 ppm. A detection limit of at least drinking water <br /> standards should be used to test for EDB in the next sampling <br /> event. Based on those results we will consider discontinuance of <br /> sampling for EDB. As stated in a letter to Shell dated <br /> December 27, 1991 from PHS/EHD Arco's monitoring well 112 <br /> evidenced benzene and TPH as gasoline in July 1991. Therefore <br /> Shell's monitoring wells one and three should continue to be <br /> sampled quarterly. Shell's monitoring well two is upgradient so <br /> PHS/EHD concurs with annual sampling of this well. <br /> If you have any questions contact Margaret Lagorio, Senior REHS, <br /> of my staff at (209) 468--3449. <br /> Jogi Kh a, M.D. , M.P.H. <br /> Het ficer <br /> urie A. otulla, REHS, Program Manager <br /> nvironmental Health Division <br /> LAC/ML: lb <br /> C. CVRWQCB <br /> C. Aegis Environmental, Inc. <br /> 1050 Melody Lane Suite 160 <br /> Roseville, CA 95678 <br /> A Division of San Joaquin County Health Care Services �� <br />