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PUBLIC HEALTH SERAICES o <br /> 4� <br /> SAN JOAQUIN COUNTY <br /> JOG]KHANNA M.D.,M.P.H. <br /> Health Officer <br /> P.O. Box 2009 0 (1601 East Hazelton Avenue) • Stockton, California 95201 �4�+Foa�'�P <br /> (209)468-3400 <br /> BUD GOOD <br /> SOUTHLAND CORPORATION <br /> 5820 STONERIDGE MALL ROAD <br /> SUITE 310 JUL 0 6 1992 <br /> PLEASANTON CA 94588 <br /> Re: 7-Eleven Store #2243-20304 SITE CODE: 1409 <br /> 455 West Grant Line Road <br /> Tracy CA 94588 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) conducted a site <br /> inspection on June 19, 1992 to witness groundwater sampling. PHS/EHD has the following comments for <br /> your consideration. <br /> PHS/EHD observed significant surface drainage into the traffic boxes of monitoring wells, MW-8, MW-9, <br /> and MW-10. These traffic boxes are below grade and hence subject to surface drainage. Organic liquid <br /> collects in the traffic boxes. Furthermore, evidence is present which suggests that drainage has occurred <br /> into the casing of MW-8. Frequent replacement of the expandable water tight locldng caps will be <br /> necessary to insure that wells are not subject to surface contamination. Immediately replace the traffic box <br /> gaskets, to decrease surface drainage into traffic boxes,by July 24, 1992. Also, consider the replacement <br /> of MW-8, MW-9, and MW-10 traffic boxes to prevent surface drainage. <br /> Prior to the sampling of monitoring wells,pH,electrical conductivity, and temperature parameters were <br /> not measured to verify groundwater stabilization. The "Leaking Underground Fuel Tank" (LUFT) manual <br /> prepared by the California State Water Resources Control Board states that purging of monitoring wells <br /> should continue, prior to sampling, until pH,electrical conductivity and temperature parameters have <br /> stabilized. Furthermore the "LUFT" manual recognizes that the amount purged will usually exceed four <br /> well volumes. Please be prepared to measure pH, conductivity and temperature parameters during <br /> monitoring well purging prior to any future monitoring well sampling. <br /> If you have any questions, please contact Mary Meays, RENS,of my staff at (209) 468-0337. <br /> Jogi Khanna, ., M.P.H. <br /> Health O <br /> 7 <br /> rie to a, S, Program anage <br /> nvironmental Health Division <br /> LAC/MM:ib <br /> c: Elizabeth Thayer, CVRWQCB <br /> c: Al Ellis, Rishwain, Hakeem and Ellis <br /> c: Sven Edlund, Harding Lawson Associates <br /> c: Scott Thompson, Alton Geoscience <br /> A Division of San Joaquin Counry Heakh Care Services 10 <br />