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PUBLIC HAALTH SERVICE'S ,oa4V. N �o <br /> SAN JOAQUIN COUNTY =. <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 ' " <br /> 209/468-3420 [ �� <br /> KAREN PETRYNA i <br /> EQUILON ENTERPRISES/SHELL OIL CO MAY 2 41999 <br /> PO BOX 6249 <br /> CARSON CA 90749-6249 <br /> RE: Shell Service Station SITE CODE: 1883 <br /> 3011 W.Benjamin Holt Dr. <br /> Stockton,C,4—,95219 . <br /> On May 19, 1999,San Joaquin County Public Health Services, Environmental Health Division (PHS-EHD) <br /> conducted a field inspection at the above noted facility during a groundwater monitoring well sampling event <br /> and noticed conditions that require your attention. <br /> MW-1 has been receiving surface runoff thru a depressed traffic box with an inadequate seal and shows <br /> evidence that this liquid is entering the monitoring well casing and impacting the groundwater. The traffic <br /> box must be raised so that surface runoff will not be allowed to enter through the lid. <br /> In addition,the locking waterproof casing cap has been leaking and has not been placed on the casing tight <br /> enough in the past. There is no grout in the traffic box. There is dirt inside the traffic box that extends <br /> above the top of the casing. Therefore any liquids entering the traffic box are channeled directly to the well <br /> head. Liquids that enter the traffic box are penetrating past the cap and staining the casing as they migrate <br /> downward to the groundwater. The dirt in the traffic box is to be removed and replaced with a cement grout. <br /> The grout should be no less than half way up inside the traffic box and the top of the monitoring well casing <br /> should be several inches above the grout. <br /> Please take immediate steps to ensure that all monitoring wells at all Shell stations in San Joaquin County are <br /> finished in this manner. The contractor that conducts the monitoring well sampling for these sites should <br /> note the condition of all monitoring wells they encounter and report to you the wells that need repair or <br /> modification. <br /> You may contact Michael Infuma at (209) 468-3454 should you have any questions. <br /> Donna Heran,RENS,Director <br /> Environmental Health Division <br /> Michael J. Infuma Jr., Senior REHS Margam,REHS <br /> LOP/ Site Mitigation Unit IV Supervisor <br /> MY <br /> c: Blaine Tech Services—Ann Pember, 1680 Rogers Ave.,San Jose,95112 <br /> c: Cambria—Diane Lundquist,270 Perkins St., Sonoma,95476 <br /> A Division of San Joaquin Countv Health Care Services <br />