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,I <br /> PUDIC HEALTH SEA ICES N .� <br /> :. <br /> SAN JOAQUIN COUNTY r Z� <br /> N: ■ <br /> JOGI KHANNA M.D..M.P.H. S <br /> Health Officer • �.... Cp <br /> � <br /> P.O. Box 2009 (1601 East Hamiton Avenue) • Stockton,California 95201 ,LiFd(1 <br /> (209) 46&3400 <br /> DAN KIRK C `JI I� <br /> SHELL OIL COMPANY <br /> P O BOX 5278 AUG 19 1993 <br /> CONCORD CA 94520-9998 <br /> RE: Shell Service Station SITE CODE: 1883 <br /> WIC #204-7524-4404 <br /> 3011 W. Benjamin Holt Dr. <br /> Stockton, CA 95219 <br /> San Joaquin County Public Health Services,Environmental Health Division(PHS/EHD)has <br /> reviewed the "Workplan for Additional Limited Subsurface Investigation" dated July 30, <br /> 1993 as submitted by AEGIS and has the following comments. Directives issued by <br /> PHS/EHD to Shell Oil Company in correspondence dated May 8, 1993 required monitoring <br /> wells to be installed around the existing tank pit, piping and areas of known soil <br /> contamination. <br /> As proposed in this AEGIS workplan, only one monitoring well will be installed so the site <br /> specific gradient cannot be determined. Data obtained from the proposed Hydropunch grab <br /> samples may determine the need for other monitoring wells. Please submit an addendum <br /> showing additional locations of monitoring wells in areas of known soil contamination as <br /> detected in soil boring samples taken January 20, 1990. <br /> Along with the addendum due within sixty days (60) of the date of this letter, include an <br /> updated and complete Site Specific Safety Plan (SSSP)which lists responsible persons with <br /> twenty four (24) hour phone numbers, and a map highlighting the route to the nearest <br /> emergency facility. <br /> Analysis for Ethylene dibromide (EDB) in soil and groundwater is deferred at this time. <br /> Total Lead, not soluble Lead analysis, utilizing EPA Method 7420 or 6010 shall be done on <br /> soil samples. Groundwater analysis for soluble Lead utilizing EPA Method 7421 or 6010 <br /> shall be done when monitoring wells are sampled. <br /> Monitoring wells shall be grouted only with neat Portland cement, or Portland cement with <br /> 3-5% bentonite or a bentonite slurry. PHS/EHD recommends that during well construction <br /> and after filter sand placement, the well be surged long enough to ensure sand settlement <br /> prior to placing the two foot (2') thick bentonite seal. <br /> A Diaiaion of San Joaquin CoMty Health pare Scmcft �� <br />