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PUBLIC HEALTH SERVICESoP� rk.. <br /> �.•`9"�.coa <br /> SAN JOAQUIN COUNTY y <br /> ENVIRONMENTAL HEALTH DMSION <br /> Karen Furst, M.D., M.P.H., Health Officer ' <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 FILE C <br /> MIKE KARVELOT <br /> QUIK STOP MARKETS INC SEP 15 1998 <br /> P O BOX 5745 <br /> 1! EMONT CA 94537 <br /> RE: QUIK STOP MARKET#121 SITE CODE: 1430 <br /> 1196 W. LOUISE AVE. <br /> MANTECA, CA 95336 <br /> San Joaquin County Public Health Services/Environmental Health Division (PHS/EHD) has <br /> reviewed the"Addendum to Work Plan for Soil and Groundwater Investigation"which was <br /> prepared by Compliance and Closure, Inc. for the above referenced site and has the following <br /> comments for your consideration and action. <br /> As a preliminary investigation the proposed locations of the geoprobe soil borings will be <br /> satisfactory with the following modifications: The boring proposed south of the new tank farm <br /> should be moved to the northwest so that it is located to the east of the new tank farm and closer <br /> to the corner of the former tank pit. The boring proposed in the northeast corner of the property <br /> should be moved south so that it is located within twenty feet of the dispenser island. <br /> The first soil boring will be done within five feet of the location of sample S-5 (collected at the time <br /> of the tank removals). This boring will be done as a continuous core, and needs to be advanced <br /> to depth such that field observations and PID readings indicate that vertical definition may have <br /> been made. Please note that it may be necessary to advance this boring to greater than 30 feet <br /> in depth. The information obtained from this boring will direct the depth to which the subsequent <br /> borings will need to be advanced. In addition, at least one more boring shall be drilled as a <br /> continuous core. This boring needs to be outside of the former tank pit area, PHS/EHD <br /> recommends the boring to the east of the new tank farm. <br /> Groundwater samples will be collected for analysis from each boring at the termination of the <br /> borehole. In addition, soil samples will be collected from each borehole at 5 foot intervals, <br /> beginning at five feet below surface grade(bsg), with the exception of the boring in the former <br /> tank pit where sampling can begin below the backfill. Determination of which soil samples will be <br /> submitted for analysis shall be made after field observations. Please note that it is likely that more <br /> than eight soil samples will need to undergo analysis in order to make a thorough site <br /> characterization. As noted in the work plan all soil and groundwater samples will be analyzed for <br /> total petroleum hydrocarbons as gasoline(TPHg) by method 8015m; benzene, toluene, <br /> ethylbenzene and xylene (BTEX) by method 8020, and oxygenates by method 8260. <br /> The purpose of doing investigative field work is to obtain as much information as possible about <br /> the extent and intensity of the hydrocarbon contamination present at the site. The information <br /> obtained from the geoprobe borings should be able to direct the need for future work, such as the <br /> proper placement of monitoring wells and the determination of the mass of contamination present. <br /> A Division of San Joaquin County Health Care Services <br />