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SERVICESPUBLIC Hiv�ALTH �au,H <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION . ± <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 4 P' <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 2091468-3420 <br /> t <br /> GREG CARNEY <br /> STOCKTON TERMINAL EASTERN RR JUL 06 1999 <br /> 4 <br /> 1330 N BROADWAY <br /> STOCKTON CA 95205 <br /> RE: Stockton Terminal & Eastern 'RR SITE CODE: 1726 <br /> 1282 Shaw Road <br /> Stockton CA 95215 <br />� San JoaquinY Count Public Health Services, Environmental Health Division (PHSJEHD) , <br /> has reviewed the "Site Contamination Work Plan" that was prepared by Upgradient <br /> Environmental Consultants for the above referenced site and received by PHSIEHD on <br /> June 30, 1999, and has the following comments. <br /> In November 1998, one 10,000-gallon underground,storage tank (UST) was removed <br /> from the site. Five soil samples collected from the bottom of the tank pit excavation and <br /> F the stockpiled soil were analyzed for total petroleum hydrocarbons as diesel (TPHd), for <br /> benzene, toluene, ethylbenzene and xylene (BTEX), and for methyl tertiary butyl ether <br />'F (MTBE). Results of the analysis reported TPHd in all samples. Benzene was not <br /> reported in any samples, but the.method detection limits used for the BTEX analysis <br /> from tank sample T-W.1 (145) and stockpile samples SP-1A.1,1A.2 and SP-2.1 were <br /> E raised above acceptable limits. The acceptable detection limit for BTEX in soil is -005 <br /> mg/kg. In addition, the method detection limits used for the MTBE analysis of all <br /> samples were also raised above acceptable limits- The maximum acceptable detection <br /> limit for MTBE in soil is .010 mg/kg. <br /> The work plan proposes to begin the assessment of the petroleum hydrocarbon <br /> contamination evidenced at this site with one soil boring to depth in the middle of the <br /> former tank pit area, and three soil borings to surround the area. Soil borings will be <br /> advanced by hollow stem auger, with samples collected every five-feet. Collection of <br /> soil samples from the boring located in the former tank pit will begin at 20-feet below <br /> surface grade (bsg). Soil borings will be advanced to depth until two consecutive <br /> samples appear to be free of contamination as noted by sensory observation and field <br /> screening with a PID or organic vapor meter. Should groundwater be encountered <br /> during the drilling, at least three of the borings will be converted to groundwater <br /> monitoring wells. Please note that backfilling of the borehaies maybe necessary.prior to <br /> setting the wells, in order to set them at the proper depth to encounter first groundwater. <br /> Description of the construction of the proposed monitoring wells is not given in the work <br /> plan, except to say that they will be completed with 2-inch diameter casings that will <br /> extend to 15-feet below the groundwater interface. Reference is made to a well design <br /> as shown in Figure 4, but no Figure 4 was included in the work plan. <br /> Division of San Joaquin Count-,-Health Care Services <br />