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` ''FIWIRONM ENTAL - K AL i h <br /> MANAGEMENT <br /> I N C 2 ' 25 <br /> 25 <br /> August 16, 1995 <br /> Ms. Mary F. Meays, R.E.H.S. <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 445 N. San Joaquin Street <br /> P.O. Box 388 <br /> Stockton, California 95201-0388 <br /> SUBJECT: Addenda to Analytical Summary Tank Excavation <br /> Federal Building (Stockton) <br /> 401 North San Joaquin <br /> Stockton, California, 95201 <br /> Site Code: 505260 <br /> Dear Ms. Meays: <br /> On behalf of the General Service Administration, Cape Environmental Management, Inc. (CEMI)has <br /> prepared this addenda to the previously submitted review of environmental laboratory data for soil <br /> samples collected from the tank excavation at the subject site dated July 14, 1995. <br /> CEMI had requested additional soil sampling and laboratory testing to facilitate characterization of <br /> impacted soil from the UST excavation at the subject site. On July 6, 1995 a soil sample, N. Wall 14', <br /> was obtained from the side-wall of the excavation, at approximately 14-feet deep in the north-east <br /> portion of excavation (adjacent to the former Tank B location), from a location exhibiting staining <br /> and odor characteristic of fuel oil. This soil sample was submitted for laboratory analyses utilizing <br /> EPA Test Method 8240 for volatile organics, EPA Test Method 8080 for polychlorinated biphenyls <br /> (PCBs), EPA Test Method 8100/8310 for polynuclear aromatic hydrocarbons (FNAs), and EPA Test <br /> Method 6010/7000 Series for Title 26 metals. In addition, soil sample T2-6-21' (below the former <br /> Tank B location) was analyzed for Title 26 metals. Analytical results for the organic analyses <br /> performed on the N. Wall 14' sample are presented in attached Table 1 and Table 2. Results of the <br /> Title 26 metals analyses for both samples are presented in the attached Table 3. A copy of the <br /> analytical laboratory reports provided to CEMI is attached. <br /> No PCB compounds were detected in sample N. Wall 14'above the laboratory detection limit for the <br /> 8080 Method. Also, no volatile organic hydrocarbons were detected in the samples above the <br /> detection limit for the 8240 Method. <br /> Elevated concentrations of TPHg, TPHd, TPHo and the PNAs detected in sample N. Wall 14' (see <br /> Table 1 and Table 2)are probably associated with the fuel oil which appears to have leaked from the <br /> UST. <br /> shared\env\gsa\2403.20\stocktn2.ltr <br /> 20280 South Vermont Avenue <br /> S u i t o 2 5 0 <br /> Torrance, California 90502 <br /> 3 1 0 5 3 2 • 4 5 0 0 <br /> F A X 5 3 2 • 6 0 2 2 <br />