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Client Number SIEOICHV08 Consultant Project Number 1-146-02 Facility Number 9-6171 Project ED 663 Pacific Avenue Stockton Work Order Number C3-08-0321 Date Reissued 09-14-93 Table 1 ANALYTICAL RESULTS Volatile Organics in Soil EPA Methods 8020 and Modified 8015a GTEL Sample Number 04 08 10 11 Client Identification MW7 @ 21' MW7 @ 41' MW7 @ 51' MW7 @ 56' Date Sampled 08/18/93 08/18/93 08/18/93 08/18/93 Date Extracted 08/26/93 08/26/93 08/26/93 08/26/93 Date Analyzed 08/27/93 08/27/93 08/27/93 08/27/93 Detection Analyte Limit, mg/kg Concentration, mg/kg Benzene 0 005 <0 005 <0 005 <0 005 <0 005 Toluene 0 006 <0 006 <0 006 <0 006 <0 006 Ethylbenzene 0 005 <0 005 <0 005 <0 005 <0 005 Xylene,total 0 015 <0 015 <0015 <0 015 <0 015 BTEX,total — — -- -- -- TPH as Gasoline 1 <1 <1 <1 <1 Detection Limrt Multiplier 1 1 1 1 Percent solids 853 838 1 813 787 BPB surrogate, % recove 817 772 1 98 3 1 85 0 a Test Methods for Evaluating Solid Waste, SW-846,Third Edition,Revision 0,US EPA November 1986 Modification for TPH as gasoline as per California State Water Resources Board LOFT Manua[procedures Bromofluorobenzene surrogate recovery acceptability limits are 60-140% Note Due to a contamination problem caused by the use of contaminated centrifuge tubes,the laboratory introduced trifluo- romethylbenzene contamination dunng sample extraction for sod samples The average contamination found was 0 006 ug/L Results for toluene are reported corrected for statlstical differences between blanks and samples The reporting limit for toluene has been raised above the level of uncertainty The blank results provided have been similarly adjusted The laboratory Is actively pursuing an altemative type of centrifuge tube and wdI use glass lar,In the mean time to prevent any further contamination GTEL Concord,CA ~`'- C3080321 BXG � r"A. G T E L E R. E N V I R O N M E N T A L LABORATORIES INC