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La <br /> GEOMATRIX <br /> 16- TABLE 4 <br /> PREVIOUS ASSESSMENT GRAB GROUNDWATER ANALYTICAL DATA' <br /> UST Site No. 3 - Port of Stockton <br /> Stockton, California <br /> BTEX3 <br /> Sample Number Date TPHg2 �-B T E X <br /> La B34 @ 20 feet 12/20/01 <50' <0.5 <0.5 <0.5 <0.5 <br /> B3-4 40 feet 12/20/01 <50 <0.5 <0.5 <0.5 <0.5 <br /> B3-5 @ 20 feet 12/20/01 610,000 19,000 21,000 12,000 39,000 <br /> LO B3-5 @ 40 feet 12/20/01 220 10 2.1 2.6 8.4 <br /> B3-6 @ 20 feet 12/21/01 6,900 2,200 26 62 58 <br /> 133-6 @ 40 feet 12/21/01 <50 <0.5 <0.5 <0.5 <0.5 <br /> L. B3-7 @ 20 feet 12/21/01 <50 <0.5 <0.5 <0.5 <0.5 <br /> 133-7 @ 40 feet 12/21/01 <50 <0.5 <0.5 <0.5 <0.5 <br /> B3-8 @ 20 feet 02/27/02 <50 <0.5 <0.5 <0.5 <0.5 <br /> �. 133-9 @ 20 feet 02/27/02 <50 <0.5 <0.5 <0.5 <0.5 <br /> B3-9 @ 40 feet 02/27/02 <50 <0.5 <0.5 <0.5 <0.5 <br /> B3-10 @ 20 feet 02/27/02 <50 <0.5 <0.5 <0.5 <0.5 <br /> v <br /> B3-11 @ 20 feet 02/28/02 <50 <0.5 <0.5 <0.5 <0.5 <br /> B3-11 40 feet 02/28/02 <50 <0.5 <0.5 <0.5 <0.5 <br /> B3-12 @ 20 feet 02/28/02 <50 <0.5 <0.5 <0.5 <0.5 <br /> y B3-13 @ 20 feet 02/28/02 <50 <0.5 <0.5 <0.5 <0.5 <br /> B3-13 @ 40 feet 02/28/02 <50 <0.5 <0.5 <0.5 <0.5 <br /> B3-14 @ 40 feet' 01/28/03 <20 <0.5 <0.5 <0.5 <0.5 <br /> 1.0 1. Groundwater analytical data for soil borings from previous assessments: <br /> Geomatrix Consultants,Inc.,2002,Results of Assessment and Recommendations for Well Placement,UST Site No.3 <br /> (Site Code 1282-124),prepared for the Port of Stockton. <br /> LN Geomatrix Consultants,Inc.,2002,Results of Assessment and Recommendations for Further Assessment Lateral and <br /> Vertical Extent of Petroleum Hydrocarbons in Soil and Groundwater,Site No.3(Site Code 1282-124),prepared for <br /> the Port of Stockton. <br /> ., Geomatrix Consultants,Inc.,2003,Results of Additional Assessment and Remediation Evaluation of Petroleum <br /> Hydrocarbons in Groundwater,UST Site No.3(Site Code 1282-124),prepared for the Port of Stockton. <br /> 2. TPHg=total petroleum hydrocarbons quantified as gasoline analyzed using U.S.Environmental Protection Agency <br /> (EPA)Method 8015M or 8260B. Results reported in micrograms per liter(µg/L). <br /> 3. B=benzene,T=toluene,E=ethylbenzene,X=total xylenes(sum of m,p-xylene and o-xylene), <br /> using Environmental Protection Agency(EPA)Method 8020 or 8260B. Results reported in Ag/L. <br /> 4. <=Analyte not detected at concentration greater than the reporting limit shown. <br /> Le 5. Sample 133-14 at 40 feet had a diisopropyl ether detection of 0.88µg/L,with a practical quantitation limit of 0.5 pg/L. <br /> Ir <br /> I:TROJEC R6000s16437.00016437-24 <br /> i.r <br />