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7 <br /> w. <br /> � Phase 1 Ftvdroc ]ou[c/�uccam_�nl <br /> i Moredau3 Court Shelf <br /> D012 Project Na 40.8-145 <br /> r^ Page 8 <br /> Table 4 <br /> Chemical Analysis of Soil Samples Collected <br /> From Soil Borings Drilled on August 8, 1489 <br /> Concentrations in Parts Per Million (ppm) <br /> " <br /> 1Sample <br /> Sample Date <br /> Depth <br /> D Collected feet a Ethyl- Total <br /> — �� 7PH $enzen� Toluene benzene X lanes ddb <br /> W i SB 7 818184 11.5 <0.01 <0.001 0)008 8/8 <0.001 0.002 <br /> B9 26.5 <0.01Z <O.00Z 0.011 <0.0102 x0.002 4.0 <br /> I SH-8 8/8189 16.5 <0.1 <0.001 0.004 <0.001 <0.005 4.0 <br /> 8/8/89 26.5 <0.01 <0.001 <0.001 <0.001 10.001 1.0 <br /> 'Total Pctmlcum Hydrocarbons <br /> - 1 bCoacrntrations in milligrams per kilogram (equivalent to ppm) <br /> i 4.0 CO3N tlSE®^IAbP*RECOMMEFIDh1IONS <br /> t '^' During the tank closurerocas chem <br /> hertical analysis of soil samples PIi5 and TS-2 resealed TPH <br /> a concentrations of 1,130 and 1,030 ppm,.respgctiveIy. In order to evaluate the extent of petroleum <br /> 64 hydrocarbons detected,Delta drilled soil borings SB-7 and SB-8 near these locations. Chemical analysis i <br /> ; . <br /> Of soil samples collected from soil boring SB-7 at depths of 11.5 and 26.5 feet below grade yielded TPH # <br /> concentrations below the detection limit of 0.0I ppm. Chemical analysis of seal samples collected ected from <br /> soil boring S»-8 at depths of 16.5 and 26.5 feet also indicated TPH concentrations below thedetection <br /> 6jlimit of 0.1 ppm.' I <br /> m ,• <br /> ( ' It is Delta's opinion,based on data coliecte:d from the site, that the concentrations of TPH detected in j <br /> soil samples PW and TS-2 are confined to a small <br /> volume <br /> ^ of sail and that the geology of the site(clayey <br /> Soils)rNu'bits the vertical migration of petroleum constituents. It is our opinion that the small <br /> r_ •_-�._ '_of sor7s containing hydrocarbons "does sot present a threat to ground water. Namara <br /> Pmt _ _ <br /> biodegradation through time will decrease the existing concentrations ofpe petrol <br /> . LE leum hydrocarbons detected <br /> - rn the soils daring tom^tank closure>ictrvitie.s- Consequently,Delta is <br /> recommending that no further action <br /> be taken at the site and that a site closure letter be prepared and forwarded to out client. <br /> -.w <br /> . .. - <br /> x. r <br />