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I . <br />' Table 3 —Dissolved Phase Zone Areas, Volumes and Ave. TPH-G Concentrations <br /> I Zone Contour Ave. Gross Area Net Area Vol Of Slice <br /> Interval Cone (30'-45') <br /> (ppb) <br />' 1 10-100 ppb 27 29,395 s f 11,535 s f 173,025 c f <br /> 2 100-1K ppb 270 17,860 s f 6,760 s f 101,400 c f <br /> 3 1K-10K ppb 2,700 11,100 s f 5,490 s f 82,325 c f <br /> 4 1OK-100K ppb 27 K 5,610 s f 4,460 s f 66,900 c f <br /> 1 5 >100K ppb 130K 1,150 s f 1,150 s f 17,250 c f <br /> In calculating contaminant mass, the zone volumes are multiplied by the average contaminant <br />' concentrations, taking into account the average soil porosity, which is assumed to be 35 <br /> percent The table below summarizes these calculations <br />' Table 4- Calculation of Dissolved TPH-G Contaminant Mass <br /> Zone Contaminant Zone Vol Water Mass Contaminant Mass <br />' Cone (C) (V) = 62« ).V (= Water Mass.C) <br /> 1 27 ppb 173,025 c f 3,754,642 lbs 0 1 lbs <br /> 2 270 2pb 101,400 c f 2,200,380 lbs 0 6 lbs <br /> 3 2,700 ppb 82,325 c f 1,786,452 lbs 4 8 lbs <br /> 4 27K ppb 66,900 c f 1,451,730 lbs 39 lbs <br /> 5 115K ppb 17,250 c f 374,325 lbs 43 lbs <br /> TOTAL 88 lbs <br />' To summarize, the estimated contaminant mass in the sub-surface is, <br />' . Vadose Zone - Bound Phase—2,510 lbs <br /> • Saturated Zone - Bound Phase— 11,195 lbs <br /> • Dissolved Phase - 88 <br />' Using and specific density for the contaminant of 0 9, the contaminant mass estimates <br /> translate volumetrically to slightly under 3,000 gallons in the adsorbed phase of the saturated <br />' zone, and about 62 gallons in the dissolved phase <br /> 1 <br /> i <br />' 2937 Veneman Ave,##B240 Geo-Phase Environmental Inc Phone(209)569-0293 <br /> Modesto,CA 95356 Fax(209) 569-0295 <br />