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Volume and Mass Calculation of Dissolved TPH-g Elkhorn Country Club -_� 1050 Elkhorn Drive, Stockton, California Assumptions: • The distribution of dissolved TPH-g concentrations on the site can be approximated by a cylinder with an average concentration of TPH-g; • The effective porosity of soil at the site is 35% (probably overestimated); and • Data collected from the Apnl 2001 ground water sampling event are representative of existing site conditions, _a The area of a cylinder can be calculated by the formula: Vc=rcrZh, where r is the radius of the cylinder and h is the height(equivalent to saturated zone within screened interval of the well). For the estimated cylinder,r= 15 ft,h= 10 ft - J The TPH-g concentration for the cylinder of ground water is estimated to be 570 micrograms per liter. This concentration is equivalent to 0.00057 g/l. I The area of the cylinder is given by: Vc —rcrzh -a 15 ft)' 10 ft =7,068 ft' Water occupies the porosity in the soil, which is estimated to be 35% of the soil volume, so the total volume of water in the saturated portion of the cylinder is approximated by: Vw=(0.35)(7,068 ft)=2,474 ft' 1 One cubic foot of water contains 7.48 gallons, so the volume of the water in the cylinder is given by: ( i Vw=(2,474 ft3)(7.48 gal/ft3) = 18,500 gallons One gallon of water equals 3.785 liter of water, so the volume of the water expressed as liters in the cylinder is given by: V= (18,500 gallons) (3.785 liter/gallon) =70,040 liter of water Volume to Mass Calculation of Dissolved TPH-g Multiplying the volume of water as liters by the TPH-g concentration(570 Mg/1)yields the approximate mass of TPH-g remaining at the site. MTP,-�=(70,040 liter of water) (0.00057 gll) =39.9 granas TPH-g or O.0.399 kg TPH-g Advanced GeoEnvironmenW,Inc.