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COMPUTATION SHEET <br /> JECT TITLE ARCO Service Station 6100 PROJECT NO 20805-152 008 <br /> CRIPTION Mass of Petroleum Hydrocarbons in Soil SHEET 4 OF <br /> PREP BY MC DATE Jul 17 98 CHKD BY DATE <br /> These calculations present the total mass of total BTEX in soil The data set contains <br /> analytical results for UST cavity and piping trench soil samples and exploratory boring soil samples <br /> lsoconcentration plots of the analytical data were prepared for depths of 10 to 25 feet bgs, <br /> 26 to 45 feet bgs, 46 to 65 feet bgs, 66 to 85 feet bgs, and 85 to 115 feet bgs <br /> The area enclosed by the respective fsoconcentration lines was determined using a planimeter <br /> Sod types encountered during drilling include fine grained sand (SP) silty sand (SM), slit (ML), and clay (CL) <br /> An average bulk density value for the soil types encountered of 110 pcf was used in the calculations <br /> Assumptions concentrations within isoconcentration line are assumed constant <br /> the average of detected concentrations within the interval was used <br /> the concentration does not vary with lisp#h <br /> Planimeter Data <br /> Depth Interval Contour Line Area (ft2) Volume (ft3) Corr Vol (ft3) <br /> BTEX - 10 to 25 ft 1000 100 1500 <br /> 100 1607 24105 22605 <br /> 10 5226 78390 54285 <br /> 1 8810 132150 53760 <br /> BTEX - 26 to 45 ft 1000 2368 47360 <br /> 100 4762 95240 47880 <br /> 10 7777 155540 60300 <br /> 1 10507 210140 54600 <br /> BTEX - 46 to 65 ft 1000 680 13600 <br /> 100 2420 48400 34800 <br /> 10 6050 121000 72600 <br /> 7 11800 236000 115000 <br /> BTEX - 66 to 85 ft 100 526 10520 <br /> 10 980 19600 9080 <br /> 1 1650 33000 13400 <br /> quation Mass of hydrocarbon = volume of soil X soil density X pounds hydrocarbon/pound of soil <br /> corrected volume subtracts the area enclosed within the 100 ppm contour from the <br /> are enclosed within the 10 ppm contour, etc , to prevent estimating the mass twice <br /> Hjexceldat/arco/6100calc As <br />