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y 02/10/2003 11 03 2e9467111 AGE STOCKTON • PAGE 02 <br /> I <br /> HYDROCARBON-IMPACTED SOIL(GASOLINE) - <br /> VOLUME ASSUMPTIONS AND CALCULATIONS <br /> QUICKI-RLEEN CAR WASH <br /> 707 East Yosemite Avmue, Manteca, CA <br /> Volume of Impacted soil <br /> An estimate of the areal extent of impacted soil surrounding the dispenser area is made from samples collected from <br /> samples S-1 through S-9,borings P 1 through p 11 and wells MW i through MW3 <br /> Based on the distance between the impacted borings and wells,a distance of 30 feet is utilized as an`average'radius of <br /> the hydrocarbon plume for the following calculation The vertical distributionof the unpacted soil ranges from surface <br /> grade to approximately 4;Feet bsg 4 feet m height will be used for the following calculations This volume was calculated <br /> from soil sample data <br /> Ve=3r?•h -4 fi(30ft')-4 ft-11,304#t'/27 W/yd' -419 yd' <br /> Converting 419 yd3 to crit' <br /> 419 yd'•7 6455 x 105 cm'/yd' 3 2 x 10$crni <br /> yields approximately 3 2 x 108 cm3 Using 15 g/cm' as the weight of soil, the total weight of contamimatcd soil,is <br /> approximately 4 $x 108 rams �.- <br /> Calculating an average concentration from soil samples collected from depths of 4 feet bsg, a value of 2 2 m00grams <br /> perkilo am as the"average"concentration of total petroleum hydrocarbons quantified as diesel This va ue wi a use °'W F' <br /> ( oror so�c calculated area from surface grade to 4 feet bs ,the 9 x 1 p 3 g x . <br /> Z Z � � <br /> weight of soil-average concentration —1�4 8 x 101 grams (CO000003 5 g of gasoline <br /> = 1,056 g of gasoline <br /> t k 10 <br /> Converting grams of diesel to volume of gasoline(gallons)using density o "5�� r O- � � �f��l <br /> �� <br /> 1,056 g of gasoline—0 75g/cin'= 1,408 cm' <br /> Z <br /> 1,405 cm' •(1 gallon—3,785 cm3) a 0,37 gallons of gasoline 1� jo .qx t® <br /> fi <br /> Note Diesel was only detected in one soil sample at the site in sample S-8 at 4 feet bsg,therefore a mass balance could <br /> not be calculated for diesel <br /> Sincerely, <br /> Advanced GeoEnvi ronmental,Inc. <br /> Brian W Millman <br /> Staff Geologist <br />