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CALCULATION OF GALLONS Of CONTAMINATION IN SPECIFIED VOLUME OF SOIL <br /> CLIENT The Southland Corporation <br /> SITE 9110i'horntond SlocktoyCA <br /> DATE 10109,RJ5 <br /> G"UlA14-A'(Wro YM) <br /> Estimated current mass of adsorbed petroleum hydrocarbons based on soil analytical results and PID readings. <br /> Reference Figure for delineation of areas around boring K,trench sample 2,and boring P, The following assumptions were used: <br /> Don K IrenclL2 <br /> TPH'-G not detected{<1.0 mgAg),but BTEX was detected 2100 mg/kg TPH-G delaided in Trench 2 sample. Based on historical and current analykal results and PID readings from borings <br /> (may concentratron 0 055 mg/kg) Estimated TPH-G TPH-G c I mWkg in Trench 1 sample, Definlion A,G,J.O,and P and from monitoring wells MW-1,MW-4,MW-17a,and MW-20,the <br /> concentration at 0 2 mgAg from 25 to 401ee extending outward around trench sample provided by confirmation following residual TPH-G concentrations were estimated for given depths and <br /> in a 10 toot radius(314 h'2 area). Definition around borings F,G,J,and M(January-February 1993, distances from boring P. <br /> boring K provided by confirmation borings E.F.L.and M August 1995) Based on analytical results and PID cortc,ntrafions In m r <br /> (January 1993,August 1995)and tank pit excavation readings assumed 2100 mg/kg to 0.5 feet below trench to cos om �onng <br /> samples(September 19911, and 500 mg/kg from 0.5 to 1.0 feet below trench. Depth(11) 0-3 3.7 7-12 <br /> ___.. Assumed impacted area is 15led long and 3 fee wide. '18-20 - <br /> �- - <br /> 20.23 2600 260 26 <br /> 23-25 500 50 5 <br /> 25.30 100 10 1 <br /> 35-37 100 to t <br /> Boring Tranch Trench Boring Boring Boring Baring Boring Boring Baring Boring Boring Baring Baring. Baring Boring Boring Boring Boring <br /> K 2 2 P P P P P P P P P P P P P P P P <br /> CONTAMINANT TPHG TPH-G TPH.G TPH-G TPH-G TPH-G TPH-G TPH-G TPH-0 TPH-G TPH-G TPH-G TPH-G TPH-G TPH-0 TPH-G TPH-G TPH-G TPH-0 <br /> X-CONTAMiNANT CONCENIRATK)N(ppm/ = 02 2100 S00 500 2600 506 100 1 too 50 260 50 10 10 5 26 5 1 1 <br /> D.-.AVERAGE SOIL DENSITY(IbsW.31) ,= 129 129 129 129_ 129 _124_ 129 129 129 129- _ 129. 129.. 129. 129. 129-. -129 129 129 129 <br /> M•MASS OF 1 GALLON OF CONTAMINANT(lbs) 65 6,5 6.5 6.5 65 6.5 6.5 6.5 6.5 6.5 6.5 8.5 6-5 65 6.5 6,5 6.5 6,5 6.5 <br /> A•IMPACTED AREA(fr'21 = 31430 30 28.26 28.26 28.26 28.26 28.26 28-26 ' 125-6 125.6 125.8 125.6 125.6 270 270 270 270 270 <br /> H-HEIGHT OF IMPACTED AREA(A) = 15 0,5 05 2 3 2 5 5 2 2 3 2 5 2 2 3 2 5 2 <br /> RESIDUAL <br /> TPH-0 <br /> G•GALLONS OF CONTAMINANT = 0.02 0.63 0.15 0.56 4.37 0.56 0.28_ 0.00 0.11 0.25 1.94 0.25 0.12 0.05 0.05 0.42 0.05 0.03 0.01 9.86 <br /> ❑© GROUNDWATER <br /> 000 TECHNOLOGY <br />