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MAAY-0I-97 1T:01 Fram:I.T. CORPORATION 5102282501 T-820 P-05108 Jab-685
<br /> V
<br /> TACE 2
<br /> Cakolation of Rcsidusl Masi of Wesel in Soil
<br /> Lipton nKmy
<br /> (Farrnierly 'fan Den *rgb Foods Company)
<br /> Stockton, Califrtrnia
<br /> IT Project No. 762543
<br /> Step 1 - Histogram:
<br /> A histogram of concentrations measured at the site was generated (Figure 1). Due to the
<br /> extreme variation of the concentrations, the hiswgmm was gcnoratod for the following
<br /> arbitrary concentration ranges: -!5-100 mg/kg, 101-1,000 mg/kg, 1001.- 5,000 mg/kg: 5001 --
<br /> 10,000 mg/kg, 10,001 - 20,000 mg ft, 20,001 - 30,000 mg/kg, 30,001- >100,000 mglkg.
<br /> The histogram showed a log-normal distribution with an vxU=nt:left sIMW.
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<br /> Step 2 - Feprmnlahve conmtration:
<br /> The objective of this step was to calculate a representative concentration for each of the
<br /> c onc:entmtion ranges established. in Step 1. Due to the log-normal distribution of the data, a
<br /> log transformation was performed for each concentraUan step. This resulted in the calculation
<br /> of "log C." The middle value between each log transformation was thea calculated. This was
<br /> termed "Mid -log C." The antilog of the "Mid - log C" was then calculated to determino the
<br /> "mid C": the mean concentration within the can=tration range in mg/kg. Table 3
<br /> summadus the calculations that were made.
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<br /> Step 3 - Volume Calculation:
<br /> Using a geostatistical software package GSLIB, kriging was performed on the 70 data paints
<br /> (Seetion 2.2), assuming a log normal distributiam of the data, and the volume of sail within
<br /> each coneentmtion rangy; was estimated. Table 4 provides a summary of the volumes
<br /> calculated.-� •" . FRIPM
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<br /> Step 4 - Residual Klass Calcination:
<br /> Following calculation of the representative c'on.centraFaon and the corresponding volume for
<br /> each concentration range, the residual mass of dicsol in the soil was calx elated. The residual
<br /> mass of diesel in the soil was calculated to be 1203 lbs, corresponding to 160 gallons_ This
<br /> resi$ual mass was calculated to be distributed over a 17,034 W volume at the site. Ttze
<br /> residual mass at the sito corresponds to a unit concentration of 0.07 lbslfe, or 0.009
<br /> gallons/fe.
<br /> MZM5-01-97ND5P197-0DD4j11 4
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