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4 <br /> 1 <br /> (MTBE), and Tert-amyl methyl ether (TAME) greater than the analytical method reporting limit <br /> Analytical results are presented in Table 1 <br /> The constituent n-PropY lbenzene was detected in SC-1-100' at a concentration of 13 µg/l The <br /> constituent tert-Butylbenzene was detected in SC-1-65' at a concentration of 0 6 pg/l and <br /> 1,2,4-Tnmethylbenzene was detected an all groundwater samples at concentrations ranging <br /> between 2 9 and 4 4 pg/l Laboratory analytical reports are included in Appendix C <br /> 1 <br /> 3.4 Contaminant Mass Calculations <br /> At the request of Caltrans, IT estimated the mass of contaminants at the site based on the data <br /> collected from CPT boring SC-1 and plume data provided by Caltrans The CPT data was used <br /> to estimate the depth and thickness of three saturated intervals A planimeter and a map showing <br /> the surface area of the plume (Appendix D) were used to estimate the two dimensional area of <br /> the plume which was found to be 625 square meters The same area was applied to all saturated <br /> rzones A homogenous distribution throughout the plume volume was assumed for mass <br /> calculations <br /> Contaminant mass estimates are presented in Table 2 <br /> The following formula was used to estimate the contaminant amounts <br /> Plume area of 625 m2 x interval thickness in meters = m3 x 1,000 = liters x 25% porosity <br /> estimated plume volume in liters x analytical values in gg/l =contaminant amount in gg x 10-6 _ <br /> 1 contaminant amount in grams x 0 0022 = contaminant amount in pounds <br /> � 7etlywbpylLSACAFPfICOMA40MsacDP120021PRJWJe1B31935277Zaadac 3-2 <br /> 4J4/n7 <br />