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i <br /> ITPH-d IMPACTED SOIL. <br /> . VOLUME ASSUMPTIONS AND CALCULATIONS <br /> Proposed El Dorado Apartments <br /> 2450 South El Dorado Street, Stockton, California <br /> Assumptions. <br /> Based on weight tags provided by Forward Landfill,the volume of TPH-d-tmpacted soil removed from the site during <br /> the UST removal can be approximated as follows <br /> Approximate mass of TPH-d-impacted soil removed during tank removal=372 tons <br /> Approximate mass of one cubic yard(yd)of soil is approximately 125 tons/yd' -►372 tons/(1 5 tons/yd) = <br /> I 294 yd <br />' Based on Figures 2,5 and 6 and the volume of soil excavated during the UST removal,the volume of TPH-d-unpacted <br /> soil at the site can be approximated as follows <br /> Volume of remaining TPH-d-impacted soil <br />' Volume A TPH-d-impacted soil with concentrations greater than 1,000 milligrams per kilogram(mg/kg) <br />' Lateral extent of remaining impacted soil = 910 ft' <br /> Average thickness of remaining impacted soil = 15 feet_ <br /> Approximate volume of impacted soil= 1,365 fl'=51 yd3 <br /> lie <br /> Volume B TPH-d-impacted soil with concentrations less than 1,000 mg/kg <br /> Lateral extent of remaining impacted soil z 8,970 if <br />' Avera e thickness of remaining imT3acted soil = 15 feet <br /> Approximate volume of impacted soil= 134,550 ft =5,000 yd'-51 yd'(Volume A)-297 yd (UST <br /> removal) = 4,652 yd' <br />' Based on weight tags provided by Forward Landfill,the volume of TPH-d-Impacted soil removed from the site during <br /> the UST removal can be approximated as follows <br />' Approximate mass of TPH-d-i npacted soil removed during tank removal=372 tons <br /> Approximate mass of one cubic yard(yd )of soil is approximately 1 25 tons/yd' -i 372 tons/(1 5 tons/yd) r <br />' 294 yd' <br /> Calculations <br /> tThe average TPH-d concentration was estimated by averaging the TPH-d concentrations detected in analyzed soil <br /> samples collected from near the former UST area The following soil samples and respective concentrations were used <br />' Volume A <br /> Average of UST floor samples -5,620 milligram per kilogram(mg/kg) <br /> (Sample UST 1-001 was not included in the average concentration, sample UST 1-001 was collected <br />' in a shallow sand zone between the bottom of UST-1 and the concrete foundation supporting UST-1 <br /> and UST-2 and is not representative of impacted soil beneath the UST area) <br />' Advanced GcoEnvtronmental,Inc <br /> 1 <br />