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i <br /> TPH-d INTACTED SOIL <br /> VOLUME ASSUMPTIONS AND CALCULATIONS <br /> Proposed E1 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-impacted 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/yd3 i 372 tons/(I 5 tons/yd3) _ <br /> 294 yd3 <br /> i <br /> Based an Figures 2,5 and 6 and the volume of soil excavated during the UST removal,the volume ofTPH-d-uripacted <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 /> 4 <br /> ' Lateral extent of remaining impacted soil= 910 ft' <br /> Average thickness of remaining impacted soil = 1 5 feet <br /> Approxiinate volume of impacted soil= 1,365 ft'=51 yd3 <br /> ' Volume B TPH-d-umacted soil with concentrations less than 1,000 mg/kg <br /> Lateral extent of reinaming impacted soil= 8,970 fF <br /> ,Average thickness of remaining im acted soil =:15 feet <br /> Approximate volume of impacted soil=134,550 f13=5,000 yd'-51 yd'(Volume A)-297 yd- (UST <br /> removal) = 4,652 yd' <br /> 1 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-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/y&) _ <br /> 294 yd3 <br /> 1 <br /> Calculations <br /> ' The 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 USTi-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-4 and the concrete foundation supporting UST-1 <br /> and UST-2 and is not representative of impacted soil beneath the UST.area) <br /> 1 Advanced GeoEnvlropmental,Inc <br /> 1 <br />