ARCHIVED REPORTS_XR0007963 - Laserfiche WebLink

Home Browse Search

Department of Health Services (DOHS) certified hazardous waste testing laboratory (Certificate #257) . All soil samples were tested for TPH and total lead. The two soil samples from each boring with the highest and lowest TPH concentrations were tested for volatile organic compounds (VOCs) using EPA method I 8240, except for sample B-9 @ 30 ' which was tested only for BTXE. Alternatively, if no TPH were detected in soil samples collected from a given boring, then the two samples obtained from that boring at 5 and 10 feet bgs were tested for VOCs. Only the sample with the highest TPH concentration was tested for total recoverable petroleum hydrocarbons (TRPH) using EPA Method 4181. The soil sample with the highest total lead ' concentration was tested for soluble lead. The laboratory was also instructed to report the carbon chain breakdown for hydrocarbons detected in soil samples B-7 @ 5 ' and B-9 @ 201 . ' Furthermore, one soil sample (B-9 @ 301 ) was delivered to B C Analytical for the purpose of performing simulated distillation and gas chromatography by EPA Methods 8015 and 8020 to attempt to finger print the contaminants. ' The carbon chain analyses indicate concentrations of different hydrocarbons with different chain lengths ranging from C7 (light) through C24 (heavy) . This range does not necessarily include all carbon chains which may be present in the samples, but provides an indication of the predominant carbon chain lengths present. The simulated distillation results provided the same type of information as carbon chain analyses, except that the lightest hydrocarbon is CS and the heaviest is C43 . Gasoline contains hydrocarbon compounds, the majority of which ' range from C4 to C10 with a maximum near C5 . There are compounds that fall outside this range; however, their contribution to the total mass of material is small. Gasoline has high levels of benzene, toluene, ethylbenzene and xylenes. These compounds have high octane ratings. The remaining compounds are generally straight chain and branched chain ' alkanes, most of which have low octane ratings. The results of the testing are shown on Tables 1 through 3 , and the laboratory reports are contained in Appendix C. ' 5. 2 QUALITY CONTROL SAMPLE An equipment blank associated with soil sampling activities was prepared by filling two 40-m1 VOA vials (labeled as MW-2) with the distilled water used to rinse the sampling equipment after it had been washed following the procedures described in Section 2 . 3 . The equipment blank then was analytically tested for TPH. No TPH were detected in the water sample (see Appendix C) . Project No. 1232 -6- ENVIRONMENTAL AUDIT,INC®