Laserfiche WebLink
Remediation Report - 152 East l Ith Street, Tracy, California Page 13 <br /> To obtain samples for analysis, intact blocks of soil were excavated from the target <br /> locations and raising to the surface in the excavator bucket A face of the block of soil in <br /> the bucket was cut with a knife to expose an undisturbed surface and a clean, 2 in <br /> diameter by 6 in long, brass, sampling tube was driven into the cut soil face until the tube <br /> was completely filled with soil <br /> tube was cleaned externally,Following sample recovery, each sampley, its ends covered <br /> with aluminum foil and it was closed with tightly fitting plastic caps The caps were be <br /> secured with adhesiveless tape Each sample tube was then labeled for identification, <br /> entered into chain-of-custody control and packed on chemical ice for transport to <br /> Chromalab Inc 's laboratory in Pleasanton, California <br /> Each soil sample submitted to the laboratory was analyzed for the following suite of <br /> analytes <br /> Analyte Method of Analysis <br /> Total Petroleum Hydrocarbons EPA Method 5030/8015 <br /> (as Gasoline) <br /> Benzene EPA Method 8020 <br /> Toluene EPA Method 8020 <br /> 1 <br /> Ethyl Benzene EPA Method 8020 <br /> Total Xylene Isomers EPA Method 8020 <br /> Chromalab's laboratory is licenced by the CEPA to perform the listed analyses <br /> CONCENTRATIONS AND DISTRIBUTION OF CONTAMINANTS IN SOIL <br /> A total of 28 soil samples were recovered from the walls and floor of the remedial <br /> excavation The sampling locations are shown on Figures 5 and 6 and the depths from <br /> which they were recovered are noted in Table 1 Table I also lists the concentrations of <br /> total petroleum hydrocarbons (quantified as gasoline) benzene, toluene, ethylbenzene and <br /> total xylene isomers detected in the samples The certificates of analysis issued by the <br /> laboratory and the associated chain-of-custody documentation are presented in Appendix <br /> C <br /> The data in Table I show that the remedial excavation was successful in removing <br /> essentially all contaminated soil from beneath the 152 East 11th Street property, except <br /> for low concentrations of hydrocarbons at depths greater than 13 feet beneath the ground <br /> surface in isolated locations along the north frontage of the property The distributions of <br /> fuel hydrocarbons in the walls of the excavation along the north, east and west boundaries <br />