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' 7.2 Analysis Methodology - Solidified grout samples from MW-3, 5, and 6 were <br /> selected for chemical analysis since the grout from these wells would be <br /> ' representative of each of the three different grout mixes used on this project. <br /> The grout samples submitted to Chromalab were tested by performing a <br /> Toxicity Characteristic Leaching Procedure (TCLP) extraction and analyzing <br /> ' for Total Petroleum Hydrocarbons-Diesel(EPA test method 3510/8015). The <br /> duplicate grout samples shipped to Halliburton were analyzed for total oil and <br /> grease content by EPA test method 413.1. <br /> ' The black colored residue sample collected on June 2 consisted of a solid and <br /> liquid media. Each medium was separated by filtration and treated as two <br /> ' samples in Halliburton's laboratory. The liquid medium was analyzed directly <br /> by Inductively Coupled Plasma Atomic Emission Spectroscopy (ICP-AES) for <br /> a suite of ten elements. The solids were dried, a subsample digested in a <br /> ' nitric/hydrofluoric acid mixture, and then analyzed by ICP-AES. <br /> 7.3 Chemical Results -The results of the analysis performed on the grout samples <br /> ' by TCLP/TPH-Diesel are reported in Table 7-1, Chemical Analysis-Grout <br /> Mixes and in the Chromalab Report (File No. 0692120 dated June 19, 1992 <br /> attached under Appendix Q. The results of the analyses performed by the <br /> ' Halliburton laboratory are presented in the Halliburton Project Report C06- <br /> P002-92 Supplement #1 dated June 25, 1992 attached under Appendix C. <br /> ' Table 7-1 <br /> Chemical Analysis - Grout Mixes <br /> 1 <br /> Sample ID 'TCLP - Diesel Detection Limit Type of Grout Mix <br /> ' (AglL) Gg/L) <br /> MW-3 N.D." 50 50:50 portland cement <br /> ' and pozzolan <br /> MW-5 N.D. 50 Equal portions of cement <br /> t and pozzolan with 2% gel <br /> MW-6 N.D. 50 96% portland cement and <br /> 4% gel <br /> ' N.D. - Not detected at or above detection limit. <br /> ' The extractable TPH (diesel, kerosene, motor oil) performed on <br /> representative grout samples collected from within the well casings at a three- <br /> foot depth are below the 50 µg/L (ppb) detection limit; therefore, it appears <br /> that the levels of kerosene and motor oil detected in the mix water supply <br /> (pump truck and on-site water supply)by analysis had been successfully bound <br /> ' within the solidified grout matrix. <br /> 15 <br /> ' &Associates <br />