Final Remedial Action Completion Report for the ... - Rvaap.org

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Cmt.# Page # Line # New Page or Sheet Comment Shaw Environmental, Inc. 5 of 39 Recommendation Response range recoveries (as long as the recovery is over 10%). Although a number of surrogate recoveries were outside the allowable range (as shown in Table 2-4) for method blanks and LCSs, no qualification was assigned. The following sample results will be assigned UJ based on surrogate recovery (one or more outside the allowable range of 50- 150%). (d) PCBs: LCG does not address sample qualification criteria (or the corrective action) on the samples, when associated method blank and LCS yields out of range recoveries (as long as the recovery is over 10%). Although a number of surrogate recoveries were outside the allowable range (as shown in Table 2-5) for method blanks and LCSs, no qualification was assigned. The following sample results will be assigned UJ based on surrogate recovery (one or more outside the allowable range of 50- 150%). (e) Explosives: The second source verification of tetryl yielded %D of high bias (lot #s 0508053, 0708030, 0708235). However, no
Cmt.# Page # Line # New Page or Sheet App F, Added Section 2.7 Comment Shaw Environmental, Inc. 6 of 39 Recommendation Response tetryl was detected in the samples. No corrective action was taken (no qualification was assigned). (f) Volatiles: (a) Methyl acetate was below the lower control limit but within marginal failure limits in the presequence QC/MRL. 1,1,1- Trichloroethane, 1,1dichloroethane,cis-1,2dichloroehene, benzene, carbon disulfide, cyclohexane, ethyl- benzene, methylcyclohexane, styrene, toluene, and xylenes were below the lower control limit but within marginal failure limits. However, trans-1,2 dichloroethene, carbon tetrachloride, isopropylbenzene, methyl acetate and tetrachloroethene were below the lower control and marginal failure limits in the post-sequence QC/MRL. Thus, trans-1,2 dichloroethene, carbon tetrachloride, isopropylbenzene, methyl acetate and tetrachloroethene were assigned the qualifier “UJ”. Section 2.7 – Data Qualifications will be added to the MI Data Verification Report in Appendix F.
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