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• Appendix A the identity of the field duplicate samples and no special sample handling prot col will be employed during collection,shipment,or analysis of the field duplicate samples. These I lind duplicate QC samples will be submitted and analyzed on a frequency of 10 percent of the total sampl ng effort(i.e.,the first sample and every tenth sample thereafter)for every sample matrix. Areas of k lown contamination or critical sampling points may be preferentially selected for submittal as blind di plicates. QC duplicate samples will be analyzed for the same parameters as the corresponding primar r sample. A1.3.3 Matrix Spike and Matrix Spike Duplicate Sam les Matrix spike and matrix spike duplicate samples are submitted to the laboratoxy for the purpose of assessing the effect of the matrix on the accuracy and precision of the analytic il method. A known concentration of the compound of interest is spiked into two sub samples of the sample designated for MS/MSD analysis. The percent recovery of the spiked compound is used to aisess the effect of the sample matrix on the accuracy of the analysis,while the relative percent diff ence(RPD)between the two spiked sample results is used to assess the effect of the matrix on the prec sion of the analysis. Sufficient sample volume will be collected for MS/MSD analysis at a rate of 0 percent of the total sampling effort per matrix. A1.4 Decontamination Procedures Sampling personnel will wear disposable gloves and use disposable sampling equipment during the collection of soil and water samples. Sampling equipment includes disposabl hand trowels, stainless steel sampling sleeves,Encore"m samplers,and disposable bailers. The excai ation bucket will be brushed out to remove loose soil once it is emptied following sample collection.No other decontamination of sampling equipment will be necessary. A1.5 Sample Handling and Custody This section describes the procedures for sample handling and custody,incl u ing sample labeling, sample packing,chain of custody and proper field documentation. A1.5.1 Sample Labeling Using indelible ink,all samples will be labeled at the time of sampling. Labe Is will identify the sample identification number,sampler's name,date and time of sample collection, a of sample(primary or field QC),depth,preservatives added(if any),and analyses to be performed y method number). Sample identification numbers will be linked to the site and location where each sample originated. Owing to the possibility for labels to float/soak off of their containers,re-seal able plastic bags(e.g., ZiplocTm)will be used to enclose the containers. Table 1 provides specific ir formation regarding planned sample Identification(11))numbers for each of the proposed samples. The following number system will be used in confirmatory sampling: • Sample Area: A three or four letter abbreviation for the sample site station • Sample Method: A two letter abbreviation for the type of sample locatio (e.g.,TP for test pit,EX for excavation) • Sample location: FL for Trench Floor and SW for sidewall KB61125 APPENDIX A MACTEC Engineering and Consulting, Inc. A8 September 28,2005