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0 0 <br />and where; <br />9. Selecting the frequency of sampling and length of <br />sampling period; <br />h. Selecting the types of samples (e.g., composites <br />vs. grabs and number of samples to be collected; <br />i. Documenting field sampling operations and <br />procedures, including: <br />Documentation of procedures forpreparation <br />of reagents or supplies which become an <br />integral part of the sample (e.g., filters, <br />preservatives, . adsorbing <br />Procedures and forms for recording the exact <br />location and specific consideration ' s <br />associated with sample acquisition; <br />iii. Documentation of specific sample preservation <br />method; <br />iv. Calibration of field instruments; <br />V. Submission of field -biased blanks, where <br />appropriate; <br />vi. Potential interferences present at the <br />facility; <br />vii. Construction materials and techniques, <br />associated with monitoring wells and <br />piezometers; <br />viii.Field equipment listing and sampling <br />containers; <br />ix. Sampling order; and <br />X. Decontamination procedures. <br />k. Sampling preservation; and <br />1. Chain -of -custody, including: <br />i. Standardized field tracking reporting forms <br />to establish sample custody in the field <br />prior to shipment; and <br />ii. Pre -prepared sample labels containing all <br />- 2 - <br />