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STOCKPILE SAMPLING
<br /> Stockpiles I - 24 are identified on Figure I. Stockpiles 101 - 115 are identified on Figure 2. The following
<br /> stockpiles will be sampled using the methods outlined below: 1, 2, 3, 4, 6, 7, 8, 9, 10, 11, 12, 17, 20, 21, 22,
<br /> smaller gradation materials (less than I inch) in 109, and 113.The following stockpiles have either already been
<br /> visually evaluated and cleared as non-impacted or will be visually evaluated during the upcoming sampling event:
<br /> 13, 14, 15, 16, 18, 19, 23, 24, 110, 1 1 1, 112, and 115. Stockpiles that have been visually evaluated with data
<br /> presented in the June 23, 2023 Submittal of Observations and Findings, Inspection of Stockpiles with Material Larger
<br /> than 1-inch Diameter, prepared by Pinyon include 13, 14, 15, and 19. Stockpiles 16, 18, 23, 24, 110, 1 1 1, 112,
<br /> and 115 have not yet been visually inspected, but will be during the sampling event.
<br /> 5-Point Composite Soil Sample Collection Method
<br /> Composite soil sampling will be used to evaluate stockpiles where sampling is required. The number of
<br /> composite samples collected from each stockpile will be determined by the stockpile size:
<br /> • Up to 1,000 cubic yards (yd3) - I composite sample. This includes stockpiles 2, 20, and 113.
<br /> • 1,000 yd3 to 10,000 yd3-2 composite samples. This includes stockpiles 3, 4, 6, 7, 8, 9, 10, 11, 12, 16,
<br /> 17, and 21.
<br /> • 10,000 yd3 to 100,000 yd3- 3 composite samples. This includes stockpiles I and 22.
<br /> • GFeateF than 100,0003
<br /> Each composite sample will include five aliquots. For the small (less than 1,000 yd3) stockpiles, 4 aliquot
<br /> locations will be selected on the sides and from the top to the bottom of the stockpile. For the larger stockpiles
<br /> (greater than 1,000 yd3), where more than I composite sample is collected, the stockpile will be segregated
<br /> into equally sized sections. For example, a 20,000 yd3 stockpile (in the 10,000 yd3 to 100,000 yd3 category)
<br /> would be divided into 3 equally sized sections.The sections will begin from the base of the stockpile and extend
<br /> to the top. In each section, 4 aliquot locations will be selected from the bottom to the top of the stockpile.
<br /> Aliquot samples will be collected from 0 to 12-inches below stockpile surface at each of these 4 locations.
<br /> The 5th aliquot for each composite sample will be collected with the assistance of an excavator.The excavator
<br /> will dig into stockpile/section as far as practical,without creating caving or collapse safety concerns, or without
<br /> affecting the integrity of other stockpile sections being sampled. The 5th aliquot sample will be collected from
<br /> the excavator bucket, from material that is removed from the interior of the pile.
<br /> From each aliquot location, one discrete soil sample will be collected. The sample will be placed in a 4-ounce
<br /> wide mouth glass sample jar and sealed. The jar will be labeled and temporarily held in cold storage. Once all
<br /> 5 aliquots are collected, each jar will be dumped into a decontaminated metal mixing bowl and thoroughly
<br /> mixed/homogenized. From this mixture, the composite sample for that stockpile or stockpile section will be
<br /> collected.
<br /> Once collected,each composite sample will be labeled, placed in cold storage,and ultimately transported under
<br /> chain of custody documentation to the project laboratory, Origins Laboratory, Inc., located in Denver,
<br /> Colorado. The laboratory will analyze each composite sample for PAH/PCP COCs.
<br /> Origins and Waypoint will follow all applicable Quality Control/Quality Assurance (QA/QC) procedures, for
<br /> analysis of the COCs using the analytical methods summarized above in Table 1. The samples will be submitted
<br /> and analyzed within allowable holding times. The sampling will be initiated within 2 weeks of DRMS acceptance
<br /> of this Plan.
<br /> Mr. Lucas West Page 4
<br /> Environmental Protection Specialist
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