|
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 /> 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 /> Field judgement will be used to select the five aliquot subsample locations, due to expected variations in
<br /> stockpile sizes and shapes.
<br /> Individual aliquot sample naming/nomenclature will be as follows:
<br /> • Project Indicator: BSP— Butala Stockpile
<br /> • Sample Type: SS = Soil; BD = Blind Duplicate; RB = Rinse Water Blank
<br /> • Sample Location/Sequence:Stockpile number(e.g., 1,2, 3,etc.);##=Sequential number of specific QA/QC
<br /> type (e.g., BD01)
<br /> • Sample Date:YYYYMMDD
<br /> Mr. Lucas West Page 4
<br /> Environmental Protection Specialist
<br />
|