A.4.2 ISM Sampling Patterns

Figures A-4–A-7show the 64 different IS patterns that are evaluated and summarized in the results section. For all four figures, each row of plots represents a different number of replicates gathered from the DU (2, 3, 4, and 5), and each column of plots identifies a different number of increments per replicate (16, 30, 49, and 100). Figures A-4 and A-5 show the standard IS procedure with replicate ISs over the entire DU for systematic and random grid sampling. respectively. Figures A-6 and A-7represent the grouped IS methods for systematic and random grid sampling, respectively. These figures show the general structure for each of the evaluated patterns but represent only an example of one random selection for each pattern. Figure A-8 shows the random and systematic discrete sampling types that were evaluated using sample sizes of 9, 16, 30, and 100. Once again, these examples show the general structure for each of the evaluated sampling types and only represent one random selection for each pattern.

Standard incremental sampling using a systematic grid sampling approach.  Each column represents a differing number of increment per IS, and each row depicts the differing number of ISs that were gathered.

Figure A-4. Standard incremental sampling using a systematic grid sampling approach.
Each column represents a differing number of increment per IS, and each row depicts the differing number of ISs that were gathered.

Figure A-5. Standard incremental sampling using a random grid sampling approach. Each column represents a differing number of increment per IS, and each row depicts the differing number of ISs that were gathered.

Figure A-5. Standard incremental sampling using a random grid sampling approach.
Each column represents a differing number of increment per IS, and each row depicts the differing number of ISs that were gathered.

Figure A-6. Grouped incremental sampling using a systematic grid sampling approach. Each column represents a differing number of increment per IS, and each row depicts the differing number of ISs that were gathered.

Figure A-6. Grouped incremental sampling using a systematic grid sampling approach.
Each column represents a differing number of increment per IS, and each row depicts the differing number of ISs that were gathered.

Figure A-7. Grouped incremental sampling using a random grid sampling approach. Each column represents a differing number of increment per IS, and each row depicts the differing number of ISs that were gathered.

Figure A-7. Grouped incremental sampling using a random grid sampling approach.
Each column represents a differing number of increment per IS, and each row depicts the differing number of ISs that were gathered.

Figure A-8. Discrete sampling using a systematic grid (top row) and random grid (bottom row) sampling approaches.  Each column represents a differing number of increments or discrete samples (from left to right 9, 16, 30, and 100 samples per evaluation).

Figure A-8. Discrete sampling using a systematic grid (top row) and random grid (bottom row) sampling approaches.
Each column represents a differing number of increments or discrete samples (from left to right 9, 16, 30, and 100 samples per evaluation).