Methodology for generating waste volume estimates Page: 20 of 58
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3.12.2 Step 2-Follow the soil logic diagram
The information available about the site indicated that no documents were currently
available, but that a PA/SI and two phases of RI work were to be conducted for the site.
Based on this information, the estimator can use the soil logic diagram (Fig. 2) to determine
how the waste estimates should be calculated. The shaded path on the logic diagram
presented in Fig. 3 depicts the appropriate path for this scenario.
3.1.23 Step 3-Determine the number and depth of samples
Using the area to be sampled (as calculated in Step 1) the estimator can now determine
the number and depth of samples for each phase of investigation using Tables 5 and 6. The
estimator should locate the appropriate site type (i.e., storage pad) on the tables and should
then record the number of samples and their depth for use in Step 5. Thus, for the current
scenario, 8 PA/SI samples would be required for this area of 7500 ft2, the RI Phase I area of
15,000 ft2 would require 10 samples, and the RI Phase II area of 30,000 ft2 would require
12 samples. The depth of the PA/SI samples would be the thickness of the pad (6 in.) plus
6 in. of soil for a total of 1 ft. The depth of the RI Phase I and Phase II samples would be
refusal or, in this case, 20 ft (see Sect. 3.1.2).
3.12.4 Step 4-Follow the methodology outlined in the logic diagram
Waste estimates can now be generated using the following:
" The area to be sampled as calculated in Step 1.
PA/SI = 7500 ft2,
RI Phase I = 15,000 ft2, and
RI Phase II = 30,000 ft2.
" The methodology outlined in the logic diagram (Fig. 3).
" The criteria contained in Tables 5 and 6 for determining the number and depth of
samples.
PA/SI-8 samples to a depth of 1 ft,
RI Phase I-10 samples to refusal (20 ft), and
RI Phase II-12 samples to refusal (20 ft).
" The criteria for estimating wastes in Tables 1 and 3 (remember the swell factor of 1.4!).
The waste estimates for this site will then be calculated as outlined below.
Estimate waste soil cuttings
" PA/SI-Not applicable for the PA/SI phase because the pad plus 6 in. is less than the 2-ft
cutoff for surface-soil sampling (see Sect. 2.1).
" RI Phases I and II-Estimate volume based on the diameter and depth of the boreholes,
using the following equation:
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Miller, J. Q.; Hale, T. & Miller, D. Methodology for generating waste volume estimates, report, September 1, 1991; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc1060111/m1/20/: accessed May 7, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.