1999-04-12_HYDROLOGY - M1974052 ‎(7)‎

• Permit No: M1974052
• IBM Index Class Name: Hydrology
• Doc Date: 4/12/1999
• Doc Name: WORK PLAN VARRA COAL ASH BURIAL PROJECT WELD COUNTY COLO CGRS #1-135-2755
• Media Type: D
• Archive: No

CGRS, Inc. ~ •
' TABLE 1 -Results for Hydraulic Conductivity and Porosity Tests

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Sample H) Hydraulic Porosity
Conductivity
K R/da
Cherokee Silo Ash 2/3
0.24 0.51
Cherokee 4 Ash with Sodium
0.23 0.46
Class F Silo Ash with Gypsum
0.09 0.49
Bottom Ash
178. 0.51
Recycled Concrete
111. 0.29
Recycled Asphalt
130. 0.33
' The bottom ash, the recycled concrete and the recycled asphalt all had relatively high hydraulic
conductivity values in the range of 11 I to 178 feet day. The three fly ash samples had very low
' hydraulic conductivity values in the range of 0.09 to 0.24 feet/day. The porosity of the fly and
bottom ash ranged from 0.46 to 0.51. These values are characteristic of very fine porous
' materials. The porosity of the recycled concrete and asphalt was 0.29 and 0.33, respectively.
' 2.3 Aualvtical Data
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2.3.1 "Sequeutial Extraction Leaching Procedure" (SEEP)
The purpose of the "Sequential Extraction Leaching Procedure" (SEEP) test was to determine the
total quantity of the various chemical contaminants that may be potentially leached from the ash.
The SEEP test used synthetic groundwater with varying pH levels as the leaching Fluid(s). With the
SEEP test, a specified weight (e.g. one kilogram) of the ash was combined with a specified volume
of water (e.g. one liter) and agitated by rolling for a specified period of time (e.g. 18 hours). This
represented a single extraction. The concentration of the chemical contaminant was then measured
in the water. The SEEP test was repeated for several sequential extractions until most of the
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