REP46184

• Permit No: M1986104
• IBM Index Class Name: Report
• Doc Name: ENVIRONMENTAL SITE INVESTIGATION
• Media Type: D
• Archive: No

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5.0 SOIL ANALYSIS
' This section describes the analytical results for soil samples obtained as part of the Environmental
Site Investigation of the Montgomery Pit. Sampling was performed by TechLink Environmental,
Inc. on Mazch 26,1999. A total of 8 soil samples were sent to the laboratory. Five soil samples were
' taken from the'/<-inch rock pile and three soil samples were taken at original release location.
Laboratory results for soil samples are shown in Table 1.
' S.1 Laboratory Analysis
All samples were analyzed for Total Petroleum Hydrocazbon (TPH) in the diesel range of C8 to C30,
' and for the herbicides 2,4-D (2,4-Dichlorophenoxyacetic Acid) and Dicamba. Analyses were
performed by ACZ Laboratories, in Steamboat Springs, Colorado.
' Furthermore, four soil samples with the highest PID readings were selected from the 3/4-inch rock
pile group of samples, and two from the original release azea (Road Base Pile). These six soil
' samples were sent to the Pacific Agricultural Laboratory, in Portland, Oregon, for Bromacil analysis.
These analysis were performed since the Repco II weed killer contained according to manufacturer
specifications a 1 %Bromacil. Laboratory analytical results and the chains of custody aze contained
in the Appendix.
5.2 Analytical Results
' 5.2.1 Total Petroleum Hydrocarbon (TPH)
' Soil samples were analyzed for TPH in the diesel range (C8 to C30). Ofthe soi18 samples analyzed,
only 3 samples (S75, 545, S30) had detected concentrations of 5, 6 and 7.3 mg/kg, respectively.
According to the Colorado Petroleum Storage Tank Guidance Document (February 1999) the most
' stringent soil screening level for TPH is 100 mg/kg. Therefore, TPH values in the rock pile and in
the subsoil aze all below the Colorado screening levels.
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5.2.2 2,4-D, and Dicamba
The chemical products 2,4-D and Dicamba were not identified in any of the soil samples.
5.2.3 Bromacil
The third constituent in the Repco Kill lI weed killer is Bromacil. Six soil samples were analyzed
for Bromacil. Two samples were selected from the original release area (Road Base) and four from
the'/.-inch rock pile. Three samples (5225, Ssubsoil S, Ssubsoil NW) had undetected concentrations
of Bromacil. Soil samples S30 (0.073 mg/kg) and 5285 (0.080 mg/kg) showed concentrations
slightly above the Method Detection Limit (0.033 mg/kg). The highest concentration of Bromacil
detected was in sample S45 (0.26 mglkg). No limit has been established by the EPA or by the
Environmental Slle Investlgatlon Monlgomcry Pil
TechLink Environmental, Inc. 9 B&B Excavating