47
DRAFT Data Evaluation for the Quail Run Dioxin Excavation Site I. Introduction A statistical analysis has been performed on the sample and excavation depth data gathered at the Quail Run Mobile Hone Park (MHP). This effort was an attempt to identify the correlation between 2,3,7,8 tetrachlorodibenzo-p-dioxin (TCDD) concentrations and soil depth of contamination for the Quail Run site. The evaluation and interpretation of the subject data and subsequent results has considered the effects of sample location, condition and type of soil area sampled i.e. roadway, shoulder, offset sections, disturbed or undisturbed soil (based on currently available information). The effects of site relief, soil erosion, weather, other environmental factors or unknown soil disturbance situations undoubtedly cannot be adequately or appropriately considered. A concentration-depth relationship curve (Figure 1) has been generated which will allow the extrapolation of a contaminant level for a given depth, or vice versa. A curve (Figure 2) was also generated that predicts excavation depth for a given concentration at the surface, based on a TCDD clean up level of 1 ppb. These curves are for Quail Run only or sites that are similar in nature to Quail Run. II. Site Description/History The site formerly (prior to excavation) consisted of a roadway, adjacent trailer pads and grassed yard areas, an open field and a low lying grassed area with a three-cell domestic waste stabilization pond (WSP). Relief across the site varies 96 feet with an elevation of 1866 ft. at the entrance, 1840 ft. at

DATA EVALUATION FOR THE QUAIL RUN DIOXIN ...excavation depth data gathered at the Quail Run Mobile Hone Park (MHP). This effort was an attempt to identify the correlation between 2,3,7,8

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Page 1: DATA EVALUATION FOR THE QUAIL RUN DIOXIN ...excavation depth data gathered at the Quail Run Mobile Hone Park (MHP). This effort was an attempt to identify the correlation between 2,3,7,8

DRAFTData Evaluation for the Quail Run Dioxin Excavation Site

I. Introduction

A statistical analysis has been performed on the sample and

excavation depth data gathered at the Quail Run Mobile Hone Park

(MHP). This effort was an attempt to identify the correlation

between 2,3,7,8 tetrachlorodibenzo-p-dioxin (TCDD) concentrations

and soil depth of contamination for the Quail Run site. The

evaluation and interpretation of the subject data and subsequent

results has considered the effects of sample location, condition

and type of soil area sampled i.e. roadway, shoulder, offset

sections, disturbed or undisturbed soil (based on currently

available information). The effects of site relief, soil

erosion, weather, other environmental factors or unknown soil

disturbance situations undoubtedly cannot be adequately or

appropriately considered. A concentration-depth relationship

curve (Figure 1) has been generated which will allow the

extrapolation of a contaminant level for a given depth, or vice

versa. A curve (Figure 2) was also generated that predicts

excavation depth for a given concentration at the surface, based

on a TCDD clean up level of 1 ppb. These curves are for Quail

Run only or sites that are similar in nature to Quail Run.

II. Site Description/History

The site formerly (prior to excavation) consisted of a

roadway, adjacent trailer pads and grassed yard areas, an open

field and a low lying grassed area with a three-cell domestic

waste stabilization pond (WSP). Relief across the site varies 96

feet with an elevation of 1 8 6 6 ft. at the entrance, 1 8 4 0 ft. at

Page 2: DATA EVALUATION FOR THE QUAIL RUN DIOXIN ...excavation depth data gathered at the Quail Run Mobile Hone Park (MHP). This effort was an attempt to identify the correlation between 2,3,7,8

the midline point and 1770 ft. at the far back side of the MHP

near the WSP.

Portions of the site soils were disturbed prior to the April

1985 subject excavation of contaminated soil. Mr. Chlanda,

former owner of the MHP, removed the upper few inches of the

original roadway surface and reportedly spread the material in

the open field west of the WSP. Chlanda also bulldozed excavated

road material across sections 31 thru 34 to fill an area used as

a construction site for his barn. This area is directly west of

the MHP on the Chlanda residential property.

Samples (historical) of soil were collected throughout the

MHP prior to the removal effort in an attempt to define the level

and extent of TCDD contamination. Historical data was not used in

this study because of the variations in sampling methodologies

and length of time between the historical samples and samples

assoc ia ted with the removal e f fo r t . During the

excavation/removal action initiated in February 1985, surface

soil samples were collected from specifically identified sections

within the MHP. During the excavation effort these sections were

excavated to a depth where TCDD concentrations (95% upper

confidence limit) were statistically below 1 ppb. Section

excavations at times required removal of more than one "lift."

The recorded depths of each lift or final excavation are rough,

within j; 10 to 20 percent of the recorded depth, due to the

fairly crude method of soil removal and variation in section

relief. Also geographically/physically different sections were

excavated e.g. roadways, shoulders, offsets. As previously

mentioned, the roadway and some shoulder and offsets section

Page 3: DATA EVALUATION FOR THE QUAIL RUN DIOXIN ...excavation depth data gathered at the Quail Run Mobile Hone Park (MHP). This effort was an attempt to identify the correlation between 2,3,7,8

soils were previously disturbed according to the available

information. This disturbance will have undoubtedly altered the

normal soil compaction, percolation potential and other normal

soil conditions. The road sections were not only disturbed by

bulldozing, laying utilities, etc. but also had a gravel matrix

which would differ significantly as compared to a native soil

matrix. ..-.,

III. Statistical Analysis _;

A. Basic Assumptions C

Prior to the statistical analysis all data was screened in Q

an effort to normalize the effect of extreme values. The

statistical analysis was based on data that was considered to be

as consistent and similar as possible to improve the significance

of the analysis and correlation of data. All data gathered from

areas that were considered to have been previously disturbed,

prior to the February 1985 removal action, were not considered at

this time. This primarily eliminated the roadway and some

shoulder and offset sections, as previously identified. The

initial screening of data indicated that the disturbed section

data was statistically dissimilar to the majority of undisturbed

section data. This data, however, could be considered at a later

time.

Another important initial assumption was the assumption of

isotropic soil conditions. This assumption is probably most

valid in areas not previously disturbed, providing additional

support to the elimination of disturbed soil sections.

Page 4: DATA EVALUATION FOR THE QUAIL RUN DIOXIN ...excavation depth data gathered at the Quail Run Mobile Hone Park (MHP). This effort was an attempt to identify the correlation between 2,3,7,8

The sampling techniques and laboratory procedures (QA/QC

methodology) were also assumed to be consistent throughout the

sampling and removal action. In addition, it was assumed that

each analytical data point truely represents the contaminant

concentration at the corresponding depth.

B. Data Analysis

All data has been listed in a table (enclosed in Appendix A)

which presents the section, depth of (lift) excavation, surface _

and lift TCDD concentrations, section type (i.e. roadway, offset) 0

and condition (i.e. dis turbed/undisturbed) . Init ial ly the

undisturbed shoulder and of fse t sections were manipulated °

independently. This, however, led to the reasonable combination

of these two sets of data, since statistically these two section

types were similar (Appendix B, calculat ions) . Depth of

excavation for these sections were compared to the corresponding

concentration of TCDD in parts per billion. TCDD concentrations

below 1 ppb, though above the detection l imit , were also

considered in the analysis. A median value, considering all

data, was calculated for each depth and type of section (offset

or shoulder). The median values were used in the determination

of the slope and y-intercept for each set (offset and shoulder)

of data and the combination set of data. These values are shown

in Table 1.

Median values for offsets sections included data only up to

the greatest depth of offset excavation, 8 inches. Calculation

of the median value for shoulder sections included only

excavation depths to 12 inches due to the fluctuation of data

available for greater depths. The slope of the line on a plot of

Page 5: DATA EVALUATION FOR THE QUAIL RUN DIOXIN ...excavation depth data gathered at the Quail Run Mobile Hone Park (MHP). This effort was an attempt to identify the correlation between 2,3,7,8

depth versus concentration for the shoulder data greater than 12

inches unrealistically became positive, indicating depths of

excavation above ground surface. l-"

A linear least square method using the median value was

performed in an effort to find the slope of the In (natural log)

concentration versus depth. Subsequently the Student's t-

Distribution using various confidence limits (95, 60, 5 0 % ) was

applied to find possible slope and y intercept ranges. The 95% 0o

and 50% confidence limits were found to correlate to the shoulder —i

and offset data, respectively. These confidence limits presented

the data in a manner that realistically corresponded to the

potential depths of excavations. The final slope of the combined

offset and shoulder section data sets was within the 5 0 %

confidence limit. Figure 1 presents the graph showing the depth

versus concentration relationship. Figure 2 presents the

excavation depth for a given surface concentration based on a 1

ppb TCDD cleanup level. Sample calculations are attached in the

Appendix of this report.

00

Page 6: DATA EVALUATION FOR THE QUAIL RUN DIOXIN ...excavation depth data gathered at the Quail Run Mobile Hone Park (MHP). This effort was an attempt to identify the correlation between 2,3,7,8

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Page 9: DATA EVALUATION FOR THE QUAIL RUN DIOXIN ...excavation depth data gathered at the Quail Run Mobile Hone Park (MHP). This effort was an attempt to identify the correlation between 2,3,7,8
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Page 11: DATA EVALUATION FOR THE QUAIL RUN DIOXIN ...excavation depth data gathered at the Quail Run Mobile Hone Park (MHP). This effort was an attempt to identify the correlation between 2,3,7,8

APPENDIX A

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Page 39: DATA EVALUATION FOR THE QUAIL RUN DIOXIN ...excavation depth data gathered at the Quail Run Mobile Hone Park (MHP). This effort was an attempt to identify the correlation between 2,3,7,8

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Page 40: DATA EVALUATION FOR THE QUAIL RUN DIOXIN ...excavation depth data gathered at the Quail Run Mobile Hone Park (MHP). This effort was an attempt to identify the correlation between 2,3,7,8

APPENDIX B

Page 41: DATA EVALUATION FOR THE QUAIL RUN DIOXIN ...excavation depth data gathered at the Quail Run Mobile Hone Park (MHP). This effort was an attempt to identify the correlation between 2,3,7,8

Statistical Analysis

A. Assumptions

1. Unsaturated zone is isotropic.

2. Sample collection and laboratory analyses (i.e., QA/QC) were

properly handled.

3. Each analytical result has truely represented the

contamination level at the corresponding depth.

4. All disturbed areas were not considered in the statistical

analysis.

5. An extreme data value will be used as the critical cutoff

point for the analysis. 0

6. Offset section data were used as the basis for analysis

since most of these sections had not been disturbed prior to

the removal effort.

Page 42: DATA EVALUATION FOR THE QUAIL RUN DIOXIN ...excavation depth data gathered at the Quail Run Mobile Hone Park (MHP). This effort was an attempt to identify the correlation between 2,3,7,8

Statistical Analysis3. Procedure

1. Obtain the median of each set of data, at each depth andconsider approximately 50% of the occurrence frequency.

2.

-rrc,e»Mer\c*J

Apply linear least square method to find slope and intercept

values, y = mx + b

3. Apply student's t distribution with reasonable confidence

limits to find slope and intercept ranges.

4. Compare slope ranges of the offset area with the shoulder

area to find the critical cutoff data point for the shoulder

area.

5. Within reason combine the slope of offset area and shoulder

area ••

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