The Real Dirt


J. Heath Parker, PE

SENIOR PROJECT ENGINEER

PARKER PG. 206-208 (LINES 14-12)

 

14·· · · Q· ··Now, were you involved in the remediation of a

15··landfill gas leak at the DFW landfill?

16·· · · A· ··Yes, sir.

17·· · · Q· ··And was that a Subtitle D landfill?

18·· · · A· ··Yes, sir.

19·· · · Q· ··So it had a lining?

20·· · · A· ··It does.

21·· · · Q· ··And in that case, did the gas migrate from the

22··landfill into the surrounding soil?

23·· · · A· ··Yes, but not through the liner.

24·· · · Q· ··What was the mechanism by which gas migrated to

25··the soil in that landfill?

1·· · · A· ··Gas migrated up the liner through the drainage

2··geocomposites and came out through -- it --

3·· · · Q· ··And then it moved to the soil in the vicinity

4··of the landfill?

5·· · · A· ··Correct.

6·· · · Q· ··Are soil conditions relevant to the design of

7··the landfill gas management system?

8·· · · A· ··Yes, sir.

9·· · · Q· ··What -- did you consider the soil conditions at

10··this site in the design of the landfill gas management

11··system?

12·· · · A· ··Yes, sir.

13·· · · Q· ··What -- did you do any work yourself to examine

14··the soil conditions?

15·· · · A· ··No, sir.··That would be outside my expertise.

16·· · · Q· ··How did you -- did you talk to anyone about the

17··soil conditions at the site?

18·· · · A· ··Yes, sir.

19·· · · Q· ··Okay.

20·· · · A· ··Mike Snyder.

21·· · · Q· ··Mike Snyder?··And based on your conversations

22··with him, what type of soils did you assume were

23··dominant at the site?

24·· · · A· ··Clay.

25·· · · Q· ··And based on your conversations with him –

1··well, what is meant when we say "secondary feature" in

2··reference to soils?

3·· · · A· ··If there's a -- cracks or fissures or such that

4··gas could travel through those would be considered

5··secondary features.

6·· · · Q· ··And what was your assumption based on your

7··conversations with Mr. Snyder regarding the potential

8··for secondary features to be present at the site?

9·· · · A· ··There's no secondary features present.

10·· · · Q· ··Do you know what the basis was for his

11··conclusion there were no secondary features present?

12·· · · A· ··I do not.

 

 

PARKER PG. 210-212 (LINES 2-10)

 

 2·· · · Q· ··And did you make any determination of how deep

3··that gravelly soil is in those areas?

4·· · · A· ··Based on the source of this, I would assume

5··it's a shallow soil.

6·· · · Q· ··But did you do any evaluation to determine

7··that?

8·· · · A· ··No, not personally.

9·· · · Q· ··And did you ask Mr. Snyder how deep that

10··gravelly soil went?

11·· · · A· ··I did.

12·· · · Q· ··What did he say?

13·· · · A· ··This particular is probably no more than 3- to

14··5-foot deep.

15·· · · Q· ··And do you know what the basis was for his

16··opinion?

17·· · · A· ··My understanding would be based on samples he

18··took at the site.

19·· · · Q· ··Now -- and can gas travel through soil that's

20··3- to 5-feet deep?

21·· · · A· ··Typically, no, that gas would vent to the

22··surface if it were in gravelly soil that deep -- or that

23··shallow.

24·· · · Q· ··Do you know the extent of gravel beneath that

25··soil?

1·· · · A· ··Beneath what soil?

2·· · · Q· ··Beneath the Wilson gravelly loam.

3·· · · A· ··Based on conversations with Mr. Snyder, I

4··understand there's not much of any gravel below there.

5·· · · Q· ··And as well, do we have -- do you see FeE on

6··this figure?

7·· · · A· ··Yes, sir.

8·· · · Q· ··Is that maroon?

9·· · · A· ··We'll go with that.

10·· · · Q· ··What type of soil is that?

11·· · · A· ··That's gravelly soil.

12·· · · Q· ··Is that present in much of the area around the

13··site?

14·· · · A· ··It looks like there's a decent bed outside of

15··the landfill.

16·· · · Q· ··And did you determine the depth of that soil at

17··the site?

18·· · · A· ··I've made no determination of it.

19·· · · Q· ··Now, in looking back at the Wilson gravelly

20··clay loam, had you made any determination of those

21··depths prior to your -- did you make any determination

22··of those depths when you were developing the landfill

23··gas management plan?

24·· · · A· ··I did not use this drawing to develop the

25··landfill gas management plan.

1·· · · Q· ··So did you consider these types of soils when

2··developing the landfill gas management plan at all?

3·· · · A· ··I only considered the soils that were in

4··Mr. Snyder's geology report.

5·· · · Q· ··And did he identify these gravelly soils in his

6··geology report?

7·· · · A· ··He did not.

8·· · · Q· ··So you didn't consider the soil types when

9··developing your landfill gas management plan?

10·· · · A· ··No, sir.

 

 

PARKER PG. 215-218 (LINES 17-8)

 

17·· · · Q· ··Within the boundaries of the facility, does

18··that map indicate the presence of intermittent streams?

19·· · · A· ··Intermittent streams?

20·· · · Q· ··Streams, yes.

21·· · · A· ··There's surface water bodies.··I'm no expert at

22··telling what is intermittent streams or not.

23·· · · Q· ··On this map, do blue lines generally represent

24··surface streams on such a map?

25·· · · A· ··Yes, sir.

1·· · · Q· ··And are some of those surface streams located

2··within the site?

3·· · · A· ··I see some within the facility boundary, yes,

4··sir.

5·· · · Q· ··And do those generally -- looking at Page 118

6··of Protestants' Exhibit 20, do those streams generally

7··run within the floodplain that's marked here?

8·· · · A· ··Could you repeat that question?

9·· · · Q· ··Yes.··Let's look to the -- just to the west of

10··the landfill footprint.

11·· · · A· ··(Witness complies).

12·· · · Q· ··As we look at Page 118, is there an

13··intermittent stream that runs from north to south just

14··to the west of the landfill footprint?

15·· · · A· ··I do see a stream there.

16·· · · Q· ··And now looking at -- on Protestants'

17··Exhibit 20, do you see, is the floodplain indicated by

18··blue lines?

19·· · · A· ··Yes, sir.

20·· · · Q· ··And would that intermittent stream flow come

21··generally through that floodplain there just to the west

22··of the site?

23·· · · A· ··It appears so.

24·· · · Q· ··Now, how are the landfill gas probes marked on

25··Exhibit -- Protestants' Exhibit 20?

1·· · · A· ··With a dark circle and then circled by a

2··lighter circle.

  • 3·· · · Q· ··And we just discussed the dark blue lines here

    4··represent the extent to the 100-year floodplain.

    5·· · · · · · · · THE REPORTER:··I'm sorry.··I can't hear

    6··you.

    7·· · · Q· ··(BY MR. ALLMON)··I said and the dark blue lines

    8··on Protestants' Exhibit 20 designate the extent of the

    9··100-year floodplain?

    10·· · · A· ··Correct.

    11·· · · Q· ··Now, as we look -- do you see where Gas Probe

    12··23 is located there just to the west of the floodplains?

    13·· · · A· ··Yes, sir.

    14·· · · Q· ··Is the intermittent stream in between the

    15··landfill and that probe?

    16·· · · A· ··Yes, sir.

    17·· · · Q· ··Is the floodplain in between the landfill and

    18··that probe?

    19·· · · A· ··Yes, sir.

    20·· · · Q· ··So could gas reach that -- could landfill gas

    21··from the landfill reach that stream without being

    22··detected at that probe?

    23·· · · A· ··Theoretically.

    24·· · · Q· ··Well, based on the physical presence of the

    25··soils and the configuration of landfill footprint at

    1··this site, could landfill gas reach that intermittent

    2··stream without being detected by that probe?

    p

    3·· · · A· ··It's unlikely gas would reach that stream, but,

    4··yes.··If it were to, it would be undetected by the

    5··probe.

    6·· · · Q· ··Is there any other probe that would detect

    7··landfill gas before reaching that stream?

    8·· · · A· ··No, sir.

     

    PARKER PG. 219 (LINES 1-24)

     

    1·· · · A· ··Just because there's a probe at a -- at a

    2··boundary doesn't make it likely that gas will reach that

    3··point.

    4·· · · Q· ··But your monitoring would not detect that?

    5·· · · A· ··Would not detect what?

    6·· · · Q· ··That gas would reach the intermittent stream.

    7·· · · A· ··If gas should reach the stream, correct, the

    8··probe would not detect it.

    9·· · · Q· ··And is that also true as we look at the

    10··southwest corner of the site?

    11·· · · A· ··Just in the lower left-hand area of this

    12··figure.··Is what correct?

    13·· · · Q· ··The -- the intermittent stream is more

    14··proximate to the landfill footprint than the gas

    15··monitoring probe.

    16·· · · A· ··The stream is between the probe and the

    17··landfill, yes, sir.

    18·· · · Q· ··And is -- are you doing -- is the Applicant

    19··doing the monitoring of the stream to determine whether

    20··landfill gas has contaminated that waterway?

    21·· · · A· ··Not to my knowledge, no.

    22·· · · Q· ··Are there gas monitoring probes located within

    23··what's been determined to be 100-year floodplain?

    24·· · · A· ··Yes, sir.

     

     

    PARKER PG. 221-223 (LINES 12-3)

     

    12·· · · Q· ··Now, how well do these monitoring probes

    13··function when they're under water?

    14·· · · A· ··Surface water would have no effect on these

    15··probes.

    16·· · · Q· ··If this probe was inundated from above by

    17··water, would that flood the probe?

    18·· · · A· ··Only if it -- no.··They're sealed.

    19·· · · Q· ··How are they sealed?

    20·· · · A· ··They're sealed with a cap on top.

    21·· · · Q· ··At what height is the cap?

    22·· · · A· ··They're generally 3 to 4 foot above ground.

    23·· · · Q· ··Are these airtight?

    24·· · · A· ··Yes, sir.

    25·· · · Q· ··Are they watertight?

    1·· · · A· ··If they're airtight, they're watertight.

    2·· · · Q· ··Did you consider anyway the location of the

    3··floodplain in your design of the monitoring system?

    4·· · · A· ··I think if it was possible to avoid a probe

    5··being in there, we did.··But to maintain spacing, there

    6··was no choice but to be inside the floodplain.

    7·· · · Q· ··So there would be no way to reorient the design

    8··in order to avoid the floodplain?

    9·· · · A· ··There may have been a way to do it but not a

    10··preferred way.

    11·· · · Q· ··Did you make any attempt to do that?

    12·· · · A· ··I did not.

    13·· · · Q· ··In developing the landfill gas management plan,

    14··did you consider the location of the floodplain?

    15·· · · A· ··I considered it.

    16·· · · Q· ··How did it factor into your design?

    17·· · · A· ··I think I just ran through that.··I try to

    18··avoid putting probes in it.··But where I couldn't, then

    19··I did it.

    20·· · · Q· ··Are the probes -- generally what's the distance

    21··between the probes?

    22·· · · A· ··They are generally 600 foot apart on most of

    23··the landfill and 300 foot apart on the north side.

    24·· · · Q· ··And is 600 foot the minimum distance required

    25··by the TCEQ?

    1·· · · A· ··TCEQ doesn't have a minimum required distance,

    2··but generally on most sites, the minimal distance is

    3··1,000 feet.

     

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