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Diagnostics Commercial & Residential www.vaporremoval.com - - PowerPoint PPT Presentation

Nov 20, 2023 228 likes •598 views

Diagnostics Commercial & Residential www.vaporremoval.com (330) 915.2650 Tony McDonald A-Z Solutions, Inc 03.24.15 RN VS VI RN generally has less barriers to public presentation. Homeowners give permission without hesitation. VI

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SLIDE 1

Diagnostics

Commercial & Residential

Tony McDonald

A-Z Solutions, Inc 03.24.15

www.vaporremoval.com

(330) 915.2650

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SLIDE 2

RN VS VI

 RN generally has less barriers to public presentation.

Homeowners give permission without hesitation.

 VI generally has a plethora of obstacles and associated

paperwork.

 I use RN for diagnostics and pathway identification

examples when practical for this reason.

 Any of these project could be VI, RN, or both!

A-Z Solutions, Inc - 330.915.2650 - Tony@vaporremoval.com

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SLIDE 3

What is “Diagnostics”?

 Compiling a dataset of sub-slab airflow measurements at

varying pressure for a structure. From this data a functional system design is extrapolated.

 In simple terms diagnostics is the process of designing a site

specific SSD System.

 Diagnostics is a mixture of science, field experience, and

feel.

 This presentation is about decision making based on

diagnostics, not the actual technical process of conducting diagnostics.

A-Z Solutions, Inc - 330.915.2650 - Tony@vaporremoval.com

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SLIDE 4

Disconnected Pathways

A-Z Solutions, Inc - 330.915.2650 - Tony@vaporremoval.com

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SLIDE 5

House Background

 Located in Central Ohio.

 Local geology includes Utica and Marcellus Shale Formations.  Initial Radon Levels:

 First Floor - 148 pCi/L.  Basement - about 250 pCi/L. All testing was conducted on first floor.

 No VI at site.  Original system installed by another contractor.  We were called in by the homeowner after the original

contractor was unable to mitigate the house.

A-Z Solutions, Inc - 330.915.2650 - Tony@vaporremoval.com

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SLIDE 6

Pre-Mitigation RN Graph

20 40 60 80 100 120 140 160 180 200 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 57 59 61 63 65 67 69 71 Hourly 4.0 pCi/L Average

A-Z Solutions, Inc - 330.915.2650 - Tony@vaporremoval.com

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SLIDE 7

Where We Started

2 X GP501

  • 2.75”

90 CFM FR150

  • 1.4”

40 CFM

A-Z Solutions, Inc - 330.915.2650 - Tony@vaporremoval.com

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SLIDE 8

Where to start?

 The contractor used the “Poke and

Hope” method. Poke a hole in the concrete, hope it works!

 Throughout the process the contractor

never conducted diagnostics.

 Without diagnostic data you have no

basis for proper decision making.

 We also want to look for clues in the

hourly RN data.

A-Z Solutions, Inc - 330.915.2650 - Tony@vaporremoval.com

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SLIDE 9

Final Contractor RN Data

20 40 60 80 100 120 140 160 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 Hourly 4.0 pCi/L Average

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Communication Test Results

WOW!

A-Z Solutions, Inc - 330.915.2650 - Tony@vaporremoval.com

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SLIDE 11

With PFE like this what could be the problem?

 All test holes showed adequate PFE.  RN / VI Systems are also called Sub-Slab

Depressurization systems for a reason right? You depressurize the slab and the RN/VI goes away.

 NOT ALWAYS….

A-Z Solutions, Inc - 330.915.2650 - Tony@vaporremoval.com

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SLIDE 12

Recognizing Disconnected Pathways

( above 50 pCi/L )

 No amount of pressure on this slab was going to fix the RN

problem.

 Abnormally high RN levels are not usually associated with

extremely high concentrations of U in the ground. They are caused by excessive positive pressure from the soil.

 Absence of positive pressure under the slab with the system

  • ff should point you to finding an additional pathway with

positive pressure.

 Adequate PFE and insignificant RN reduction means you

missed at least one pathway.

 At this house the RN is coming through the walls via

pressure from the shale.

 Relieve the pressure on the walls to fix the RN.

A-Z Solutions, Inc - 330.915.2650 - Tony@vaporremoval.com

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Wall Extraction Point

A-Z Solutions, Inc - 330.915.2650 - Tony@vaporremoval.com

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Cleaning up the mess

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SLIDE 15

A-Z Solutions, Inc - 330.915.2650 - Tony@vaporremoval.com

Final PFE Results

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Final RN Levels 1.6 pCi/L

2 4 6 8 10 12 14 16 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 57 59 61 63 65 67 69 71 73 75 77 79 81 83 85 87 89 Hourly 4.0 pCi/L Average

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Conclusions

 Hourly RN data can show disconnected pathways.  PFE – More pressure is not always better. It is

usually just an energy waste.

 In hard to mitigate homes always look for:

 Initial positive pressure.  Large variations in pressure.  Gaps in PFE.  Additional entry routes.

 RN and VI can be taking different paths into a

structure.

A-Z Solutions, Inc - 330.915.2650 - Tony@vaporremoval.com

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SLIDE 18

Commercial Diagnostics

A-Z Solutions, Inc - 330.915.2650 - Tony@vaporremoval.com

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Background

 500,000 FT2 Building located in Northeast OH.  COC – TCE.  Guaranteed Maximum Project.  Funded by CORF.  Minimum -0.020” across entire area.  2 separate Mitigation Areas

 110,000 FT2 vacant area. 30 Days to Complete.  12,500 FT2 occupied area. 10 Days to Complete.

 Tight quarters.  24/7 operation. Our design could not cause downtime at the business.  No pipes allowed in this area.

 Boring logs show:

 12” of concrete.  Consistent Clay layer to 6’.  No aggregate layer.

A-Z Solutions, Inc - 330.915.2650 - Tony@vaporremoval.com

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Subject Building

A-Z Solutions, Inc - 330.915.2650 - Tony@vaporremoval.com

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You could also modify the existing SSD System…

 Original system had been running for

about 2 years.

 There were 5 of these units throughout

the building.

 4 were running when we encountered

them.

 Designed by P.E. of previous

Environmental Company.

 Negative impact on the indoor air

samples.

A-Z Solutions, Inc - 330.915.2650 - Tony@vaporremoval.com

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110,000 FT2 Section

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Diagnostics Results

Test Hole 1 Test Hole 2

A-Z Solutions, Inc - 330.915.2650 - Tony@vaporremoval.com

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Extrapolations

 50” of applied vacuum will produce:

 ~ 10 CFM .  15’ ROI @ -0.020”.  1 EP would depressurize about 700 ft2.

 Traditional system design would require approximately 142

EP and fans.

 Location of EPs would render the building unusable.

A-Z Solutions, Inc - 330.915.2650 - Tony@vaporremoval.com

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A More Efficient Way

 Installing suction

trenches would eliminate the need for multiple EP’s.

 As the trench gets

longer, the ROI gets wider, CFMs go up, and the system

  • perating pressure

gets Lower.

A-Z Solutions, Inc - 330.915.2650 - Tony@vaporremoval.com

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SLIDE 26

A-Z Solutions, Inc - 330.915.2650 - Tony@vaporremoval.com

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SLIDE 27

A-Z Solutions, Inc - 330.915.2650 - Tony@vaporremoval.com

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Fan Motors

System Fan Watts CFM Pressure 1 FKD12 530 315

  • 2.29”

2 FKD12 500 175

  • 2.89”

3 FKD12 515 325

  • 2.20”

4 FKD12 540 289

  • 2.45”

A-Z Solutions, Inc - 330.915.2650 - Tony@vaporremoval.com

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Final PFE Readings

A-Z Solutions, Inc - 330.915.2650 - Tony@vaporremoval.com

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12,500 FT2 Occupied Area

A-Z Solutions, Inc - 330.915.2650 - Tony@vaporremoval.com

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Limitations of Horizontal Boring

 Reaming causes

compaction which requires higher pressure to compensate.

 Usually does not take

advantage of subsidence.

A-Z Solutions, Inc - 330.915.2650 - Tony@vaporremoval.com

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SLIDE 32

A-Z Solutions, Inc - 330.915.2650 - Tony@vaporremoval.com

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Final PFE Readings

A-Z Solutions, Inc - 330.915.2650 - Tony@vaporremoval.com

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System Efficiency

Area 1 w Trench Area 2 w HB Area 1 w EP Total ft2 110,000 12,500 110,000 Number of Fans 4 5 142 Total System Wattage 2,085 1,375 46,860 Monthly cost at $0.10 KWH $152.22 $100.39 $3,421.15 Fan Warranty 5 Years 1 Year 1 Year Life Expectancy 10 Years 3 Years 3 Years Cost to Replace X 4X 4X FT2 Depressurized per Watt 47.9 9.1 2.13

A-Z Solutions, Inc - 330.915.2650 - Tony@vaporremoval.com

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Conclusions

 Suction Trenches are an effective Force Multiplier, but

generate large amounts of soil for disposal.

 Horizontal Borings can be an effective technology to

enhance SSD.

 Usually require the same pressure as a normal EP.  ROI becomes a cylinder around bore hole.  Does not generate soil for disposal.  Be aware of the water table.

 Systems install in 2012/13

 Trench System – No Maintenance.  Boring System – 2 Motor Replacements.

A-Z Solutions, Inc - 330.915.2650 - Tony@vaporremoval.com

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Thank You

A-Z Solutions, Inc - 330.915.2650 - Tony@vaporremoval.com