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Buffer Zones and Credits. John Leahy, EPA Pesticide Re-evaluation Division. Buffer Zones. Area around the application block or greenhouse Bystanders must be excluded during buffer zone period except when in transit

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Buffer Zones and Credits

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Buffer zones and credits

Buffer Zones and Credits

John Leahy, EPAPesticide Re-evaluation Division

Buffer zones

Buffer Zones

  • Area around the application block or greenhouse

    • Bystanders must be excluded during buffer zone period except when in transit

  • “Buffer zone period” starts when fumigant is firstdelivered to soil and is in effect for 48 hours afterapplication ends

  • Product labels will display distances in look-up tables based on rate, method and field size

  • Credits for certain site conditions or applicationpractices that reduce emissions

Buffer zone updates 2011

Buffer Zone Updates 2011

  • Will Consider New Flux Studies Including:

    • Temperature studies

    • Application method studies

    • Multi-chemical studies

  • Currently received over 20 new studies, more expected

  • EPA tarp testing

    • May result inperformance based standards

Transit through buffer zones

Transit Through Buffer Zones

Vehicular and bicycle traffic on public and private roadways through the buffer zone is permitted.

Bus stops or other locations where persons wait for public transit are not permitted within the buffer zone.

Pedestrians are not permitted within the buffer zone.


Roads and rights of ways

Roads and Rights-of-Ways

Buffers may NOT include roads and rights-of-way UNLESS,

The area is not occupied during the buffer zone period

Entry by non-handlers is prohibited

Applicators comply with all local laws and regulations


Other publicly owned and or operated areas

Other Publicly Owned and/or Operated Areas

Buffers may NOT include areas such as parks, sidewalks, permanent walking paths, playgrounds, and athletic fields UNLESS,

The area is not be occupied during buffer zone period

Entry by non-handlers is prohibited

Applicators comply with all local laws and regulations AND

Written permission to include the public area in the buffer zone is granted by the state/local authorities responsible for management and operation of the area


Buffer zone distances

Buffer Zone Distances

Product labels will display distances in look-up tables based on

application rate

field size

application equipment and methods

Buffer zone credits may be applied for certain site conditions or application practices that reduce emissions (e.g., certain tarps)


Buffer zones and credits

Chloropicrin Drip Tarped Buffer Zone Distances

Buffer zone credits

Buffer Zone Credits


Buffer zone calculator

Buffer Zone Calculator

Being developed by EPA to assist users determine buffer zone distances required by label

Optional to use

Internet accessible

Ability to save, retrieve, edit, and print records

No information will be collected by EPA

Potential to integrate into EPA’s FMP web-based FMP program


Buffer zone calculator sample screens

Buffer Zone Calculator (sample screens)


Buffer zone calculator sample screens1

Buffer Zone Calculator (sample screens)


Buffer zone calculator sample screen

Buffer Zone Calculator (sample screen)

  • Results:

  • Date and time of calculation: 3/23/2010 11:53 AM

  • Product Name: Pic-Brom Preplant Soil Fumigant

  • EPA Reg No: 8536-9

  • Active ingredients in the product that will be applied:

  • MeBr (50%) and Chloropicrin (50%)

  • Application Method: Tarped bedded

  • Application rate: 240 lbs product/acre

  • Application Block Size: 20 acres

  • Buffer Zone Credits Applied: Pliant Blockade Tarp (60% reduction)

  • Total % of reduction with credits: 60% reduction

  • Minimum buffer zone distance without credits: 323 feet

  • Minimum buffer zone distance with credits: 130 feet



Save as..



Buffer zones1

Buffer Zones

Questions and discussion


Buffer zones2

Buffer Zones

  • Extra Slides

    • Background and additional details

Recently submitted flux studies

Recently Submitted Flux Studies

Metam sodium shank and center pivot in WA (WSU)

Telone and chloropicrin shank in PNW (Dow)

Chloropicrin, 1,3-D, and metam potassium shank in FL (USDA Area-Wide)

Chloropicrin, metam sodium and DMDS shank in GA (USDA Area-Wide)

Flux Evaluation of a Metam Potassium Application Applied by the Drench Method (AMVAC)


Recently submitted flux studies cont

Recently Submitted Flux Studies (cont)

Metam sodium shank in MI (MI Growers)

Metam sodium and chloropicrin shank in WI (WI Growers)

Metam Sodium for Shank Injection/ Compaction on a Daytime and Nighttime Basis (Metam Alliance)

Chloropicrin Bedded Shank in FL (CMTF)


Recently submitted flux studies cont1

Recently Submitted Flux Studies (cont)

Methyl bromide and chloropicrin in San Joaquin Valley, CA (MBIP)

Broadcast shallow tarped under standard HDPE

Broadcast shallow tarped under VIF

Broadcast shallow tarped under VIF with potassium thiosulfate soil spray

Broadcast shallow tarped under VIF with other emissions reduction treatment

Deep, tarped strip under VIF


Expected flux studies

Expected Flux Studies

Methyl Bromide in Plant City, FL (MBIP)

Bedded tarp shank injection with VIF

Bedded tarp shank injection with VIF traditional emissions reduction treatment

Bedded tarp shank injection with metalized film

Broadcast shallow tarp under VIF

1,3-D and chloropicrin broadcast shank in a Florida sod production farm (USDA Area-wide)


Epa tarp permeability testing

EPA Tarp Permeability Testing

EPA is testing several tarps determine mass transfer coefficient (MTC) for 1,3-D,MeBr, MeI, MITC, chloropicrin, DMDS, sulfuryl fluoride, and PPO

MTC data may result in additional/revised buffer zone credits for 2011 labels

Potential basis for development performance based credits (in lieu credits for specific tarp names) with a standard tarp testing protocol


Tarps received by epa

Tarps Received by EPA

AEP, Sun Film High Barrier


Berry Plastic, EVOH-High Barrier

Berry Plastic, EVOH-High Barrier/improved toughness

Berry Plastic, EVOH-Supreme Barrier

Cadillac VIF - 1.25 mil

Cadillac, HDPE

Canslit Metallic - 1.25 mil, Black

Canslit Metallic - 1.25 mil, White

Canslit, Embossed HDPE, 0.6 ml

Canslit, Embossed LDPE, 1.25 ml



FilmTec VIF - 1.25 mil

Ginegar, Ozgard - 1.25 mil

Ginegar VIF - 1.25 mil

Guardian Olefinas VIF - Black 1.2 mil, Embossed

Mid South VIF - 1.25 mil

Pliant, Embossed Polyethylene Film

Pliant, Blockade Black - 1.25 mil

Pliant, Blockade White on Black - 1.25 mil

Pliant, Metalized - 1.0 - 1.25 mil

Raven TIF “VaporSafeTM” 1 mil with EVOH core

Raven TIF “VaporSafeTM” 1.4 mil LDPE with EVOH core


Expected tarps

Expected Tarps

Bromostop VIF - 1.30 mil

Bruno Rimini IPM Clear VIF 1.38

Klerk Hytibar VIF - 1.30 mil


Buffers and agricultural areas

Buffers and Agricultural Areas

Buffer zones may include agricultural areas owned/operated by someone other than the owner/operator of the application block IF

The buffer zone will not overlap with a buffer zone from a nearby fumigation, and

The owner/operator provides written agreement that they, their employees, and others will stay out of the buffer zone.


Buffers and residential areas

Buffers and Residential Areas

Buffer zones may include residential areas IF

The occupants provide written agreement to voluntarily vacate the buffer zone during the entire buffer zone period

For applications of methyl bromide products with less than 20 percent chloropicrin, air monitoring inside residential structures is required after the buffer zone period ends


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