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Helpful Resources

Rule 36 Manual

Texas Statewide Rule 36 Hydrogen Sulfide Manual. Compliance guidance for sour gas operations in Texas.

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Rule 86 Tables

Texas Statewide Rule 86 Acreage Tables. Use this table for acreage assignment for horizontal wells.

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Water Well Map and Database

Texas Water Development Board water well map and database

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Inspection Lookup Tool

Railroad Commission’s “OIL” Online Inspection Lookup tool. Check your inspection record.

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PRS H2S Radius of Exposure


This calculator computes the 100 PPM and 500 PPM radius of exposure for a gas containing H2S using the Pasquill – Gifford Dispersion equation. This is the method approved by Texas, New Mexico, and most other agencies. The calculator provides an option to generate a PDF record of your calculated ROEs.

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PRS H2S Radius of Exposure Calculation

State and Federal Oil and Gas Resource Links