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Analytical Methods and Sampling Guidance

Provides information on TPH methods 1005 and 1006, and on Method 5035. Also provides information on sampling.

Laboratory Accreditation

As of July 1, 2008, analytical data submitted to us that is related to permitting or remediation must be generated by a lab that is accredited through the Texas Laboratory Accreditation Program under the NELAP standard for matrices, methods, and parameters of analysis, unless:

  • The lab is an in-house lab and meets one of these criteria: The lab performs work for its owner, for another company with a unit located on the same site, or without compensation for a governmental agency or charitable organization, or the lab is in another state and is accredited or inspected by that state.
  • The lab is accredited under federal law.
  • The data are needed for emergency-response activities and no TLAP-accredited lab is available.
  • The lab supplies data for which we do not offer accreditation.

Starting July 1, 2008, we will accept analytical data for a permitting or remediation decision only if the data comply with all applicable rules for the regulatory program involved and:

  • the lab generating the data is NELAP-accredited by TLAP,
  • we have approved an exception as described above, or
  • the data were generated on or before June 30, 2008.

For additional information on these requirements, see the NELAP page.

Guidance on SW-846 Method 5035

SW-846 Method 5035 was promulgated by the US EPA in June of 1997. The method describes how to collect solid samples for volatile organic analyses, such as SW-846 8260 or SW-846 8021. The TCEQ guidance on the use of EPA SW-846 Method 5035 recommends a modification to the method. That modification includes collecting the sample using an open-bore coring device and extruding the cored sample into a volatile organic analysis (VOA) vial with a polytetraflouroethylene-lined (PTFE-lined) septum seal.

The use of SW-846 Method 5035 is not required at this time unless specified by the program area. The program areas specifying the use of SW-846 Method 5035 at this time are the Superfund program and the Petroleum Storage Tank (PST) State-lead program. The TCEQ strongly recommends responsible and potentially responsible parties begin transitioning to SW-846 Method 5035 where feasible, e.g., on new projects, as the method will become mandatory for projects within the Remediation Division. As discussed in the guidance, the intended use of the data needs to be evaluated prior to implementing SW-846 Method 5035, because SW-846 Method 5035 data may not be comparable to SW-846 Method 5030 data in existing data sets.

TPH Analytical Methods

TCEQ Method 1005 - This method involves analysis of an n-pentane extraction using gas chromatography followed by flame ionization detection. The method is to be used in the analysis of total petroleum hydrocarbons (TPH) having an approximate boiling point range between nC6 to nC28, or when applicable to the project objectives, nC6 to nC35. This method is applicable to soil, groundwater, and wastes. Revisions have been made to the method. The revised method is TCEQ Method 1005, Revision 03, effective as of June 1, 2001. The method allows the project objectives to be used to modify the method. General clarification and program specific guidance is provided in the document.

TCEQ Method 1006 - This method involves an n-pentane extraction followed by fractionation using a silica gel column and analysis using gas chromatography with flame ionization detection. The method is used to determine the distribution and concentrations of hydrocarbons in the aliphatic and the aromatic fractions of total petroleum hydrocarbons between the approximate boiling point range of C6 to C35. The method is applicable to soil, groundwater, and wastes. Under the TRRP rule, data from this method are used to establish the site-specific protective concentration levels (PCLs) at an affected property. This version is dated May 1, 2000.

This draft TCEQ Method 1006 should be used until a final version is issued. Laboratories that use these methods for TPH analysis, must keep on file the quality control data that demonstrate the laboratory is capable of performing the method. The laboratory also must have on file the data used to established the laboratory's quality control limits.

If you have any questions about the methods, please contact Technical Program Support.

Sampling Issues

Refer to this guidance on Sample Handling and Preservation Procedures and the Collection Procedures for Groundwater Samples.