R311-205-2. Site Assessment Protocol

  (a) General Requirements.

  (1) When a site assessment or site check is required, pursuant to 40 CFR 280 or Subsection 19-6-428(3), owners or operators shall perform or commission to be performed a site assessment or a site check according to the protocol outlined in Rule R311-205 or equivalent, as approved by the Director. Additional environmental samples must be collected when contamination is found, suspected, or as requested by the Director.

  (2) This Subsection incorporates by reference the documents referenced in Subsections R311-205-2(a)(2)(A) through (C). These documents contain guidance and methodologies for collecting soil and groundwater samples.

  (A) Groundwater samples shall be collected in accordance with "RCRA Ground-Water Monitoring Technical Enforcement Guidance Document" (OSWER Directive 9950.1), published by EPA and dated September 1986, or as determined by the Director.

  (B) Surface water samples shall be collected in accordance with protocol established in "Compendium of ERT Surface Water and Sediment Sampling Procedures", published by EPA and dated January 1991, or as determined by the Director.

  (C) Soil samples shall be collected in accordance with "Description and Sampling of Contaminated Soils, A Field Pocket Guide", published by EPA and dated November 1991, or as determined by the Director.

  (3) Owners and operators must document and report to the Director sample types, sample locations and depths, field and sampling measurement methods, the nature of the stored substance, the type of backfill and native soil, the depth to groundwater, and other factors appropriate for identifying the source area and the degree and extent of subsurface soil and groundwater contamination.

  (4) The owner or operator shall report the discovery of any release or suspected release to the Director within twenty-four hours. Owners or operators shall begin release investigation and confirmation steps in accordance with 40 CFR 280, Subpart E upon suspecting a release. Owners or operators shall begin release response and corrective action in accordance with 40 CFR 280, Subpart F upon confirming a release.

  (5) All environmental samples shall be collected by a certified groundwater and soil sampler who meets the requirements of Rule R311-201. The certified groundwater and soil sampler shall record the depth below grade and location of each sample collected to within one foot.

  (6) All environmental samples shall be analyzed within the time frame allowed, in accordance with Table 4.1 of "RCRA Ground-Water Monitoring Technical Enforcement Guidance Document" (OSWER Directive 9950.1), by a Certified Environmental Laboratory. Soil samples must be corrected for moisture, if necessary, with percent moisture reported to accurately represent the level of contamination.

  (7) Environmental samples for UST permanent closure or change in service shall be collected according to the protocol outlined in Subsection R311-205-2(b), after the UST system is emptied and cleaned and after the closure plan has been approved.

  (8) Environmental confirmation samples are required following overexcavation of soils. Confirmation samples shall be taken at locations and depths sufficient to detect the presence, extent and degree of a release from any portion of the UST in accordance with 40 CFR 280, Subparts E, F and G. Additional confirmation samples may be required as determined by the Director.

  (9) Upon confirming a release, a site assessment report, an updated site plat, analytical laboratory results, chain of custody forms, and all other applicable documentation required by 40 CFR 280, Subparts E and F, following any abatement, investigation or assessment, monitoring, remediation or corrective action activities, shall be submitted to the Director within the specified time frames as outlined in compliance schedules.

  (10) When conducting environmental sampling to satisfy the requirements of 40 CFR 280, subparts E and F, soil classification samples to determine native soil type shall be collected at locations and depths as outlined in compliance schedules, or as determined by the Director. Techniques of the Unified Soil Classification such as a sieve analysis or laboratory classification, or a field description from a qualified individual as determined by the Director, may be used to satisfy requirements of determining native soil type.

  (11) Other types of environmental or quality assurance samples may be required as determined by the Director.

  (b) Site Assessment Protocol for UST Closure.

  (1) The appropriate number of environmental samples, as described in Subsection R311-205-2(b)(4) shall be collected in native soils, below the backfill material, and as close as technically feasible to the tank, piping or dispenser island. Any other samples required by Subsection R311-205-2(a) must also be collected. Soil samples shall be collected from a depth of zero to two feet below the backfill and native soil interface. If groundwater is contacted in the process of collecting the soil samples, the soil samples required by Subsection R311-205-2(b)(4) shall be collected from the unsaturated zone immediately above the capillary fringe. Groundwater samples shall be collected using proper surface water collection techniques, from a properly installed groundwater monitoring well, or as determined by the Director. All environmental samples shall be analyzed using the appropriate analytical methods outlined in Subsection R311-205-2(d).

  (2) One soil classification sample to determine native soil type shall be collected at the same depth as indicated for environmental samples, at each tank and product piping area. For all dispenser islands, only one representative sample to determine native soil type is required. Techniques of the Unified Soil Classification such as a sieve analysis or laboratory classification shall be used to satisfy requirements of determining native soil type when taking samples for UST closure.

  (3) For purposes of complying with Rule R311-205, for tanks or piping to be removed, closed in-place or that undergo a change in service, a tank or product piping area is considered to be an excavation zone or equivalent volume of material containing one, or more than one immediately adjacent, UST or piping run.

  (4) Environmental Sampling Protocol for UST closures:

  (A) For a tank area containing one UST, one soil sample shall be collected at each end of the tank. If groundwater is contacted during the process of collecting soil samples, a minimum of one groundwater and one soil sample shall be collected from each end of the tank.

  (B) For a tank area containing more than one UST, one soil sample shall be collected from each corner of the tank area. If groundwater is contacted during the process of collecting soil samples, a minimum of one groundwater and one soil sample shall be collected from each end of the tank area.

  (C) Product piping samples shall be collected from each product piping area, at locations where leaking is most likely to occur, such as joints, connections and fittings, at intervals which do not allow more than 50 linear feet of piping in a single piping area to go unsampled. If groundwater is contacted during the process of collecting soil samples, a minimum of one groundwater and one soil sample shall be collected from each piping area where groundwater was encountered.

  (D) For dispenser islands, environmental samples shall be collected from the middle of each dispenser island. Additional environmental samples shall be collected at intervals which do not allow more than 25 linear feet of dispenser island piping to go unsampled. If groundwater is contacted during the process of collecting soil samples, a minimum of one groundwater and one soil sample shall be collected from each dispenser island where groundwater was encountered.

  (c) Site Check Requirements for Re-applying to Participate in the Petroleum Storage Tank Trust Fund Program.

  (1) Owners or operators wishing to re-apply for participation in the Petroleum Storage Tank Trust Fund Program following a period of lapse or non-participation shall perform a tank tightness test and site check pursuant to Subsection 19-6-428(3)(a). The tank tightness test and site check shall be consistent with requirements for testing and site assessment as defined under 40 CFR 280, Subparts D and E.

  (2) The owner or operator shall develop or commission to have developed a site check plan outlining the intended sampling program. The Director shall review and approve the site check plan prior to its implementation. The site check shall meet the sampling requirements for USTs, dispensers and piping as defined in Subsection R311-205-2(b), or as determined by the Director on a site-specific basis. Additional sampling may be required by the Director based on review of the proposed site check plan and site specific conditions.

  (d) Laboratory Analyses of Environmental Samples.

  (1) Environmental samples which have been collected to determine levels of contamination from underground storage tanks shall be analyzed by a Certified Environmental Laboratory. Unless otherwise approved by the Director, the required analytes and corresponding analytical methods shall be:

  (A) Gasoline contamination-

  (i) total petroleum hydrocarbons (purgeable TPH as gasoline range organics C₆ - C₁₀) by either EPA 8015 or EPA 8260; and

  (ii) benzene, toluene, ethylbenzene, xylenes, naphthalene (BTEXN), and methyl tertiary butyl ether (MTBE) by either EPA 8021 or EPA 8260.

  (B) Diesel fuel contamination-

  (i) total petroleum hydrocarbons (extractable TPH as diesel range organics C₁₀ - C₂₈) by EPA 8015; and

  (ii) benzene, toluene, ethylbenzene, xylenes and naphthalene (BTEXN) by either EPA 8021 or EPA 8260.

  (C) Used oil contamination-

  (i) oil and grease (O and G) or total recoverable petroleum hydrocarbons (TRPH) by EPA 1664; and

  (ii) benzene, toluene, ethylbenzene, xylenes, naphthalene (BTEXN), methyl tertiary butyl ether (MTBE), and halogenated volatile organic compounds (VOX) by EPA 8021 or EPA 8260.

  (D) New oil contamination- oil and grease (O and G) or total recoverable petroleum hydrocarbons (TRPH) by EPA 1664.

  (E) Contamination from underground storage tanks which contain substances other than or in addition to petroleum shall be analyzed for appropriate constituents as determined by the Director.

  (F) Contamination for an unknown petroleum product type-

  (i) total petroleum hydrocarbons (purgeable TPH as gasoline range organics C₆ - C₁₀) by either EPA 8015 or EPA 8260;

  (ii) total petroleum hydrocarbons (extractable TPH as diesel range organics C₁₀ - C₂₈) by EPA 8015;

  (iii) oil and grease (O and G) or total recoverable petroleum hydrocarbons (TRPH) by EPA 1664; and

  (iv) benzene, toluene, ethylbenzene, xylenes, naphthalene (BTEXN), methyl tertiary butyl ether (MTBE), and halogenated volatile organic compounds (VOX) by either EPA 8021 or EPA 8260.

  (2) All original laboratory sample results must be returned to the certified groundwater and soil sampler or certified UST consultant to verify all chain of custody protocols, including holding times and analytical procedures, were properly followed. Environmental samples shall be collected and transported under chain of custody according to EPA methods as approved by the Director.

  (3) Reporting limits used by laboratories analyzing environmental samples taken under this rule shall be below initial screening levels for the contaminated media under study. Environmental samples shall be analyzed with the least possible dilution to ensure reporting limits are below initial screening levels to the extent possible. If more than one determinative analysis is performed on any given environmental sample, the final dilution factor used and the reporting limit must be reported by the laboratory. As an alternative to diluting environmental samples, the laboratory shall consider using appropriate analytical cleanup methods and describe which analytical cleanup methods were used to eliminate or minimize matrix interference. Any analytical cleanup method used must not eliminate the contaminant of concern or target analyte.