Section 329IAC10-24-3. Soils, ground water, geology information; certified

   An application for restricted waste site Type I or Type II or nonmunicipal solid waste landfill must be accompanied by the following information on soils, ground water, and geology, and be certified by a registered professional engineer or certified professional geologist, either of whom shall have education or professional experience in hydrogeology or ground water hydrology:

(1) The number and location of soil borings completed at the site must be indicated as follows:

(A) There must be at least one (1) boring for every five (5) acres of fill area up to one hundred (100) acres and one (1) boring for every ten (10) acres of fill area beyond one hundred (100) acres, with a minimum of five (5) borings at any site. The borings must be evenly distributed over the site.

(B) Borings must be completed to a depth necessary to indicate compliance with the design standards of 329 IAC 10-26, with a minimum depth of twenty (20) feet below the depth of waste placement or to bedrock, whichever is shallower.

(C) At least one (1) of the required borings in clause (A) for sites less than ten (10) acres and at least two (2) borings for sites greater than ten (10) acres must be completed to a depth of at least seventy (70) feet below the depth of waste placement, or at least twenty (20) feet into the bedrock, whichever is shallower. The deep borings, where two (2) are required, must be evenly distributed over the site.

(D) Additional borings, meeting other requirements, may be required to delineate the boundaries of any features pertinent to the site design.

(E) The commissioner may vary the minimum requirements where alternate testing provides comparable information.

(F) The commissioner may require prior notification of the date and time of soil borings.

(2) Boring logs must include the following:

(A) The date of drilling.

(B) The method of drilling.

(C) The method of backfilling and sealing of the borehole.

(D) Textural classification.

(E) The descriptions for:

(i) the entire depth of the boring;

(ii) the depths to and thickness of any water bearing zones; and

(iii) the static water levels immediately following the boring.

The mean sea level surface elevation at each boring must be recorded and submitted with the boring log. The textural classification system utilized must be identified. The commissioner may establish guidance on the recommended sample descriptions to be utilized.

(3) The following testing requirements must apply to the minimum number of borings required under subdivision (1):

(A) Split spoon samples of the unconsolidated material must be taken at an interval of one (1) per two and five-tenths (2.5) feet unless the commissioner otherwise authorizes, based on uniformity of geologic conditions at the site.

(B) For at least three (3) evenly distributed borings, including one (1) of the deep borings required under subdivision (1), split spoon samples of the unconsolidated material must be taken on a continuous basis.

(C) For the deep borings required under subdivision (1), continuous core samples must be taken of any bedrock encountered.

(D) A complete grain size analysis, including Atterberg limits, must be performed on a representative sample from each significant stratum encountered. A significant stratum must be defined as a soil layer with a minimum thickness of eighteen (18) inches which, based on appearance (color and texture), can be visually distinguished from other layers. More than one (1) stratum may be represented by a single grain size analysis and Atterberg limits test where alternating strata of approximately identical color and texture are encountered. At least one (1) grain size analysis and Atterberg limits test must be performed for each of the required minimum number of borings.

(E) Hydraulic conductivity tests must be conducted on each of the required minimum number of borings at a depth of approximately five (5) feet below the proposed base of waste placement.

(F) Cation exchange capacity (CEC) and additional hydraulic conductivity tests must be conducted as necessary to characterize the major strata proposed for use as base and sidewall barriers or cover material.

(G) Hydraulic conductivity sampling must occur by a combination of in situ field tests and laboratory permeability tests on undisturbed Shelby tube samples. CEC must be determined according to the ammonium saturation method specified in Part 2 of "Methods of Soil Analysis" published by the American Society of Agronomy in 1965.

(H) Other tests may be required by the commissioner to further evaluate soil suitability. The commissioner may vary the preceding minimum requirements where alternate testing methods provide comparable information.

(I) All testing and sampling procedures must be identified, and all results must be identified with respect to boring and depth.

(4) Boring samples must be collected and maintained until the solid waste land disposal facility permit is issued, or until any litigation with regard to the proposed permit is resolved, whichever is later.

(5) Borings completed for the purpose of satisfying this section may be converted to piezometers or cased holes to comply with the requirements of section 4 of this rule.

(Solid Waste Management Division; 329 IAC 10-24-3; filed Mar 14, 1996, 5:00 p.m.: 19 IR 1889; readopted filed Jan 10, 2001, 3:25 p.m.: 24 IR 1535; readopted filed May 14, 2007, 1:53 p.m.: 20070523-IR-329070138BFA; readopted filed Jul 29, 2013, 9:20 a.m.: 20130828-IR-329130179BFA)