| (a) The permittee shall take soil samples within the
same 45-day time frame each calendar year.
(b) Laboratory analyses of the soil samples must be
submitted to the executive director by September 1 following the sampling
date.
(c) The plant nutrient parameters shall be analyzed
on a plant available basis. The permittee shall provide annual soil
analyses of the dispersal zones for the following substances:
(1) pH (sample consisting of two volumes of water to
one volume of soil mixture), in standard units;
(2) conductivity (sample consisting of two volumes
of water to one volume of soil mixture), reported in millimho per
centimeter;
(3) total Kjeldahl nitrogen. Methods that rely on mercury
as a catalyst are not acceptable;
(4) nitrate-nitrogen;
(5) plant-available potassium, reported on a dry-weight
basis in milligrams per kilogram (mg/kg);
(6) calcium, reported on a dry-weight basis in mg/kg;
(7) magnesium, reported on a dry-weight basis in mg/kg;
(8) sulfur, reported on a dry-weight basis in mg/kg;
(9) phosphorus, analyzed according to the Mehlich III
procedure (the North American Proficiency Testing Program of the Soil
Science Society of America) and reported on a dry-weight basis in
mg/kg;
(10) sodium, reported on a dry-weight basis in mg/kg;
(11) salinity; and
(12) trace elements as specified in the individual
permit.
(d) The permittee shall take samples in:
(1) the zero to 12-inch zone of the soil; and
(2) the 12- to 24-inch zone of soil in the disposal
area.
(e) If soil conditions or weather preclude sampling
within the time period required, the permittee may submit a request
to sample at another time. The request must include justification
for the schedule change and the replacement schedule.
(f) Alternate soil sampling depths and frequency may
be approved by the executive director if the permittee demonstrates
that the alternate depths and frequency sufficiently monitors nutrient
levels.
(g) The permittee shall collect soil composite samples
from each broadly defined soil characterization or texture, as defined
by the United States Department of Agriculture.
(h) The permittee shall take at least one composite
soil sample from each dispersal zone.
(i) The permittee must comply with any alternate sampling
methods or schedules required by the executive director.
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