| (a) Water Supply. For a lagoon constructed on or after
the effective date of this subchapter, the initial fill water and
make-up water shall come from a public water system as defined by
30 TAC §290.38 (relating to Definitions) or from a well that
complies with the requirements of subsection (c) of this section.
(b) Water distribution system. All portions of the
water distribution system shall be protected against backflow and
back siphonage using a high hazard preventer such as a reduced-pressure-principle
backflow preventer meeting the requirements of the American Society
of Sanitary Engineering Standard 1013 2013, as amended, and approved
for use in potable water systems possibly subjected to back siphonage
or high back pressure or an air gap designed to ASME Standard A112.1.2.
(c) Private water supply. If the water supply providing
water to the lagoon does not meet the definition of a public water
system, that water supply shall comply with the following requirements.
(1) Water supply system. The water supply system shall:
(A) be designed to maintain a minimum pressure of 35
pounds per square inch (psi) at all points within the distribution
network at flow rates of at least 1.5 gallons per minute per connection;
(B) be designed to maintain a minimum pressure of 20
psi under combined fire and drinking water flow conditions when the
system is intended to provide firefighting capability; and
(C) maintain a minimum distribution pressure not be
less than 20 psi at any time.
(2) Bacteriological properties. Coliform testing of
the well water shall be performed each month the lagoon is open for
use. Records of bacteriological tests of the well water shall be kept
on-site for three years and made available during inspection.
(3) Chemical properties.
(A) Water samples for chemical analysis obtained from
the entry point to the distribution system shall be submitted to a
laboratory certified by TCEQ once every three years.
(B) The chemical analysis shall be for secondary constituent
levels as set out by 30 TAC §290.118 (relating to Secondary Constituent
Levels) excluding, for saline lagoons, Total Dissolved Solids.
(C) Records of all chemical testing shall be kept on
site for three years and made available during inspection.
(d) Hose bibs. Hose bibs shall be protected with a
vacuum breaker.
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