A beneficial use designation in which the waterbody provides
suitable habitat for survival and reproduction of desirable
fish, shellfish, and other aquatic organisms.
Refers to water body type as indicated in MDNR's PWI. PWI
serves to document all public waters (lakes and wetlands) and
assign individual ID numbers. (consistent with Bulletin 25).
However some lakes in Bulletin 25 are really protected wetlands
and are coded as "W" whereas protected lakes have the codes
"P" or "L" in the
PWI. Lakes that are "wetlands" based on the PWI were
not
assessed for the 303(d) list, however this differentiation was
<p>The concentration of molecular oxygen (O2) dissolved in
water, usually expressed in milligrams per liter (mg/L), parts
per million, or percent of saturation. The DO level represents
one of the most important measurements of water quality and is a
critical indicator of a water body's ability to support healthy
ecosystems. Levels above 5 mg/L are considered optimal, and
most fish cannot survive for prolonged periods at levels below
3 mg/L.</p>
Perfluorochemicals (PFCs) are a family of manmade chemicals
that have been used for decades to make products that resist
heat, oil, stains, grease, and water. Common uses include
nonstick cookware, stain-resistant carpets and fabrics, as
components of fire-fighting foam, and other industrial
applications.
CAS Number: 7439-92-1. A bluish-white, soft, heavy, metallic
element found mostly in combination with other metals, and used
especially in pipes, cable sheaths, batteries, solder, and
shields against radioactivity. Chemical symbol = Pb. Molecular
weight = 207.2 g/mol.
an inorganic form of nitrogen, is contained in fertilizers,
septic system effluent,
and animal wastes. It is also a product of bacterial
decomposition of organic
matter. Ammonia NH3-N (NH3-N) becomes a concern if high levels
of the un-ionized form are
present. In this form NH3-N can be toxic to aquatic organisms.
The presence of
un-ionized ammonia is a function of the NH3-N concentration,
pH, and
temperature. Conversion of NH3-N to nitrite nitrogen by
nitrification requires
Any lake with total phosphorus (TP), chlorophyll-a, or Secchi
transparency data collected between 1970-1998, and stored under
MPCA's agency code 21 MINNL in STORET is included in this
assessment. Lakes were classified into one of two categories for
this data assessment. "M" implies monitored (recent) and
indicates that summer (June through September) data collected
between 1989 and 1998 was available for that lake. "E" implies
evaluated (old). This indicates that data for this lake was