Erosion and Sediment Pollution Control Program Manual.pdf

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RECOMMENDED PROCESS FOR SITES WITH REGULATED SUBSTANCES
Note: It is the responsibility of the applicant, not the NPDES Permitting program, to ensure that proper procedures are followed.
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Complete NPDES Permit
Application Received
Check each regulated substance listed
in Application
FOR EACH REGULATED SUBSTANCE
(pollutant) LISTED, does substance
exceed the Soil to Groundwater Pathway
thresholds? Follow Note A
Blend
substance
with
surrounding
soils
Blending is used for
orchards and
agricultural sites
(pesticide related).
Sequence of
construction, plan, and
details must address
blending of contaminant
AND follow Note D
Cover substance
with fill or
pavement,
or do nothing.
Follow Notes D
and H; No
Does substance exceed
the Direct Contact
(human exposure -
ingestion/ inhalation)
thresholds?
Follow Notes B and H
Yes
Follow Note F
Infiltration is acceptable
based on this known
concentration of this
substance
What type of remediation
is being proposed?
Yes
No
Yes or
N/A
Follow Note G
FLOW CHART A
Encapsulate
substance
following
appropriate
federal, state and
local requirements
Completely haul
substance off-site
Completely move a
regulated substance
from a cut excavation
area to an on-site
proposed designated
area (in a fill excavation
area); This allows
future disclosures of
the site to have
continuity; Follow Note
G; Sequence of
construction and E&S
plan must address the
remediation plan; AND
follow Note D
Do horizontal
and vertical limits
of capping*
completely
enclose
substance?
If infiltration is proposed, has
contaminant passed Synthetic
Precipitation Leaching Procedures
(SPLP) test per Title 25 Chapter
250 Section 308? See Note C
Z
Does substance
exceed the
Direct Contact
(human exposure -
ingestion/inhalation)
thresholds?
Follow Note B
Yes
Substance is not a concern per
applicant's due diligence; AND
follow Notes D and H;
Is proposed
redevelopment
Residential?
(check definition
in Chapter 250)
Follow Notes
F and H
363-2134-008 / March 31, 2012 / Page 335
Yes
No
No
No
Z
Yes
Follow Note G;
Also, follow Note E;
Sequence of construction and
details must address
excavation, hauling of
contaminant, and trenching
around staging stockpile to
sump to be pumped and
hauled; also excavator bucket
wash area should be protected
Follow Note G;
Ensure proposed
redevelopment foundations
and utilities do not impact
the limits of the capping*.
Sequence of construction and
details must address capping
of contaminant
*Capping – impermeable soils or
synthetic membrane liner.
Infiltration is discouraged in
areas of regulated substance
including a reasonable buffer
area around the known
location. Seek other
alternatives. Refer to Ch.
250.308 subsection (b) or (d)
OR completely haul
contaminant off-site OR nonuse
aquifer determination is
granted. (check with ECP)
Requires at least 2 feet of fill
(or pavement) between
proposed grade and
contaminant. Also, direct
contact with contaminated soil
should also be avoided during
construction. Sequence of
construction and plans must
address placement of fill or
pavement, and health and
safety of construction workers;
AND follow Notes D and H;
Requires at least 15 feet of fill
between proposed grade and
contaminant. Also, direct
contact with contaminated soil
should also be avoided during
construction. Sequence of
construction and plans must
address placement of fill or
pavement, and health and
safety of construction workers;
AND follow Note D and H;
Z
Z
Z