Order this information in Print

Order this information on CD-ROM

Download in PDF Format

     

Click here to make tpub.com your Home Page

Page Title: C.4.1 Runoff water preparation for water column toxicity test
Back | Up | Next

Click here for a printable version

Google


Web
www.tpub.com

Home


   
Information Categories
.... Administration
Advancement
Aerographer
Automotive
Aviation
Combat
Construction
Diving
Draftsman
Engineering
Electronics
Food and Cooking
Math
Medical
Music
Nuclear Fundamentals
Photography
Religion
USMC
   
Products
  Educational CD-ROM's
Printed Manuals
Downloadable Books
   

 

column at the disposal site. The recommended procedures for water column
toxicity tests for evaluation of runoff discharges are conducted in generally the
same manner as those for discharges of material into open water as described in the
Inland Testing Manual (ITM) (USEPA/USACE 1998). The only exception is that
the toxicity test medium is prepared using the SLRP or RSLS runoff procedure.
The results of the water column toxicity tests should be interpreted considering
the effects of mixing. If the concentration of dissolved plus suspended contami-
nants, after allowance for mixing, does not exceed 0.01 of the toxic (LC50 or
EC50) concentration beyond the boundaries of the mixing zone, the discharge is
predicted not to be acutely toxic to water column organisms. If the concentration of
dissolved plus suspended contaminants, after allowance for mixing, exceeds 0.01
of the toxic concentration, the discharge is predicted to be acutely toxic to water
column organisms.
C.4.1 Runoff water preparation for water column toxicity test
The volume required for each analysis, the number of variables measured, and
the desired analytical replication will influence the total runoff sample volume
required. A 4-L cylinder is normally used for the test, and the supernatant volume
available for sample extraction will vary from approximately 500 to 1,000 mL,
depending on the sediment properties, settling times, and initial concentration of
the slurry. It may be necessary to composite several extracted sample volumes or
to use large-diameter cylinders to obtain the total required volume.
C.4.2 Apparatus
The following items are required:
a. SLRP or RSLS apparatus.
b. Several 4-L glass bottles with teflon caps.
c. Clock with second hand.
C.4.3 Test procedure
Sample collection and preparation. Runoff samples for the water column
toxicity test are collected in 4-L bottles as described in the SLRP or RSLS runoff
procedures. It may be necessary to let the samples settle and the supernatant
carefully removed so that the suspension is clear enough at the first observation
time for the organisms to be visible. The general guidance in the ITM should be
followed in performing the toxicity tests.
C10
Appendix C Test Procedures for Surface Runoff Discharges

Privacy Statement - Press Release - Copyright Information. - Contact Us - Support Integrated Publishing

Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business