Document B5VQG5jobRg46nEQzwzGBXYVk
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: . Monsanto
. E<wme.loct.oh, e. Stewaivic^, Kri ummrich
COMPANY CONFIDENTIAL
DATE SUBJECT
: :
December 7, 1971 PCB CONTROL
cc A. E. Leisy
*
H. J. Horner
R. M. McCutchan
REFERENCE
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TO :
Mr. W. C. Engman
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Starting with the 11/5 series of sewer samples and
continuing throughout the month of November, there
appeared in our sewer streams a lower chlorinated
biphenyl. At present the material is called 1221.
It may be primarily a monochlorinated compound, and
whether this should be considered as a PCB has yet
to be resolved.
. '
However, the presence of 1221 may give us a clue to the source of PCB that is present in our sewer system.
Data on the amount of the various Aroclors are tabulated
below:
Approx.
1221
1242 -48 1254 -60 Flow
%. PPft 1L ppb GPM
Dept. 246 (4-z) 65 375 25 144 10 58 240
24" Sewer (2-A) 20
9 64
30" Sewer (1-B) 80 182 12
29 16
7 4000
27 8 as' 39^0
Influent
57 217 30 114 13 50 8650
Effluent
64 159 26
64 11 27 8650
1. Note that Dept. 246 flow is primarily through the 30" sewer and not the 24" sewer we believe. There must be a cross flow occurring.
2. These data would indicate that most of our losses are coming from the department.
3. `Either there are discrepancies in our sampling procedures or there are major cross flows between the sewer system and the underground water system.
x
DSW 296243
IN.1A
STLCOPCB4066187
//
Mr. W. C. Engman PCB CONTROL
Page 2 12/7/71 WGK
Future Plans:
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1. A work request has been given AR&D to characterize the reported 1221. Try to identify if it is mono or
polychlorinated. I have asked Harry Campbell to review past chromatographs to determine if "1221" were present during six specific periods prior to 11/3. Each period
corresponds to different times when 1016, 1105 and 1109 were produced.
2. Plans are being made to divert the entire sewer water from Dept. 246 to the North and flow to the treatment plant via Monsanto Avenue rather than thru the 24 and 30 inch sewers in the plant. This will permit us to note changes
when the entire department flow is diverted from the other plant sewers.
3. Flow measurements from the 24" and 30" sewers are being
recalculated from LiCl tests to be conducted week of 12/6. Additional checking for cross flow will be made. This work is being done primarily to study mercury data.
4. A Parshall flume and isokinetic sampling station will be ' Installed during the forthcoming major sewer repair project along Second Street.
Edward E. Stewart Technical Services Department
/tm
DSW 296244 STLCOPCB4066188
STLCOPCB4066189
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