sr-072380INFORMATION
Santa Monica, California July 23, 1980
To
From
Subject
Mayor and City Council
City Staff
Progress Report on Monitoring of TCE in Vdater System
Introduction
This report provides information relating to the monitoring of TCE in the
water system for the period from May 1980 until the present time. This
report will also provide information on certain actions that the staff has
taken to reduce the amount of TCE in the system.
Background
On April l4, the City Council took action to request the staff to take a
number of measures to control and reduce the levels of TCE in the water system.
(Item 11-C). Those items included: engaging a consultant to monitor industries
using TCE, appropriation of $50,000 to engage consultants to take borings and
try to discover the source of the contamination, and to re-open well Number 3
and to perform monitoring to determine the levels of TCE at various points in
the system.
Progress which has been made to date includes action on all three aspects of
the approved course of action. Dr. Herbert Conrad of Ecological Systems, Inc.,
Santa Plonica, was engaged to monitor the industries using TCE and is
approximately 60% completed. It is anticipated that it will be completed
and a report will be ready for presentation to Council within the next 60 days.
The engaging of a consultant to try to discover the sources of the contamin-
ation is ready to be submitted to the Council for consultant selection in
To: Mayor and City Council -2- July 23, 1980
August. An RFP was distributed to a number of cons u7tants and proposals
have been received and evaluated. The staff is ready to recommend a
consultant, together with a proposed detailed course of action.
Progress on the monitoring and testing of the water at various points in the
system has been accomplished in accordance with the testing schedule recommended
by the State Health Department and approved by the City Council. This
schedule included monitoring (testing) daily .for the first two weeks, and
weekly for the following two weeks, bi-weekly for three months, monthly for
three months, and quarterly thereafter. The detailed results of the testing
are attached to this report for reference. Also attached are graphs showing
how the TCE levels varied in the water distributed to the customers. The
TCE levels in the water distributed to the customers have varied from 0.6 to
4.7 parts per million during the period from May until the present time.
The TCE levels were generally below 2.0 during the month of May, but increased
to a maximum of 4.7 in the system during the month of June. Because the
levels appeared to be approaching 5.0, the limit suggested by the City Council,
the staff took immediate steps in June to introduce increased aeration at the
Arcadia Treatment Plant. The amount of aeration eras approximately doubled by
the installation of a dual blower and piping system. Since this installation,
the TCE levels have been significantly reduced and the latest test, dated
July 17, 1980 for water sampled on July 2, 1980, shows that the TCE levels in
the system are 0.6 parts per billion.
Because of the fact that levels of TCE have been controlled and are presently
significantly less .than the Maximum Concentration Limit (MCL), the aeration
and blending operations appear to be successful and appear to be meeting the
To: Mayor and City Council -3-
policy guidelines established on April 14, 1980.
July 23, 1980
The staff proposes to continue the monitoring program as approved by the
City Council in April and to take action to continue to control the TCE
levels by using one or more of the following methods:
1. If TCE levels begin to approach the MCL, increased aeration
will be used.
2. Limit the number of hours per day of operation of Wells
Number 2 and 3.
Prepared by: Stan Scholl
Jack Hoagland
Attachments: Test Results -- July 17, 1980
Memo Summarizing Test Results -- July 10, 1980
Memo Summarizing Test Results -- May 28, 1980
Graph showing TCE levels in wells versus levels to consumers
Graph showing total trihalomethanes in each pressure zone
T
Prepared FOr city of Sant.; ffenica
12,2 S. Mundy iar^,
!_os Y'lnyeies, Cri 9L'(:2S
Attn: Jack C-!ea~}and
Date
Job No.
>L
P.O. No. Date Received
1-3i?.37 Jury ~, 7S3C;
Description of Samples
17605 Fabrica Way
Cerritos, California 90701
2131921-9831
.'714/523-9200
Tf-:reE ;eater s~rrples (?n c?upiicate) labeled 529, rr34, anc' Sat.
TF.e z.Eove sa Y:p les +.+Jere extracted into iscectane ar.d analyzed for ir1-
chlcroathylene (TC~} e^, a gas chror. atograph equiFped v~ith an electron
capture ^etecior.
Tha results are listed hefovr:
Sample TCE()IC~fL}
F29 ;~2
~,G ~j~G _
.~[
X37 -
E • ~ ~ r9 : '-~ 5 T
We would appreciate a telephone call it you have any questions regarding this report. Page 1 of ~ pages.
I certify that this report truly represents the findings of work
performed by me, or under my direct supervision.
.~-> ,~
c~ r:rac clezt
Staff C'r~Ft•ist
Reviewed & Approved.
G. J. h:crthirg:cn, Ft-i.u.
TecFxtical uirecwr
This report pertains only to the samples investfgatetl and does not necessarily apply to other apparently itlentical or similar materials. THIS report is submitted /or the
exclusive use of the client to whom it is addressed. Any reproduction of this report or use of this Laboratory's name for atlvertising or publicity purposes without
written authorization is prohiDitetl.
,~
DATE: July 10, 1980
T0: Ed Lash
FRODi: J: Hoagland
CITY OF SANTA MONICA
SUBJECT: TCE MONITORING PROGRAM ANALYSIS REPORT
S,1[dL # DATE LOCATION TCE (oob)
419 5-21 14th & Olympic Sampler 1.8
4"22 5-21 Arcadia Reservoir Effluent 1.7
423 5-21 Santa Monica Well #2 6.9
424 5-21 Santa Monica 4Je11 #3 14.7
425 5-21 Salt Water Line @ Arcadia 1.6
441 5-28 Santa Monica 4Jell #2 6.6
442 5-28 Santa Monica [Jell #3 23.3
443 5-28 Main St. Sampler 3.7
444 5-28 Arcadia Reservoir Effluent 3.2
478 6-4 14th & Olympic Sampler 4.7
479 6-4 Santa Monica [Jell #2 6.4
480 6-4 Santa Monica Well #3 31.0
481 6-4 Arcadia Reservoir Effluent 4.6
521 6-11 Main Street Sampler - 3.5
524 6-11 Santa Monica Well #2 7.8
525 6-11 -Santa Monica 4Je11 #3 29.0
526 6-11 Arcadia Reservoir Effluent 3.8
563 6-18 Santa F4onica 41e7 i #3 33.0
564 6-78 14th & Olympic Sampler 3.1
566 6-18 Santa Monica Well #5 N.D. (< 0.1)
Discussion:
Santa Monica lJell #3 shows a relatively sharp increase in TCE levels'fron} the
7.3 ppb values during the first two weeks of operation to the apparent
"steady-state" level of approximately 30. parts per billion.
Santa Monica #2 shows stability at approximately 7.0 ppb.
CITY OF SAP~iTA MC3NiCA
~~~~~ ~ ~~
DATE:May 28, 1980
TO: Mr. Ed Lash; Enterprises Manager
FROIS: Jack Hoagland, Gdater Chemist `
SUBJECT: TCE :lonitor.ing Program: First Twa Gdee~s Report
Following are the results of the TCE l>oni_toring program-for the
days May 7, 19$0, to clay 20, 1980, iriclusi_t:u. ThQsA samples were
sampled by the Water CheLaist and analysed by thg State Departme~it
of Health Services,
P,esults are in parts per billion Trickiorc~~c-t,iyler~e
Sivl~~2 is Santa Monica [dell '=2
Srl~r3 is Santa *lonica We 11 ~3
Arc, Res. is Arcadia Reservoir EffluenC to tlc- 2`~0 foct ~,orie and
represents the ma_~~um amount of TCE that a consumer might receive,.
DATA.' Ski.=2 SM~~3 " AF.C.RES
5-7-80 7.8 6.5 0.1.8
5-8 7.0 7.6 1,6
5-9 7.5 6.5 1,7
5-10 7.5 7.5 1,.5
5-11 7.1 8.2 1.8
5-12 7.3 8,3 ~:,.7 -
5-13 7.1 8,4 1,6
5-14 7.9 8,7. 1.8
5-15 7,6 7.6 1,7
5-l0' 7.3 8.1 1.7
5-17 7:4 7.7 1,7
5-18 7,6 8,9 1.7
5-i9 7.2 10.0 1,8
5-20 6.0 7.6 0,80
These analyses v,ere done only by the State and we have no cross
check of their accuracy. _
Currently wee'.{Iy samples are being analysed by an outside LaYi,.
~oith results expected by Jnne 2, 1980,
RECEIVED BY 4
CONSUMERS IN
THE 250 ff. 3
PRESSURE ZONE
2
0 ~
5-7
- 5-20 5-28 6•I 6-4 -'6-II ' 6-18
DATE
7-I 7.2
COMPARISON OF TTNM AND TCE CONCENTRATIONS
IN SANTA MONICA PRESSURE ZONES
Parts per billion
TCE = Trichloroethylene TTHM = Total Trihalomethanes
* from April 17, 1980
23/80
"250 foot * 350 foot * 500 foot
zone zone zone