ST8805-CS 890609 The City With A Beautiful Future
June 9, 1989
P.O. Box 478 , ~'-
Coppel,, T~~. ~
214-462-~ ..... ~
Mr. Marty :tus
NDRC Headqu ~ers, Inc.
3553 Miller '.ye
Garland, 75042
RE: PARKWAY 5EVARD WATER SAMPLES - COPPELL, TEXAS
Dear Mr.
As per our t, conversation on June
clarification o three bacteriological samples,
9831, reported by Laboratories, Inc.
2, 1989, requesting
Lab No. 9829-9830 and
My question was regarding your reporting procedures indicating a detection
limit of 3 col/100 ml or less as being a passing water sample, accepted by
the Texas Department of Health.
I am sending you copies of information published by the Texas Department
of Health and Texas A&M University, which indicates a passing water sample
analysis will indicated "no cloriform organisms found".
Please confirm, in writing, that the less
Texas Department of health regulations
above.
than 3 col/100 ml meets the
for each of the samples listed
Should you have any questions, please contact me at (214)'462-0022.
Sincerely,
Larry D~v~s
Constr~ction ~nspector
LD/lsg
xc:
Murray Construction
L.H. Lacy Company
Howard Pafford
Jerry Parche, P.E.
Russell R. Doyle, P.E.
PRKW/WTR
BACTERIOLOGICAL QUALITY OF WATER
TOPICS DISCUSSED:
III.
I. Test for coliform group
A. Definition of coliform group
B. Media and technique of presumptive test
C. Media and technique of confirmed test
D. Media and technique of completed test
E. Membrane filter techniques
II. Safe Drinking Water Standards
A. Number of samples
B. Quality
Most Probable Number
SUMMARY:
(1)
(2)
(3)
(4)
(5)
(6)
(7)
The coliform group is defined as being all of the aerobic and
facultative anaerobic Gram-negative, non-spore-forming short rod
bacilli which ferment lactose with gas formation within 48 hours
at 35 degrees centigrade.
Lactose broth or Lauryl Tryptose broth may be used in the pre-
sumptive test.
Brilliant Green Lactose Bile Broth or Eosin Methylene Agar
Plates may be used in the confirmed test.
Completed test may be applied to Brilliant Green Lactose Bile
Broth tubes showing gas or to typical or atypical colonies
found on Eosin Methylene Blue or Endo Agar plates.
The Membrane Filter method gave faster results than the fermen-
tation tuu~ method,
The number of samples collected per month to meet Safe Drinking
Water Standards is dependent upon population.
Bacteriological qualities necessary to meet Safe Drinking Water
Standards are as follows using the fermentative tube method:
a. Of all the l0 ml portions examined per month not more than
10% shall show the presence of coliform organisms.
b. Three or more of the 5 ml portions of a single sample may
show the presence of coliform organisms provided it does not
occur in consecutive samples nor in more than 5% of the
samples per month if over 20 samples are examined or in more
than one sample if less than 20 samples have been examined.
Provided further that when three or more of the 5 ml
portions show the presence of coliform organisms, daily
samples shall be examined until two consecutive samples show
the water to be good quality.
-1-
TE),AS DEPARTMENT OF HEALTH LABORATORIES
WATER BACTERIOLOGY ANALYSIS
Name of Water System
County
lloint of Collection
S~nd report to:
NAME
Collected by
Date
{Mo., Day, Yr.)
[,,rm No. G-19
STREET
CITY
Water System Identification Number
TEXAS
(Zip
Time
AM/PM
TYPE OF SYSTEM:
CI Public ODeiry
C]lndividual OBottled Water
I-1 School E]Swimmmg Pool
Ownership or other information:
n Alternale Test
SAMPLE IS:
(Public Systems Only)
[3Oistribution
l-IRaw
C~Check
ClConstruction
C]St3ecial
WATER SOURCE
OR iver
C) Lake
r-lWall
Well depth
Chlorine residua!
E']Prelimmary Report /
OFinal Rt~port J'
M-'~PN Conf, med'Test.
MPN Completed Test
MF Coliform Count Ipresumptive}
MF Coliform Count (verified}__
Coliform Orgamsms
Lab. Ident. No.
and Name
[3Found [-]Not Found
/100 mi.
Unsatisfactory
E3F3rm ~ncomplete. (See en¢*rcled item.}
[~mple too old. Sample not received within 30 hours of collection.
~] Excessive chlorine present *fl s~mole.
OBroken ,n shipment
~Date discrepancy.
~uantttV too gre~t t~ permit agitation.
~Ouantity msuffic,ent for armlvs*s, (100 mi. mimmum)
~Bottle nol I)row~d I)y lh~5 lat~oralnry.
~Heavy nor~-~olif~rnl ~ctell.* ~lt pr~ent, possibly ob~uring and comprom~ling tilt.
fi'lease ch~ck AIl{,mate T~i un~ Ownership and Other Information when
resubmitting.)
~Only one sample ~r time and point of collection required.
Other
Approved by
W.tter of satisfactory bacteriological quality should be free from Coliform Organisms.
17
Since it is impo.~sible to trace the origin of fecal pollution to deter-
mine whether it came from animal or man, the further to determine whether
tl~. animal or man was sick or well, it is necessary and safer to keep
the water free from all ft, cal pollution. To be sure that this has been
accomplished samples of the water should be submitted periodically to
a laboratory for bacteriological analysis. When the report of this analysis
indicates "no coliform organisms found," the water is considered "safe."
If the laboratory reports "coliform organisms present," it is evidence
of fecal pollution and the water is considered "unsafe" and unfit for human
consump t ion.
Number of Samples to be Collected. The minimum number of samples to
be collected from a public water supply and submitted for examination
shall be in accordance with the following table.
Poi~_ulat on Served
0 to 1,000
1 001 to 3,300
3 301 to 4,100
4 101 to 4,900
4 901 to 5,800
5 801 to 6,700
6 701 to 7,600
7 601 to 8,500
8 501 to 9,400
9401 to 10,300
10,301 to 11,100
11,101 to 12,000
12,001 to 12,900
12,901 to [3,700
1'~,701 to 14,600
14,601 to 15,500
i5,501 to 16,300
16,301 to 17,200
17,201 to 18,100
18,101 to 18,900
18,901 to 19,800
19,801 to 20,700
20,701 to 21,500
21,501 to 22,300
22,301 to 23,200
23,201 to 24,000
24,001 to 24,900
24,901 to 25,000
25,001 to 28,000
28,001 to 33,000
33,001 to 37,000
37,001 to 41,000
~!,001 to 46,000
Minimum Number of
Samples Per Month
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
3O
35
4O
45