HomeMy WebLinkAbout2002 03 25 Informational M Detection of Contaminant in the Wells
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COMMISSION AGENDA
ITEM
M
CONSENT
INFORMA TIONAL X
PUBLIC HEARING
REGULAR
March 25, 2002
Meeting
MGR rEPT )/j/
Authorization
REQUEST: Utility Department Informing the City Commission of the Detection of a
Contaminant in the Wells at Water Treatment Plant #3.
PURPOSE: The purpose of this agenda item is to inform the City Commission of the detection
of a contaminant in the wells at WTP #3 and advise on the plan of action..
CONSIDERA TIONS:
The Utility Department samples the water supply for primary and secondary
contaminants as defined by DEP every three years. In light of the recent detection of
contaminants in the Lake Mary water supply, it was decided to conduct the sampling
during the fall of2001 in advance of the November, 2002 requirement. Samples at
WTP#1 (Northern Way) and WTP#2 (Sheoah Boulevard) came back negative.
However, the analysis of the sample from WTP#3 resulted in the detection. of a
contaminant, cis-1 ,2- Dichloroethylene. The contaminant was most recently measured at
1.59 parts per billion and 1.73 parts per billion at wells 3 and 5, respectively, at WTP #3.
The maximum contaminant level for cis-1 ,2-Dichloroethylene is 70 parts per billion. The
action level is 35 parts per billion, When contaminants are detected at the action level,
DEP requires a plan of action be submitted to address removal of the contaminants when
the MCL is reached. The most common method of removal is air stripping.
The most recent lab results are attached. As can be seen, the 1.59 ppb and 1.73
ppb are both barely above the detection limit of 0.5 ppb. We will be retaining a
hydrogeologist to help us evaluate potential sources and an intermediate plan of action.
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Informational Agenda Item M
March 25, 2002
Page 2
We have instituted quarterly sampling for Volatile Organic Contaminants at all
three water plants at an additional annual cost of approximately $1,400. The annual
Consumer Confidence Report that is mailed to all residents in June which lists all water
sample results. It will include the detection of this contaminate along with a brief
explanation.
ATTACHMENTS:
1. Sample Results
COMMISSION ACTION:
l'!"
ATTACHMENT #1
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Volatile Organic Analysis
62-5SO.31 0(2) (b)
(PWS028)
Parameter SarT'4>le Analysis Analytical Delection MCL Analysis
10 NAME Nurroar Result(ugl1) Method Limit (ugl1) Date
2378 l,2,4-trichlorobenzene 16892 <0.5 EPA502.2 0.5 70 02~-02
2380 cis-1.2-0ichforoethylene 16892 1.59 EPA502.2 0.5 70 02-04-02 ~
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2955 Xytenes (total) 16892 <0.5 EPA502.2 0,5 10000 02-04-02
2964 Oichloromethane 16892 <0.5 EPA502.2 0.5 5 02-04-02
2968 O<Iichlorobenzene 16892 <0.5 EPA502.2 0.5 600 02-04-02
2969 Para-dichlorobenzene 16892 <0.5 EPA502.2 0.5 75 02-04-02
2976 Vinyl chloride 16892 <0.5 EPA502.2 0.5 1 02-04-02
29n 1.1,-dichloroethylene 16892 <0.5 EPA502.2 0.5 7 O2-<l4-O2
2979 T rans-1,2-dlchloroethytene 16892 <0,5 EPA502.2 0.5 100 02-04-02
2980 1.2,-dlchloroethana 16892 <0.5 EPA502.2 0.5 3 02-04-02
2981 1,1, I-trichloroethane 16892 <0.5 EPA502.2 0.5 200 02.04-02
2982 Carbon tetrachloride 16892 <0.5 EPA502.2 0.5 3 O2-<l4-O2
2983 1.2-dichloroprope.ne 16892 <0.5 EPA502.2 0.5 5 02-<l4-O2
2964 Trichloroethylene 16892 <0.5 EPA502.2 0.5 3 O2-<l4-O2
29SS 1,1,2-trichloroethana 16892 <0.5 EPA502.2 0.5 5 02-<l4-O2
2987 T etrachloroethylena 16892 <0.5 EPA502.2 0.5 3 02.04-02
2989 Monochlorobenzene 16892 <0.5 EPA502.2 0.5 100 02-04-02
2990 Benzene 16892 <0.5 EPA502.2 0.5 02-0+02
2991 Toluene 16892 <0.5 EPA502.2 0.5 1000 02-04-02
2992 Ethytbenzena 16892 <0.5 EPA502.2 0.5 ' 700 - . -02'04-02
2996 SlyTene 16892 <0.5 EPA502.2 0.5 100 02-04-02
Section 3 of 5
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Volatile Organic Analysis
62-55O.310(2)(b)
(PWS028)
Parameter Sample Analysis Analy1ical Detection MCL Analysis
ID NAME Number Result(ugll) Method limit (u(tl) Date
2378 l,2,4-trichlorobenzene 16893 <0.5 EPA502.2 0.5 70 02-04-02
2380 cls-l,2-Dichloroethylene 16893 1.73 EPA502.2 0.5 70 02-04-02 ~
29'55 Xylenes (total) 16893 <0.5 EPA502.2 0.5 1??oo 02-04-02
2964 Dichloromethane 16893 <0.5 EPA502.2 0.5 5 02..{)4...()2
2968 ().dichlorobenzene 16893 <0.5 EPA502.2 0.5 600 02-<>4-02
2969 Para-dichlorobenzene 16893 <0.5 EPA502.2 0.5 75 02-04-02
2976 Vinyl chloride 16893 <0.5 EPA502.2 0.5 02..{)4...()2
2977 l,l,-dichloroethylene 16893 <0.5 EPAS02.2 0.5 7 02-04-02
2979 T ra ns-l,2-dichloroethylene 16893 <0.5 EPA502.2 0.5 100 02-04-02
2980 1.2.-dichloroethane 16893 <0.5 EPA502.2 0.5 3 02-04-02
2981 1, 1, 1-trlchloroethane 16893 <0.5 EPA502.2 0.5 200 02..{)4...()2
2982 Carbon tetrachloride 16893 <0.5 EPA502.2 0.5 3 02..{)4...()2
1.2-dichloropropane 16893 <0.5 EPA502:2 0.5 5 02-04-02
2983
18893 <0.5 EPA502.2 0.5 3 02-04-02
2984 Trichloroethylene
16893 <0.5 EPA502.2 0.5 5 02-04-<>2
2985 1,1,2.trichloroethane
<0.5 EPA502.2 0.5 3 02-<>4-02
2987 Tetrachloroethylene 16893
EPA502.2 0.5 100 02-04-02
16893 <0.5
2989 Monochlorobenzene EPA502.2 0.5 02-04-02
16893 <0.5
2990 Benzene EPA502.2 0.5 1000 02-04-02
16893 <0.5
2991 Toluene 700 02-04-02 ..-.. - - .-
-- -- -~.. . ~.. .. . - EPA502.2 . 0.5 .
16893 <0.5 100 02-<>4--02
2992 Ethylbenzene EPA502.2 0.5
16893 <0.5
2996 Styrene
Section 3 of 5