aenova L Temrnler Ireland Ltd.,

Killorglin, Co. Kerry,

Ireland.

Telephone +353 (0) 66 9792600

Fax +353 (0) 66 9792606

V,A.T. No IE 9581587N

Ms Maria Lenihan, OEE Regional Office, SouthlSouth West Region, Environmental Protection Agency, lnniscara, CO Cork. 26.06.2079

Subject: Groundwater Monitoring - Summary R I 2019

Dear Ms Lenihan,

See summary report for Rf 2019. Assessment of groundwater analytical data was completed by comparing the data with the following published guidelines:

European Union Environmental Objectives (Groundwater) (Amendment) Regulations 2016, Statutory Instrument No. 366, 2016. Groundwater Threshold Values (GTV) Environmental Protection Agency (EPA) Interim Guideline Values (IGV) Dutch Intervention Values (DIV)

The R I summary is for eight monitoring wells agreed with the Agency.

RI: sampling of target wells MW3, MW8, MWII, MW18, MW25d, and non- target wells, MW5, MW23 and MW26d.

Samples were analysed for VOCs and redoxlbiodegradation indicators. A full review of the results was undertaken and any unusual trends have been noted.

Results for chemicals of potential concern, COPC’s, have been compared to the IGV’s & DIV’s with trends noted from previous analysis. In addition, a comparison of Groundwater Threshold Value, GTV’s, has been undertaken, where applicable.

While individual results represent a snapshot of conditions at a given time, temporal trends give an overall indication of groundwater condition. Therefore, once off elevated or reduced levels of contaminants will need to be reviewed with this in mind.

If you have any queries or require any further clarification on the enclosed, then do not hesitate to contact me.

Yours Sincerely

EHS Manager. Pat Griffin:

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C.P.M. 8 Drageoopharm EVP 9 Haupt Pliarms swiss Caps SwissUo e remmhr

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EPA Export 03-09-2019:04:15:27

aenova L Groundwater Results RI 2019

Eight Monitoring wells were sampled for R I 2019, target wells MW3, MW8, MW'lI, MW18, MW25d, and non-target wells, MW5, MW23 and MW26d.

Volatile organic compounds (VOC's) were analysed by Alcontrol Geochem, Hawarden, UK.

Results for chemicals of potential concern, COPC's, are summarised in Tables 1 to 5. The tables also contain IGV's & DIV's and GTV's for comparison. Results for 201 5 to 201 8 are also shown. Table 6 contains results of parameters indicating reducing groundwater conditions and Table 7 contains information on the locations of the monitoring wells and also gives the depth to the water level for each monitoring well sampled.

The IGV for Trichloroethene is exceeded in three of the monitoring wells, MW3, MW8 & MW7 I The GTV is also exceeded in these monitoring wells and additionally MW23. There was a slight increase for MW3, while there is a slight decrease for MW5, MW8, MWII, MWI8 and MW25D.The remaining monitoring wells are very stable.

Monitoring wells, MW5, MWI 'l, MW18 and MW23 are at the method detection limit of 1 ug/l for Cis-1,2-DichIoroethene* MW3, MW8, MW25D and MW26 show levels between 2- 15ug/l.

All the monitoring wells are at the method detection limit of I ugll for Vinyl Chloride.

The IGV for Chloroform is exceeded in MW3, MW8 and MWI I. The GTV is also exceeded in MW8 at 184ug/l.

The IGV for monochlorobenzene, (I ug/l), is exceeded in MWI 8 (5ugA) but the overall trend is very stable with the other monitoring wells at the method detection limit.

Groundwafer Compliance Monitoring

In line with the EPA's risk-based approach to setting of compliance values for historical contamination at licensed sites, AECOM proposed to use a combination of generic GTVs and IGVs and site-specific WS derived as part of the QRA completed for the Temmler site in 2006 and 2007. In the absence of a G W , the corresponding vvn/ is used for setting compliance values for the site.

In light of the recent changes to the GTV, the following concentrations are proposed as compliance values for all of the compliance monitoring points:

MCB compliance value of 1 pgIL (GTV of I 0 pg/L, IGV and VVrV of 1 p g l l )

TCE compliance value of 7.5 VglL (GTV of 7.5 pgIL, IGV and WTV of 10 pg/L)

TCM compliance value of 12 pg/L (no GTV defined, IGV and vvI"v of 12 ygIL)

cDCE compliance value of 0.375 yg/L (GTV of 0.375 pglL, IGV and wnl of 30 vg/L)

VC compliance of 0.375 pg& (GTV 0.375 pg/L, no IGV defined and WTV of 10 pg&)

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C.P.M. Dragenopharm 0 EVP* Heupl Phar&tTSwlss Caps S&sCo Ternmler

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EPA Export 03-09-2019:04:15:27

Trend graphs for all COPCs in groundwater from the five compliance points are presented in Attachments 3 -7, (Figures 13 - 77). Compliance point monitoring graphs will be updated by AECOM annually.

ConcIusion

The trend for the COC’s in the target wells is generally stabte. A number of the target wells show moderate decreases for COPC while others have a moderate increased. The presence of low levels of Cis-I ,2- Dichloroethene and Vinyl Chloride in several of the monitoring wells shows that active degradation of Trichloroethene is still occurring.

Definitions

I CV:

DIV: Dutch Intervention Value

GTV: Groundwater Threshold Value,

COPC’s: Chemicals of potential concern

MDL: Method Detection Limit

Attachments

Attachment 1 (Figure1 I)

Attachment 2 (Figure 12)

Attachment 3 (Figure 14)

Attachment 4 (Figure 15)

Attachment 5 (Figure 16)

Attachment 6 (Figure 17)

Attachment 7 (Figure 13)

EPA Draft Interim Guideline Value for the protection of groundwater

Groundwater Flow Sand & Gravel

Groundwater Flow Bedrock

TCE concentrations at Compliance Points

cDCE concentrations at Compliance Points

VC concentrations at Compliance Points

TCM concentrations at Compliance Point

MCB concentrations at Compliance Points

whrlsll - C.P.M. Diagenopharm EVP Haupl P W Swiss cops swissco Ismmler

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EPA Export 03-09-2019:04:15:27

aenova L Table 2: Trichloroethene, IGV - I Ougil, (shaded yellow if exceeded D N - 50OugA. (fant d ifex&) Groundwater Threshold Value, GTV - 7.5 ug. (*if exceeded)

Note: MDL for TCE for Feb 2019 is lug/l

5/76

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EPA Export 03-09-2019:04:15:27

aenova L Table 3: Cis-l,Z-Dichlaroethene,m DIV - 20ugn. (: Groundwater Threshold Value, GTV- 0.375ug. (*if exceeded). NO cDCE GTV prior to 3une 201 6 amendment.

d ii

Note: M13L for cDCE for Feb 2019 is lugh Data for Sept 2018 monitoring corrected to reflect the database.

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EPA Export 03-09-2019:04:15:27

Table 4: Vinyl Chloride, IGV - none specified

Groundwater Threshold Value, GTV - 0.375 ugL (“exceeded)

DIV - Sug/l. ( € 0 ~ rad if rded)

Note: MDL for VC for Feb 2019 is lugA

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I

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P VI

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EPA Export 03-09-2019:04:15:27

Table 6: Parameters indicating Reducing Groundwater Conditions

Table 7 : Summary of Water Levels

Depth to Water (in) ~

Monitoring Wcll Locfition Stp‘15 M s r Sep‘ Mar Scpt Mar Scpt Pcb

‘19

MW3 (down gradient, close to 8 6.4 7.8 6.5 7.9 7.0 8.0 6.6 centre of site)

AlCL boundary

$18 *I& 16 ‘17 Dec ‘18 ‘17

MW5 (SW of centre, inside 5.5 4.6 5.5 5.6 4.4 5.8 4.7

MW6 (down gradient, NW end 4.3 5.6 - 4.6 5.5

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EPA Export 03-09-2019:04:15:28

J

aenova L Attachment I

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ENVIRONMENTAL CONSULTANT$

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L

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LCOPW

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' 4 . . I

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EPA Export 03-09-2019:04:15:28

ConcentraUoa (pgfi)

0 l-Jan-Ol

01-Jan-08

01-Jen-10

Ol-Jan41

02-Jan-12

01San-14

02-An-113

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EPA Export 03-09-2019:04:15:28

Concentratlon (vglL)

DtX-I 99s

Apr-2001

Sep-2002

Jan-2004

May-200s

act-2006

Feb-2008

J ~14008

Apr-2012

Aug-20 1 3

Oec-2014

May-2016

sep-2017

Feb-2019

8 I

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EPA Export 03-09-2019:04:15:28

Attachment 7

Figure 13: MCB Concatrations at Conrpliance Points On Site

15.0 , 1/01 0

9.0

6.0

3.0

0.0 '

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