Maine Department of Environmental Protection (MEDEP) Stone Farm, Arundel Sample Collection - Data Report Summary Report Date: June 15, 2017

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Maine Department of Environmental Protection (MEDEP) Stone Farm, Arundel Sample Collection - Data Report Summary Report Date: June 15, 2017

1 Maine Department of Environmental Protection (MEDEP) Stone Farm, Arundel Sample Collection - Data Report Summary Report Date: June 15, This memo summarizes field activities and the per- and polyfluoroalkyl substance (PFAS) data from the drilling and Phase II sample collection completed May 2 nd through May 4 th. Data from the initial January and February events are noted as appropriate on the figures and the field activities are briefly described in the following paragraphs. The Department is still reviewing the data with the other agencies that are involved in the project, and has not reached final conclusions based on the newest information. MEDEP is expecting additional data from the laboratory that may help refine conclusions and the conceptual model for the site. The laboratory issue is addressed in greater detail below. Field Activity Summary (January 26 th ): Sample collection was completed on January 26, 2017 following the Phase I Sampling and Analysis Plan (SAP) dated December 20, A sample of the pellet feed and a sample of a round hay bale were collected. The pellet feed was a simple grab sample and the hay was collected using a portable drill corer, from multiple locations in the bale. Details for collection of soil, water and milk were provided in a previous report date February 24, Field Activity Summary (February 27 th ): An additional sample collection event was completed based on the initial data from January. Details of that sampling event are described in a report dated March 7, During the February sample event, a post-agitation milk sample was collected using a dipper connected to a stainless steel rod to facilitate sample collection. Two manure samples were collected to determine if that material contains residual PFOS or other fluorinated compounds. One fresh sample was collected where the cows are housed and a second was collected from a manure pile excavated from the pack accumulated in the barn. Three additional shallow soil samples were collected using hand methods. Two soil samples were collected from the western-most field on the property and a third was collected from screened sand stockpiled in the gravel pit. Field Activity Summary (May 2 nd through May 4 th ): Field activities followed the Phase II SAP, dated April 26, 2017, and the PFAS sampling protocols used in previous investigations. Sampling was completed for soil, milk, surface water and groundwater. To support installation of background groundwater monitoring wells and to improve characterization of the geology the drilling contractor completed two electrical conductivity (EC) logs of the soil profile, one just north of Curtis Road across from the gravel pit, planned as MW-101, and one to the east south of Curtis Road (EC-02) near the eastern boundary of the Stone property. The location originally planned for the MW-102 was not accessible due to wet ground. At EC-01 soil cores were collected to confirm interpretation of the EC log down to 50 feet below ground surface (bgs), and to see if inflections in the profile were sand zones that could be screened. Despite being located approximately 75 feet from the gravel pit, the EC-01/MW-101 profile and coring showed there is no sand present until a depth of 76 feet bgs. At EC-02 to the east, there was no significant

2 Stone Farm, Arundel Report Date: June 14, 2017 Sample Collection - Data Report Summary Sampling Dates: May 2 nd, 3 rd and 4 th, 2017 sand interpreted from the profile, from the surface to 72 feet bgs with refusal on bedrock, so no well was installed. Figures 1A and 1B show the EC profile at EC-01/MW-101 and EC-02. A deep background well was installed at MW-101, screened feet bgs in the interpreted sand zone, similar in depth to MW and the Stone residential well. Based on the boring log at MW-01, a shallow water table background well was installed adjacent the broken MW-1, screened at feet bgs. Groundwater was initially interpreted at 27 feet bgs during drilling. Following development the two new wells were sampled using low-flow methods. In addition, MW- 04 (located south of the pit), the Stone dug well, and the Stone residential well were sampled. The residential well was sampled from near the pressure tank in the basement, the other wells were sampled following low-flow protocols. Two surface water samples were collected, one a resample of the SW-2 location in the gravel pit, and one from a new location (SW-3) from a drainage flowing to the river from the eastern agricultural fields. To further delineate and bound surface soil impacts, samples were collected from locations immediately to the west of the Stone property, on a hill north of the barn, on a knoll south of the eastern fields, and from the edge of the southern-most field near the Kennebunk River. Two samples were also collected from offsite at the Harris property, based on a history of activity similar to the Stone property. To assess vertical migration of PFAS, four soil borings were completed in the agricultural fields. Direct-push borings were completed to 20 feet bgs, and sampled in one foot intervals near the surface, and at the water table if one was evident. Two borings were located at the highest surface soil values from the January sample event. One was located in a field near the river not previously sampled, and one was in a middle field near the highest previous soil data, that had not been previously sampled. Milk was sampled from the storage tank in the barn, pre- and post-agitation, to assess concentration trends and for comparison to water concentrations shortly before the farm installed a groundwater treatment system. Analytical Results: All samples were shipped to Vista Analytical Laboratory, scheduled for 20-day turn-around time. The results for all the May 2017 samples have now been received and internally validated. The laboratory was instructed to report all the PFAS compounds on their standard list, but initially only provided data for the same six PFAS compounds that were reported in previous samples, a list that matches the six compounds from USEPA s Unregulated Contaminant Monitoring Rule 3 (UCMR3) requirement. The laboratory is re-extracting and analyzing the samples to report the full list of compounds, however the UCMR3 list includes the two compounds that now have USEPA Health Advisory criteria (perfluorooctanoic acid, also commonly referred to as pentadecafluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS)). The laboratory blank contained a small detection of PFOS that results in a B flag for most of the water results for PFOS. It is possible the very low detections of PFOS in groundwater (around 2 ) are related to laboratory background. The data for PFOA and PFOS are summarized on Figures 2, 3, and 4, and are also summarized in the tables below. Previously reported data is only included for surface soil where deeper intervals at the same location were sampled in May. All the PFAS data have been converted to parts per trillion for ease of reference. Soil boring data for depths below twelve inches is not illustrated on Figure 3. Page 2 of 7

3 Stone Farm, Arundel Report Date: June 14, 2017 Sample Collection - Data Report Summary Sampling Dates: May 2 nd, 3 rd and 4 th, 2017 MILK SAMPLES (Sample Date, includes Pre- and Post-Agitation and a Field Duplicate): MILK MILK MILK TANK LABORATORY PARAMETERS ACRONYM UNITS TANK TANK PRE 1 POST 2 POST- Dupl. PERFLUOROBUTANE SULFONIC ACID PFBS ND 3 (<100) ND (<100) ND (<100) PERFLUOROHEPTANOIC ACID PFHpA ND (<50) ND (<50) ND (<50) PERFLUOROHEXANE SULFONATE PFHxS ND (<50) ND (<50) ND (<50) PENTADECAFLUOROOCTANOIC ACID PFOA ND (<50) ND (<50) ND (<50) PERFLUOROOCTANE SULFONATE PFOS J 4 PERFLUORONONANOIC ACID PFNA ND (<50) ND (<50) ND (<50) SURFACE WATER SAMPLES (Sample Date ): LABORATORY PARAMETERS ACRONYM UNITS SW-2 SW-3 PERFLUOROBUTANE SULFONIC ACID PFBS ND (<4.2) 2.5 J PERFLUOROHEPTANOIC ACID PFHpA 0.89 J 17.9 PERFLUOROHEXANE SULFONATE PFHxS ND (<2.1) 7.39 J PENTADECAFLUOROOCTANOIC ACID PFOA 4.5 J 249 PERFLUOROOCTANE SULFONATE PFOS 19.5 B B PERFLUORONONANOIC ACID PFNA ND (<2.1) 3.7 J GROUNDWATER SAMPLES (Sample Date, 5/3/17 and 5/4/17): LABORATORY PARAMETERS ACRONYM UNITS MW-4 MW-101 MW-102 DUG WELL PERFLUOROBUTANE SULFONIC ACID PERFLUOROHEPTANOIC ACID PERFLUOROHEXANE SULFONATE PENTADECAFLUOROOCTANOIC ACID PERFLUOROOCTANE SULFONATE PERFLUORONONANOIC ACID PFBS PFHpA PFHxS PFOA PFOS PFNA ND (<4.0) ND (<5.1) ND (<4.2) J ND (<2.5) ND (<2.1) 5.74 J 1.73 J ND (<2.5) ND (<2.1) 1.58 J 41.2 ND (<2.5) ND (<2.1) 6.95 J 2.32 J, B 2.12 J, B 2.14 J, B 2.52 J, B ND (2.0) ND (<2.5) ND (<2.1) ND (<2.1) 1 Tank agitation was turned off for 3.5 hours prior to sample collection. 2 Tank agitation was turned on for 10 minutes prior to sample collection. 3 ND = Non-Detect 4 J = Estimated Value, typically below reporting limit and above detection limit. 5 B = Compound also detected in the laboratory method blank. Page 3 of 7

4 Stone Farm, Arundel Report Date: June 14, 2017 Sample Collection - Data Report Summary Sampling Dates: May 2 nd, 3 rd and 4 th, 2017 RESIDENTIAL WELL SAMPLE (Sample Date ): LABORATORY PARAMETERS ACRONYM UNITS (dry weight) RES-001 PENTADECAFLUOROOCTANOIC ACID PFOA 5.54 J PERFLUOROOCTANE SULFONATE PFOS 30.6 B *The laboratory also reported four additional perfluorinated compounds as non-detect PFHpA, PFNA, PFBS, and PFHxS). Page 4 of 7

5 Stone Farm, Arundel Report Date: June 14, 2017 Sample Collection - Data Report Summary Sampling Dates: May 2 nd, 3 rd and 4 th, 2017 SURFACE SOIL SAMPLES (Sample Date, 5/3/17 and 5/4/17): LABORATORY PARAMETERS ACRONYM UNITS SS-15 SS-16 SS-17 SS-18 SS-19 SS-20 PERFLUOROBUTANE SULFONIC ACID PFBS ND 1 (<500) ND (<490) ND (<510) ND (<500) ND (<500) ND (<520) PERFLUOROHEPTANOIC ACID PFHpA ND (<250) ND (<240) ND (<260) ND (<250) ND (<250) ND (<260) PERFLUOROHEXANE SULFONATE PFHxS ND (<500) ND (<490) ND (<510) ND (<500) ND (<500) ND (<520) PENTADECAFLUOROOCTANOIC ACID PFOA 205 J J 244 J 157 J 1,100 J 889 J PERFLUOROOCTANE SULFONATE PFOS ND (<500) ND (<490) 4,570 3,580 11,000 25,700 PERFLUORONONANOIC ACID PFNA ND (<250) ND (<240) ND (<260) ND (<250) 159 J 144 J LABORATORY PARAMETERS ACRONYM UNITS SS-21 5/3/17 SS-22 5/3/17 SS-23 5/3/17 SS-24 5/3/17 PERFLUOROBUTANE SULFONIC ACID PFBS ND (<500) ND (<500) ND (<510) ND (<510) PERFLUOROHEPTANOIC ACID PFHpA ND (<250) ND (<250) 169 J 170 J PERFLUOROHEXANE SULFONATE PFHxS ND (<500) ND (<500) ND (<510) ND (<510) PENTADECAFLUOROOCTANOIC ACID PFOA ND (<130) 550 J 994 J 1,400 J PERFLUOROOCTANE SULFONATE PFOS ND (<500) 726 J 4,910 5,970 PERFLUORONONANOIC ACID PFNA ND (<250) 143 J 195 J 222 J *Soil data rounded to 3 significant figures. **ND DETECTION LIMITS ROUNDED OFF TO 2 SIGNIFICANT DIGITS. 1 ND = Non-Detect 2 J = Estimated Value, typically below reporting limit and above detection limit. Page 5 of 7

6 Stone Farm, Arundel Report Date: June 14, 2017 Sample Collection - Data Report Summary Sampling Dates: May 2 nd, 3 rd and 4 th, 2017 SOIL BORING SAMPLES (Sample Date 5/3/17 where not specified): LABORATORY PARAMETERS ACRONYM UNITS PERFLUOROBUTANE SULFONIC ACID PERFLUOROHEPTANOIC ACID PERFLUOROHEXANE SULFONATE PENTADECAFLUOROOCTANOIC ACID PERFLUOROOCTANE SULFONATE PERFLUORONONANOIC ACID PFBS PFHpA PFHxS PFOA PFOS PFNA SS-2/SB /26/17 ND 1 (<500) SB SB SS-3/SB /26/17 SB SB SB Feet ND (<510) ND (<510) ND (<480) ND (<500) ND (<500) ND (<500) 1,620 J J 157 J 1,480 J 397 J 202 J ND (<250) 403 J ND (<510) ND (<510) 313 J ND (<500) ND (<500) ND (<500) 23,600 2,430 2,140 J 18,200 4,350 2,060 ND (<120) 759,000 28,500 14, ,000 65,800 17,200 ND (<500) 1,670 J ND (<250) ND (<260) 1,250 J ND (<250) ND (<250) ND (<250) LABORATORY PARAMETERS ACRONYM UNITS SB PERFLUOROBUTANE SULFONIC ACID PFBS ND (<500) ND (<510) ND (<500) ND (<500) ND (<490) ND (<500) PERFLUOROHEPTANOIC ACID PFHpA 330 J ND (<260) 186 J ND (<250) ND (<250) 194 J PERFLUOROHEXANE SULFONATE PFHxS 271 J ND (<510) ND (<500) ND (<500) ND (<490) ND (500) PENTADECAFLUOROOCTANOIC ACID PFOA 5,040 1,820 J 4,630 1,080 J 141 J 2,700 PERFLUOROOCTANE SULFONATE PFOS 79,000 7,980 98,200 21,800 ND (<490) 64,200 PERFLUORONONANOIC ACID PFNA 650 J ND (<260) 332 J ND (<250) ND (<250) 218 J SB SB SB SB SB Feet *Soil data rounded to 3 significant figures. **ND DETECTION LIMITS ROUNDED OFF TO 2 SIGNIFICANT DIGITS. 1 ND = Non-Detect 2 J = Estimated Value, typically below reporting limit and above detection limit. Page 6 of 7

7 Stone Farm, Arundel Report Date: June 14, 2017 Sample Collection - Data Report Summary Sampling Dates: May 2 nd, 3 rd and 4 th, 2017 Figure 1A and Figure 1B: FIGURES (MW-101) Page 7 of 7

Ü Surface Water, and Groundwater Data - January - May 2017 FIGURE 2 MAP DATE 2017 Aerial 2015 Drinking Water/Surface Water Data - USEPA Health Advisory (Drinking Water) and Maine MEG - 70 Total

14 J,B Curtis Rd SW-2 EC-01 05/04/17 PFOS 2.12 B MW-101 SS-4 SB-3 01/26/17 05/02/17 PFOS 33.4 PFOS 19.5 B PFOA 7.7 PFOA 4.5 J SS-5 SS-6 SS-9 MW-14-09-KKWWD RW-001 &3 01/26/17 PFOS 5.7 PFOA 2.

95 J SS-10 SS-11 SS-18 Le ge nd all wells POINT_TYPE &3?

8 Ü Surface Water, and Groundwater Data - January - May 2017 FIGURE 2 MAP DATE 2017 Aerial 2015 Drinking Water/Surface Water Data - USEPA Health Advisory (Drinking Water) and Maine MEG - 70 Total PFOS/PFOA Maine CDC Surface Water Screening values Recreational: PFOA 170 PFOS 300 Construction Worker: PFOA 740 PFOS 1300 SS CURTIS RD SS-20 &3 SS-22 SB-1 SS-2 05/02/17 PFOS 2.14 J,B Curtis Rd SW-2 EC-01 05/04/17 PFOS 2.12 B MW-101 SS-4 SB-3 01/26/17 05/02/17 PFOS 33.4 PFOS 19.5 B PFOA 7.7 PFOA 4.5 J SS-5 SS-6 SS-9 MW KKWWD RW-001 &3 01/26/17 PFOS 5.7 PFOA 2.2 SS-7 SS-8 05/02/17 PFOS 2.32 J,B PFOA 41.2 MW-04 Farm's Drinking Water Supply Well 01/26/17 PFOS 42.1 PFOS 30.6 B PFOA 8.9 PFOA 5.54 J Dug Well 05/02/17 PFOS 2.52 J,B PFOA 6.95 J SS-10 SS-11 SS-18 Le ge nd all wells POINT_TYPE &3? DOM ESTIC W ELL MON ITORI NG WEL L PIEZOM ETER SW-3 Sample_Location_BRWM POINT_TYPE GEO-PRO BE SEDIMENT SAMPLE SOIL S AMP LE SURFACE WATER &% Public_D rin kin g_w ate r_s upp lie s 05/02/17 PFOS 476 PFOA in = 200 feet MW-7-09S MW-7-09 G KKWWD Production Well MW-4-09 MW-5-09S MW-5-09 MW-2-08 MW-3-08 &% MW-1-08 MW-3-08OBS MW MW Feet

Ü Le ge nd all wells POINT_TYPE &3? DOM ESTIC W ELL MON ITORI NG WEL L PIEZOM ETER Sample_Location_BRWM POINT_TYPE ELEC.

PFOA 4,630 SS-14 SS-3 SB-2 PFOS 878,000 PFOA 18,200 PFOS 151,200 PFOA 3,544 SS-15 SS-13 SB-1 SS-2 PFOS 79,000 PFOA 5,040 SS-4 SB-3 SS-5 PFOS 62,700 PFOA 2,400 PFOS 11,000 PFOA 110 J PFOS 25,700 PFOA

Surface Soil, Feed, Manure and Milk Data January - May 2017 MW-1-KKWWD EC-01 MW-101 SW-2 SAND PILE PFOS 423 PFOS 726 J PFOA 550 J SS-9 PFOS 600 J MW-14-09-KKWWD RW-001 &3 SS-22 SS-10 SW-1 PFOS 1,800

9 Ü Le ge nd all wells POINT_TYPE &3? DOM ESTIC W ELL MON ITORI NG WEL L PIEZOM ETER Sample_Location_BRWM POINT_TYPE ELEC. C ON D UC TIVITY GEO-PR OBE SEDIMENT SAMPLE SOIL S AMP LE SURFACE WATER &% Public_D rin kin g_w ate r_ Supp lie s PFOS ND PFOA 91 J PFOS 99,490 PFOA 4,791 SS-16 PFOS ND PFOA 205 J SB-4 PFOS 98,200 PFOA 4,630 SS-14 SS-3 SB-2 PFOS 878,000 PFOA 18,200 PFOS 151,200 PFOA 3,544 SS-15 SS-13 SB-1 SS-2 PFOS 79,000 PFOA 5,040 SS-4 SB-3 SS-5 PFOS 62,700 PFOA 2,400 PFOS 11,000 PFOA 110 J PFOS 25,700 PFOA 889 J SS-7 PFOS 69,600 PFOA 3,300 PFOS 759,000 PFOA 23,600 SS-20 &3 SS-6 PFOS 22,400 PFOA 2,200 SS-8 SS-19 PFOS 51,100 PFOA 2,600 PFOS 6,700 PFOA 970 J 314 CURTIS RD PFOS 1,200 J MW-102 SS-1 MW-04 Surface Soil, Feed, Manure and Milk Data January - May 2017 MW-1-KKWWD EC-01 MW-101 SW-2 SAND PILE PFOS 423 PFOS 726 J PFOA 550 J SS-9 PFOS 600 J MW KKWWD RW-001 &3 SS-22 SS-10 SW-1 PFOS 1,800 J Curtis Rd SS-12 PFOS 5,400 PFOA 600 J SS-11 PFOS 4,700 PFOA 100 J EC-02 SS-21 02/27/17 Pellet Feed Hay PFOS ND PFOS 9,669 PFOA 2,086 02/27/17 Fresh Manure Manure Pile PFOS 10,130 PFOS 20,330 PFOA 3,206 Milk 01/26/17 PFOS 690/938 PFOS ND Milk 02/27/17 PFOS 300 Milk Pre-agit PFOS 336 Milk Post-agit PFOS 236/176 SS-17 PFOS 4,570 PFOA 244 J 1 in = 250 feet Feet SS-18 G SW-3 PFOS 3,580 PFOA 157 J MW-7-09S MW-7-09 KKWWD Production Well MW-5-09S MW-5-09 MW-2-08 MW-3-08 MW-4-09 &% MW MW-1-08 FIGURE 3 MAP DATE MW-6-09 MW-6-09S 2017 Aerial 2015 Milk Data - Soil/Feed/Manure - ng/kg Maine CDC Residential Soil Screening Level 2,700,000 ng/kg PFOS or PFOA Subsurface data at SB-1, SB-2, SB-3 and SB-4 are not shown in this figure. Some values rounded off for this figure, see full laboratory report for additional detail.

Elevation_Contours_2ft Transportation_BRWM Organized Towns 1 in = 150 feet 0 150 300 600 Feet

10 Ü Harris Fields Locations!(!( Dayton Legend Sample_Location_BRWM POINT_TYPE!> DIRECT PUSH GEO-PROBE SEDIMENT SAMPLE 0 SOIL SAMPLE SURFACE WATER Roads_E911 Stream_BRWM Elevation_Contours_2ft Transportation_BRWM Organized Towns 1 in = 150 feet Feet G SS-24 0 York PFOS 5,970 PFOA 1,400 J 0 SS-23 PFOS 4,910 PFOA 994 J Figure 4 Soil - ng/kg MAP DATE 2017 Aerial 2015

Brick Utilities PFOA Source Trackdown Study

Brick Utilities PFOA Source Trackdown Study NJ Water Monitoring Council January 21, 2016 Robert Karl Source Water Supervisor Acknowledgements Project funded by grant from NJDEP NJDEP Office of Science