Site LOCUS Figure 1 15 Gardner Falls Road Buckland, Massachusetts
44 Wood Avenue · Mansfield, MA
Site LOCUS
½ Mile Radius
20
SCALE IN FEET
200 40
PLAN
1"= 20'
PZ-02
PZ-03
PZ-01HA15-1
HA15-1A(OW)
HA15-2A(OW)
HA15-2(OW)
HA15-3A(OW)
B-1
WL-DS
HA15-5
HA15-7
HA15-8
HA15-6
HA15-4(OW)
HA16-4(OW)
HA16-3(OW)
HA16-1(OW)
HA16-2
A
A
'
CANAL
S
IT
E
A
C
C
E
S
S
R
O
A
D
W
A
Y
NOTES:
1. BASE PLAN OBTAINED FROM PLAN TITLED "0803046 sht
1-5.dwg", DATED 22 JANUARY 2016.
2. ELEVATIONS ARE IN FEET AND REFERENCE A VERTICAL
DATUM SPECIFIC TO THE GARDNER FALLS
HYDROELECTRIC FACILITY SITE.
3. FULL-TIME ON-SITE TECHNICAL MONITORING OF THE
2015 AND 2016 TEST BORINGS WAS PERFORMED BY
HALEY & ALDRICH, INC.
4. LOCATIONS OF 2015 AND 2016 TEST BORINGS WERE
OBTAINED BY HALEY & ALDRICH BY TAPING DISTANCES
FROM EXISTING SITE FEATURES.
5. PLAN LIMITS OF SINKHOLE TAKEN FROM FIGURE C-2 IN
REPORT TITLED "GARDNER FALLS HYDROELECTRIC
PROJECT, FERC 2334, POWERHOUSE STRUCTURAL
ASSESSMENT," PREPARED BY HDR ENGINEERING, INC.
DATED OCTOBER 2014.
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FIGURE 2
UNIT NO. 2 PENSTOCK REPLACEMENT
GARDNER FALLS HYDROELECTRIC FACILITY
BUCKLAND, MASSACHUSETTS
SITE AND SUBSURFACE
EXPLORATION LOCATION PLAN
SCALE: AS SHOWN
JULY 2016
LEGEND:
HA15-1
DESIGNATION AND APPROXIMATE LOCATION OF TEST BORING
DRILLED BY NEW ENGLAND BORING CONTRACTORS (NEBC) OF
LONDONDERRY, NEW HAMPSHIRE DURING THE PERIOD 12 TO 18 JULY
2016 RELATED TO UNIT NO. 2 PENSTOCK REPLACEMENT PROJECT
DESIGNATION AND APPROXIMATE LOCATION OF TEST BORING
DRILLED BY NEBC OF LONDONDERRY, NEW HAMPSHIRE DURING THE
PERIOD 27 MAY TO 9 JUNE 2015 RELATED TO UPSTREAM HYDRAULIC
CUTOFF PROJECT
DESIGNATION AND APPROXIMATE LOCATION OF TEST BORING
DRILLED BY NEBC FOR HDR IN SEPTEMBER 2014 RELATED TO NO. 2
PENSTOCK SINK HOLE DOWNSTREAM OF UNIT 1 & 2 GATEHOUSE
DESIGNATION AND APPROXIMATE LOCATION OF TEST BORING
DRILLED BY KLEINSCHMIDT ASSOCIATES IN 2011 RELATED TO THE
CANAL WALL REPLACEMENT PROJECT
DESIGNATION AND APPROXIMATE LOCATION OF SLOTTED PVC CASING HUNG
FROM SITE FEATURE TO ALLOW WATER LEVEL MEASUREMENTS IN THE RIVER
DOWNSTREAM OF THE POWERHOUSE
GENERAL PLAN LIMITS OF SINKHOLE PER OCTOBER 2014 REPORT BY HDR. SEE
NOTE 5 BELOW
INDICATES OPEN STANDPIPE PIEZOMETER INSTALLED IN COMPLETED
BOREHOLE
INDICATES OBSERVATION WELL INSTALLED IN COMPLETED BOREHOLE
DESIGNATION, ORIENTATION AND APPROXIMATE LOCATION OF SUBSURFACE
PROFILE
PZ-01
B-1
PZ
OW
WL-DS
HA16-1
A A'
HA15-2
(OW)
12.8'S
EL. 315.8'
BOE
@ 29.0'
HA15-1
(OW)
HA16-1
(OW)
BOE
@ 37.6'
HA16-4
(OW)
HA16-2
BOE
@ 37.6'
21.3'S
EL. 334.3'
15.0'N
EL. 315.8'
5.3'N
EL. 315.1'
12.6'N
EL. 318.8'
BOE
@ 49.0'
182
100/2"
150/6"
62
85
44
15
19
4
5/27/16
78%
0%
87%
80%
97%
88%
123/10"
50/2"
126/6"
127/8"
20
7/19/16
76
135
50/2"
20
146/11"
96
61
82
12
55
11
23
11
16
54
7/19/16
7/19/16
*
*
60%
14%
*
87
7/19/16
IN
DS-WL
74%
37%BOE
@ 34.0'
0 10 20
SCALE IN FEET
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FIGURE 3
UNIT NO. 2 PENSTOCK REPLACEMENT
GARDNER FALLS HYDROELECTRIC FACILITY
BUCKLAND, MASSACHUSETTS
SUBSURFACE PROFILE A-A'
SCALE: AS SHOWN
JULY 2016
NOTES:
1. BASE PLAN TAKEN FROM DRAWING TITLED “PLAN AND SECTION GARDNER FALLS POWERHOUSE UNIT NO. 2 TAILRACE
REPAIR PROJECT," DATED 22 JANUARY 2016, PROVIDED BY KLEINSCHMIDT ASSOCIATES.
2. REFER TO FIGURE 2 FOR THE PLAN LOCATION AND ORIENTATION OF THE SUBSURFACE PROFILE; REFER TO
APPENDICES OF REPORT FOR TEST BORING LOGS.
3. THE SUBSURFACE PROFILE DEPICTS THE GENERAL GEOLOGIC CONDITIONS AT THE SITE AND IS BASED ON
INTERPRETATION OF DATA ENCOUNTERED IN THE EXPLORATIONS. LINES REPRESENTING INTERFACES BETWEEN
STRATA ARE BASED ON INTERPOLATION BETWEEN ADJACENT BORINGS. THIS FIGURE SHOWS THE ACTUAL SEQUENCE
OF STRATA ENCOUNTERED AT EACH BORING LOCATION. ACTUAL SOIL CONDITIONS AND INTERFACES BETWEEN
SUBSURFACE EXPLORATIONS MAY VARY SIGNIFICANTLY FROM THOSE INDICATED ON THE PROFILE.
4. ELEVATIONS ARE IN FEET AND REFERENCE A VERTICAL DATUM SPECIFIC TO THE GARDNER FALLS HYDROELECTRIC
FACILITY.
5. EXTENT OF SINKHOLE IS AS SHOWN ON FIGURE C-2 IN REPORT TITLED “GARDNER FALLS HYDROELECTRIC PROJECT,
FERC 2334, POWERHOUSE STRUCTURAL ASSESSMENT”, PREPARED BY HDR ENGINEERING, INC., DATED OCTOBER 2014.
6. INTERPOLATED PHREATIC WATER SURFACE SHOWN IS APPROXIMATE AND WAS ESTIMATED USING RECENT WATER
LEVELS MEASURED IN INSTALLED OBSERVATION WELLS. ACTUAL PHREATIC SURFACE WILL VARY FROM WHAT IS
SHOWN.
31
100/42
LEGENDHA15-1
(OW)
DENOTES BOTTOM OF EXPLORATION AT
APPROXIMATE DEPTH SHOWN
PERCENT RECOVERY/PERCENT ROCK
QUALITY DESIGNATION (RQD)
INTERPRETED GEOLOGIC STRATUM INTERFACE
WATER LEVEL MEASURED IN OBSERVATION WELL ON DATE
SHOWN INTERPOLATED PHREATIC WATER SURFACE FROM
RECENT WATER LEVEL READINGS (SEE NOTE 6)
UNCORRECTED STANDARD PENETRATION TEST
(SPT) N-VALUE (BLOWS PER FOOT)
GROUND SURFACE ELEVATION AT TEST BORING (SEE NOTE 4)
APPROXIMATE PERPENDICULAR OFFSET DISTANCE AND
DIRECTION MEASURED FROM PROFILE LINE
TEST BORING DESIGNATION
(OW - WELL INSTALLED IN COMPLETED BOREHOLES)
12.6'N
EL. 318.8'
7/19/16
BOE
@ 34.0'
Mansfield, MA Amherst, MA Chester, VT www.ohiengineering.com
TABLES
SAMPLE ID RESERVOIR DEWATERDGP
Effluent Limit Units
Solids, Total Suspended 30 mg/l NS 8.4
Chloride mg/l NS 8.22
Chlorine, Total Residual 11 mg/l NS NDpH (H) 6.5-8.3 SU NS 7.8Oil & Grease, Hem-Grav 15 mg/l NS NDChromium, Hexavalent 11.4 µg/l NS ND
Antimony, Total 5.6 µg/l NS NDArsenic, Total 10 µg/l NS NDCadmium, Total 0.2 µg/l NS NDChromium, Total 48.8 µg/l NS NDCopper, Total 5.2 µg/l NS 2.13Iron, Total 1000 µg/l 140 273Lead, Total 1.3 µg/l NS 0.61Mercury, Total 0.9 µg/l NS NDNickel, Total 29 µg/l NS NDSelenium, Total 5 µg/l NS NDSilver, Total 1.2 µg/l NS NDZinc, Total 66.6 µg/l NS ND
ND = Not Detected
Table 1: Groundwater Lab Analysis Summary for DGP Criteria
Gardner Falls Hydroelectric Facility
15 Gardner Falls RoadBuckland, Massachusetts
Daniel O'Connell's Sons, Inc.
Unit No. 2 Tailrace Structure Repair Project
Total Metals
General Chemistry
Anions by Ion Chromatography
General Chemistry
Mansfield, MA Amherst, MA Chester, VT www.ohiengineering.com
APPENDIX A Notice of Intent Form