6804_OrangeCoCDLF_GWMR_DIN27089_20160212

Prepared for:

Prepared for:

Prepared by:

February, 2016
DAA No. R00592-162

ORANGE COUNTY SOLID WASTE MANAGEMENT
(ACTIVE C&D FACILITY)
GROUNDWATER MONITORING PROGRAM
PERMIT NUMBER 68-04

SAMPLING EVENT 21: 11-10-15 + 11-11-15 + 11-12-15
RESULTS OF SAMPLING AND ANALYSIS

ORANGE COUNTY SOLID WASTE MANAGEMENT
P.O. Box 17177
Chapel Hill, North Carolina 27516
Draper Aden Associates
Engineering  Surveying  Environmental Services
8090 Villa Park Drive
Richmond, Virginia 23228
FACILITY PERMIT WELL ID CAS Number SWS ID PARAMETER RESULT UNITS QUALIFIER DILUTION FACTOR COLLECTION DATE EXTRACTION DATE ANALYSIS DATE REGULATORY PROTECTION
STANDARD
SOURCE ANALYSIS*
68-01 6801-MW04 7440-36-0 13 Antimony Total 0.237 ug/L J 1 11/10/2015 11/12/2015 11/16/2015 1 GWPS Naturally occurring; does not exceed SWSL
68-01 6801-MW110D 7440-38-2 14 Arsenic Total 7.92 ug/L J 1 11/10/2015 11/12/2015 11/17/2015 10 2L Naturally occurring; does not exceed SWSL
68-01 6801-MW04 7440-39-3 15 Barium Total 65.5 ug/L J 1 11/10/2015 11/16/2015 11/19/2015 700 2L Naturally occurring; does not exceed SWSL
68-01 6801-MW110S 7440-39-3 15 Barium Total 3.55 ug/L J 1 11/10/2015 11/12/2015 11/17/2015 700 2L Naturally occurring; does not exceed SWSL
68-04 6804-MW204S 7440-39-3 15 Barium Total 32.5 ug/L J 1 11/12/2015 11/19/2015 11/22/2015 700 2L Naturally occurring; does not exceed SWSL
68-04 6804-MW209 7440-39-3 15 Barium Total 38.5 ug/L J 1 11/11/2015 11/19/2015 11/22/2015 700 2L Naturally occurring; does not exceed SWSL
68-04 6804-MW210D 7440-39-3 15 Barium Total 17.3 ug/L J 1 11/12/2015 11/19/2015 11/22/2015 700 2L Naturally occurring; does not exceed SWSL
68-04 6804-MW211R 7440-39-3 15 Barium Total 83.1 ug/L J 1 11/12/2015 11/19/2015 11/22/2015 700 2L Naturally occurring; does not exceed SWSL
68-04 6804-MW211R 7440-41-7 23 Beryllium Total 0.153 ug/L J 1 11/12/2015 11/19/2015 11/22/2015 4 GWPS Naturally occurring; does not exceed SWSL
68-01 6801-MW04 7440-43-9 34 Cadmium Total 0.433 ug/L J 1 11/10/2015 11/16/2015 11/19/2015 2 2L Naturally occurring; does not exceed SWSL
68-01 6801-MW04 SW301 301 Chloride 5900 ug/L 1 11/10/2015 11/16/2015 11/16/2015 250000 2L natural attenuation indicator
68-01 6801-MW110S SW301 301 Chloride 2400 ug/L J 1 11/10/2015 11/16/2015 11/16/2015 250000 2L natural attenuation indicator; does not exceed SWSL
68-04 6804-MW204S SW301 301 Chloride 25000 ug/L 1 11/12/2015 11/17/2015 11/17/2015 250000 2L natural attenuation indicator
68-04 6804-MW209 SW301 301 Chloride 15000 ug/L 1 11/11/2015 11/17/2015 11/17/2015 250000 2L natural attenuation indicator
68-04 6804-MW210D SW301 301 Chloride 18000 ug/L 1 11/12/2015 11/17/2015 11/17/2015 250000 2L natural attenuation indicator
68-04 6804-MW211R SW301 301 Chloride 2500 ug/L J 1 11/12/2015 11/18/2015 11/18/2015 250000 2L natural attenuation indicator; does not exceed SWSL
68-04 6804-MW204S 7440-48-4 53 Cobalt Total 2.47 ug/L J 1 11/12/2015 11/19/2015 11/22/2015 1 GWPS Naturally occurring; does not exceed SWSL; ASD approved 09-26-11
68-04 6804-MW209 7440-48-4 53 Cobalt Total 7.09 ug/L J 1 11/11/2015 11/19/2015 11/22/2015 1 GWPS Naturally occurring; does not exceed SWSL; ASD approved 09-26-11
68-04 6804-MW211R 7440-48-4 53 Cobalt Total 9.51 ug/L J 1 11/12/2015 11/19/2015 11/22/2015 1 GWPS Naturally occurring; does not exceed SWSL; ASD approved 09-26-11
68-04 6804-MW209 7440-50-8 54 Copper Total 7.35 ug/L J 1 11/11/2015 11/19/2015 11/22/2015 1000 2L Naturally occurring; > FBAC (10 ug/l; SWSL)
68-01 6801-MW04 7439-89-6 340 Iron Total 151 ug/L J 1 11/10/2015 11/16/2015 11/19/2015 300 2L Naturally occurring; does not exceed SWSL
68-01 6801-MW110S 7439-89-6 340 Iron Total 356 ug/L 1 11/10/2015 11/12/2015 11/17/2015 300 2L Naturally occurring; ASD approved 08-25-11
68-04 6804-MW204S 7439-89-6 340 Iron Total 197 ug/L J 1 11/12/2015 11/19/2015 11/22/2015 300 2L Naturally occurring; does not exceed SWSL; ASD approved 08-25-11
68-04 6804-MW209 7439-89-6 340 Iron Total 1040 ug/L 1 11/11/2015 11/19/2015 11/22/2015 300 2L Naturally occurring; ASD approved 08-25-11
68-04 6804-MW210D 7439-89-6 340 Iron Total 170 ug/L J 1 11/12/2015 11/19/2015 11/22/2015 300 2L Naturally occurring; does not exceed SWSL; ASD approved 08-25-11
68-04 6804-MW211R 7439-89-6 340 Iron Total 408 ug/L 1 11/12/2015 11/19/2015 11/22/2015 300 2L Naturally occurring; ASD approved 08-25-11
68-01 6801-MW110S 7439-92-1 131 Lead Total 4.07 ug/L J 1 11/10/2015 11/12/2015 11/17/2015 15 2L Naturally occurring; does not exceed SWSL; ASD approved 09-26-11
68-04 6804-MW209 7439-92-1 131 Lead Total 3.95 ug/L J 1 11/11/2015 11/19/2015 11/22/2015 15 2L Naturally occurring; does not exceed SWSL; ASD approved 09-26-11
68-01 6801-MW04 7439-96-5 342 Manganese Total 4.52 ug/L BJ 1 11/10/2015 11/16/2015 11/19/2015 50 2L Naturally occurring; byproduct of potassium permanganate breakdown; does not exceed SWSL
68-01 6801-MW110S 7439-96-5 342 Manganese Total 7.71 ug/L J 1 11/10/2015 11/12/2015 11/17/2015 50 2L Naturally occurring; byproduct of potassium permanganate breakdown; does not exceed SWSL; ASD approved 08-25-11
68-04 6804-MW204S 7439-96-5 342 Manganese Total 320 ug/L 1 11/12/2015 11/19/2015 11/22/2015 50 2L Naturally occurring; byproduct of potassium permanganate breakdown; ASD approved 08-25-11
68-04 6804-MW209 7439-96-5 342 Manganese Total 365 ug/L 1 11/11/2015 11/19/2015 11/22/2015 50 2L Naturally occurring; byproduct of potassium permanganate breakdown; ASD approved 08-25-11
68-04 6804-MW210D 7439-96-5 342 Manganese Total 719 ug/L 1 11/12/2015 11/19/2015 11/22/2015 50 2L Naturally occurring; byproduct of potassium permanganate breakdown; ASD approved 08-25-11
68-04 6804-MW211R 7439-96-5 342 Manganese Total 1810 ug/L 1 11/12/2015 11/19/2015 11/22/2015 50 2L Naturally occurring; byproduct of potassium permanganate breakdown; ASD approved 08-25-11
68-04 6804-MW209 7439-97-6 132 Mercury Total 0.223 ug/L 1 11/11/2015 11/19/2015 11/20/2015 1 2L Naturally occurring
68-04 6804-MW211R 7439-97-6 132 Mercury Total 0.229 ug/L 1 11/12/2015 11/19/2015 11/20/2015 1 2L Naturally occurring
68-04 6804-MW209 7782-49-2 183 Selenium Total 3.09 ug/L J 1 11/11/2015 11/19/2015 11/20/2015 20 2L natural attenuation indicator; does not exceed SWSL
68-04 6804-MW204S 14808-79-8 315 Sulfate as SO4 16000 ug/L J 1 11/12/2015 11/17/2015 11/17/2015 250000 2L natural attenuation indicator; does not exceed SWSL
68-04 6804-MW209 14808-79-8 315 Sulfate as SO4 38000 ug/L J 1 11/11/2015 11/17/2015 11/17/2015 250000 2L natural attenuation indicator; does not exceed SWSL
68-04 6804-MW210D 14808-79-8 315 Sulfate as SO4 19000 ug/L J 1 11/12/2015 11/17/2015 11/17/2015 250000 2L natural attenuation indicator; does not exceed SWSL
68-04 6804-MW211R 14808-79-8 315 Sulfate as SO4 4000 ug/L J 1 11/12/2015 11/18/2015 11/18/2015 250000 2L natural attenuation indicator; does not exceed SWSL
68-01 6801-MW04 SW337 337 Total Alkalinity as CaCO3 21000 ug/L 1 11/10/2015 11/20/2015 11/20/2015 N/A N/A natural attenuation indicator
68-01 6801-MW110S SW337 337 Total Alkalinity as CaCO3 28000 ug/L 1 11/10/2015 11/20/2015 11/20/2015 N/A N/A natural attenuation indicator
68-04 6804-MW204S SW337 337 Total Alkalinity as CaCO3 280000 ug/L 1 11/12/2015 11/20/2015 11/20/2015 N/A N/A natural attenuation indicator
68-04 6804-MW209 SW337 337 Total Alkalinity as CaCO3 78000 ug/L 1 11/11/2015 11/20/2015 11/20/2015 N/A N/A natural attenuation indicator
68-04 6804-MW210D SW337 337 Total Alkalinity as CaCO3 180000 ug/L D 2 11/12/2015 11/20/2015 11/20/2015 N/A N/A natural attenuation indicator
68-04 6804-MW211R SW337 337 Total Alkalinity as CaCO3 34000 ug/L 1 11/12/2015 11/24/2015 11/24/2015 N/A N/A natural attenuation indicator
68-01 6801-MW110S SW311 311 Total Dissolved Solids 50000 ug/L 1 11/10/2015 11/12/2015 11/12/2015 500000 2L Naturally occurring
68-04 6804-MW204S SW311 311 Total Dissolved Solids 380000 ug/L 1 11/12/2015 11/16/2015 11/16/2015 500000 2L Naturally occurring
68-04 6804-MW209 SW311 311 Total Dissolved Solids 190000 ug/L 1 11/11/2015 11/16/2015 11/16/2015 500000 2L Naturally occurring
68-04 6804-MW210D SW311 311 Total Dissolved Solids 270000 ug/L 1 11/12/2015 11/16/2015 11/16/2015 500000 2L Naturally occurring
68-01 6801-MW04 7440-62-2 209 Vanadium Total 1.60 ug/L J 1 11/10/2015 11/16/2015 11/19/2015 0.3 GWPS Naturally occurring; does not exceed SWSL
68-01 6801-MW110S 7440-62-2 209 Vanadium Total 1.51 ug/L J 1 11/10/2015 11/12/2015 11/17/2015 0.3 GWPS Naturally occurring; does not exceed SWSL; ASD approved 09-26-11
68-04 6804-MW209 7440-62-2 209 Vanadium Total 3.26 ug/L J 1 11/11/2015 11/19/2015 11/22/2015 0.3 GWPS Naturally occurring; does not exceed SWSL; ASD approved 09-26-11
68-01 6801-MW04 7440-66-6 213 Zinc Total 7.09 ug/L J 1 11/10/2015 11/16/2015 11/19/2015 1000 2L Naturally occurring; does not exceed SWSL
68-04 6804-MW209 7440-66-6 213 Zinc Total 36.8 ug/L 1 11/11/2015 11/19/2015 11/22/2015 1000 2L Naturally occurring
68-04 6804-MW211R 7440-66-6 213 Zinc Total 21.0 ug/L 1 11/12/2015 11/19/2015 11/22/2015 1000 2L Naturally occurring
B - concentration is <5x constituent concentration detected in associated blank
SPL - Statistical Prediction Limit
ASD - Alternate Source Demonstration
FBAC - Facility Background concentration
Bold italicized values exceed their respective regulatory protection standard and section limit.
* Note: These analyses should be interpreted in the context of the groundwater sampling report for this event.
Yellow highlighted well indicates upgradient location
J - constituent was less than its Solid Waste Section Limit (SWSL)
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
FACILITY: ACTIVE C&D LANDFILL
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM
DATES OF SAMPLING: 11/10/15 + 11/11/15 + 11/12/15
GROUNDWATER CONSTITUENTS ATTAINING OR EXCEEDING THEIR GROUNDWATER QUALITY STANDARDS

ATTACHMENTS

1 FIGURES

2 MONITORING WELL NETWORK

3 GROUNDWATER ELEVATION DATA

4 GROUNDWATER VELOCITY CALCULATIONS

5 ORGANIC CONSTITUENTS

6 INORGANIC CONSTITUENTS

7 LABORATORY CERTIFICATE-OF-ANALYSIS

8 FIELD DATA

9 STATISTICAL ANALYSES

10 QUALITY CONTROL ASSESSMENT

11 CORRESPONDENCE

ATTACHMENT 1

FIGURES

LEGEND

N

SOURCE: USGS 7.5’ Quadrangle
Chapel Hill, NC
2013
Vicinity Topographic Map
Client Orange County Solid Waste Management
Facility North + South + Active C&D Landfills
Location Chapel Hill, North Carolina
Project Environmental Monitoring Programs
SCALE:

DAA NO.
[not shown]

R00597
DESIGNED
DRAWN
CHECKED
DATE
LNF
BHH
LNF
02-14-14
FIGURE
1A

approximate locations of facilities
active
C&D
old
C&D
North
South office

LEGEND

N

SOURCE: Google Earth
[image date 04-09-13]
Vicinity Aerial Photograph
Client Orange County Solid Waste Management
Facility North + South + Active C&D Landfills
Location Chapel Hill, North Carolina
Project Environmental Monitoring Programs
SCALE:

DAA NO.
[not shown]

R00597
DESIGNED
DRAWN
CHECKED
DATE
LNF
BHH
LNF
02-13-14
FIGURE
1B

approximate locations of facilities
old
C&D
North
South
active
C&D

ATTACHMENT 2

MONITORING WELL NETWORK

ATTACHMENT 2

GROUNDWATER MONITORING NETWORK

The well monitoring network associated with the active C&D landfill consists of seven wells:

Upgradient: 6804-211R

Downgradient: 6804-MW204S
6804-MW209
6804-MW210D

6801-MW4

6801-MW110S
6801-MW110D

Note. Well 6801-MW4 is associated with both the C&D landfill and the North sanitary landfill.

Note. Well 6801-MW110S and 6801-MW110D are hydrogeologically upgradient of South landfill
(and serve as background wells for that waste management unit), but hydrogeologically
downgradient of the C&D landfill.

NORTH SOUTH ACTIVE
Well LANDFILL LANDFILL C&D LANDFILL
6801-MW-04 X X
6801-MW-06R X
6801-MW-07R X
6801-MW-14A X
6801-MW-14B X
6801-MW-15 X
6801-MW-16 X
6801-MW-17 X
6801-MW-20 X
6801-MW-21D X
6801-MW-21S X
6801-MW-22 X
6801-MW-23 X
6801-MW-24 X
6801-MW101 X
6801-MW102DR X
6801-MW102S X
6801-MW103D X
6801-MW103S X
6801-MW104 X
6801-MW105 X
6801-MW106 X
6801-MW107 X
6801-MW110D X X
6801-MW110S X X
6801-MW111 X
6801-MW112 X
6804-MW204S X
6804-MW209 X
6804-MW210D X
6804-MW211R X
6801-SW1 X
6801-SW2 X
Leachate X
6804-SW1 X
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
FACILITY: ACTIVE C&D LANDFILL
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM
MONITORING WELL NETWORK SUMMARY
total depth depth measured elevation elevation
drilling diameter depth to top to top well ground measuring point
well type of date drilling method borehole borehole sand bentonite depth*stickup surface (top of PVC wellpipe)
designation well completed contractor (inches)northing easting (inches)(feet)(feet)(feet)(feet)(feet)(feet)(feet)
MW-201 2MW10 07-14-99 B&C 3.25" HSA 806738.265 1973582.765 7.3 17 7 5 19.64 2.64 529.12 531.76
MW-201R 2MW20 03-24-09 RSD 6" AR 806742.35 1973579.11 6.0 45 18 15 42.00 2.00 529.05 531.05
MW-204S 2MW10 07-14-99 B&C 3.25" HSA 807934.258 1974171.705 7.3 21 9 6 23.01 2.01 515.78 517.79
MW-204D 2MW10 07-25-99 B&C 3.25" HSA 807930.545 1974167.211 7.3 50 16 14 52.64 2.64 516.99 519.63
MW-209 2MW10 07-24-99 B&C 3.25" HSA 807822.942 1974736.071 7.3 22 12 10 24.02 2.02 513.77 515.79
MW-210 2MW15 07-15-99 B&C 3.25" HSA 807857.410 1973848.881 7.3 21 4 2 23.80 2.80 522.48 525.28
MW-210D 2MW10 06-03-13 DDI 6" AR 807854.000 1973854.600 6.0 31.7 19 15 34.74 3.04 520.76 523.8
MW-211R 2MW10 04-28-05 G&C 4" air rotary 807277.338 1973737.408 4.0 40 20 17 43.25 3.25 536.36 539.61
MW-214R 2MW20 04-28-05 G&C 4" air rotary 807775.501 1974252.456 4.0 35 16 14 38.08 3.08 522.97 526.05
MW-4 1.75MW10 10-31-80 SME 3.25" HSA 807250.43 1974944.46 6.0 53 39 38 53.00 2.33 547.66 549.99
MW-110S 2MW15 03-21-95 BED 6" AR 807019.111 1974956.860 6.0 40 18 16 42.33 2.33 537.91 540.24
MW-110D 2MW15 03-21-95 BED 6" AR 807026.571 1974966.137 6.0 70 55 53 72.30 2.30 537.88 540.18
stick-up = elevation of measuring point - elevation of ground surface
* relative to measuring point
B&C = Bore & Core, Inc. = well abandoned
DDI = Davidson Drilling, Inc.
G&C = Graham & Currie
BED = Bedford Well Drilling, Inc.
RSD = Richard Simmons Drilling, Inc.
SME = S&ME, Inc.

wellspecs.r00592 C&D LF.xlsx
ACTIVE C&D LANDFILL WELLS
NORTH LANDFILL WELLS
SOUTH LANDFILL WELLS
WELL CONSTRUCTION DATA
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
FACILITY: ACTIVE C&D FACILITY
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM

ATTACHMENT 3

GROUNDWATER ELEVATION DATA
ATTACHMENT 3

GROUNDWATER ELEVATION DATA

The elevation of the water table in the uppermost aquifer (that is, excluding “deep” wells where
clustered wells are present) during the subject sampling event was found to vary from a high of
521.81 feet above mean sea level (monitoring well 6804-MW211R) to a low of 508.26 feet above
mean sea level (monitoring well 6804-MW204S). A history of static water elevations is presented at
the end of this ATTACHMENT.

A comparison of static water elevations obtained during the referenced sampling event with
those obtained during prior sampling events reveals no hydrogeologically significant changes in
directions of groundwater flow.
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
FACILITY: ACTIVE C&D FACILITY
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM
STATIC WATER LEVELS
DATE: 11-10-15 + 11-11-15 + 11-12-15
WELL ELEVmp DTW STICKUP DTWc ELEVgs ELEVgw
6801-MW4 549.99 32.32 2.33 29.99 547.66 517.67
6801-MW110 S 540.24 22.96 2.33 20.63 537.91 517.28
6801-MW110 D 540.18 29.91 2.30 27.61 537.88 510.27
6804-MW204 S 517.99 9.73 2.01 7.72 515.78 508.26
6804-MW204 D 517.75 2.64 516.69
6804-MW209 515.95 2.65 2.02 0.63 513.77 513.30
6804-MW210 D 523.80 8.83 3.04 5.79 520.76 514.97
6804-MW211 R 539.49 17.68 3.25 14.43 536.24 521.81
Elevations expressed in feet above mean sea level.
Shaded cells indicate data not available
R00592-162
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
FACILITY: ACTIVE C&D FACILITY
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM
HISTORY OF STATIC WATER ELEVATIONS
DATE MW-04 MW-05 MW-110S MW-110D MW-201R MW-204S MW-204D MW-209 MW-210 MW-210D MW-211R
ELEVgs 547.66 522.04 537.91 537.88 529.05 515.78 516.69 513.77 522.48 520.76 536.24
ELEVmp 549.99 523.79 540.24 540.18 531.05 517.99 517.75 515.95 525.17 523.80 539.49
01/03/90 521.61 511.79
04/16/90 523.57 511.66
07/17/90 521.28 506.25
10/29/90 516.65 506.29
01/30/91 518.32 510.41
07/11/91 518.74 506.29
11/14/91 515.07 505.37
05/28/92 516.82 507.62
10/27/92 514.24 505.71
02/23/93 516.82 512.29
06/30/93 520.07 506.37
10/28/93 516.67
01/24/94 516.76 509.97
09/21/94
11/03/94 516.84
12/20/94 516.14 505.78
02/02/95 516.39 505.87
03/13/95 518.02 511.67
03/22/95 512.47 511.13
05/09/95 515.55 509.51
05/18/95 515.39 509.55
07/20/95 516.99 511.08
11/15/95 518.59 509.87
11/28/95 517.31 511.56
02/28/96 520.92 513.65
07/25/96 521.56 505.90
08/07/96 516.69 510.25
08/27/96 515.82 509.34
02/25/97 521.62 511.38 521.55 509.63
09/03/97 519.74 505.84 515.04 507.83
03/25/98 522.77 515.28
05/04/98 524.30 509.76
11/02/98 518.27 504.69 512.93 506.83
04/26/99 519.63 507.19 517.68 511.18
11/22/99 520.70 509.25 517.79 511.26
05/23/00 522.28 509.95 520.63 512.90
11/29/00 518.42 508.48 515.74 508.97
05/30/01 518.04 510.93
06/05/01 519.57 510.52
11/13/01 515.86 506.39 512.84 506.48
06/04/02 515.89 507.87 513.69 507.23
03/13/03 518.74 513.07 519.74 513.23
06/19/03 521.57 514.49 522.04 514.55
12/08/03 519.49 514.04 517.09 510.37
06/22/04 519.56 508.38 517.35 501.48
11/30/04 518.09 512.51 517.64 510.40
06/01/05 518.43 509.88
06/06/05 518.52 510.78
11/02/05 515.43 507.17 512.62 505.66
11/09/05 504.69 509.12 510.91 510.74
05/23/06 516.59 515.04 507.89 509.22 512.46 512.57 515.74
11/17/06 515.12 513.38 512.63 507.07 507.42 513.33 513.20 512.75
06/14/07 517.85 509.06 516.41 508.56 508.27 512.16 512.90 515.81
12/12/07 512.44 512.02 510.13 503.69 504.54 507.64 510.43 508.23
06/11/08 515.55 510.20 514.63 507.73 507.78 511.80 511.89 514.95
11/06/08 514.54 509.48 513.28 506.27 506.59 510.77 512.62 512.80
05/20/09 517.14 512.14 516.76 509.70 510.93 513.84 513.00 516.86
11/19/09 514.85 511.55 513.57 507.46 508.93 507.04 512.17 513.29 510.99
06/24/10 518.72 510.98 516.37 509.58 512.12 509.49 512.65 513.03 515.54
11/17/10 515.04 509.85 513.04 505.93 504.73 505.19 509.83 512.68 509.89
05/24/11 516.54 511.91 515.29 508.66 510.38 509.90 513.34 512.98 515.92
11/17/11 513.17 511.10 504.68 504.84 509.56 512.80 510.10
06/05/12 516.81 515.52 509.06 509.94 513.56 513.09 516.51 520.67
11/12/12 515.97 513.66 506.66 507.72 512.90 514.01 518.50
05/13/13 517.75 517.04 510.85 513.24 513.41 518.53 522.04
11/11/13 518.54 516.72 509.15 511.36 513.24 516.82 519.88
05/13/14 521.11 521.52 512.58 515.42 513.41 519.58 526.40
11/11/14 516.49 514.27 506.98 506.32 512.93 513.05 517.30
05/12/15 520.04 519.42 511.92 513.61 512.70 518.10 524.17
11/10/15 517.67 517.28 510.27 508.26 513.30 514.97 521.81
MIN 512.44 504.69 510.13 501.48 504.73 504.54 507.64 510.43 508.23 513.05 517.30
MAX 524.30 514.49 522.77 515.28 512.12 515.42 513.84 513.41 518.53 519.58 526.40
MEAN 517.96 509.35 516.27 509.26 509.04 508.66 511.59 512.73 513.71 516.50 521.35
RANGE 11.86 9.80 12.64 13.80 7.39 10.88 6.20 2.98 10.30 6.53 9.10
STD 2.51 2.64 2.93 2.77 2.73 2.95 1.84 0.75 2.90 2.30 2.77
Elevations expressed in feet above mean sea level.
Upgradient wells shaded yellow.
All SWE data have been corrected to survey data obtained during May, 1999.
ELEV-mp and ELEV-gs derived from survey performed during May, 1999.
R00592-162
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Date
OCSWM -ACTIVE C&D FACILITY
STATIC WATER ELEVATIONS
MW-04 MW-110S MW-211R
506
508
510
512
514
516
518
520
El
e
v
a
t
i
o
n

(
f
e
e
t

a
b
o
v
e

s
e
a

l
e
v
e
l
)
Date
OCSWM -ACTIVE C&D FACILITY
STATIC WATER ELEVATIONS
MW-204D MW-209 MW-210
500
502
504
506
508
510
512
514
516
El
e
v
a
t
i
o
n

(
f
e
e
t

a
b
o
v
e

s
e
a

l
e
v
e
l
)
Date
OCSWM -ACTIVE C&D FACILITY
STATIC WATER ELEVATIONS
MW-05 MW-110D MW-201R MW-204S
500
505
510
515
520
525
El
e
v
a
t
i
o
n

(
f
e
e
t

a
b
o
v
e

s
e
a

l
e
v
e
l
)
Date
OCSWM -ACTIVE C&D FACILITY
STATIC WATER ELEVATIONS -WELL CLUSTER MW-110
MW-110S MW-110D
direction of
vertical
gradient
500
505
510
515
520
525
El
e
v
a
t
i
o
n

(
f
e
e
t

a
b
o
v
e

s
e
a

l
e
v
e
l
)
Date
OCSWM -ACTIVE C&D FACILITY
STATIC WATER ELEVATIONS -WELL CLUSTER MW-204
MW-204S MW-204D
direction of
vertical
gradient

ATTACHMENT 4

GROUNDWATER VELOCITY CALCULATIONS

[BASED ON DATA PRESENTED IN ATTACHMENT 3]

ATTACHMENT 4

GROUNDWATER VELOCITY CALCULATIONS

The rate of at which constituents are transported in groundwater may be conservatively estimated
by the velocity of groundwater flow. We shall distinguish between the apparent Darcy groundwater
flow velocity (Vd) and seepage velocity (Vs), which are given by the equations:

Vd = ki

and

Vs = kin-1,

where:

Vd = Darcy velocity
Vs = seepage velocity
k = hydraulic conductivity
i = hydraulic gradient
n = porosity

On June 3, 2013, DAA personnel conducted a falling head slug test on well MW-210D to determine
the hydraulic conductivity of the aquifer at that location.

Data were captured using a Solinst LevelLogger. Data were analyzed using the Bouwer-Rice
method, with Aquifer Test Pro software.

The hydraulic conductivity of the aquifer at that location is 8.32 x 10-5 cm/second.

Based upon textural assessment, effective porosity of the uppermost aquifer is estimated to be about
0.25 (unitless).

Using groundwater elevations measured during the subject sampling event, the hydraulic gradient
of the uppermost aquifer was calculated along the flow path from well 6804-MW211R to well 6804-
MW209.

The average hydraulic gradient was estimated by dividing the difference between the hydraulic
heads (elevation heads) in well 6804-MW211R to well 6804-MW209 by the distance between
those two wells (about 1,137 feet).

Using groundwater elevations measured during the subject sampling event, the velocity of
groundwater was calculated along the flow path from well 6804-MW211R to well 6804-MW209.

Groundwater Velocity Calculations
Page 2

Calculated velocities are presented on the accompanying table. A comparison of
groundwater velocity based upon the subject sampling event (2.58 feet/year) with those
obtained during prior sampling events indicates that the velocity observed during the subject
sampling event is approximately 6% greater than the median velocity (2.44 feet/year), along
the selected flow path.

We note that the calculated groundwater velocity along a given flow path represents an average
velocity along one of many potential flow paths, in the uppermost aquifer underlying the area of
interest. Nonetheless, the velocity estimate is believed to be reasonably representative of that area.
from …… toward meters/meter meters/yr feet/yr
date upgradient location upgradient SWE
downgradient
location downgradient SWE gradient GW velocity GW velocity
06/05/12 6804-MW211R 520.67 6804-MW209 513.09 6.67E-03 0.7 2.30
11/12/12 6804-MW211R 518.50 6804-MW209 512.90 4.93E-03 0.5 1.70
05/13/13 6804-MW211R 522.04 6804-MW209 513.41 7.59E-03 0.8 2.61
11/11/13 6804-MW211R 519.88 6804-MW209 513.24 5.84E-03 0.6 2.01
05/13/14 6804-MW211R 526.40 6804-MW209 513.41 1.14E-02 1.2 3.93
11/12/14 6804-MW211R 517.30 6804-MW209 512.93 3.84E-03 0.4 1.32
05/13/15 6804-MW211R 524.17 6804-MW209 512.70 1.01E-02 1.1 3.47
11/10/15 6804-MW211R 521.81 6804-MW209 513.30 7.48E-03 0.8 2.58
hydraulic conductivity = 8.32 E-5 cm/second median = 0.74 2.44
distance = 1,137 feet deviation from mean = 5.8%
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
FACILITY: ACTIVE C&D FACILITY
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM
GROUNDWATER VELOCITY CALCULATIONS
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
fe
e
t

/

y
e
a
r
date measured
GROUNDWATER VELOCITY: MW211R TOWARD MW209
median

ATTACHMENT 5

SUMMARY OF ORGANIC CONSTITUENTS

ATTACHMENT 5

ORGANIC CONSTITUENTS

During November 10, November 11, and November 12, 2015 (sampling event 21), Sherrill
Environmental personnel obtained groundwater samples from seven groundwater monitoring wells
at the Orange County Solid Waste Management Active C&D Facility.

During event 21, the laboratory did not detect any organic constituents.

Recommended Actions. In accordance with the current Groundwater Monitoring Plan (approved
May 23, 2012) for the active C&D landfill, the facility should:
 continue semi-annual and annual sampling of all permitted wells associated solely with the
active C&D landfill (6804-MW204S, 6804-MW209, 6804-MW210, 6804-MW211R) for all
constituents listed in Appendix I (40 CFR Part 258), mercury, chloride, manganese, sulfate,
iron, specific conductance, pH, temperature, alkalinity, and total dissolved solids (TDS)
 continue semi-annual and annual sampling of permitted well 6801-MW4, shared between
the active C&D landfill and the existing North sanitary landfill area, for all constituents
listed in Appendix I, mercury, chloride, manganese, sulfate, iron, specific conductance,
pH, temperature, alkalinity, and total dissolved solids (TDS)
 continue semi-annual and annual sampling of permitted well 6801-MW110S, shared
between the active C&D landfill and the existing South sanitary landfill areas, for all
constituents listed in Appendix I, mercury, chloride, manganese, sulfate, iron, specific
conductance, pH, temperature, alkalinity, and total dissolved solids (TDS)

Well 6801-MW4 is associated with both the C&D landfill and the North sanitary landfill. In
accordance with the approved Groundwater Monitoring Plan pertaining to the North sanitary
landfill, the facility shall:
 continue semi-annual and annual sampling of permitted well 6801-MW4 for any
constituents listed in Appendix II that have previously been detected in groundwater at the
North sanitary landfill (mercury, naphthalene, sulfide)

Well 6801-MW110D serves as a background well for the South landfill, but appears to be
hydrogeologically downgradient of the C&D landfill. Accordingly, the facility shall:
 continue semi-annual and annual sampling of well 6801-MW110D and analyze it for total
arsenic
acetone 04/17/90
MCL = 07/11/91
FBAC = 100 (SWSL)05/28/92
NCGQS = 6000 (2L Std)06/30/93
2L Std = 700 (pre- Jan. 2010)11/04/94
2L Std = 6000 (Jan. 2010)12/20/94
02/02/95
03/13/95
11/15/95
07/25/96
02/25/97
09/03/97
05/04/98
11/02/98
04/26/99
11/22/99
05/23/00
11/29/00
06/05/01
11/13/01
06/04/02
03/12/03
06/18/03
12/08/03
06/22/04
11/30/04
06/01/05
11/02/05
11/09/05
05/23/06
11/17/06
06/13/07
12/12/07
06/09/08
06/17/08 412 J 1.2 100 ic, cc
11/06/08 <1.2 106 S <1.2 <1.2 <1.2 <1.2 <1.2 <1.2 1.2 100 t, f
05/20/09 <1.5 61 J <1.5 <1.5 <1.5 <1.5 <1.5 <1.5 <1.5 1.5 100
11/19/09 <1.5 300 <1.5 <1.5 <1.5 <1.5 <1.5 <1.5 <1.5 1.5 100
06/23/10 <1.5 <1.5 <1.5 <1.5 <1.5 <1.5 <1.5 <1.5 <1.5 1.5 100
11/17/10 <1.5 16 J <1.5 <1.5 <1.5 <1.5 <1.5 <1.5 3.2 J 1.5 100
05/24/11 <1.2 120 <1.2 <1.2 <1.2 <1.2 <1.2 <1.2 <1.2 1.2 100
11/17/11 <1.2 <1.2 <1.2 <1.2 <1.2 <1.2 <1.2 <1.2 1.2 100
06/05/12 <1.2 <1.2 <1.2 <1.2 <1.2 <1.2 <1.2 <1.2 1.2 100
11/14/12 <1.2 <1.2 <1.2 <1.2 <1.2 <1.2 1.2 100
05/13/13 <1.2 <1.2 <1.2 <1.2 <1.2 <1.2 1.2 100
11/12/13 <1.2 <1.2 <1.2 <1.2 <1.2 <1.2 1.2 100
05/13/14 <1.2 <1.2 <1.2 <1.2 <1.2 <1.2 1.2 100
11/11/14 <1.2 <1.2 <1.2 <1.2 <1.2 <1.2 1.2 100
05/13/15 <1.2 <1.2 <1.2 <1.2 <1.2 <1.2 1.2 100
11/10/15 <1.2 <1.2 <1.2 <1.2 <1.2 <1.2 1.2 100
average = -210.00 ---------
standard deviation = -----------
MW-209 MW-210D LOD SWSL QA/QCMW-5 MW-110S MW-110D MW-204S MW-204D MW-211R
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
FACILITY: ACTIVE C&D FACILITY
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM
HISTORY OF CHEMICAL ANALYSIS
MW-201R
ORGANIC CONSTITUENTS
Constituent Sample
Date MW-4 MW-210
benzene 04/17/90
MCL = 5 07/11/91
FBAC = 1 (SWSL)05/28/92
NCGQS = 1 (2L Std)06/30/93
11/04/94
12/20/94
02/02/95
03/13/95
11/15/95
07/25/96
02/25/97
09/03/97
05/04/98
11/02/98
04/26/99
11/22/99
05/23/00
11/29/00
06/05/01
11/13/01
06/04/02
03/12/03
06/18/03
12/08/03
06/22/04
11/30/04
06/01/05
11/02/05
11/09/05
05/23/06
11/17/06
06/13/07
12/12/07
06/09/08
06/17/08 0.7 J 0.1 1 ic, cc
11/06/08 <0.1 0.8 J <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 0.1 1
05/20/09 <0.2 1.1 <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 0.2 1
11/19/09 <0.2 1.2 <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 0.2 1
06/23/10 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 0.05 1
11/17/10 <0.2 1.6 <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 0.2 1
05/24/11 <0.68 <0.68 <0.68 <0.68 <0.68 <0.68 <0.68 <0.68 <0.68 0.68 1
11/17/11 <0.68 <0.68 <0.68 <0.68 <0.68 <0.68 <0.68 <0.68 0.68 1
06/05/12 <0.15 <0.15 <0.15 <0.15 <0.15 <0.15 <0.15 <0.15 0.15 1
11/14/12 <0.15 <0.15 <0.15 <0.15 <0.15 <0.15 0.15 1
05/13/13 <0.15 <0.15 <0.15 <0.15 <0.15 <0.15 0.15 1
11/12/13 <0.15 <0.15 <0.15 <0.15 <0.15 <0.15 0.15 1
05/13/14 <0.15 <0.15 <0.15 <0.15 <0.15 <0.15 0.15 1
11/11/14 <0.15 <0.15 <0.15 <0.15 <0.15 <0.15 0.15 1
05/13/15 <0.15 <0.15 <0.15 <0.15 <0.15 <0.15 0.15 1
11/10/15 <0.15 <0.15 <0.15 <0.15 <0.15 <0.15 0.15 1
average = -1.30 ---------
standard deviation = -0.26 ---------
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM
HISTORY OF CHEMICAL ANALYSIS
ORGANIC CONSTITUENTS
Constituent Sample
Date MW-4 MW-5
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
FACILITY: ACTIVE C&D FACILITY
MW-204DMW-110S MW-110D MW-209 MW-210D QA/QCMW-204S LOD SWSLMW-201R MW-211RMW-210
2-butanone 04/17/90
MCL = 07/11/91
FBAC = 100 (SWSL)05/28/92
NCGQS = 4000 (2L Std)06/30/93
2L Std = 4200 (pre- Jan. 2010)11/04/94
2L Std = 4000 (Jan. 2010)12/20/94
02/02/95
03/13/95
11/15/95
07/25/96
02/25/97
09/03/97
05/04/98
11/02/98
04/26/99
11/22/99
05/23/00
11/29/00
06/05/01
11/13/01
06/04/02
03/12/03
06/18/03
12/08/03
06/22/04
11/30/04
06/01/05
11/02/05
11/09/05
05/23/06
11/17/06
06/13/07
12/12/07
06/09/08
06/17/08 3.3 J 0.9 100 ic, cc
11/06/08 <0.9 1 J <0.9 <0.9 <0.9 <0.9 <0.9 <0.9 0.9 100
05/20/09 <1 <1 <1 <1 <1 <1 <1 <1 <1 1 100
11/19/09 <1 2.3 J <1 <1 <1 <1 <1 <1 <1 1 100
06/23/10 <1 <1 <1 <1 <1 <1 <1 <1 <1 1 100
11/17/10 <1 <1 <1 <1 <1 <1 <1 <1 <1 1 100
05/24/11 <1.3 <1.3 <1.3 <1.3 <1.3 <1.3 <1.3 <1.3 <1.3 1.3 100
11/17/11 <1.3 <1.3 <1.3 <1.3 <1.3 <1.3 <1.3 <1.3 1.3 100
06/05/12 <1.3 <1.3 <1.3 <1.3 <1.3 <1.3 <1.3 <1.3 1.3 100
11/14/12 <1.3 <1.3 <1.3 <1.3 <1.3 <1.3 1.3 100
05/13/13 <1.3 <1.3 <1.3 <1.3 <1.3 <1.3 1.3 100
11/12/13 <1.3 <1.3 <1.3 <1.3 <1.3 <1.3 1.3 100
05/13/14 <1.3 <1.3 <1.3 <1.3 <1.3 <1.3 1.3 100
11/11/14 <1.3 <1.3 <1.3 <1.3 <1.3 <1.3 1.3 100
05/13/15 <1.3 <1.3 <1.3 <1.3 <1.3 <1.3 1.3 100
11/10/15 <1.3 <1.3 <1.3 <1.3 <1.3 <1.3 1.3 100
average = -----------
standard deviation = -----------
MW-211R LOD SWSL
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
FACILITY: ACTIVE C&D FACILITY
QA/QCMW-5 MW-204S MW-209 MW-210DMW-204DConstituentSample
Date MW-4
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM
HISTORY OF CHEMICAL ANALYSIS
ORGANIC CONSTITUENTS
MW-110S MW-110D MW-210MW-201R
carbon disulfide 04/17/90
MCL = 07/11/91
FBAC = 100 (SWSL)05/28/92
NCGQS = 700 06/30/93
11/04/94
12/20/94
02/02/95
03/13/95
11/15/95
07/25/96
02/25/97
09/03/97
05/04/98
11/02/98
04/26/99
11/22/99
05/23/00
11/29/00
06/05/01
11/13/01
06/04/02
03/12/03
06/18/03
12/08/03
06/22/04
11/30/04
06/01/05
11/02/05
11/09/05
05/23/06
11/17/06
06/13/07
12/12/07
06/09/08
06/17/08 6 J 0.5 100 ic, cc
11/06/08 <0.5 4.5 J <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 0.5 100
05/20/09 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 0.5 100
11/19/09 <0.54 <0.54 <0.54 <0.54 <0.54 <0.54 <0.54 <0.54 <0.54 0.54 100
06/23/10 <0.54 <0.54 <0.54 <0.54 <0.54 <0.54 <0.54 <0.54 <0.54 0.54 100
11/17/10 <0.54 <0.54 <0.54 <0.54 <0.54 <0.54 <0.54 <0.54 <0.54 0.54 100
05/24/11 <1.5 <1.5 <1.5 <1.5 <1.5 <1.5 <1.5 <1.5 <1.5 1.5 100
11/17/11 <1.5 <1.5 <1.5 <1.5 <1.5 <1.5 <1.5 <1.5 1.5 100
06/05/12 <1.5 <1.5 <1.5 <1.5 <1.5 <1.5 <1.5 <1.5 1.5 100
11/14/12 <1.5 <1.5 <1.5 <1.5 <1.5 <1.5 1.5 100
05/13/13 <1.5 <1.5 <1.5 <1.5 <1.5 <1.5 1.5 100
11/12/13 <1.5 <1.5 <1.5 <1.5 <1.5 <1.5 1.5 100
05/13/14 <1.5 <1.5 <1.5 <1.5 <1.5 <1.5 1.5 100
11/11/14 <1.5 <1.5 <1.5 <1.5 <1.5 <1.5 1.5 100
05/13/15 <1.5 <1.5 <1.5 <1.5 <1.5 <1.5 1.5 100
11/10/15 <1.5 <1.5 <1.5 <1.5 <1.5 <1.5 1.5 100
average = -----------
standard deviation = -----------
MW-211R LOD SWSL
PROJECT: GROUNDWATER MONITORING PROGRAM
FACILITY: ACTIVE C&D FACILITY
LOCATION: CHAPEL HILL, NORTH CAROLINA
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
MW-110D MW-204S MW-204D QA/QCMW-110SConstituentSample
Date MW-4 MW-5 MW-210
HISTORY OF CHEMICAL ANALYSIS
ORGANIC CONSTITUENTS
MW-209 MW-210DMW-201R
1,4-dichlorobenzene 04/17/90
MCL = 75 07/11/91
FBAC = 1 (SWSL)05/28/92
NCGQS = 6 (2L Std)06/30/93
2L Std = 1.4 (pre- Jan. 2010)11/04/94
2L Std = 6 (Jan. 2010)12/20/94
02/02/95
03/13/95
11/15/95
07/25/96
02/25/97
09/03/97
05/04/98
11/02/98
04/26/99
11/22/99
05/23/00
11/29/00
06/05/01
11/13/01
06/04/02
03/12/03
06/18/03
12/08/03
06/22/04
11/30/04
06/01/05
11/02/05
11/09/05
05/23/06
11/17/06
06/13/07
12/12/07
06/09/08
06/17/08 0.7 J 0.1 1 ic, cc
11/06/08 <0.1 0.6 J <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 0.1 1
05/20/09 <0.38 0.63 J <0.38 <0.38 <0.38 <0.38 <0.38 <0.38 <0.38 0.38 1
11/19/09 <0.38 <0.38 <0.38 <0.38 <0.38 <0.38 <0.38 <0.38 <0.38 0.38 1
06/23/10 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 0.1 1
11/17/10 <0.38 1 <0.38 <0.38 <0.38 <0.38 <0.38 <0.38 <0.38 0.38 1
05/24/11 <0.79 <0.79 <0.79 <0.79 <0.79 <0.79 <0.79 <0.79 <0.79 0.79 1
11/17/11 <0.79 <0.79 <0.79 <0.79 <0.79 <0.79 <0.79 <0.79 0.79 1
06/05/12 <0.19 <0.19 <0.19 <0.19 <0.19 <0.19 <0.19 <0.19 0.19 1
11/14/12 <0.19 <0.19 <0.19 <0.19 <0.19 <0.19 0.19 1
05/13/13 <0.19 <0.19 <0.19 <0.19 <0.19 <0.19 0.19 1
11/12/13 <0.19 <0.19 <0.19 <0.19 <0.19 <0.19 0.19 1
05/13/14 <0.19 <0.19 <0.19 <0.19 <0.19 <0.19 0.19 1
11/11/14 <0.19 <0.19 <0.19 <0.19 <0.19 <0.19 0.19 1
05/13/15 <0.19 <0.19 <0.19 <0.19 <0.19 <0.19 0.19 1
11/10/15 <0.19 <0.19 <0.19 <0.19 <0.19 <0.19 0.19 1
average = -----------
standard deviation = -----------
MW-211R LOD SWSL
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM
HISTORY OF CHEMICAL ANALYSIS
Constituent Sample
Date MW-4 MW-5
ORGANIC CONSTITUENTS
FACILITY: ACTIVE C&D FACILITY
MW-110S QA/QCMW-110D MW-204S MW-204D MW-209 MW-210DMW-201R MW-210
cis-1,2-dichloroethene 04/17/90
MCL = 70 07/11/91
FBAC = 5 (SWSL)05/28/92
NCGQS = 70 (2L Std)06/30/93
11/04/94
12/20/94
02/02/95
03/13/95
11/15/95
07/25/96
02/25/97
09/03/97
05/04/98
11/02/98
04/26/99
11/22/99
05/23/00
11/29/00
06/05/01
11/13/01
06/04/02
03/12/03
06/18/03
12/08/03
06/22/04
11/30/04
06/01/05
11/02/05
11/09/05
05/23/06
11/17/06
06/13/07
12/12/07
06/09/08
06/17/08 1 J 0.1 5 ic, cc
11/06/08 <0.1 0.9 J <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 0.1 5
05/20/09 <0.36 0.67 J <0.36 <0.36 <0.36 <0.36 <0.36 <0.36 <0.36 0.36 5
11/19/09 <0.4 1 J <0.4 <0.4 <0.4 <0.4 <0.4 <0.4 <0.4 0.4 5
06/23/10 <0.075 <0.075 <0.075 <0.075 <0.075 <0.075 <0.075 <0.075 <0.075 0.075 5
11/17/10 <0.36 1.6 J <0.36 <0.36 <0.36 <0.36 <0.36 <0.36 <0.36 0.36 5
05/24/11 <0.72 <0.72 <0.72 <0.72 <0.72 <0.72 <0.72 <0.72 <0.72 0.72 5
11/17/11 <0.72 <0.72 <0.72 <0.72 <0.72 <0.72 <0.72 <0.72 0.72 5
06/05/12 <0.15 <0.15 <0.15 <0.15 <0.15 <0.15 <0.15 <0.15 0.15 5
11/14/12 <0.15 <0.15 <0.15 <0.15 <0.15 <0.15 0.15 5
05/13/13 <0.15 <0.15 <0.15 <0.15 <0.15 <0.15 0.15 5
11/12/13 <0.15 <0.15 <0.15 <0.15 <0.15 <0.15 0.15 5
05/13/14 <0.15 <0.15 <0.15 <0.15 <0.15 <0.15 0.15 5
11/11/14 <0.15 <0.15 <0.15 <0.15 <0.15 <0.15 0.15 5
05/13/15 <0.15 <0.15 <0.15 <0.15 <0.15 <0.15 0.15 5
11/10/15 <0.15 <0.15 <0.15 <0.15 <0.15 <0.15 0.15 5
average = -----------
standard deviation = -----------
MW-211RConstituentMW-204D MW-209 MW-210D QA/QCSample
Date MW-4 MW-5 MW-204S
HISTORY OF CHEMICAL ANALYSIS
ORGANIC CONSTITUENTS
FACILITY: ACTIVE C&D FACILITY
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
MW-201R MW-210 LOD SWSLMW-110S MW-110D
toluene 04/17/90
MCL = 1000 07/11/91
FBAC = 1 (SWSL)05/28/92
NCGQS = 600 (2L Std)06/30/93
2L Std = 1000 (pre- Jan. 2010)11/04/94
2L Std = 600 (Jan. 2010)12/20/94
02/02/95
03/13/95
11/15/95
07/25/96
02/25/97
09/03/97
05/04/98
11/02/98
04/26/99
11/22/99
05/23/00
11/29/00
06/05/01
11/13/01
06/04/02
03/12/03
06/18/03
12/08/03
06/22/04
11/30/04
06/01/05
11/02/05
11/09/05
05/23/06
11/17/06
06/13/07
12/12/07
06/09/08
06/17/08 0.4 J 0.3 1 ic, cc
11/06/08 <0.3 0.4 J <0.3 <0.3 <0.3 <0.3 <0.3 <0.3 0.3 1
05/20/09 <0.3 <0.3 <0.3 <0.3 <0.3 <0.3 <0.3 <0.3 <0.3 0.3 1
11/19/09 <0.27 <0.27 <0.27 <0.27 <0.27 <0.27 <0.27 <0.27 <0.27 0.27 1
06/23/10 <0.053 <0.053 <0.053 <0.053 <0.053 <0.053 <0.053 <0.053 <0.053 0.053 1
11/17/10 <0.27 <0.27 <0.27 <0.27 <0.27 <0.27 <0.27 <0.27 <0.27 0.27 1
05/24/11 <0.85 <0.85 <0.85 <0.85 <0.85 <0.85 <0.85 <0.85 <0.85 0.85 1
11/17/11 <0.85 <0.85 <0.85 <0.85 <0.85 <0.85 <0.85 <0.85 0.85 1
06/05/12 <0.14 <0.14 <0.14 <0.14 <0.14 <0.14 <0.14 <0.14 0.14 1
11/14/12 <0.14 <0.14 <0.14 <0.14 <0.14 <0.14 0.14 1
05/13/13 <0.14 <0.14 <0.14 <0.14 <0.14 <0.14 0.14 1
11/12/13 <0.14 <0.14 <0.14 <0.14 <0.14 <0.14 0.14 1
05/13/14 <0.14 <0.14 <0.14 <0.14 <0.14 <0.14 0.14 1
11/11/14 <0.14 <0.14 <0.14 <0.14 <0.14 <0.14 0.14 1
05/13/15 <0.14 <0.14 <0.14 <0.14 <0.14 <0.14 0.14 1
11/10/15 <0.14 <0.14 <0.14 <0.14 <0.14 <0.14 0.14 1
average = -----------
standard deviation = -----------
MW-211R
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
FACILITY: ACTIVE C&D FACILITY
MW-201RConstituentSample
Date MW-4 MW-5 MW-110S MW-110D MW-204S
HISTORY OF CHEMICAL ANALYSIS
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM
LOD SWSL
ORGANIC CONSTITUENTS
MW-204D MW-209 MW-210DMW-210 QA/QC
All results in µg/L.
Shaded cells indicate data not available.
Upgradient well shaded yellow.
Blue bolded values indicate concentrations that exceeded the FBAC.
Red bolded values indicate concentrations that exceeded the NCGQS.
Green bolded cells indicate concentrations that were >LOD but <SWSL,
or >LOD but <Method Reporting Limit, if no SWSL.
B - detect associated with blank contamination J - concentration is estimated
i - found in instrument blank t - found in trip blank
f - found in field blank ic - initial calibration beyond limits
cc - continuing calibration beyond limits d - duplicates beyond limits
ss - surrogate spikes beyond limits is - internal standard beyond limits
sd - serial dilution beyond limits ms - matrix spike beyond limits
ics - interference check sample beyond limits lcs – laboratory control sample beyond limits
q – reporting limit standard beyond limits msd - matrix spike duplicate beyond limits
FBAC – facility background NCGQS - Groundwater Standard, as established by the NCDENR
SWSL - solid waste section limit, as established by NCDENR SPL – statistical prediction limit
GWPS - ground water protection standard
R00592-162
ORGANIC CONSTITUENTS
HISTORY OF CHEMICAL ANALYSIS
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
FACILITY: ACTIVE C&D FACILITY
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM

ATTACHMENT 6

SUMMARY OF INORGANIC CONSTITUENTS

ATTACHMENT 6

INORGANIC CONSTITUENTS

During November 10, November 11, and November 12, 2015 (sampling event 21), Sherrill
Environmental personnel obtained groundwater samples from seven groundwater monitoring wells
at the Orange County Solid Waste Management Active C&D Facility.

Groundwater samples to be analyzed for metals were not filtered in the field, such that all metals
were analyzed as total metals.

 During event 21, the laboratory detected twelve inorganic (metal) constituents, at
concentrations greater than their respective method detection limits (>MDLs): arsenic,
barium, beryllium, cobalt, copper, iron, lead, manganese, mercury, selenium, vanadium,
zinc.

The laboratory reported manganese in an associated instrument blank (>1.10 µg/l but
<10.0 µg/l) for well 6801-MW4. Since the reported concentration of manganese in
well 6801-MW4 (4.52 µg/l) is less than 5x the estimated concentration in the
associated blank (10.0 µg/l x 5 = 50 µg/l), the reported concentration in well 6801-
MW4 may be attributed to cross-contamination (flagged “B”).

Of the twelve inorganic constituents (metals) detected, the reported concentrations of four
inorganic constituents exceeded their respective Solid Waste Section Limits (>SWSLs):
 iron
 manganese
 mercury
 zinc

Of the four inorganic constituents (metals) that exceeded their respective Solid Waste
Section Limits (>SWSLs), the reported concentrations of two inorganic constituents
exceeded their respective Facility Background Concentrations (= SWSLs, except where
calculated), but did not exceed their North Carolina Groundwater Quality Standards:
 mercury (6804-MW209, 6804-MW211R)
 zinc (6804-MW209, 6804-MW211R).

Of the four inorganic constituents (metals) that exceeded their respective Solid Waste
Section Limits (>SWSLs), the reported concentrations of two inorganic constituents
exceeded their respective Facility Background Concentrations (= SWSL, except where
calculated) and North Carolina Groundwater Quality Standards:

Inorganic Constituents
Page 2

 iron (6801-MW-110S, 6804-MW209, 6804-MW211R)
 manganese (6804-MW204S, 6804-MW209, 6804-MW210D, 6804-MW211R)

15A NCAC 13B.0545.(b)(8) states, “The owner or operator may demonstrate that a source
other than a C&DLF caused the contamination. An alternate source demonstration report
must be prepared by a certified Licensed Geologist and submitted for approval by the
Division.”

 Iron. OCSWM submitted an Alternate Source Demonstration (dated July 8, 2011),
showing that total iron observed in groundwater at the site could have been derived
from onsite soils. In a letter from NCDENR to OCSWM (dated August 25, 2011),
NCDENR approved the Alternate Source Demonstration. In accordance with the
approved Alternate Source Demonstration, the reported exceedances of total iron
may be attributed to the naturally occurring presence of iron in onsite soil and rock.

 Manganese. OCSWM submitted an Alternate Source Demonstration (dated July 9,
2011), showing that total manganese observed in groundwater at the site could have
been derived from onsite soils. In a letter from NCDENR to OCSWM (dated August
25, 2011), NCDENR approved the Alternate Source Demonstration. In accordance
with the approved Alternate Source Demonstration, the reported exceedances of total
manganese may be attributed to the naturally occurring presence of manganese in
onsite soil and rock.

 During event 21, the laboratory detected four additional parameters, at concentrations
greater than their respective method detection limits (>MDLs):
 alkalinity (total)
 chloride
 total dissolved solids
 sulfate

Of the four additional parameters detected, three exceeded their respective Solid Waste
Section Limits (>SWSLs):
 alkalinity (no SWSL; exceeds its Method Reporting Level = MRL)
 chloride (no SWSL; exceeds MRL)
 total dissolved solids (no SWSL; exceeds MRL)

Inorganic Constituents
Page 3

Recommended Actions. In accordance with the current Groundwater Monitoring Plan (approved
May 23, 2012) for the active C&D landfill, the facility should:
 continue semi-annual and annual sampling of all permitted wells associated solely with the
active C&D landfill (6804-MW204S, 6804-MW209, 6804-MW210, 6804-MW211R) for all
constituents listed in Appendix I (40 CFR Part 258), mercury, chloride, manganese, sulfate,
iron, specific conductance, pH, temperature, alkalinity, and total dissolved solids (TDS)
 continue semi-annual and annual sampling of permitted well 6801-MW4, shared between
the active C&D landfill and the existing North sanitary landfill area, for all constituents
listed in Appendix I, mercury, chloride, manganese, sulfate, iron, specific conductance,
pH, temperature, alkalinity, and total dissolved solids (TDS)
 continue semi-annual and annual sampling of permitted well 6801-MW110S, shared
between the active C&D landfill and the existing South sanitary landfill areas, for all
constituents listed in Appendix I, mercury, chloride, manganese, sulfate, iron, specific
conductance, pH, temperature, alkalinity, and total dissolved solids (TDS)

Well 6801-MW4 is associated with both the C&D landfill and the North sanitary landfill. In
accordance with the approved Groundwater Monitoring Plan pertaining to the North sanitary
landfill, the facility shall:
 continue semi-annual and annual sampling of permitted well 6801-MW4 for any
constituents listed in Appendix II that have previously been detected in groundwater at the
North sanitary landfill (mercury, naphthalene, sulfide)

Well 6801-MW110D serves as a background well for the South landfill, but appears to be
hydrogeologically downgradient of the C&D landfill. Accordingly, the facility shall:
 continue semi-annual and annual sampling of well 6801-MW110D and analyze it for total
arsenic

METALS

antimony 04/17/90
MCL = 6 07/11/91
FBAC = 6 (SWSL)05/28/92
NCGQS = 1 (GWPS)06/30/93
GWPS = 1.4 (pre-Oct. 2010)11/04/94
GWPS = 1 (Oct. 2010)12/20/94
02/02/95
03/13/95
05/18/95
07/20/95
11/15/95
11/28/95
02/28/96
07/25/96
08/27/96
02/25/97
09/03/97
03/25/98
05/04/98
11/02/98
04/26/99
11/22/99
05/23/00
11/29/00
05/30/01
06/05/01
11/13/01
06/04/02
03/12/03
06/18/03
12/08/03
06/22/04
11/30/04
06/01/05
06/06/05
11/02/05
11/09/05
05/23/06
11/17/06
06/13/07
12/12/07 <1.2 <1.2 1.8 JB <1.2 <1.2 <1.2 1.4 JB 1.2 6 f,i
06/09/08 <1.2 <1.2 1.6 JB 2.2 JB <1.2 <1.2 <1.2 <1.2 1.2 6 i
11/06/08 <1.2 <1.2 <1.2 <1.2 <1.2 <1.2 <1.2 <1.2 1.2 6
05/20/09 <0.68 <0.68 <0.68 <0.68 1.59 JB <0.68 0.77 JB <0.68 <0.68 0.68 6 i
11/19/09 <0.073 <0.073 <0.073 0.106 J 0.319 J <0.073 <0.073 <0.073 <0.073 0.073 6
06/23/10 <0.22 0.352 J <0.22 <0.22 <0.22 <0.22 <0.22 <0.22 <0.22 0.22 6
11/17/10 <0.22 <0.22 <0.22 <0.22 <0.22 <0.22 <0.22 <0.22 <0.22 0.22 6
05/24/11 <0.22 0.37 J <0.22 <0.22 <0.22 <0.22 <0.22 <0.22 <0.22 0.22 6
11/17/11 <0.22 <0.22 <0.22 <0.22 <0.22 0.554 J <0.22 0.22 6
06/05/12 1 JB 1.18 JB 0.797 JB 0.561 JB 0.963 JB 0.262 JB <0.22 0.432 JB 0.22 6 i
11/14/12 <0.22 0.34 J 0.373 J <0.22 <0.22 <0.22 0.22 6 i
05/13/13 0.320 J 0.277 J 0.492 JB <0.22 <0.22 <0.22 0.22 6 i
11/12/13 <0.220 <0.220 0.890 J <0.220 <0.220 <0.220 0.220 6
05/13/14 <0.220 <0.220 <0.220 <0.220 <0.220 <0.220 0.220 6
11/11/14 0.603 J 0.609 J 0.660 J <0.220 <0.220 <0.220 0.220 6
05/13/15 0.780 J 0.765 J 0.775 J <0.220 0.251 J <0.220 0.220 6
11/10/15 0.237 J <0.220 <0.220 <0.220 <0.220 <0.220 0.220 6
average = -----------
standard deviation = -----------
LOD SWSLMW-209 MW-210D QA/QCMW-211RMW-210ConstituentSample Date MW-4 MW-204DMW-5 MW-110S MW-110D MW-204SMW-201R
INORGANIC CONSTITUENTS: TOTAL METALS
HISTORY OF CHEMICAL ANALYSIS
FACILITY: ACTIVE C&D FACILITY
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM
LOD SWSLMW-209 MW-210D QA/QCMW-211RMW-210ConstituentSample Date MW-4 MW-204DMW-5 MW-110S MW-110D MW-204SMW-201R
INORGANIC CONSTITUENTS: TOTAL METALS
HISTORY OF CHEMICAL ANALYSIS
FACILITY: ACTIVE C&D FACILITY
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM
arsenic 04/17/90 <10 <10
MCL = 10 07/11/91 <10 <10
FBAC = 10 (SWSL)05/28/92 <10 <10
NCGQS = 10 (2L Std)06/30/93 <10
2L Std = 50 (pre-Jan. 2010)11/04/94 <10
2L Std = 10 (Jan. 2010)12/20/94 <10
02/02/95 <10
(Concentrations in 03/13/95 <10 <10
MW-110D represent 05/18/95 <10 25 J
background conditions 07/20/95 <10 27 J
for South sanitary 11/15/95 <10 <10
landfill; FBAC for this 11/28/95 <10 176
well has been 02/28/96 <10 14
previously established 07/25/96 <10
as 447 ppb; see report 08/27/96 <10 20
for further discussion)02/25/97 <10 <10 <10 <10
09/03/97 <10 <10 12 B
03/25/98 <10 11
05/04/98 <10 <10
11/02/98 <10 <10 <10
04/26/99 <10 <10 <10
11/22/99 <10 <10 <10
05/23/00 <10 20 J <10 10 J
11/29/00 <10 <10 <10
05/30/01 <10 324
06/05/01 <10 20
11/13/01 <10 <10 447 J
06/04/02 <10 <10 342 J
03/12/03 <10
06/18/03 <10 <10 312
12/08/03 <10 <10 149 J
06/22/04 <10 <10 <10
11/30/04 <10 <10 <10
06/01/05 <10
06/06/05 <10 157
11/02/05 <10 <10 <10
11/09/05 <10 <10 <10 <10
05/23/06 <10 <10 132 <10 <10 <10 <10
11/17/06 <10 <10 152 <10 <10 <10 <10
06/13/07 <5.5 <5.5 260 <5.5 <5.5 <5.5 <5.5 5.5 10
12/12/07 <5.5 <5.5 48.7 <5.5 <5.5 <5.5 <5.5 5.5 10
06/09/08 <5.5 <5.5 <5.5 42 B <5.5 <5.5 <5.5 <5.5 5.5 10 t, i
11/06/08 <5.5 <5.5 <5.5 87.9 B <5.5 <5.5 <5.5 <5.5 5.5 10 f
05/20/09 <2.8 20.1 <2.8 11.9 <2.8 4.1 J <2.8 <2.8 <2.8 2.8 10
11/19/09 5.74 JB 33.3 <2.8 8.78 J <2.8 <2.8 <2.8 <2.8 <2.8 2.8 10 f
06/23/10 3.14 JB 26 <2.8 13.1 4.66 J <2.8 <2.8 <2.8 2.96 JB 2.8 10 i
11/17/10 <2.8 36.9 <2.8 15.9 3.55 JB <2.8 <2.8 <2.8 9.13 JB 2.8 10 i
05/24/11 <2.8 21.8 <2.8 31.6 <2.8 <2.8 <2.8 <2.8 <2.8 2.8 10
11/17/11 <2.8 13.4 B <2.8 <2.8 <2.8 4.64 JB 3.26 JB 2.8 10 i
06/05/12 <2.8 <2.8 15.2 <2.8 <2.8 <2.8 <2.8 <2.8 2.8 10
11/14/12 <2.8 3.42 JB 16 B <2.8 <2.8 <2.8 4.66 JB 2.8 10 i
05/13/13 <5.4 <5.4 8.92 J <5.4 <5.4 <5.4 <5.4 5.4 10
11/12/13 <5.40 <5.40 13.6 <5.40 <5.40 <5.40 <5.40 5.40 10
05/13/14 <5.40 <5.40 12.6 <5.40 <5.40 <5.40 <5.40 5.40 10
11/11/14 <5.40 <5.40 <5.40 <5.40 <5.40 <5.40 <5.40 5.40 10
05/13/15 <6.80 <6.80 11.5 <6.80 <6.80 <6.80 <6.80 6.80 10
11/10/15 <6.80 <6.80 7.92 J <6.80 <6.80 <6.80 <6.80 6.80 10
average = -27.62 -91.16 -------
standard deviation = -7.27 -108.92 -------
LOD SWSLMW-209 MW-210D QA/QCMW-211RMW-210ConstituentSample Date MW-4 MW-204DMW-5 MW-110S MW-110D MW-204SMW-201R
INORGANIC CONSTITUENTS: TOTAL METALS
HISTORY OF CHEMICAL ANALYSIS
FACILITY: ACTIVE C&D FACILITY
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM
barium 04/17/90 71 <50
MCL = 2000 07/11/91 <100 482
FBAC = 500 (SPL)05/28/92 <100 <100
NCGQS = 700 (2L Std)06/30/93 <500
2L Std = 2000 (pre-Jan. 2010)11/04/94 <500
2L Std = 700 (Jan. 2010)12/20/94 <500
02/02/95 <500
03/13/95 <500 <500
05/18/95 <500 <500
07/20/95 <500 <500
11/15/95 <500 <500
11/28/95 <500 512
02/28/96 <500 <500
07/25/96 <500
08/27/96 <500 <500
02/25/97 <500 <500 <500 <500
09/03/97 <500 <500 <500
03/25/98 <500 <500
05/04/98 <500 <500
11/02/98 <500 <500 <500
04/26/99 <500 <500 <500
11/22/99 <500 <500 <500
05/23/00 <500 <500 <500 <500
11/29/00 <500 <500 <500
05/30/01 <500 <500
06/05/01 <500 <500 <500
11/13/01 <500 <500 <500
06/04/02 <500 <500 <500
03/12/03 <500 <500
06/18/03 <500 <500
12/08/03 <500 <500
06/22/04 <500 <500
11/30/04 <500 <500
06/01/05 <500
06/06/05 <500 <500
11/02/05 <500 <500 <500
11/09/05 <500 <500 <500 <500
05/23/06 <500 <500 <500 <500 <500 <500 <500
11/17/06 <500 <500 <500 <500 <500 <500 <500
06/13/07 64.9 J 6.1 JB 53.8 J 22.9 JB 85.1 J 34.1 JB 60.2 J 1.1 100 t, f
12/12/07 53.1 J 25.1 J 14.5 J 50.9 J 54.2 J 33.4 J 88 J 1.1 100 i
06/11/08 53.2 J 91.4 J 4.8 JB 11.4 JB 57.5 J 77.0 J 30.2 J 63.4 J 1.1 100 t, f, i
11/06/08 53.7 JB 163 5.5 JB 22.3 JB 40.2 JB 66.4 J 29.5 JB 6.35 JB 1.1 100 t, f, i
05/20/09 68.8 J 77.9 J <4.2 5.19 J 131 69.6 J 61 J 45.5 J 75.4 J 4.2 100
11/19/09 57.6 J 71.5 J 3.2 J 3.96 J 65.6 J 65.9 J 51.3 J 44.9 J 46.4 J 1 100
06/23/10 107 49.5 J 5.93 J 4.01 J 50.2 J 44 J 55.9 J 55.2 J 77.8 J 1 100
11/17/10 63.3 J 91.3 J 3.99 J 4.79 J 41.7 J 44 J 49.8 J 50.2 J 103 1 100
05/24/11 77.5 J 67.3 J 3.88 J 9.97 J 50.2 J 44.8 J 60.5 J 52.5 J 45.8 J 1 100
11/17/11 66.3 J 4.59 J 3.91 J 76.7 J 54.9 J 45.6 J 50.3 J 1 100
06/05/12 88.1 J 3.29 J 4.51 J 73.8 J 62.6 J 50.6 J 48.3 J 43.3 J 1 100
11/14/12 67.1 J 3.96 J 55.1 J 43.4 J 95.5 J 60.6 J 1 100
05/13/13 64.1 J 4.16 J 36 J 45.2 J 139 42.9 J 1 100
11/12/13 64.2 J 4.45 J 44.3 J 48.9 J 19.8 J 47.5 J 1.00 100
05/13/14 66.8 J 4.30 J 52.7 J 39.6 J 18.7 J 51.3 J 1.00 100
11/11/14 67.9 J 4.58 J 48.1 J 42.4 J 18.3 J 61.4 J 1.00 100
05/13/15 79.3 J 4.95 J 35.0 J 42.6 J 17.3 J 62.1 J 1.00 100
11/10/15 65.5 J 3.55 J 32.5 J 38.5 J 17.3 J 83.1 J 1.00 100
average = 89.00 322.50 -512.00 131.00 ---121.00 --
standard deviation = -225.57 ------25.46 --
LOD SWSLMW-209 MW-210D QA/QCMW-211RMW-210ConstituentSample Date MW-4 MW-204DMW-5 MW-110S MW-110D MW-204SMW-201R
INORGANIC CONSTITUENTS: TOTAL METALS
HISTORY OF CHEMICAL ANALYSIS
FACILITY: ACTIVE C&D FACILITY
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM
beryllium 04/17/90
MCL = 4 07/11/91
FBAC = 1 (SWSL)05/28/92
NCGQS = 4 (GWPS)06/30/93
11/04/94 <2
12/20/94 <2
02/02/95 <2
03/13/95 <2 2.8
05/18/95 2 <2
07/20/95 <2 3
11/15/95 <2 2.6
11/28/95 <2 37
02/28/96 <2 2.6
07/25/96 <2
08/27/96 <2 <2
02/25/97 <2 <2 <2 <2
09/03/97 <2 <2 <2
03/25/98 <2 <2
05/04/98 <2 <2
11/02/98 <2 <2 <2
04/26/99 <2 <2 <2
11/22/99 <2 <2 <2
05/23/00 <2 <2 <2 <2
11/29/00 <2 <2 <2
05/30/01 <2 <2
06/05/01 <2 <2 <2
11/13/01 <2 <2 <2
06/04/02 <2 <2 <2
03/12/03 <2 <2
06/18/03 <2 <2
12/08/03 <2 <2
06/22/04 <2 <2
11/30/04 <2 <2
06/01/05 <2
06/06/05 <2 <2
11/02/05 <2 <2 <2
11/09/05
05/23/06 <2 <2 <2
11/17/06
06/13/07 0.6 J <0.2 0.4 J <0.2 <0.2 <0.2 <0.2 0.2 1
12/12/07 <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 0.4 JB 0.2 1 i
06/11/08 <0.2 <0.2 <0.2 0.6 J 0.3 J 0.3 J <0.2 <0.2 0.2 1
11/06/08 <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 0.2 1
05/20/09 0.08 J <0.08 <0.08 0.12 J 0.35 J 0.24 J <0.08 <0.08 <0.08 0.08 1
11/19/09 <0.1 <0.1 <0.1 <0.1 0.14 J 0.189 J <0.1 <0.1 <0.1 0.1 1
06/23/10 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 0.249 J 0.1 1
11/17/10 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 0.7 J 0.1 1
05/24/11 0.125 J 0.111 J <0.1 0.106 J <0.1 <0.1 <0.1 <0.1 <0.1 0.1 1
11/17/11 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 0.248 J 0.1 1
06/05/12 0.133 J <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 0.1 1
11/14/12 <0.1 <0.1 <0.1 <0.1 0.138 J <0.1 0.1 1
05/13/13 <0.1 <0.1 <0.1 <0.1 0.462 J 0.137 J 0.1 1
11/12/13 <0.100 <0.100 <0.100 <0.100 <0.100 <0.100 0.100 1
05/13/14 <0.100 <0.100 <0.100 <0.100 <0.100 <0.100 0.100 1
11/11/14 <0.100 <0.100 <0.100 <0.100 <0.100 0.119 J 0.100 1
05/13/15 <0.100 <0.100 <0.100 <0.100 <0.100 <0.100 0.100 1
11/10/15 <0.100 <0.100 <0.100 <0.100 <0.100 0.153 J 0.100 1
average = -2.70 2.00 14.20 -------
standard deviation = -0.14 -19.75 -------
LOD SWSLMW-209 MW-210D QA/QCMW-211RMW-210ConstituentSample Date MW-4 MW-204DMW-5 MW-110S MW-110D MW-204SMW-201R
INORGANIC CONSTITUENTS: TOTAL METALS
HISTORY OF CHEMICAL ANALYSIS
FACILITY: ACTIVE C&D FACILITY
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM
cadmium 04/17/90 <2 <2
MCL = 5 07/11/91 <2 <2
FBAC = 1 (SWSL)05/28/92 <2 <2
NCGQS = 2 (2L Std)06/30/93 2.7
2L Std = 1.75 (pre-Jan. 2010)11/04/94 <1
2L Std = 2 (Jan. 2010)12/20/94 <1
02/02/95 <1
03/13/95 <1 1.1 B
05/18/95 <1 1.7 B
07/20/95 <1 6.1 J
11/15/95 1.2 B 1.7 B
11/28/95 4 J <1
02/28/96 <1 1.2 B
07/25/96 <1
08/27/96 <1 <1
02/25/97 <1 <1 <1 <1
09/03/97 <1 <1 <1
03/25/98 <1 <1
05/04/98 <1 <1
11/02/98 <1 <1 <1
04/26/99 <1 <1 <1
11/22/99 <1 <1 <1
05/23/00 <1 <1 4J <1
11/29/00 <1 <1 1.2 B
05/30/01 <1 2
06/05/01 <1 <1 <1
11/13/01 <1 <1 <1 <1
06/04/02 <1 <1 <1
03/12/03 <1 <1
06/18/03 1 B <1
12/08/03 <1 <1
06/22/04 <1 <1
11/30/04 <1 <1
06/01/05 <1
06/06/05 <1 <1
11/02/05 <1 <1 <1
11/09/05 <1 <1 <1 <1
05/23/06 <1 <1 <1 <1 <1 <1 <1
11/17/06 <1 <1 <1 <1 <1 <1 <1
06/13/07 0.6 JB <0.2 3.1 <0.2 <0.2 0.7 JB 0.6 JB 0.2 1 t, f
12/12/07 <0.2 <0.2 <0.2 <0.2 <0.2 0.3 JB 0.5 JB 0.2 1 i
06/11/08 <0.2 <0.2 0.4 JB 0.4 JB 0.6 J 0.3 J 0.4 J <0.2 0.2 1 i
11/06/08 <0.2 <0.2 0.2 JB <0.2 <0.2 <0.2 0.6 JB 0.6 JB 0.2 1 t, f, i
05/20/09 0.29 J 0.25 JB 0.23 J 0.15 J 0.43 JB 0.19 JB 0.11 JB 0.42 JB 0.27 JB 0.09 1
11/19/09 <0.36 <0.36 <0.36 <0.36 <0.36 <0.36 <0.36 <0.36 <0.36 0.36 1
06/23/10 <0.36 <0.36 <0.36 <0.36 <0.36 <0.36 <0.36 <0.36 1.33 0.36 1
11/17/10 <0.36 <0.36 <0.36 <0.36 <0.36 <0.36 <0.36 <0.36 0.984 J 0.36 1
05/24/11 <0.36 <0.36 <0.36 <0.36 <0.36 <0.36 <0.36 <0.36 0.625 J 0.36 1
11/17/11 <0.36 <0.36 <0.36 <0.36 <0.36 <0.36 0.465 J 0.36 1
06/05/12 <0.36 <0.36 <0.36 <0.36 <0.36 <0.36 0.563 J <0.36 0.36 1
11/14/12 <0.36 0.43 J <0.36 <0.36 <0.36 <0.36 0.36 1
05/13/13 <0.36 <0.36 <0.36 <0.36 <0.36 <0.36 0.36 1
11/12/13 <0.360 <0.360 <0.360 <0.360 <0.360 <0.360 0.360 1
05/13/14 <0.360 <0.360 <0.360 <0.360 <0.360 <0.360 0.360 1
11/11/14 <0.360 <0.360 <0.360 <0.360 <0.360 <0.360 0.360 1
05/13/15 <0.360 <0.360 <0.360 <0.360 <0.360 <0.360 0.360 1
11/10/15 0.433 J <0.360 <0.360 <0.360 <0.360 <0.360 0.360 1
average = 2.70 --3.10 ----1.33 --
standard deviation = -----------
LOD SWSLMW-209 MW-210D QA/QCMW-211RMW-210ConstituentSample Date MW-4 MW-204DMW-5 MW-110S MW-110D MW-204SMW-201R
INORGANIC CONSTITUENTS: TOTAL METALS
HISTORY OF CHEMICAL ANALYSIS
FACILITY: ACTIVE C&D FACILITY
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM
chromium 04/17/90 <20 <20
MCL = 100 07/11/91 <20 <20
FBAC = 10 (SWSL)05/28/92 <20 <20
NCGQS = 10 (2L Std)06/30/93 <20
2L Std = 50 (pre-Jan. 2010)11/04/94 <10
2L Std = 10 (Jan. 2010)12/20/94 <10
02/02/95 <10
03/13/95 <10 <10
05/18/95 16.5 B 10 B
07/20/95 12 B 22 J
11/15/95 <10 12
11/28/95 <10 69
02/28/96 <10 <10
07/25/96 <10
08/27/96 <10 11 B
02/25/97 <10 <10 <10 <10
09/03/97 <10 <10 <10
03/25/98 <10 <10
05/04/98 <10 <10
11/02/98 <10 <10 <10
04/26/99 <10 <10 <10
11/22/99 <10 <10 <10
05/23/00 <10 <10 <10 <10
11/29/00 <10 <10 <10
05/30/01 <10 <10
06/05/01 <10 <10 <10
11/13/01 <10 <10 <10
06/04/02 <10 <10 <10
03/12/03 <10 <10
06/18/03 <10 <10
12/08/03 <10 <10
06/22/04 <10 <10
11/30/04 <10 <10
06/01/05 <10
06/06/05 <10 <10
11/02/05 <10 <10 <10
11/09/05 <10 <10 <10 <10
05/23/06 <10 <10 <10 <10 <10 <10 <10
11/17/06 <10 <10 <10 <10 <10 <10 <10 i
06/13/07 5.9 JB 1.3 JB <0.7 1.8 JB 1.6 JB 2.2 JB 2.2 JB 0.7 10 f
12/12/07 <0.7 <0.7 <0.7 1 JB <0.7 <0.7 1.9 JB 0.7 10 i
06/11/08 0.8 JB 0.7 JB 0.9 JB 2.1 JB 3.6 J 1.5 J 0.8 J 2.3 J 0.7 10 t, f
11/06/08 <0.7 28.6 1.9 JB <0.7 2.8 J <0.7 6.7 J 16.8 0.7 10 t, f, i
05/20/09 0.9 J 3.7 J <0.7 <0.7 <0.7 1.9 J <0.7 <0.7 3 J 0.7 10
11/19/09 <1 <1 <1 <1 <1 1.36 J <1 <1 <1 1 10
06/23/10 4.74 J <1 <1 <1 <1 <1 <1 <1 1.04 J 1 10
11/17/10 2.9 J <1 <1 <1 <1 <1 <1 <1 9.87 J 1 10
05/24/11 1.99 J 6.1 J <1 1.14 J <1 <1 <1 1.21 J 1.8 J 1 10
11/17/11 <1 <1 <1 2.18 J <1 1.19 J 4.45 J 1 10
06/05/12 2.81 J <1 <1 1.6 J <1 <1 2.99 J <1 1 10
11/14/12 <1 <1 <1 <1 1.84 J <1 1 10
05/13/13 <1.4 <1.4 <1.4 <1.4 <1.4 <1.4 1.4 10
11/12/13 <1.40 <1.40 <1.40 <1.40 <1.40 3.17 J 1.40 10
05/14/14 <1.40 <1.40 <1.40 <1.40 <1.40 <1.40 1.40 10
11/11/14 <1.40 <1.40 <1.40 <1.40 <1.40 <1.40 1.40 10
05/13/15 <1.40 4.21 J 4.84 JB 8.23 JB 4.40 JB 5.52 JB 1.40 10
11/10/15 <1.40 <1.40 <1.40 <1.40 <1.40 <1.40 1.40 10
average = -28.60 -69.00 ----16.80 --
standard deviation = -----------
LOD SWSLMW-209 MW-210D QA/QCMW-211RMW-210ConstituentSample Date MW-4 MW-204DMW-5 MW-110S MW-110D MW-204SMW-201R
INORGANIC CONSTITUENTS: TOTAL METALS
HISTORY OF CHEMICAL ANALYSIS
FACILITY: ACTIVE C&D FACILITY
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM
cobalt 04/17/90
MCL =07/11/91
FBAC = 10 (SWSL)05/28/92
NCGQS = 1 (GWPS)06/30/93
GWPS = 70 (pre-Oct. 2010)11/04/94 <4
GWPS = 1 (Oct. 2010)12/20/94 <10
02/02/95 <10
03/13/95 <10 100
05/18/95 43 J 16 J
07/20/95 23 14
11/15/95 <10 91 J
11/28/95 15 810
02/28/96 17 14
07/25/96 <10
08/27/96 10 29
02/25/97 <10 140 <10 <10
09/03/97 <10 <10 <10
03/25/98 <10 <10
05/04/98 <10 132
11/02/98 <10 <10 <10
04/26/99 <10 <10 <10
11/22/99 <10 <10 <10
05/23/00 <10 212 <10 <10
11/29/00 <10 <10 <10
05/30/01 <10 <10
06/05/01 <10 278 <10
11/13/01 <10 <10 <10
06/04/02 <10 <10 <10
03/12/03 <10 <10
06/18/03 <10 <10
12/08/03 <10 <10
06/22/04 <10 <10
11/30/04 <10 <10
06/01/05 <10
06/06/05 <10 <10
11/02/05 <10 <10 <10
11/09/05
05/23/06 <10 <10 <10
11/17/06
06/13/07 0.9 J <0.7 1.7 J 1.9 J <0.7 1.5 J 4.1 J 0.7 10
12/12/07 <0.7 0.7 J <0.7 11.5 <0.7 2.3 J 2.8 J 0.7 10
06/11/08 <0.7 241 <0.7 1.7 J 9 J 0.8 J 2.1 J 11.2 0.7 10
11/06/08 <0.7 237 2.3 J 1.6 J 4.6 J <0.7 2.3 J 7.2 J 0.7 10
05/20/09 <0.6 173 <0.6 1.1 J 11.2 8.9 J <0.6 3.7 J 12.6 0.6 10
11/19/09 <1.1 186 <1.1 <1.1 4.72 J 11.2 <1.1 4.77 J 4.6 J 1.1 10
06/23/10 3.37 J 134 <1.1 <1.1 <1.1 5.42 J <1.1 35 10.6 1.1 10
11/17/10 <1.1 177 <1.1 <1.1 1.58 J 4.48 J <1.1 19 11.2 1.1 10
05/24/11 <1.1 204 <1.1 <1.1 <1.1 2.86 J <1.1 13.8 4.22 J 1.1 10
11/17/11 <1.1 <1.1 1.15 J 7.98 J <1.1 9.35 J 5.5 J 1.1 10
06/05/12 1.61 J <1.1 <1.1 6.21 J <1.1 11 2.02 J 7.05 J 1.1 10
11/14/12 <1.1 <1.1 6.18 J 11 2.61 J 9.72 J 1.1 10
05/13/13 <1.1 <1.1 3.04 J 10.4 3.2 J 6.81 J 1.1 10
11/12/13 <1.10 1.48 J 3.98 J 14.0 <1.10 7.09 J 1.10 10
05/14/14 <1.10 1.25 J 10.9 8.89 J <1.10 6.74 J 1.10 10
11/11/14 <1.10 1.38 J 7.14 J 10.1 <1.10 8.92 J 1.10 10
05/13/15 <1.10 2.15 J 5.77 J 8.10 J <1.10 7.31 J 1.10 10
11/10/15 <1.10 <1.10 2.47 J 7.09 J <1.10 9.51 J 1.10 10
average = -193.14 16.25 216.75 11.20 11.20 -15.54 11.40 --
standard deviation = -37.74 5.38 395.56 -0.30 -8.39 0.85 --
LOD SWSLMW-209 MW-210D QA/QCMW-211RMW-210ConstituentSample Date MW-4 MW-204DMW-5 MW-110S MW-110D MW-204SMW-201R
INORGANIC CONSTITUENTS: TOTAL METALS
HISTORY OF CHEMICAL ANALYSIS
FACILITY: ACTIVE C&D FACILITY
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM
copper 04/17/90 <20 <20
MCL = 1300 07/11/91 <20 <20
FBAC = 10 (SWSL)05/28/92 <20 35
NCGQS = 1000 (2L Std)06/30/93 <20
11/04/94 <200
12/20/94 <200
02/02/95 <200
03/13/95 <200 <200
05/18/95 <200 <200
07/20/95 <200 <200
11/15/95 <200 211
11/28/95 <200 483
02/28/96 <200 <200
07/25/96 <200
08/27/96 <200 <200
02/25/97 <200 <200 <200 <200
09/03/97 <200 <200 <200
03/25/98 <200 <200
05/04/98 <200 <200
11/02/98 <200 <200 <200
04/26/99 <200 <200 <200
11/22/99 <200 <200 <200
05/23/00 <200 <200 <200 <200
11/29/00 <200 <200 <200
05/30/01 <200 <200
06/05/01 <200 <200 <200
11/13/01 <200 <200 <200
06/04/02 <200 <200 <200
03/12/03 <200 <200
06/18/03 <200 <200
12/08/03 <200 <200
06/22/04 <200 <200
11/30/04 <200 <200
06/01/05 <200
06/06/05 <200 <200
11/02/05 <200 <200 <200
11/09/05
05/23/06 <200 <200 <200
11/17/06
06/13/07 <2 <2 2.2 JB 4.4 JB 3.1 JB 4.4 JB 4.3 JB 2 10 t
12/12/07 2.6 J 2.7 J <2 8.3 J <2 2.2 J 6.8 J 2 10
06/11/08 <2 14.8 B 2.2 JB <2 13.1 5.3 JB 7.4 JB <2 2 10 t, i
11/06/08 <2 2.2 JB <2 <2 <2 <2 3.6 JB <2 2 10 t, i
05/20/09 2.76 J 7.39 J <0.81 1.01 J 3.38 J 4.14 J <0.81 0.89 J <0.81 0.81 10
11/19/09 2.03 J 13.6 <1.6 <1.6 4.93 J 4.54 J <1.6 3.51 J <1.6 1.6 10
06/23/10 26.5 3.8 J <1.6 <1.6 <1.6 2.04 J <1.6 3.4 J 3.5 J 1.6 10
11/17/10 7.7 J 3.6 J <1.6 3.01 J <1.6 1.93 J <1.6 4.14 J 17.3 1.6 10
05/24/11 8.77 J 4.72 J 3.17 J 3.17 J <1.6 <1.6 <1.6 10.4 <1.6 1.6 10
11/17/11 2.92 J <1.6 <1.6 5.6 J <1.6 2.62 J 4.57 J 1.6 10
06/05/12 10.6 J 1.78 J 1.65 J 5.43 J <1.6 10.6 <1.6 2.48 J 1.6 10 ms/msd
11/14/12 <1.6 <1.6 <1.6 5.53 J <1.6 <1.6 1.6 10
05/13/13 <1.6 <1.6 <1.6 2.16 J <1.6 <1.6 1.6 10
11/12/13 <1.60 <1.60 <1.60 2.95 J <1.60 <1.60 1.60 10
05/14/14 <1.60 <1.60 1.63 J 12.3 <1.60 3.52 J 1.60 10
11/11/14 <1.60 4.98 J <1.60 13.3 <1.60 <1.60 1.60 10
05/13/15 <1.60 <1.60 <1.60 10.5 <1.60 2.50 J 1.60 10
11/10/15 <1.60 <1.60 <1.60 7.35 J <1.60 <1.60 1.60 10
average = -13.60 ---13.10 -11.42 ---
standard deviation = -------1.31 ---
LOD SWSLMW-209 MW-210D QA/QCMW-211RMW-210ConstituentSample Date MW-4 MW-204DMW-5 MW-110S MW-110D MW-204SMW-201R
INORGANIC CONSTITUENTS: TOTAL METALS
HISTORY OF CHEMICAL ANALYSIS
FACILITY: ACTIVE C&D FACILITY
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM
iron 04/17/90
MCL =07/11/91
FBAC = 300 (SWSL)05/28/92
NCGQS = 300 (2L Std)06/30/93
11/04/94
12/20/94
02/02/95
03/13/95
05/18/95
07/20/95
11/15/95
11/28/95
02/28/96
07/25/96
08/27/96
02/25/97
09/03/97
03/25/98
05/04/98
11/02/98
04/26/99
11/22/99
05/23/00
11/29/00
05/30/01
06/05/01
11/13/01
06/04/02
03/12/03
06/18/03
12/08/03
06/22/04
11/30/04
06/01/05
06/06/05
11/02/05
11/09/05
05/23/06
11/17/06
06/13/07 156000 95.7 JB 59 JB 357 913 1290 3100 21.5 300 t, f
12/12/07 284 J 74 JB 12500 2180 857 139 B 3240 21.5 300 t
06/11/08 428 24900 <21.5 9510 2040 5650 398 7010 21.5 300
11/06/08 196 JB 3800 115 JB 2440 859 2700 287 JB 4050 21.5 300 f
05/20/09 1150 3640 216 J 2180 59 J 3160 391 223 J 3820 31 300
11/19/09 664 12500 218 J 2440 285 J 3530 320 336 2010 22 300
06/23/10 10900 8500 550 1780 879 988 293 J 603 8430 22 300
11/17/10 3380 50500 256 J 3330 4750 1250 380 727 24600 22 300
05/24/11 3040 23900 171 J 8710 2490 585 457 1580 1980 22 300
11/17/11 1110 2110 369 3600 408 695 7730 22 300
06/05/12 5080 103 J 2610 3990 480 1270 914 979 22 300
11/14/12 464 163 J 803 555 3410 462 22 300
05/13/13 383 152 J 182 J 400 4800 459 22 300
11/12/13 <22.0 89.5 J 557 709 329 332 22.0 300
05/14/14 91.9 J 175 J 1990 1530 168 J 295 J 22.0 300
11/11/14 48.3 J 258 J 498 1510 303 663 22.0 300
05/13/15 83.1 J 118 J 540 1210 119 J 296 J 22.0 300
11/10/15 151 J 356 197 J 1040 170 J 408 22.0 300
average = 16599.91 18248.57 -4586.90 -1682.94 1255.60 923.53 5776.46 -550.50
standard deviation = 46339.72 16666.27 -4082.79 -1268.20 1700.35 444.29 6095.81 -236.86
LOD SWSLMW-209 MW-210D QA/QCMW-211RMW-210ConstituentSample Date MW-4 MW-204DMW-5 MW-110S MW-110D MW-204SMW-201R
INORGANIC CONSTITUENTS: TOTAL METALS
HISTORY OF CHEMICAL ANALYSIS
FACILITY: ACTIVE C&D FACILITY
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM
lead 04/17/90 <5 <5
MCL = 15 07/11/91 7.3 <5
FBAC = 10 (SWSL)05/28/92 <10 18.3
NCGQS = 15 (2L Std)06/30/93 <5
11/04/94 <10
12/20/94 <10
02/02/95 <10
03/13/95 <10 40
05/18/95 17.3 B 31.1 B
07/20/95 <10 37
11/15/95 <10 54 J
11/28/95 <10 163 J
02/28/96 21 B 18 B
07/25/96 <10
08/27/96 <10 13
02/25/97 <10 16 B <10 <10
09/03/97 <10 <10 14 B
03/25/98 <10 <10
05/04/98 <10 37
11/02/98 <10 <10 <10
04/26/99 <10 <10 <10
11/22/99 <10 <10 <10
05/23/00 <10 <10 <10 <10
11/29/00 <10 <10 <10
05/30/01 <10 40
06/05/01 <10 <10
11/13/01 <10 <10 31
06/04/02 <10 <10 27
03/12/03 <10 <10
06/18/03 <10 <10
12/08/03 <10 <10
06/22/04 <10 <10
11/30/04 <10 <10
06/01/05 <10
06/06/05 <10 16
11/02/05 <10 <10 <10
11/09/05 <10 <10 <10 <10
05/23/06 <10 <10 12 <10 <10 <10 <10
11/17/06 <10 <10 <10 <10 <10 <10 <10
06/13/07 6.6 JB <2 22.1 <2 4.4 JB 5.7 JB 3.2 JB 2 10 f
12/12/07 <2 <2 4.4 J <2 <2 <2 7.5 J 2 10
06/11/08 <2 8.5 JB <2 5.5 JB 5 JB 2 JB 3.4 JB <2 2 10 i
11/06/08 <2 3.9 J <2 10 JB <2 3.3 J 2 J 4.2 J 2 10 i
05/20/09 <1.6 3.3 J <1.6 1.6 J <1.6 3.5 J <1.6 <1.6 <1.6 1.6 10
11/19/09 <1.9 5.31 J <1.9 <1.9 <1.9 4.23 J <1.9 2.89 J <1.9 1.9 10
06/23/10 3.87 J <1.9 <1.9 <1.9 <1.9 <1.9 <1.9 <1.9 14.8 1.9 10
11/17/10 1.98 J 3.26 J <1.9 3.07 J <1.9 <1.9 <1.9 2.87 J 29.9 1.9 10
05/24/11 <1.9 4.62 J <1.9 5.61 J <1.9 <1.9 <1.9 4.16 J 2.44 J 1.9 10
11/17/11 <1.9 <1.9 <1.9 <1.9 <1.9 <1.9 8.32 J 1.9 10
06/05/12 <1.9 <1.9 <1.9 2.62 J <1.9 <1.9 <1.9 <1.9 1.9 10
11/14/12 2.36 J <1.9 2.79 J 2.13 J 5.83 J <1.9 1.9 10
05/13/13 <2.1 <2.1 <2.1 <2.1 6.48 J <2.1 2.1 10
11/12/13 <2.10 <2.10 <2.10 <2.10 2.62 J <2.10 2.10 10
05/14/14 <2.10 <2.10 <2.10 2.49 J <2.10 <2.10 2.10 10
11/11/14 <2.10 <2.10 <2.10 <2.10 <2.10 <2.10 2.10 10
05/13/15 <3.10 <3.10 <3.10 <3.10 <3.10 <3.10 3.10 10
11/10/15 <3.10 4.07 J <3.10 3.95 J <3.10 <3.10 3.10 10
average = 7.30 --22.10 ----22.35 --
standard deviation = --------10.68 --
LOD SWSLMW-209 MW-210D QA/QCMW-211RMW-210ConstituentSample Date MW-4 MW-204DMW-5 MW-110S MW-110D MW-204SMW-201R
INORGANIC CONSTITUENTS: TOTAL METALS
HISTORY OF CHEMICAL ANALYSIS
FACILITY: ACTIVE C&D FACILITY
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM
manganese 04/17/90
MCL =07/11/91
FBAC = 50 (SWSL)05/28/92
NCGQS = 50 (2L Std)06/30/93
11/04/94
12/20/94
02/02/95
03/13/95
05/18/95
07/20/95
11/15/95
11/28/95
02/28/96
07/25/96
08/27/96
02/25/97
09/03/97
03/25/98
05/04/98
11/02/98
04/26/99
11/22/99
05/23/00
11/29/00
05/30/01
06/05/01
11/13/01
06/04/02
03/12/03
06/18/03
12/08/03
06/22/04
11/30/04
06/01/05
06/06/05
11/02/05
11/09/05
05/23/06
11/17/06
06/13/07 7.8 J 6 J 63 118 179 368 1780 0.2 50 t, f
12/12/07 11.3 J 17.6 J 32 J 205 283 259 956 0.2 50
06/11/08 23.3 J 10400 8.4 JB 44 292 296 195 4460 0.2 50 t, i
11/06/08 6.7 JB 1250 39.4 J 33.8 JB 304 426 132 5190 0.2 50 f
05/20/09 16.4 J 8820 6 J 70.3 906 334 307 379 6870 1.1 50
11/19/09 9.89 J 11100 7.91 J 55.4 581 269 357 340 3540 1.1 50
06/23/10 149 9260 13 J 62.8 1080 217 229 1630 5520 1.1 50
11/17/10 42.2 J 15800 6.99 J 48.3 J 2150 252 246 907 3250 1.1 50 i
05/24/11 41.9 J 14300 9.4 J 65.7 788 336 189 621 1710 1.1 50 i
11/17/11 15.9 J 57.3 14.1 J 350 301 400 1730 1.1 50
06/05/12 65.4 5.24 J 54.7 416 257 575 1630 1340 1.1 50
11/14/12 7.70 J 12.7 J 522 554 2910 1470 1.1 50
05/13/13 6.88 J 4.75 JB 320 534 1100 1250 1.1 50 i
11/12/13 1.22 J 10.8 J 362 895 944 1160 1.10 50
05/14/14 3.99 J 9.97 J 733 455 715 1400 1.10 50
11/11/14 1.66 J 16.8 J 530 505 786 1450 1.10 50
05/13/15 2.39 J 9.24 J 447 374 581 1560 1.10 50 i
11/10/15 4.52 JB 7.71 J 320 365 719 1810 1.10 50 i
average = -10132.86 -59.41 1101.00 351.50 279.09 527.11 3126.62 749.00 1430.00
standard deviation = -4688.26 -8.74 613.85 141.21 71.72 343.00 1889.42 131.98 199.14
LOD SWSLMW-209 MW-210D QA/QCMW-211RMW-210ConstituentSample Date MW-4 MW-204DMW-5 MW-110S MW-110D MW-204SMW-201R
INORGANIC CONSTITUENTS: TOTAL METALS
HISTORY OF CHEMICAL ANALYSIS
FACILITY: ACTIVE C&D FACILITY
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM
mercury 04/17/90 <0.2 <0.2
MCL = 2 07/11/91 <0.2 0.58
FBAC = 0.2 (SWSL)05/28/92 <0.2 <0.2
NCGQS = 1 (2L Std)06/30/93 <0.2
2L Std = 1.05 (pre-Jan. 2010)11/04/94
2L Std = 1 (Jan. 2010)12/20/94
02/02/95
03/13/95
05/18/95
07/20/95
11/15/95
11/28/95
02/28/96
07/25/96
08/27/96
02/25/97 <0.5 <0.5
09/03/97
03/25/98
05/04/98
11/02/98 <0.2
04/26/99
11/22/99 <0.2
05/23/00 0.6 J <0.2
11/29/00 <0.2
05/30/01
06/05/01 0.3
11/13/01
06/04/02 <0.2
03/12/03 <0.2
06/18/03 <0.2
12/08/03 <0.2
06/22/04 <0.2
11/30/04 <0.2
06/01/05 <0.2
06/06/05
11/02/05 <0.2
11/09/05 <0.2 <0.2 <0.2 <0.2
05/23/06 <0.2 <0.2 <0.2 <0.2 <0.2
11/17/06 <0.2 <0.2 <0.2 <0.2 <0.2
06/13/07 <0.01 <0.01 <0.01 <0.01 <0.01 0.02 J <0.01 0.01 0.2
12/12/07 0.02 JB <0.01 <0.01 0.06 JB <0.01 0.03 JB 0.16 JB 0.01 0.2 t,i
06/11/08 0.1 JB 0.04 JB 0.06 JB 0.08 JB 0.11 JB 0.18 JB 0.13 JB <0.2 0.01 0.2 t, i
11/06/08 0.14 JB <0.01 0.16 JB 0.13 JB 0.05 JB 0.17 JB 0.09 JB 0.1 JB 0.01 0.2 t, f, i
05/20/09 <0.05 0.05 0.2
11/19/09 <0.054 0.117 J <0.054 <0.054 0.149 J <0.054 0.0611 J 0.182 J <0.054 0.054 0.2
06/23/10 <0.17 <0.17 <0.17 <0.17 <0.17 <0.17 <0.17 <0.17 <0.17 0.17 0.2
11/17/10 <0.17 <0.17 <0.17 <0.17 <0.17 <0.17 <0.17 <0.17 <0.17 0.17 0.2
05/24/11 <0.17 <0.17 <0.17 <0.17 <0.17 <0.17 <0.17 <0.17 <0.17 0.17 0.2
11/17/11 <0.17 <0.17 <0.17 <0.17 <0.17 <0.17 0.269 0.17 0.2
06/05/12 <0.17 <0.17 <0.17 <0.17 <0.17 <0.17 <0.17 <0.17 0.17 0.2
11/14/12 <0.17 <0.17 <0.17 <0.17 <0.17 <0.17 0.17 0.2
05/13/13 <0.17 <0.17 <0.17 <0.17 <0.17 <0.17 0.17 0.2
11/12/13 <0.170 <0.170 <0.170 <0.170 <0.170 <0.170 0.170 0.2
05/14/14 <0.170 <0.170 <0.170 <0.170 <0.170 <0.170 0.170 0.2
11/11/14 <0.170 <0.170 <0.170 <0.170 <0.170 <0.170 0.170 0.2
05/13/15 <0.170 <0.170 <0.170 <0.170 <0.170 <0.170 0.170 0.2
11/10/15 <0.170 <0.170 <0.170 0.223 <0.170 0.229 0.170 0.2
average = 0.30 ----------
standard deviation = -----------
LOD SWSLMW-209 MW-210D QA/QCMW-211RMW-210ConstituentSample Date MW-4 MW-204DMW-5 MW-110S MW-110D MW-204SMW-201R
INORGANIC CONSTITUENTS: TOTAL METALS
HISTORY OF CHEMICAL ANALYSIS
FACILITY: ACTIVE C&D FACILITY
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM
nickel 04/17/90
MCL =07/11/91
FBAC = 50 (SWSL)05/28/92
NCGQS = 100 (2L Std)06/30/93
11/04/94
12/20/94
02/02/95
03/13/95
05/18/95
07/20/95
11/15/95
11/28/95
02/28/96
07/25/96
08/27/96
02/25/97
09/03/97
03/25/98
05/04/98
11/02/98
04/26/99
11/22/99
05/23/00
11/29/00
05/30/01
06/05/01
11/13/01
06/04/02
03/12/03
06/18/03
12/08/03
06/22/04
11/30/04
06/01/05
06/06/05
11/02/05
11/09/05
05/23/06
11/17/06
06/13/07
12/12/07 2.6 JB 2.6 JB 2.4 JB 2.2 JB <0.6 0.9 JB 3.2 JB 0.6 50 t,i
06/11/08 <0.6 3.8 J <0.6 1.8 J 3.3 J <0.6 <0.6 1.5 J 0.6 50
11/06/08 9.2 J 8.8 J 1.8 JB 10.9 JB 12 J 18.4 J 2.8 J 7.7 J 0.6 50 t, f
05/20/09 <0.6 3.2 J 1.1 J 2.5 J 1.4 J 1.3 J <0.6 <0.6 4.9 J 0.6 50
11/19/09 <1.8 <1.8 <1.8 <1.8 <1.8 <1.8 <1.8 <1.8 <1.8 1.8 50
06/23/10 <1.8 <1.8 <1.8 <1.8 <1.8 <1.8 <1.8 <1.8 2.72 J 1.8 50
11/17/10 <1.8 2.72 J <1.8 2.2 J <1.8 <1.8 <1.8 <1.8 4.01 J 1.8 50
05/24/11 <1.8 1.81 J <1.8 2.97 J <1.8 <1.8 <1.8 <1.8 <1.8 1.8 50
11/17/11 <1.8 2.1 J <1.8 1.95 J <1.8 <1.8 2.75 J 1.8 50
06/05/12 <1.8 <1.8 1.89 J <1.8 <1.8 <1.8 2.47 J <1.8 1.8 50
11/14/12 <1.8 <1.8 <1.8 <1.8 2.07 J <1.8 1.8 50
05/13/13 <1.8 1.91 J <1.8 <1.8 <1.8 <1.8 1.8 50
11/12/13 <1.80 <1.80 <1.80 <1.80 <1.80 <1.80 1.80 50
05/14/14 <1.80 <1.80 <1.80 <1.80 <1.80 <1.80 1.80 50
11/11/14 <1.80 <1.80 1.92 J <1.80 <1.80 <1.80 1.80 50
05/13/15 <1.80 3.39 J 2.80 J 4.27 J <1.80 3.49 J 1.80 50
11/10/15 <1.80 <1.80 <1.80 <1.80 <1.80 <1.80 1.80 50
average = -----------
standard deviation = -----------
LOD SWSLMW-209 MW-210D QA/QCMW-211RMW-210ConstituentSample Date MW-4 MW-204DMW-5 MW-110S MW-110D MW-204SMW-201R
INORGANIC CONSTITUENTS: TOTAL METALS
HISTORY OF CHEMICAL ANALYSIS
FACILITY: ACTIVE C&D FACILITY
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM
selenium 04/17/90
MCL = 50 07/11/91
FBAC = 10 (SWSL)05/28/92
NCGQS = 20 (2L Std)06/30/93
2L Std = 50 (pre-Jan. 2010)11/04/94
2L Std = 20 (Jan. 2010)12/20/94
02/02/95
03/13/95
05/18/95
07/20/95
11/15/95
11/28/95
02/28/96
07/25/96
08/27/96
02/25/97
09/03/97
03/25/98
05/04/98
11/02/98
04/26/99
11/22/99
05/23/00
11/29/00
05/30/01
06/05/01
11/13/01
06/04/02
03/12/03
06/18/03
12/08/03
06/22/04
11/30/04
06/01/05
06/06/05
11/02/05
11/09/05
05/23/06
11/17/06
06/13/07
12/12/07
06/11/08
11/06/08
05/20/09 <3.4 <3.4 5 J 5.9 J <3.4 <3.4 <3.4 6.1 J <3.4 3.4 10
11/19/09 <2.7 <2.7 <2.7 <2.7 <2.7 <2.7 <2.7 <2.7 <2.7 2.7 10
06/23/10 <0.83 <0.83 <0.83 <0.83 <0.83 0.926 J <0.83 1.43 J 10.4 0.83 10
11/17/10 <0.83 10.9 B <0.83 <0.83 <0.83 <0.83 <0.83 1.89 J 5.09 J 0.83 10 i
05/24/11 <0.83 <0.83 <0.83 <0.83 0.998 J 1.4 J <0.83 3.23 J 10.1 0.83 10
11/17/11 <0.83 <0.83 <0.83 0.948 J <0.83 2.61 J 2.73 J 0.83 10
06/05/12 <0.83 <0.83 <0.83 <0.83 <0.83 1.72 J <0.83 <0.83 0.83 10
11/14/12 <0.83 <0.83 <0.83 2.84 J <0.83 <0.83 0.83 10
05/13/13 <0.91 <0.91 <0.91 2.45 J <0.91 <0.91 0.91 10
11/12/13 <0.910 <0.910 <0.910 1.98 J <0.910 <0.910 0.910 10
05/14/14 <0.910 <0.910 <0.910 3.12 J <0.910 <0.910 0.910 10
11/11/14 <0.910 <0.910 <0.910 2.34 J <0.910 <0.910 0.910 10
05/13/15 <0.910 <0.910 <0.910 3.60 J <0.910 <0.910 0.910 10
11/10/15 <0.910 <0.910 <0.910 3.09 J <0.910 <0.910 0.910 10
average = --------10.25 --
standard deviation = --------0.21 --
LOD SWSLMW-209 MW-210D QA/QCMW-211RMW-210ConstituentSample Date MW-4 MW-204DMW-5 MW-110S MW-110D MW-204SMW-201R
INORGANIC CONSTITUENTS: TOTAL METALS
HISTORY OF CHEMICAL ANALYSIS
FACILITY: ACTIVE C&D FACILITY
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM
silver 04/17/90
MCL =07/11/91
FBAC = 10 (SWSL)05/28/92
NCGQS = 20 (2L Std)06/30/93
2L Std = 17.5 (pre-Jan. 2010)11/04/94
2L Std = 20 (Jan. 2010)12/20/94
02/02/95
03/13/95
05/18/95 <10 <10
07/20/95 <10 <10
11/15/95
11/28/95 <10 <10
02/28/96 <10 <10
07/25/96
08/27/96 <10 <10
02/25/97 <10 <10
09/03/97 <10 <10
03/25/98 10 B 14 B
05/04/98
11/02/98 <10 <10
04/26/99 <10 <10
11/22/99 <10 <10
05/23/00 <10 <10
11/29/00 <10 <10 <10
05/30/01 <10 <10
06/05/01 <10 <10
11/13/01 <10 <10 <10
06/04/02 <10 <10 <10
03/12/03 <10 <10
06/18/03 <10 <10
12/08/03 <10 <10
06/22/04 <10 <10
11/30/04 <10 <10
06/01/05 <10
06/06/05
11/02/05 <10 <10
11/09/05 <10 <10 <10 <10
05/23/06 <10 <10 <10 <10 <10 <10 <10
11/17/06 <10 <10 <10 <10 <10 <10 <10
06/13/07 <1.1 <1.1 <1.1 <1.1 <1.1 <1.1 <1.1 1.1 10
12/12/07 <1.1 <1.1 <1.1 <1.1 <1.1 <1.1 <1.1 1.1 10
06/11/08 <1.1 <1.1 <1.1 <1.1 <1.1 1.6 JB 1.6 JB <1.1 1.1 10 i
11/06/08 <1.1 <1.1 <1.1 <1.1 <1.1 3.9 JB <1.1 <1.1 1.1 10 i
05/20/09 <1 2 J <1 <1 <1 <1 <1 <1 2.1 J 1 10
11/19/09 <1.9 2.68 J <1.9 <1.9 <1.9 <1.9 <1.9 <1.9 <1.9 1.9 10
06/23/10 <1.9 <1.9 <1.9 <1.9 <1.9 <1.9 <1.9 <1.9 <1.9 1.9 10
11/17/10 <1.9 5.16 J <1.9 <1.9 <1.9 <1.9 <1.9 <1.9 2.04 J 1.9 10
05/24/11 <1.9 3.42 J <1.9 <1.9 <1.9 <1.9 <1.9 <1.9 <1.9 1.9 10
11/17/11 <1.9 <1.9 <1.9 <1.9 <1.9 <1.9 <1.9 1.9 10
06/05/12 <1.9 <1.9 <1.9 <1.9 <1.9 <1.9 3.28 J <1.9 1.9 10
11/14/12 <1.9 <1.9 <1.9 <1.9 <1.9 <1.9 1.9 10
05/13/13 <1.9 2.13 J <1.9 <1.9 <1.9 <1.9 1.9 10
11/12/13 <1.90 <1.90 <1.90 <1.90 <1.90 <1.90 1.90 10
05/14/14 <1.90 <1.90 <1.90 <1.90 <1.90 <1.90 1.90 10
11/11/14 1.96 JB <1.90 <1.90 <1.90 <1.90 <1.90 1.90 10 i
05/13/15 <1.90 <1.90 <1.90 <1.90 <1.90 <1.90 1.90 10
11/10/15 <1.90 <1.90 <1.90 <1.90 <1.90 <1.90 1.90 10
average = -----------
standard deviation = -----------
LOD SWSLMW-209 MW-210D QA/QCMW-211RMW-210ConstituentSample Date MW-4 MW-204DMW-5 MW-110S MW-110D MW-204SMW-201R
INORGANIC CONSTITUENTS: TOTAL METALS
HISTORY OF CHEMICAL ANALYSIS
FACILITY: ACTIVE C&D FACILITY
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM
thallium 04/17/90
MCL = 2 07/11/91
FBAC = 5.5 (SWSL)05/28/92
NCGQS = 0.2 (GWPS)06/30/93
11/04/94
12/20/94
02/02/95
03/13/95
05/18/95
07/20/95
11/15/95
11/28/95
02/28/96
07/25/96
08/27/96
02/25/97
09/03/97
03/25/98
05/04/98
11/02/98
04/26/99
11/22/99
05/23/00
11/29/00
05/30/01
06/05/01
11/13/01
06/04/02
03/12/03
06/18/03
12/08/03
06/22/04
11/30/04
06/01/05
06/06/05
11/02/05
11/09/05
05/23/06
11/17/06
06/13/07 <2.7 4.2 JB <2.7 8 B 4.5 JB 4.6 JB <2.7 2.7 5.5 t, i
12/12/07 <2.7 <2.7 <2.7 <2.7 <2.7 <2.7 <2.7 2.7 5.5
06/11/08 <2.7 <2.7 <2.7 <2.7 <2.7 <2.7 <2.7 <2.7 2.7 5.5
11/06/08 <2.7 <2.7 <2.7 4.7 JB <2.7 3.2 JB <2.7 <2.7 2.7 5.5 i
05/20/09 <0.036 0.061 JB <0.036 <0.036 <0.036 <0.036 <0.036 <0.036 <0.036 0.036 5.5 i
11/19/09 0.26 J <0.11 <0.11 <0.11 <0.11 <0.11 <0.11 <0.11 <0.11 0.11 5.5
06/23/10 <0.11 <0.11 <0.11 <0.11 <0.11 <0.11 <0.11 <0.11 <0.11 0.11 5.5
11/17/10 <0.11 <0.11 <0.11 <0.11 <0.11 <0.11 <0.11 <0.11 <0.11 0.11 5.5
05/24/11 0.38 J 0.437 J <0.11 <0.11 <0.11 0.136 J <0.11 0.16 J <0.11 0.11 5.5
11/17/11 0.129 J <0.11 <0.11 <0.11 <0.11 0.173 J <0.11 0.11 5.5
06/05/12 <0.11 <0.11 <0.11 <0.11 <0.11 <0.11 <0.11 <0.11 0.11 5.5
11/14/12 <0.11 <0.11 <0.11 <0.11 <0.11 <0.11 0.11 5.5
05/13/13 <0.11 <0.11 <0.11 <0.11 <0.11 <0.11 0.11 5.5
11/12/13 <0.110 <0.110 <0.110 <0.110 <0.110 <0.110 0.110 5.5
05/14/14 <0.110 <0.110 <0.110 <0.110 <0.110 <0.110 0.110 5.5
11/11/14 0.347 J <0.110 <0.110 <0.110 <0.110 <0.110 0.110 5.5
05/13/15 <0.110 <0.110 <0.110 <0.110 <0.110 <0.110 0.110 5.5
11/10/15 <0.110 <0.110 <0.110 <0.110 <0.110 <0.110 0.110 5.5
average = -----------
standard deviation = -----------
LOD SWSLMW-209 MW-210D QA/QCMW-211RMW-210ConstituentSample Date MW-4 MW-204DMW-5 MW-110S MW-110D MW-204SMW-201R
INORGANIC CONSTITUENTS: TOTAL METALS
HISTORY OF CHEMICAL ANALYSIS
FACILITY: ACTIVE C&D FACILITY
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM
tin 04/17/90
MCL = 07/11/91
FBAC = 100 (SWSL)05/28/92
NCGQS =2000 (GWPS)06/30/93
GWPS = 2100 (pre-Oct. 2010)11/04/94
GWPS = 2000 (Oct. 2010)12/20/94
02/02/95
03/13/95
05/18/95
07/20/95
11/15/95
11/28/95
02/28/96
07/25/96
08/27/96
02/25/97
09/03/97
03/25/98
05/04/98
11/02/98
04/26/99
11/22/99
05/23/00
11/29/00
05/30/01
06/05/01
11/13/01
06/04/02
03/12/03
06/18/03
12/08/03
06/22/04
11/30/04
06/01/05
06/06/05
11/02/05
11/09/05
05/23/06
11/17/06
06/13/07
12/12/07
06/11/08
11/06/08
05/20/09
11/19/09
06/23/10
11/17/10
05/24/11
11/17/11
06/05/12 2.97 J 2.1 100
11/14/12
05/13/13 <2.1 2.1 100
11/12/13
05/14/14 <2.10 2.10 100
11/11/14
05/13/15 <2.40 2.40 100
11/10/15
average = -----------
standard deviation = -----------
LOD SWSLMW-209 MW-210D QA/QCMW-211RMW-210ConstituentSample Date MW-4 MW-204DMW-5 MW-110S MW-110D MW-204SMW-201R
INORGANIC CONSTITUENTS: TOTAL METALS
HISTORY OF CHEMICAL ANALYSIS
FACILITY: ACTIVE C&D FACILITY
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM
vanadium 04/17/90
MCL =07/11/91
FBAC = 25 (SWSL)05/28/92
NCGQS = 0.3 (GWPS)06/30/93
GWPS = 3.5 (pre-Oct. 2010)11/04/94
GWPS = 0.3 (Oct. 2010)12/20/94
02/02/95
03/13/95
05/18/95
07/20/95
11/15/95
11/28/95
02/28/96
07/25/96
08/27/96
02/25/97
09/03/97
03/25/98
05/04/98
11/02/98
04/26/99
11/22/99
05/23/00
11/29/00
05/30/01
06/05/01
11/13/01
06/04/02
03/12/03
06/18/03
12/08/03
06/22/04
11/30/04
06/01/05
06/06/05
11/02/05
11/09/05
05/23/06
11/17/06
06/13/07 1.5 J <0.4 <0.4 7.6 J <0.4 <0.4 1.5 J 0.4 25
12/12/07 <0.4 <0.4 <0.4 1.6 J <0.4 <0.4 4.6 J 0.4 25
06/11/08 2.1 JB 5.2 J <0.4 1.9 JB 3.3 J <0.4 1.8 JB 3.7 J 0.4 25 t, f, i
11/06/08 1.2 JB 2.4 JB <0.4 1.4 JB 0.8 JB <0.4 1 JB 1.1 JB 0.4 25 f
05/20/09 2.9 J <0.7 <0.7 1 J <0.7 2.8 J <0.7 <0.7 <0.7 0.7 25
11/19/09 2.24 J <1.4 <1.4 <1.4 <1.4 3.38 J <1.4 <1.4 <1.4 1.4 25
06/23/10 22.3 J 1.82 J <1.4 <1.4 <1.4 <1.4 <1.4 1.42 J 10.9 J 1.4 25
11/17/10 7.64 J <1.4 <1.4 <1.4 <1.4 <1.4 <1.4 <1.4 32.3 1.4 25
05/24/11 6.8 J 2.44 J <1.4 1.6 J <1.4 <1.4 <1.4 4.05 J <1.4 1.4 25
11/17/11 3.23 J <1.4 <1.4 3.43 J <1.4 1.8 J 9.55 J 1.4 25
06/05/12 10.4 J <1.4 <1.4 2.11 J <1.4 2.75 J <1.4 <1.4 1.4 25
11/14/12 1.76 J <1.4 <1.4 <1.4 <1.4 <1.4 1.4 25
05/13/13 1.81 J <1.4 <1.4 <1.4 4.28 J <1.4 1.4 25
11/12/13 <1.40 <1.40 <1.40 <1.40 <1.40 <1.40 1.40 25
05/14/14 <1.40 <1.40 <1.40 4.00 J <1.40 <1.40 1.40 25
11/11/14 <1.40 <1.40 <1.40 3.70 J <1.40 <1.40 1.40 25
05/13/15 <1.40 <1.40 <1.40 3.13 J <1.40 <1.40 1.40 25
11/10/15 1.60 J 1.51 J <1.40 3.26 J <1.40 <1.40 1.40 25
average = -----------
standard deviation = -----------
LOD SWSLMW-209 MW-210D QA/QCMW-211RMW-210ConstituentSample Date MW-4 MW-204DMW-5 MW-110S MW-110D MW-204SMW-201R
INORGANIC CONSTITUENTS: TOTAL METALS
HISTORY OF CHEMICAL ANALYSIS
FACILITY: ACTIVE C&D FACILITY
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM
zinc 04/17/90
MCL =07/11/91
FBAC = 10 (SWSL)05/28/92
NCGQS = 1000 (2L Std)06/30/93
2L Std = 1050 (pre-Jan. 2010)11/04/94
2L Std = 1000 (Jan. 2010)12/20/94
02/02/95
03/13/95
05/18/95
07/20/95
11/15/95
11/28/95
02/28/96
07/25/96
08/27/96
02/25/97
09/03/97
03/25/98
05/04/98
11/02/98
04/26/99
11/22/99
05/23/00
11/29/00
05/30/01
06/05/01
11/13/01
06/04/02
03/12/03
06/18/03
12/08/03
06/22/04
11/30/04
06/01/05
06/06/05
11/02/05
11/09/05
05/23/06
11/17/06
06/13/07 28.1 B 14.8 B 20.7 B 21.6 B 37.7 B 44 B 20.2 B 2.7 10 t
12/12/07 20.9 B 17.2 B 12.4 B 21.2 B 19.9 B 52.7 165 2.7 10 t,i
06/11/08 <2.7 <2.7 <2.7 <2.7 <2.7 <2.7 <2.7 <2.7 2.7 10
11/06/08 8.1 JB 12.4 B <2.7 13.2 B 7.7 JB 6.5 JB 28.4 B 13.6 B 2.7 10 i
05/20/09 14.2 15 <3.4 4.8 J 35.5 15.9 <3.4 33.2 12.3 3.4 10
11/19/09 11.1 11.6 <3.8 9.22 J 19.9 12.7 <3.8 24.8 9.16 J 3.8 10
06/23/10 82 9.32 J 6.9 J 4.9 J 8.01 J 10.3 <3.8 25.7 61.5 3.8 10
11/17/10 26.6 4.21 J 3.83 J 4.47 J 4.24 J 5.11 J <3.8 28.3 206 3.8 10
05/24/11 27.7 6.55 J 4.01 J 4.88 J 4.18 J <3.8 <3.8 37.7 11.3 3.8 10
11/17/11 13.8 4.42 J <3.8 11.4 <3.8 22.5 40.6 3.8 10
06/05/12 45.2 <3.8 <3.8 9.07 J <3.8 32.7 10.8 12.3 3.8 10
11/14/12 17 <3.8 4.02 J 24.8 22.7 18.3 3.8 10
05/13/13 8.63 J <3.8 <3.8 19.5 26.9 14.3 3.8 10
11/12/13 7.24 J 4.06 J <3.80 19.9 <3.80 14.9 3.80 10
05/14/14 7.44 J <3.80 6.72 J 36.1 <3.80 18.8 3.80 10
11/11/14 14.6 10.8 8.55 J 38.9 <3.80 18.2 3.80 10
05/13/15 9.30 J 4.16 J 6.52 J 40.6 <3.80 20.6 3.80 10
11/10/15 7.09 J <3.80 <3.80 36.8 <3.80 21.0 3.80 10
average = 28.02 13.30 --27.70 12.58 -31.61 61.90 -17.30
standard deviation = 22.89 2.40 --11.03 2.42 -9.15 72.67 -3.13
LOD SWSLMW-209 MW-210D QA/QCMW-211RMW-210ConstituentSample Date MW-4 MW-204DMW-5 MW-110S MW-110D MW-204SMW-201R
INORGANIC CONSTITUENTS: TOTAL METALS
HISTORY OF CHEMICAL ANALYSIS
FACILITY: ACTIVE C&D FACILITY
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM
All results in µg/L.
Shaded cells indicate data not available.
Upgradient well shaded yellow.
Blue bolded values indicate concentrations that exceeded the FBAC.
Red bolded values indicate concentrations that exceeded the NCGQS.
Green bolded cells indicate concentrations that were >LOD but <SWSL,
or >LOD but <Method Reporting Limit, if no SWSL.
B - detect associated with blank contamination J - concentration is estimated
i - found in instrument blank t - found in trip blank
f - found in field blank ic - initial calibration beyond limits
cc - continuing calibration beyond limits d - duplicates beyond limits
ss - surrogate spikes beyond limits is - internal standard beyond limits
sd - serial dilution beyond limits ms - matrix spike beyond limits
ics - interference check sample beyond limits lcs – laboratory control sample beyond limits
q – reporting limit standard beyond limits msd - matrix spike duplicate beyond limits
FBAC – facility background NCGQS - Groundwater Standard, as established by the NCDENR
SWSL - solid waste section limit, as established by NCDENR SPL – statistical prediction limit
GWPS - ground water protection standard
NE - Not Established
R00592-162
INORGANIC CONSTITUENTS: TOTAL METALS
LOCATION: CHAPEL HILL, NORTH CAROLINAPROJECT: GROUNDWATER MONITORING PROGRAM
HISTORY OF CHEMICAL ANALYSIS
CLIENT: THE COUNTY OF ORANGEFACILITY: ORANGE COUNTY REGIONAL LANDFILL - NORTH FACILITY

GENERAL CHEMISTRY

alkalinity 04/17/90
MCL =07/11/91
FBAC = 05/28/92
NCGQS = 06/30/93
11/04/94
12/20/94
02/02/95
03/13/95
05/18/95
07/20/95
11/15/95
11/28/95
02/28/96
07/25/96
08/27/96
02/25/97
09/03/97
03/25/98
05/04/98
11/02/98
04/26/99
11/22/99
05/23/00
11/29/00
05/30/01
06/05/01
11/13/01
06/04/02
03/12/03
06/18/03
12/08/03
06/22/04
11/30/04
06/01/05
06/06/05
11/02/05
11/09/05
05/23/06
11/17/06
06/13/07 21000 29000 42000 95000 162000 59000 74000 1000
12/12/07 19800 29700 18700 150000 150000 63800 39600 1000
06/11/08 23100 45100 33000 48400 163000 169000 68200 189000 1000 t
11/06/08 22000 B 59400 B 33000 B 4400 B 169000 165000 55000 B 189000 1000 f
05/20/09 17000 23000 31000 45000 36000 160000 160000 46000 140000 8300
11/19/09 24000 33000 25000 62000 34000 190000 160000 43000 120000 8300
06/23/10 27000 30000 37000 49000 170000 180000 160000 66000 120000 8000
11/17/10 16000 150000 30000 43000 260000 150000 160000 52000 91000 8000
05/24/11 24000 63000 40000 46000 200000 180000 160000 61000 140000 12000
11/17/11 15000 54000 22000 190000 160000 54000 91000 12000
06/06/12 22000 34000 47000 180000 160000 73000 140000 <12000 12000
11/14/12 23000 31000 250000 73000 120000 30000 12000
05/13/13 27000 34000 180000 91000 160000 25000 14000
11/12/13 22000 32000 200000 95000 190000 28000 14000
05/13/14 21000 38000 310000 89000 190000 17000 140000
11/11/14 27000 42000 380000 99000 220000 35000 14000
05/13/15 27000 38000 330000 100000 180000 D 28000 14000
11/10/15 21000 28000 280000 78000 180000 D 34000 14000
average = 22170.59 57350.00 34452.94 42310.00 140000.00 207611.11 160545.45 71235.29 124123.08 200000.00 28142.86standard deviation = 3771.23 47511.84 6786.95 12836.10 101183.00 73168.73 4546.73 18317.92 43169.40 17320.51 6039.55
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
FACILITY: ACTIVE C&D FACILITY
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM
QA/QCMW-110S
HISTORY OF CHEMICAL ANALYSIS
INORGANIC CONSTITUENTS: GENERAL CHEMISTRY
Constituent Sample Date LODMW-204SMW-110D MW-204D SWSLMW-5 MW-209 MW-210DMW-4 MW-201R MW-211RMW-210
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
FACILITY: ACTIVE C&D FACILITY
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM
QA/QCMW-110S
HISTORY OF CHEMICAL ANALYSIS
INORGANIC CONSTITUENTS: GENERAL CHEMISTRY
Constituent Sample Date LODMW-204SMW-110D MW-204D SWSLMW-5 MW-209 MW-210DMW-4 MW-201R MW-211RMW-210
chloride 04/17/90
MCL =07/11/91
FBAC = 05/28/92
NCGQS = 250000 (2L Std) 06/30/93
11/04/94
12/20/94
02/02/95
03/13/95
05/18/95
07/20/95
11/15/95
11/28/95
02/28/96
07/25/96
08/27/96
02/25/97
09/03/97
03/25/98
05/04/98
11/02/98
04/26/99
11/22/99
05/23/00
11/29/00
05/30/01
06/05/01
11/13/01
06/04/02
03/12/03
06/18/03
12/08/03
06/22/04
11/30/04
06/01/05
06/06/05
11/02/05
11/09/05
05/23/06
11/17/06
06/13/07 4000 2500 2500 5500 2500 6000 122000 1000
12/12/07 6500 B 5000 B 5000 B 33500 4000 B 5500 B 70500 1000 t, f
06/11/08 5500 7000 3500 3500 7000 3000 7500 80500 1000
11/06/08 7000 B 7500 B 5000 B 3000 B 6000 B 3500 B 7500 B 150000 1000 t, f
05/20/09 5700 5200 3500 J 3400 J 16000 14000 4300 J 9200 200000 18
11/19/09 6100 B 4800 JB 3600 JB 3600 JB 6400 B 19000 4200 JB 9000 B 140000 18 f
06/23/10 5800 5700 3800 J 3700 J 6400 25000 4400 J 11000 310000 18
11/17/10 6000 B 4800 JB 3400 JB 3400 JB 6400 B 12000 3900 JB 13000 140000 18 i
05/24/11 6000 B 5200 B 3400 JB 3400 JB 5000 B 16000 B 3800 B 10000 250000 47 i
11/17/11 5900 B 3000 JB 3000 JB 11000 3300 JB 9900 140000 47 i
06/06/12 6000 B 3000 JB 2900 JB 14000 B 3400 JB 8900 B 440000 B 3200 JB 430 i
11/14/12 6200 B 3000 JB 22000 9300 270000 3300 JB 430 i
05/13/13 6700 3200 J 7900 9700 14000 3500 J 2200
11/12/13 6000 3000 J 6000 11000 17000 3300 J 2200
05/13/14 5800 3300 J 34000 9900 16000 3600 J 2200
11/11/14 6100 3100 J 33000 9300 18000 3400 J 2200
05/13/15 6900 3600 J 38000 14000 17000 4000 J 2200
11/10/15 5900 2400 J 25000 15000 18000 2500 J 2200
average = 5840.00 5966.67 3000.00 3000.00 11200.00 19526.67 2750.00 10342.86 157250.00 17200.00 -standard deviation = 780.60 929.16 707.11 707.11 -11419.12 353.55 2391.24 86654.88 836.66 -
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
FACILITY: ACTIVE C&D FACILITY
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM
QA/QCMW-110S
HISTORY OF CHEMICAL ANALYSIS
INORGANIC CONSTITUENTS: GENERAL CHEMISTRY
Constituent Sample Date LODMW-204SMW-110D MW-204D SWSLMW-5 MW-209 MW-210DMW-4 MW-201R MW-211RMW-210
sulfate 04/17/90
MCL =07/11/91
FBAC = 250000 (SWSL)05/28/92
NCGQS = 250000 (2L Std) 06/30/93
11/04/94
12/20/94
02/02/95
03/13/95
05/18/95
07/20/95
11/15/95
11/28/95
02/28/96
07/25/96
08/27/96
02/25/97
09/03/97
03/25/98
05/04/98
11/02/98
04/26/99
11/22/99
05/23/00
11/29/00
05/30/01
06/05/01
11/13/01
06/04/02
03/12/03
06/18/03
12/08/03
06/22/04
11/30/04
06/01/05
06/06/05
11/02/05
11/09/05
05/23/06
11/17/06
06/13/07 <5000 6300 J 9700 J 10300 J 11400 J 37000 J 453000 5000 250000
12/12/07 <5000 5750 J 6850 J 16200 J 11400 J 39800 J 147000 J 5000 250000
06/11/08 <10000 <10000 52600 J 13600 J <10000 50000 J 674000 10000 250000
11/06/08 <10000 <10000 <10000 21200 J 11600 J 11500 J 44600 J 54000 J 10000 250000
05/20/09 <78 2700 J 2600 J 5000 J 5500 J 11000 J 8900 J 41000 J 600000 78 250000
11/19/09 2000 J 2600 J 3200 JB 4900 JB 4800 JB 13000 J 8300 JB 42000 J 330000 78 250000 f
06/23/10 <120 2800 J 2500 J 4500 J 13000 J 13000 J 8500 J 46000 J 910000 120 250000
11/17/10 1900 J 2300 J 3200 J 4600 J 7800 J 23000 J 8200 J 44000 J 370000 120 250000
05/24/11 1900 J 2700 J 2800 J 4600 J 12000 J 12000 J 8300 J 39000 J 710000 20 250000
11/17/11 2000 J 4700 J 3300 J 10000 J 7700 J 40000 J 360000 20 250000
06/06/12 1900 J 3000 J 4600 J 11000 J 8400 J 39000 J 1100000 3700 J 40 250000
11/14/12 2000 J 3200 JB 13000 J 39000 J 640000 4000 JB 40 250000 i
05/13/13 2100 JB 3000 JB 9000 JB 41000 JB 40000 JB 3500 JB 40 250000 i
11/12/13 <2900 2900 J <2900 37000 J 16000 J 3600 J 2900 250000
05/13/14 <2900 <2900 16000 J 40000 J 17000 J 3300 J 2900 250000
11/11/14 <2900 3500 J 17000 J 40000 J 19000 J 3600 J 2900 250000
05/13/15 <2900 <2900 17000 J 41000 J 16000 J 3500 J 2900 250000
11/10/15 <2900 <2900 16000 J 38000 J 19000 J 4000 J 2900 250000
average = --------614700.00 --standard deviation = --------251246.69 --
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
FACILITY: ACTIVE C&D FACILITY
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM
QA/QCMW-110S
HISTORY OF CHEMICAL ANALYSIS
INORGANIC CONSTITUENTS: GENERAL CHEMISTRY
Constituent Sample Date LODMW-204SMW-110D MW-204D SWSLMW-5 MW-209 MW-210DMW-4 MW-201R MW-211RMW-210
total dissolved solids 04/17/90
MCL =07/11/91
FBAC = 05/28/92
NCGQS = 500000 (2L Std) 06/30/93
11/04/94
12/20/94
02/02/95
03/13/95
05/18/95
07/20/95
11/15/95
11/28/95
02/28/96
07/25/96
08/27/96
02/25/97
09/03/97
03/25/98
05/04/98
11/02/98
04/26/99
11/22/99
05/23/00
11/29/00
05/30/01
06/05/01
11/13/01
06/04/02
03/12/03
06/18/03
12/08/03
06/22/04
11/30/04
06/01/05
06/06/05
11/02/05
11/09/05
05/23/06
11/17/06
06/13/07 62000 83000 100000 131000 232000 132000 901000 5000
12/12/07 53000 98000 98000 295000 214000 153000 475000 5000
06/11/08 76000 129000 90000 110000 228000 228000 165000 1180000 5000
11/06/08 67000 B 73000 B 61000 B 73000 B 186000 B 187000 B 106000 B 911000 5000 f
05/20/09 60000 68000 84000 120000 100000 230000 200000 140000 1500000 10000
11/19/09 12000 B 14000 B <10000 66000 <10000 240000 170000 100000 840000 10000 f
06/23/10 76000 64000 74000 98000 250000 280000 210000 190000 2000000 10000
11/17/10 44000 160000 72000 86000 290000 240000 180000 160000 1600000 10000
05/24/11 <10000 44000 64000 120000 250000 310000 190000 140000 1700000 10000
11/17/11 44000 34000 38000 260000 240000 170000 1000000 10000
06/06/12 200000 52000 82000 410000 370000 390000 2900000 190000 10000
11/14/12 44000 50000 440000 250000 1800000 150000 10000
05/13/13 62000 92000 250000 160000 2000000 78000 10000
11/12/13 28000 50000 280000 200000 280000 34000 10000
05/13/14 42000 56000 420000 200000 250000 22000 10000
11/11/14 48000 62000 460000 190000 260000 30000 10000
05/13/15 <50000 52000 400000 190000 240000 <50000 50000
11/10/15 <50000 50000 380000 190000 270000 <50000 50000
average = 64538.46 93000.00 66437.50 91800.00 222500.00 309058.82 223400.00 183529.41 1446692.31 260000.00 84000.00standard deviation = 42974.05 49122.30 18779.31 25288.56 -92727.74 56301.17 63120.04 652393.34 15811.39 70552.11
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
FACILITY: ACTIVE C&D FACILITY
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM
QA/QCMW-110S
HISTORY OF CHEMICAL ANALYSIS
INORGANIC CONSTITUENTS: GENERAL CHEMISTRY
Constituent Sample Date LODMW-204SMW-110D MW-204D SWSLMW-5 MW-209 MW-210DMW-4 MW-201R MW-211RMW-210
All results in µg/L.
Shaded cells indicate data not available.
Upgradient wells shaded yellow.
Blue bolded values indicate concentrations that exceeded the FBAC.
Red bolded values indicate concentrations that exceeded the NCGQS.
Green bolded cells indicate concentrations that were >LOD but <SWSL,
or >LOD but <Method Reporting Limit, if no SWSL.
B - detect associated with blank contamination J - concentration is estimated
i - found in instrument blank t - found in trip blank
f - found in field blank ic - initial calibration beyond limits
cc - continuing calibration beyond limits d - duplicates beyond limits
ss - surrogate spikes beyond limits is - internal standard beyond limits
sd - serial dilution beyond limits ms - matrix spike beyond limits
ics - interference check sample beyond limits lcs – laboratory control sample beyond limits
q – reporting limit standard beyond limits msd - matrix spike duplicate beyond limits
FBAC – facility background NCGQS - Groundwater Standard, as established by the NCDENR
SWSL - solid waste section limit, as established by NCDENR SPL – statistical prediction limit
GWPS - ground water protection standard
R00592-162
INORGANIC CONSTITUENTS: GENERAL CHEMISTRY
CLIENT: THE COUNTY OF ORANGE
FACILITY: ORANGE COUNTY REGIONAL LANDFILL - NORTH FACILITY
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM
HISTORY OF CHEMICAL ANALYSIS

INDICATOR PARAMETERS

pH (standard units)06/23/10 6.03 NM 6.73 6.49 NM 6.29 7.51 6.33 6.1411/17/10 6.13 6.13 6.09 6.38 NM 6.13 6.2 6.13 6.08
05/24/11 5.85 5.83 6.21 NM 6.28 7.26 6.28 6.1311/15/11 5.58 5.79 6.18 6.46 7.27 6.13 5.92
06/06/12 5.18 5.68 6.16 6.32 7.3 6.39 6.12 5.18
11/14/12 5.42 5.81 6.25 6.18 6.37 6.07
05/13/13 5.28 5.28 5.80 6.23 6.10 5.86 4.87
11/12/13 5.26 5.20 5.78 6.39 6.53 7.23 5.58
05/13/14 4.51 5.73 6.01 6.09 6.54 7.10 5.29
11/11/14 5.60 5.68 6.04 6.02 6.37 7.04 5.21
05/13/15 5.73 5.48 5.92 6.19 6.64 7.24 5.21
11/10/15 5.72 7.90 8.38 6.28 6.50 7.21 5.06
average = 5.52 5.93 6.30 6.24 7.11 6.36 6.05 7.16 5.20standard deviation = 0.44 0.73 0.69 0.13 0.52 0.18 0.11 0.00 0.22
Temperature (degrees C)06/23/10 17.50 NM 15.90 16.40 NM 16.60 14.90 16.90 17.00
11/17/10 15.30 17.20 15.70 15.50 NM 15.90 15.00 16.90 16.30
05/24/11 16.10 15.60 16.30 NM 14.80 14.72 15.57 14.90
11/15/11 15.92 15.89 15.76 14.58 14.72 16.36 15.95
06/06/12 15.80 15.70 15.90 14.80 14.50 15.70 15.40 16.10
11/14/12 15.62 15.61 15.33 15.23 16.70 16.31
05/13/13 15.50 15.72 16.00 13.27 14.47 13.64 15.89
11/12/13 15.51 15.63 16.06 16.15 16.74 15.65 16.38
05/13/14 16.10 15.60 15.80 16.10 14.60 14.60 15.70
11/11/14 15.67 15.42 15.31 16.29 17.04 16.10 16.40
05/13/15 16.27 15.31 15.65 13.46 14.61 14.40 15.58
11/10/15 15.63 15.48 15.40 15.79 16.96 15.61 16.50
average = 15.91 15.63 15.78 15.25 14.77 16.05 15.64 15.27 16.08standard deviation = 0.58 0.17 0.36 1.09 0.19 1.01 1.11 0.73 0.37Specific Conductance (mS/cm)06/23/10 0.065 NM 0.075 0.120 NM 0.445 0.313 0.279 2.690
11/17/10 0.063 0.323 0.074 0.105 NM 0.362 0.300 0.258 1.354
05/24/11 0.070 0.080 0.121 NM 0.414 0.322 0.256 2.297
11/15/11 0.064 0.074 0.110 0.328 0.259 0.210 1.050
06/06/12 0.070 0.080 0.111 0.417 0.320 0.269 3.398 0.062
11/14/12 0.073 0.084 0.130 0.581 0.281 2.338
05/13/13 0.072 0.080 0.126 0.360 0.290 2.543 0.063
11/12/13 0.072 0.080 0.123 0.438 0.336 0.470 0.085
05/13/14 0.081 0.084 0.128 0.748 0.310 0.456 0.066
11/11/14 0.075 0.088 0.131 0.831 0.314 0.484 0.084
05/13/15 0.076 0.086 0.139 0.740 0.324 0.454 0.072
11/10/15 0.076 0.086 0.142 0.701 0.331 0.479 0.085
average = 0.071 0.081 0.124 0.530 0.303 0.288 2.239 0.469 0.074standard deviation = 0.005 0.005 0.011 0.179 0.026 0.037 0.801 0.013 0.011
Dissolved Oxygen (%)06/23/10 63.1 NM 33.8 18.5 NM 12.7 5.7 5.4 10.4
11/17/10 66.5 49.3 31.1 21.2 NM 19.6 6.1 4.7 20.3
05/24/11 103.0 24.8 13.4 NM 25.6 21.0 0.9 1.6
11/15/11 68.8 24.6 10.4 15.9 8.6 12.6 5.8
06/06/12 77.8 20.0 51.7 19.8 2.0 1.5 8.7 5.7
11/14/12 63.6 15.5 13.2 12.0 6.7 2.6
05/13/13 62.4 18.3 14.5 15.5 75.2 22.2 6.8
11/12/13 63.7 20.3 20.5 19.8 8.8 2.2 10.0
05/13/14 60.7 19.0 1.8 28.5 0.8 1.2 1.4
11/11/14 59.5 15.7 3.2 8.0 9.4 6.8 4.4
05/13/15 69.0 40.1 22.2 26.8 30.1 19.9 29.6
11/10/15 71.0 27.0 7.1 47.7 15.8 21.8 14.3
average = 69.09 24.18 16.48 20.99 8.68 14.32 10.23 10.38 10.31standard deviation = 11.83 7.65 12.99 10.46 7.28 20.83 8.16 9.81 9.45
Turbidity (NTUs)06/23/10 178 NM 18 33 NM 70 13.7 52 126
11/17/10 38 48 4 30 NM 189 5 21 740
05/24/11 39.7 5 91 NM 38 7 75 40
11/15/11 14.9 9.1 23.4 153 5.6 20.1 145
06/06/12 27.4 2.6 19 171 4.4 34.8 18.5 5.4
11/14/12 9.7 2.3 21 12.7 18.3 44
05/13/13 6.9 4.9 16.4 2.6 6.9 132.0 2.0
11/12/13 6.0 4.7 59.1 1.6 14.9 4.0 0.5
05/13/14 3.7 4.4 15.7 17.3 52.0 0.9 7.6
11/11/14 3.6 6.4 62.7 7.2 46.8 0.7 1.5
05/13/15 1.8 2.5 11.0 28.2 27.1 0.5 2.1
11/10/15 2.8 5.2 4.8 0 35.6 0.0 0
average = 27.71 5.76 32.26 57.55 7.14 33.71 177.93 1.22 2.73standard deviation = 49.25 4.28 25.61 71.53 3.79 19.66 253.05 1.59 2.76
ORP (meV)06/23/10 150.6 NM 69 72 NM 15.9 -88.7 -10.2 72
11/17/10 180 -61.9 91.6 110.7 NM 52.3 -72.1 48.9 138.6
05/24/11 129 102 80 NM 57 -63.8 12.2 125
11/15/11 141 111.3 87.4 89.1 52.2 89.7 101.5
06/06/12 324 187.5 127.9 36.5 -66.6 73.1 143.6 149.8
11/14/12 94 65.4 42.4 0.2 15.3 30.7
05/13/13 267 179.5 102.8 97.8 94.5 149 172.6
11/12/13 262 182.2 113.2 43.3 22.2 -80.8 119.1
05/13/14 174 116.2 83.1 52.0 41.0 -2.4 113.9
11/11/14 223 158.2 128.5 91.7 73.2 9.7 145.3
05/13/15 137 210.1 173.0 123.9 95.4 72.8 181
11/10/15 -18.2 -84.7 -136.7 -91.4 -151.6 -149.2 -162.1
average = 171.95 115.69 82.03 47.36 -47.80 33.64 108.63 -29.98 102.80standard deviation = 90.28 79.79 76.46 56.29 56.73 68.25 43.75 86.16 119.42
All values are last recorded immediately prior to sample collection.
Upgradient wells shaded yellow.
R00592-162
INDICATOR PARAMETERS
MW-201R MW-204S MW-204D MW-209 MW-210DMW-210
CLIENT: ORANGE COUNTY SOLID WASTE MANAGEMENT
FACILITY: ACTIVE C&D FACILITY
LOCATION: CHAPEL HILL, NORTH CAROLINA
PROJECT: GROUNDWATER MONITORING PROGRAM
HISTORY OF CHEMICAL ANMLYSIS
NM - Not Measured; well sampled with Hydrasleeve
MW-110DConstituentSample Date MW-4 MW-5 MW-110S MW-211R

ATTACHMENT 7

LABORATORY CERTIFICATES-OF-ANALYSIS

CHAINS-OF-CUSTODY

QUALITY CONTROL INFORMATION

ACTIVE C&D

NORTH AND ACTIVE C&D

SOUTH AND ACTIVE C&D

TRIP BLANK

ATTACHMENT 8

FIELD DATA
ATTACHMENT 8

FIELD DATA

Groundwater samples were obtained in accordance with the groundwater monitoring requirements
of the 15A North Carolina Administrative Code (NCAC) 13B and the Permit. Detailed sampling
procedures are documented on a series of groundwater sampling forms (presented at the end of this
ATTACHMENT).

1.1 Chronology

During November 10, November 11, and November 12, 2015 (sampling event 21), Sherrill
Environmental personnel obtained groundwater samples from seven groundwater monitoring wells
at the Orange County Solid Waste Management Active C&D Facility. During the subject
sampling event, the laboratory performed the following chemical analyses:
 samples obtained from four compliance wells (6804-MW204S, 6804-MW209, 6804-MW210D,
6804-MW211R) were analyzed for the constituents listed in Appendix I, one of the constituents
listed in Appendix II (mercury), and several parameters that are unique to C&D facilities
(manganese, iron, tetrahydrofuran, total dissolved solids, chloride, alkalinity, sulfate)
 samples obtained from well 6801-MW04 were analyzed for the constituents listed in 40 CFR
Part 258 Appendix I (15A NCAC 13B .1600), plus those constituents listed in Appendix II that
have been previously and reliably detected (mercury, naphthalene, sulfide) and for those
constituents required by regulations for monitoring of C&D landfills (manganese, iron,
chloride, sulfate, total dissolved solids, alkalinity) (well 6801-MW04 is associated with the
monitoring programs for both the active C&D landfill and North sanitary landfill)
 samples obtained from well 6801-MW110S were analyzed for the constituents listed in
Appendix I and for the constituents required by regulations for monitoring of C&D landfills
(manganese, iron, mercury, chloride, sulfate, tetrahydrofuran, total dissolved solids,
alkalinity) (well 6801-MW110S is associated with the monitoring programs for both the
active C&D landfill and South sanitary landfill)
 samples obtained from well 6801-MW110D were analyzed for total arsenic

Groundwater samples were delivered by hand to ENCO Laboratories, Inc. We have received
copies of the certificates-of-analysis (dated November 30, 2015).

1.2 Well Inspection

Prior to sampling groundwater, Sherrill personnel assessed the overall condition of each
groundwater monitoring well (including the surface completion). According to documentation
provided by Sherrill personnel, all wells were observed to be in generally good condition.

Field Data
Page 2

1.3 Static Water Levels

Using a graduated electronic water level indicator, field personnel measured static water levels in
each well prior to purging. All measurements were recorded to the nearest 0.01 foot (relative to the
top of the PVC well pipe).

A history of static water elevations is presented in ATTACHMENT 3.

1.4 Purging

All permitted wells were purged by Sherrill personnel using dedicated, submersible bladder
pumps with a compressor that was driven by a battery and associated control unit. Wells were
purged using a performance-based (“low-flow”) criteria presented in the document Guidelines
for Groundwater, Soil, and Surface Water Sampling (NCDENR - SWS; April, 2008). Field
purge and sample logs provided by Sherrill are presented at the end of this ATTACHMENT.

1.5 Groundwater Stability

The performance-based purging method essentially involves purging groundwater from a
monitoring well at a sufficient rate so as not to significantly disturb the water column. During
the purging process, several water quality parameters (pH, specific conductance, water
temperature, dissolved oxygen, turbidity, ORP) are periodically measured until successive
readings are generally consistent (within 10%). Additional purging criteria are presented in the
Guidelines document discussed above.

During the subject sampling event, the monitoring wells were purged until several consistent
field parameter readings were recorded. These parameters were measured in order to help ensure
that representative groundwater samples were obtained. Groundwater samples were obtained
immediately after the physical parameters had stabilized.

Stability is defined in the Groundwater Monitoring Plan as a deviation of less than 10% for two
consecutive readings. Readings recorded for each well are presented at the end of this
ATTACHMENT.

Note. When water levels are low in a well, or when the screened portion of the aquifer is
characterized by low hydraulic conductivity, the well may be purged to dryness. In such cases,
field personnel will allow time for groundwater levels to equilibrate, and restart the sampling
process from the point at which it was interrupted. If the well again purges to dryness, the
technician will obtain samples as the well recharges. In such cases, the groundwater samples are
deemed “representative” even if the usual stable readings cannot be obtained.
Field Data
Page 3

1.6 Well Sampling

Groundwater samples were obtained using the dedicated pumps immediately after pH, specific
conductance, and temperature had stabilized. The QA/QC analyses were performed on samples
obtained from 6801-MW4, 6801-MW110S, and 6804-MW204S.

1.7 Well Sampling Order

On November 10, 2015, wells were sampled in the following order: 6801-MW4, 6801-MW110S,
6801-MW110D (arsenic only)

On November 11, 2015, wells were sampled in the following order: 6804-MW209.

On November 12, 2015, wells were sampled in the following order: 6804-MW204S, 6804-
MW210D, 6804-MW211R.

1.8 Preservation

At the laboratory, all sample vessels were prepared with preservative by ENCO if required by the
method in SW-846.

1.9 Sample Transport

Immediately after the samples were obtained, they were placed beneath ice in insulated containers
for transportation to the laboratory.

Samples obtained on November 10, November 11, and November 12, 2015, were hand-delivered to
ENCO on November 11, November 12, and November 13, 2015.

Upon arrival at the laboratory, all temperatures inside of the insulated containers were measured and
found to lie within acceptable limits (< 4°C). All samples were placed in a refrigerator upon arrival
and held at approximately 4°C until the time at which they were analyzed.

Additional information concerning each monitoring well is presented at the end of this
ATTACHMENT.
Sherrill Environmental, Inc. GROUNDWATER SAMPLING FIELD DATA WORKSHEET Project Name: Orange Co. LF -C&D Permit No.: 68-04 Date: I IIIZL20I5 Time: ~(0 Client : Draper Aden · Weather: ~l) -=----WELL NUMBER: MW204S Well I.Diam: Measurements from TOC Screened interval: Personnel: J. Sherrill, LG ------Total well depth (TD): 23.01 Length of water column: I 3, ZB Total water volume purged: 2.. 1 5 Depth to water (DTW): q • 1" ?2 Volume in well (gal): -Z 1 1
Method Purged: Dedicated Bladder Pump
Method sampled: Dedicated Bladder Pump
Purge Time pH Temp Specific Dissolved ORP
Vol. (G) (C) Cond. (mS/cm) Oxygen(%) (mV) o.s 81~ ft,, 1-4 I t;~z_ O.--=lOLf 5~.lf -f DL2
l. '2... 82.D b,28 r~at; D, b tf Cf S, (. ') -7t:,,fo
1. . 0 82.5 [p,2':t l'S~ l (), 103 trs. to -=,a,.s
?_,l[ ?,sO 6,2.~ ,~.14 D. 10 I ~t,-:+ -q'. '1
Remarks on Sampling and Well Condition:
lop hAS °'-"' t?\1,-!Petk.1 covlJ b, r"pf~c.J 1 of) het?tJ.
Sample Collection Time: <o 5)
Turbidity
(NTU)
D.0
o.o
D.D
0.0
Sherrill Environmental, Inc. GROUNDWATER SAMPLING FIELD DATA WORKSHEET Project Name: Orange Co. LF -C&D Permit No.: 68-04 Date: 11/1( /2015 Time: f S 2.0 Client : Draper Aden Weather: _l:,_O' __ _ WELL NUMBER: MW209 Personnel: J. Sherrill, LG Well I.Diam: Measurements from TOC Screened interval: -----Total well depth (TD): 24.02 Depth to water (DTW): Lr {;;,'> Length of water column: -Z..l , 3 T Total water volume purged: 'SL D Volume in well (gal): 3,L(
Method Purged: Dedicated Bladder Pump
Method sampled: Dedicated Bladder Pump
Purge Time pH Temp Specific Dissolved ORP
Vol. (G) (C) Cond. (mS/cm) Oxygen(%) (mV)
LS \52.S '.Sfo (IP.Cf, D, 3"54 2-0~ G -( 23.'=, 2.-s 15.$0 fr,.f{) u;.q5 (). 33 2 8 rf5 -136~6
'-{,{) (535 {,,St:, 1 ID,1{;, 0, 332 ',lj -I 'fJ.3
lf .~ tS 'ID fn5D IG,,Cfl} 0. 33 3 t 'LS - \ '{8, Lf
5cO ISL/5 (p,.S D fl,,~ h '··D, 33 / f 5 r ~ --l ~,, ~
Remarks on Sampling and Well Condition:
Sample Collection Time: f S t{ 8
Turbidity
(NTU)
2/~-'.-=}-
?..I.'-/
"3't, 5
31.8
3'>ri
Sherrill Environmental, Inc. GROUNDWATER SAMPLING FIELD DATA WORKSHEET Project Name: Orange Co. LF -C&D Permit No.: 68-04 Client : Draper Aden WELL NUMBER: MW210D Well I.Diam: Measurements from TOC Date: 1 lll2L2015 Time: 2>q S: Weather: Sif ----Personnel: J. Sherrill, LG Screened interval: _____ _ Total well depth (TD): 23.8 Depth to water (DTW): 8, 93 Length of water column: I '1, 91 Volume in well (gal): _2._._'-1 __ Total water volume purged: 2-. , S
Method Purged: Dedicated Bladder Pump
Method sampled: Dedicated Bladder Pump
Purge Time pH Temp Specific Dissolved ORP Turbidity
Vol. (G) (C) Cond. (mS/cm) Oxygen(%) (mV) (NTU)
\, D s.so :t23 ,-,;, t; :J o.4,S 2.~. q -I L/'7. I 0 ,o
7.. rJ 8.sS :r. 23 ,~.bf D,418 2.3 I z. -IS"O. 0 o~o
z,t, 100 1,22 ,~,s, o, L.( =Jcr 2.2..' 2._ -/ '-19, b CJ.()
2,8 l)D7 1.21 \ S,bl /), '11-C, 2./. <a -('-l'f,2. o,D
Remarks on Sampling and Well Condition:
Sample Collection Time: Cf 04
~lO
Sherrill Environmental, Inc. GROUNDWATER SAMPLING FIELD DATA WORKSHEET Project Name: Orange Co. LF -C&D Permit No.: 68-04 Client : Draper Aden WELL NUMBER: MW211R Well I.Diam: Measurements from TOC Screened interval: ------Date: 11Ill/2015 Time: °lDB Weather: SO~ Personnel: J. Sherrill, LG Total well depth (TD): 45.80 Length of water column: 2. S , / 2 Total water volume purged: 3 r E> Depth to water (DTW): l f • 0 S Volume in well (gal): ~, S"
Method Purged: Dedicated Bladder Pump
Method sampled: __ D=ed=ic=a=te=d-=B=la=d=de=r-=-P-=um~p _______ _
Purge Time pH Temp Specific Dissolved ORP Turbidity
Vol. (G) (C) Cond. (mS/cm) Oxygen(%) (mV) (NTU)
I.? °IIS !;,l':1 \ (r, 34 DI O<o"6 I -=l . '.+ -lS'f .e, Oen
21S °tW s r\( I b.~ OtD 1~ t '-{ .Cf -(~5,b 0,6
3,S. °12.S r;,~ I h,'F! 0, l O :S 15 .. D -IUJrO 0-0
3J3 °l 2..=1-S,O& l lP ,SO (') cOB~ l '-t,3 -f b2, 1 o.o
Remarks on Sampling and Well Condition:
Sample Collection Time: 9 30
ATTACHMENT 9

STATISTICAL ANALYSES
ATTACHMENT 9

STATISTICAL ANALYSES

The regulations and the Groundwater Monitoring Plan indicate that (after background sampling
and analysis has been completed) each report shall also include:
 the arithmetic mean and variance of background data for each constituent
 the results of statistical analyses

Statistical analyses, as conducted to establish facility background concentrations, are documented in
a report previously submitted to the NCDENR - Solid Waste Section (issued April, 2006).

Previously-determined facility background values were replaced with their respective SWSL
values (unless the statistical prediction limit was larger).

Current facility background values (denoted as “FBAC”) are shown on a series of tables
summarizing the history of groundwater chemistry at the facility (ATTACHMENT 5 and
ATTACHMENT 6).

ATTACHMENT 10

QUALITY CONTROL ASSESSMENT

ATTACHMENT 10

QUALITY CONTROL INFORMATION

1.0 FIELD QUALITY ASSURANCE / QUALITY CONTROL

Rigorous sampling protocols were employed during groundwater sampling to help ensure that
each sample is representative of groundwater in the aquifer. Any non-dedicated equipment used
to purge and sample monitoring wells was decontaminated before and after sampling each well.

In addition, trip blanks were analyzed in order to help validate the observed concentrations of
specific constituents. The concentration of each constituent observed in groundwater was compared
to the concentration observed in each blank in accordance with the following rules:
 With regard to common organic laboratory contaminants (acetone, 2-butanone, methylene
chloride) and common phthalate contaminants, if the concentration in groundwater is less
than ten times (10x) the concentration in the blank, then we conclude that the constituent in
the groundwater sample may be attributed to cross-contamination.
 With regard to organic contaminants that are not commonly used in the laboratory and
inorganic contaminants in general, if the concentration in groundwater is less than five times
(5x) the concentration in the blank, then we conclude that the constituent in the groundwater
sample may be attributed to cross-contamination.

1.1 Deviations from the Plan

All sampling techniques met the specifications set forth in the Groundwater Monitoring Plan.

1.2 Trip Blanks

Trip blanks were prepared by the laboratory and transported by field personnel to each monitoring
well location. Trip blanks remained in the insulated container, and the lids of the containers were
never removed from the time the vehicle left the laboratory until the time field personnel delivered
the samples to the laboratory.

Trip blanks were analyzed for all constituents listed in 40 CFR Part 258 Appendix I (15A NCAC
13B .1600) that are typically analyzed using EPA Method 8260B.

No target analytes were detected within the trip blank.
Quality Control
Page 2

2.0 LABORATORY QUALITY ASSURANCE / QUALITY CONTROL

A limited QA/QC review was performed on the data provided by ENCO Laboratories. In general,
the Environmental Protection Agency's (EPA) Contract Laboratory Program (CLP) guidelines for
data validation in Region III were followed; however, SW-846 control limits (latest promulgated
edition) were used for QA/QC requirements.

Specifically, laboratory blanks were analyzed in order to help validate the observed
concentrations of specific constituents. The concentration of each constituent observed in
groundwater was compared to the concentration observed in each blank in accordance with the
following rules:

 With regard to common organic laboratory contaminants (acetone, 2-butanone,
methylene chloride) and common phthalate contaminants, if the concentration in
groundwater is less than ten times (10x) the concentration in the blank, then we conclude
that the constituent in the groundwater sample may be attributed to cross-contamination.

 With regard to organic contaminants that are not commonly used in the laboratory and
inorganic contaminants in general, if the concentration in groundwater is less than five
times (5x) the concentration in the blank, then we conclude that the constituent in the
groundwater sample may be attributed to cross-contamination.

2.1 EPA Method 8260B (volatile constituents)

As part of the QA/QC review, the following were examined:

 technical holding times and preservation requirements
 blank analysis
 transcription/confirmation errors

After reviewing the quality control data provided by ENCO Laboratories, the reviewer
determined that the dataset met all requirements of the criteria listed above, as specified by SW-
846 for the referenced method.

2.2 EPA Method 6010C (ICP - metals)

As part of the QA/QC review, the following were examined:

 technical holding times and preservation requirements
 blank analysis
 transcription/confirmation errors

Quality Control
Page 3

After reviewing the quality control data provided by ENCO Laboratories, the reviewer
determined that the dataset met all requirements of the criteria listed above, as specified by SW-
846 for the referenced method, except for the following:

The laboratory reported manganese in an associated instrument blank (>1.10 µg/l but
<10.0 µg/l) for well 6801-MW4. Since the reported concentration of manganese in
well 6801-MW4 (4.52 µg/l) is less than 5x the estimated concentration in the
associated blank (10.0 µg/l x 5 = 50 µg/l), the reported concentration in well 6801-
MW4 may be attributed to cross-contamination (flagged “B”).

2.3 EPA Method 6020A (ICP - metals)

As part of the QA/QC review, the following were examined:

 technical holding times and preservation requirements
 blank analysis
 transcription/confirmation errors

After reviewing the quality control data provided by ENCO Laboratories, the reviewer
determined that the dataset met all requirements of the criteria listed above, as specified by SW-
846 for the referenced method.

2.4 EPA Method 7470A (total mercury)

As part of the QA/QC review, the following were examined:

 technical holding times and preservation requirements
 blank analysis
 transcription/confirmation errors

After reviewing the quality control data provided by ENCO Laboratories, the reviewer
determined that the dataset met all requirements of the criteria listed above, as specified by SW-
846 for the referenced method.

2.5 EPA 300.0 (chloride, sulfate)

As part of the QA/QC review for these constituents, the following were examined:

 technical holding times and preservation requirements
 blank analysis
 transcription/confirmation errors
Quality Control
Page 4

After reviewing the quality control data provided by ENCO Laboratories, the reviewer
determined that the dataset met all requirements of the criteria listed above, as specified by SW-
846 for the referenced method.

[QUALITY CONTROL DOCUMENTATION, AS PROVIDED BY THE
LABORATORY, IS PRESENTED IN ATTACHMENT 7, ALONG WITH THE
ASSOCIATED CERTIFICATE-OF-ANALYSIS]

ATTACHMENT 11

CORRESPONDENCE