Document 6bBpjQGD8bRRwKVMZVxb2xDj4
Region 2 Caribbean Environmental Protection Division Multimedia Permits and Compliance Branch Air Protection Team
CAA Inspection Report
Inspection Date: April 30, 2024
Facility Name:
Municipality of Arecibo Landfill
Facility Address:
PR-682 Interior, Bo. Factor, Garrochales Sector, Arecibo, Puerto Rico
EPA Lead Inspector: Alex Rivera, 787-977-5845, rivera.alex@epa.gov
EPA Asst. Inspector(s):Gloria Daz-Galarza, 787-977-5882, diaz-galarza.gloria@epa.gov Daniel Heins, 202-565-0070, heins.daniel@epa.gov Steven Rapp, 202-250-8961, rapp.steve@epa.gov Victor Tu, 212-637-3476, tu.victor@epa.gov Katherine Marmanides, 212-637-4063, marmanides.katherine@epa.gov Maria Malave, 202-564-7027, malave.maria@epa.gov
Facility Contact(s):
Cynthia B. Otero, Conwaste Environmental Compliance Division, (787) 366-6776, cotero@conwastepr.com; Hermes Camis, Facility Manager, (787) 354-8114, hcamis@conwastepr.com Jos Gonzlez, Operations Manager, 787-273-7639, jcgonzalez@conwastepr.com
This report is a summary of observations and information gathered from the facility at the time of the inspection. The information provided does not constitute a final decision on compliance with Clean Air Act ("CAA") regulations or applicable permits, nor is it meant to be a comprehensive summary of all activities and processes conducted at the facility.
Summary of Onsite Observations
A. Opening Conference
The representatives of the United States Environmental Protection Agency (USEPA), Alex Rivera, Gloria Diaz-Galarza, Victor Tu, Katherine Marmanides, Maria Malave, Steven Rapp, and Daniel Heins arrived at the Municipality of Arecibo Landfill ("MAL" or "facility") located in PR-682 Interior, Factor Ward, Garrochales Sector in Arecibo, PR. at approximately 10:40 am. The EPA representatives ("the inspectors") were met upon arrival by Mr. Jos Gonzlez, Operations Manager, showed credentials and explained the purpose of the inspection. Mr. Gonzlez contacted Mr. Hermes Camis, Facility Manager, via phone. Mr. Camis informed the inspectors that he was driving back to the facility, as he was at Conwaste's operated landfill located in
Page 1 of 5
Mayagez, PR. However. Mr. Camis agreed on addressing questions from the inspectors. The following is a summary of the conversation with Mr. Camis:
1. Daily cover material - Mr. Camis informed that two types of cover material are being used, including dirt that is acquired from a nearby quarry and Posi-Shell1. Mr. Camis added that approximately 1 foot of cover is applied.
2. Safety - Mr. Camis and Mr. Gonzlez both confirmed that they were not aware of any dangerous areas that could affect the SEM inspection, and informed that the only challenge would be related to slippery areas and forecast of rain throughout the day.
3. Active waste dump areas - Mr. Camis informed that the south portion of the landfill is being used as active waste dump area.
4. Areas where waste has been in place fewer than 5 years - Mr. Camis indicated that around all landfill there is a possibility that the facility gas collection and control system (GCCS) could be collecting gas from waste in place fewer than 5 years.
5. Type of landfill gas monitoring wells - Mr. Camis informed that the landfill has 85 landfill gas monitoring wells, all regulatory and vertical.
6. Type of waste - Mr. Camis indicated that the facility receives construction debris mixed with municipal solid waste.
7. GCCS status - Mr. Camis informed that the facility GCCS was in operation at the time of the inspection and that around 6 gas monitoring wells were disconnected to allow activities in the active dump area. Mr. Camis stated that these wells are located within the south facing area of the landfill and have been disconnected since the beginning of April.
8. SEM - Mr. Camis indicated that SEM is conducted in-house, and that the facility technician in charge of conducting SEM was going to be available for joining the inspectors around 12 PM. Mr. Camis confirmed that regularly no SEM exceedances are found and that a Landtec SEM 5000 instrument is used for conducting SEM.
B. Walkthrough/SEM
After completing the discussion, the inspectors agreed with Mr. Camis on providing a detailed summary of the SEM inspection observations during the inspection closing meeting. Mr. Carlos Fernndez, GCCS Operator and SEM technician agreed on assisting the inspectors during the monitoring. The SEM started around 11:40 AM. During the SEM, inspectors asked Mr. Fernndez questions about his monitoring practice. In response to these questions, he stated that he monitors penetrations by just placing the probe tip near the wellhead for twice the response time but does not check fully around each penetration point. When asked if he would check areas of exposed waste off of his monitoring path, he stated that he would not. He stated that he was performing his SEM in the manner in which he was trained. EPA inspectors provided feedback on compliant SEM practices. The inspectors concluded the SEM around 4:00 PM. See Appendix A (SEM Data), Appendix B (SEM Map), Appendix C (Photo Log), Appendix D (Instrument & Calibration Data) and closing meeting discussion summary for details about the SEM findings and observations.
1 https://www.lscenv.com/landfill-cover-systems-pg.html - Posi-Shell
Page 2 of 5
Closing Meeting
At approximately 4:15 PM, the inspectors returned to the facility office trailer for a closing conference with Mr. Camis. As agreed during the inspection opening meeting, the inspectors discussed with Mr. Camis the main findings and observations during the SEM. The following is a summary of the conversation:
1. Significant number of uncapped GCCS wellheads found. The inspectors noted that it appeared to be a consistent practice for fully offline wells to be directly venting to atmosphere.
2. Offline wells. The inspectors noted the wells that were fully offline, resulting in a lack of gas collection and elevated surface methane readings in areas subject to gas collection requirements.
3. Although the monitoring activity did not cover the entire extent of the facility SEM plan, the inspectors were able to find over 70 different locations with surface concentrations of methane over 500 ppm.
4. Significant leachate breakouts observed throughout the walkthrough. Mr. Camis was informed that although cover integrity issues were the common denominator for most of these breakouts, leachate breakouts could also be observed in areas without erosion issues too. The inspectors noted that the number of leachate breakthroughs could also indicate that numerous wells are watered-in and therefore not able to carry the quantity of gas as designed.
5. Significant vegetation growth at the edges of the landfill presents a challenge to properly conduct SEM.
6. Disparity between the inspectors SEM findings and what it is being reported in the facility SEM quarterly reports. The SEM reports EPA reviewed from 2021 and 2022 prior to inspection reported 0 exceedances in every quarter, and the opening conference confirmed that facility still does not find SEM exceedances.
7. Lack of knowledge about how to properly conduct SEM. In example, not monitoring the entire well circumference as required by EPA Method 212. The inspectors encouraged Mr. Camis to provide proper training or refreshers to Mr. Fernndez and more resources since Mr. Fernndez is the only technician conducting SEM and also operating the GCCS.
8. Exposed waste, lack of adequate cover issues observed throughout the walkthrough. Mr. Camis indicated that the facility is planning to use hydroseeding at several areas to improve the cover issues.
9. Cover integrity issues generating avenues for gases to migrate through the landfill surface into the atmosphere.
10. Wells venting to the atmosphere - The inspectors provided examples such as wellhead #20, that according to Mr. Fernndez it was allegedly broken by a cow that got access to the landfill, the wellhead was venting to the atmosphere with methane concentrations at the top of over 300,000 ppm and 30,000 ppm from its base. The inspectors also mentioned several wellheads that were found under positive pressure. Mr. Camis
2 https://www.epa.gov/sites/default/files/2017-08/documents/method_21.pdf
Page 3 of 5
acknowledge that they have a few wellheads experiencing positive pressure and explained that some wellheads were showing an increment in oxygen concentrations, and they restricted its flow to mitigate the issue. The inspectors indicated to Mr. Camis that such condition could be a result of having vacuum leaks, which was also part of the issues observed at some wellheads, and that such condition will indeed allow oxygen levels to be increased. The inspectors recommended that rather than restricting the wellhead flow, the facility can try to find and resolve the vacuum leaks and that as found during the SEM, some of these vacuum leaks can be easily heard. 11. The inspectors asked Mr. Camis about the gas volume that is being processed at the facility flares. Mr. Camis indicated that they are currently managing around 310 scfm. The inspectors told Mr. Camis that such amount is low for the landfill size, but consistent with the number of methane found migrating through the landfill surface. 12. The inspectors informed Mr. Camis that the SEM data along with other supplement documentation such as maps will be shared via email with him and Ms. Cynthia Otero as soon as possible3. The inspectors also informed Mr. Camis that corrective actions should be coordinated as soon as the SEM data becomes available to the facility4. Also Mr. Camis was informed that the SEM findings along with the respective corrective actions should be included in the corresponding SEM quarterly report. 13. The inspectors also informed Mr. Camis that an inspection report will be prepared and shared with him and Ms. Cynthia Otero within approximately 60 days. The inspectors expressed gratitude for all the assistance provided during the inspection and all the cooperation to provide the information needed to complete the inspection. The inspectors concluded the inspection at 5:00 PM.
Appendices
Appendix A - SEM Data Appendix B - SEM Map Appendix C - Photo Log Appendix D - Instrument & Calibration Data
3 On May 2, 2024, EPA's Daniel Heins sent the SEM documentation to Conwaste's Hermes Camis and Cynthia Otero via email. 4On May 1, 2024, Conwaste's Hermes Camis sent to EPA's Alex Rivera an email containing a series of pictures documenting a series of corrective actions to resolve or mitigate some of the issues found during EPA's SEM inspection.
Page 4 of 5
End of Report
Lead Inspector's Name: Alex Rivera
ALEX RIVERA
Digitally signed by ALEX RIVERA Date: 2024.06.03 14:59:14 -04'00'
Supervisor's Name: Nancy Rodrguez
NANCY
Digitally signed by NANCY RODRIGUEZ
RODRIGUEZ
Date: 2024.06.03 17:09:32 -04'00'
Page 5 of 5
Appendix A: SEM Data
SEM Exceedances
ID
Description
A1
Pipe horizontal
A2
Pipe horizontal
A3
Well 33
A4
Well 34
A5
Well 35
A6
Exposed waste
A7
well
A8
Exposed waste/rill
A9
Well 38
A10 Exposed waste
A11 Exposed waste
A12 Well with #79160
A13 Well with #73039
A14 Exposed waste/erosion
A15 Pipe sticking out
A16 Well 41
A17 Well 42
A18 Well 43
A19 Well 30
A20 Erosion
A21 Well 44
A22 Well 13
A23 Well 14
A24 Well 15
A25 Well 16
A26 Well with #79170
A27 Well 18
A28 Well 64
A29 Well 19 + waste
Time 12:00 12:04 12:09 12:12 12:15 12:19 12:25 12:31 12:34 12:36 12:39 12:43 12:47 12:57 13:01 13:03 13:07 13:10 13:12 13:15 13:18 13:24 13:26 13:28 13:31 13:37 13:42 13:45 13:51
A30 Well 20 (base and venting at top) 13:53
A31 Well 21
13:59
A32 Well 22
14:03
A33 Well 23
14:05
A34 Well 24
14:07
A35 Well 25
14:09
Well with #79033, out sampling
A36 port and base
14:11
A37 Exposed waste and erosion
14:15
Unknown well - coming out top and
A38 base
14:16
Reading ppm 6449 7500 1175 107223 818 1033 25164 690 72977 520 761 3502 1117 1609 20282 4899 1115 3373 43195 2718 12075 2941 1367 1830 977 8946 1155 1009 10895 311877 at top; 3000 at base 1037 4274 1140 10052 8305 200000 at top; 2099 at base 810 240000 at top; 46515 at base
Latitude 18.46638 18.46629 18.46647 18.46654 18.46670 18.46650 18.46664 18.46644 18.46641 18.46639 18.46641 18.46650 18.46647 18.46669 18.46642 18.46654 18.46649 18.46646 18.46676 18.46668 18.46639 18.46666 18.46673 18.46648 18.46614 18.46589 18.46536 18.46546 18.46485
Longitude -66.62420 -66.62372 -66.62380 -66.62350 -66.62308 -66.62275 -66.62199 -66.62148 -66.62139 -66.62119 -66.62116 -66.62080 -66.62035 -66.62017 -66.62002 -66.61971 -66.61914 -66.61854 -66.61872 -66.61869 -66.61799 -66.61748 -66.61702 -66.61701 -66.61709 -66.61770 -66.61784 -66.61802 -66.61805
18.46455 18.46421 18.46385 18.46371 18.46378 18.46395
-66.61824 -66.61871 -66.61931 -66.61968 -66.62009 -66.62064
18.46410 18.46408
-66.62069 -66.62045
18.46400 -66.62017
A39 A40 A41 A42 A43 A44 A45 A46 A47 A48 A49 A50
A51
A52
A53 A54 A55 B1 B2 B3
B4/B5
Well and exposed waste Leaks on sides drain Capped PVC pipe (offline well 77) Well 70 Tire (exposed waste) Unknown well Well 53 Unknown well Well 61 Exposed waste (cushion) Well 60 Well with #78187 Venting uncapped disconnected well (exceedance at base and top) Venting uncapped disconnected well (exceedance at base and top) Venting uncapped disconnected well Unknown well Exposed waste Well 72 Leachate breakout near well 72 Uncovered pipe Well 78, also open vent out of monitoring reach and pipe not attached to cap
B6/B7
B8/B9 B10 B11
Well 85 at well and uncapped pipe Well 72 head disconnected from header - hole of wellhead Well 63 Well 54 - extended with no cap
B12/13 B14 B15 B16 B17 B18 B19 B20 B21 B22
B23
Well 52 base + connector leak Well 51 Well 50 Well 49 Well 48 Open wellhead Wellhead Wellhead Header exiting landfill Dirt under header pipe Valve and header coming out of ground
14:22 14:23 14:29 14:32 14:33 14:39 14:42 14:49 14:51 14:52 14:55 14:57
15:03
15:05
15:18 15:21 15:26 13:52 13:55 14:00
14:11
14:20
14:33 14:38 14:41
14:46 14:50 14:52 14:55 14:59 15:18 15:22 15:24 15:27 15:29
15:34
11825 3477 3300 2035 780 4878 9492 58983 8616 735 12434 62465 205000 at top; 86705 at base 150000 at top; 7479 at base
18.46399 18.46409 18.46441 18.46494 18.46495 18.46549 18.46596 18.46504 18.46552 18.46557 18.46561 18.46563
-66.61958 -66.61959 -66.61959 -66.61934 -66.61924 -66.61905 -66.61880 -66.61987 -66.62022 -66.62048 -66.62077 -66.62131
18.46613 -66.62217
18.46567 -66.62188
205864 at top 41781 2067 4691 621 5863 5736 at wellhead; 1634 at pipe 73025 at pipe; 38000 at base 6294 wellhead; 2612 at hole 6920 85540 7843 at base; 956 at connector leak 4731 27687 1807 4042 52022 4712 24628 3554 3369
18.46622 18.46613 18.46633 18.46503 18.46502 18.46455
18.46453
18.46420
18.46491 18.46545 18.46589
18.46602 18.46606 18.46601 18.46604 18.46609 18.46576 18.46552 18.46571 18.46600 18.46621
-66.62274 -66.62310 -66.62365 -66.61830 -66.61837 -66.61863
-66.61903
-66.61909
-66.61877 -66.61850 -66.61825
-66.61933 -66.61999 -66.62051 -66.62102 -66.62162 -66.62249 -66.62271 -66.62288 -66.62328 -66.62352
507
18.46638 -66.62413
Exceedances in the A survey were detected using the AED IRwin by Daniel Heins. Exceedances in the B survey were detected using the R2 IRwin by Victor Tu and Katherine Marmanides.
Probe tips were fixed on hiking poles 8 cm from the base of the pole, all readings taken from 8 to 10 cm from the ground with the exception of secondary readings noted from venting collection infrastructure. A53 is the only reading not associated with a confirmed surface exceedance.
Note: Some co-located exceedances were condensed into single points for the above table and the below map.
Background readings: Upwind: 0 ppm Downwind: 2 ppm
74 exceedances total:
500 - 1,000 ppm: 10 1,000 - 5,000: 29 5,000 - 10,000: 11 10,000 - 50,000: 11 50,000 - 100,000: 6 > 100,000: 7
Appendix B: SEM Map
Blue and red lines trace each team's monitoring path. Exceedances are plotted and labeled as described in Appendix A. The survey covered less 32 acres of the landfill.
Appendix C: Photo Log for Municipality of Arecibo Landfill, Arecibo, PR
Facility Address: PR-682 Interior, Bo. Factor, Garrochales Sector, Arecibo, Puerto Rico
EPA Inspectors: Alex Rivera, Gloria Diaz-Galarza, Daniel Heins, Steven Rapp, Maria Malave, Katherine Marmanides, and Victor Tu
Image numbers: P4300046 through P4300123 Camera Used: Olympus TG-6 Digital Camera (EPA Decal # S63861)
Image Number 1
File Name P4300046.JPG
Description
Date Taken 4/30/2024
Time taken 1121
Wide shot of the landfill from parking lot. Note: Time stamp reflect Pacific Time
2
P4300047.JPG
4/30/2024 1124
Appendix C Municipality of Arecibo Landfill Inspection Report
1
3
P4300048.JPG
4/30/2024 1135
Enclosed flare stack (right)
4
P4300049.JPG
4/30/2024 1135
Enclosed flare stack (left)
Appendix C Municipality of Arecibo Landfill Inspection Report
2
5
P4300050.JPG
4/30/2024 1136
GCCS system scrubber
6
P4300051.JPG
4/30/2024 1150
GCCS condensate tank
Appendix C Municipality of Arecibo Landfill Inspection Report
3
7
P4300052.JPG
4/30/2024 1202
Horizontal pipe penetrating ground
8
P4300053.JPG
4/30/2024 1205
Horizontal pipe penetrating ground
Appendix C Municipality of Arecibo Landfill Inspection Report
4
9
P4300054.JPG
4/30/2024 1207
Exposed waste
10
P4300055.JPG
4/30/2024 1208
Landfill gas monitoring well #33
Appendix C Municipality of Arecibo Landfill Inspection Report
5
11
P4300056.JPG
4/30/2024 1213
Landfill gas monitoring well #34
12
P4300057.JPG
4/30/2024 1214
Woody shrub
Appendix C Municipality of Arecibo Landfill Inspection Report
6
13
P4300058.JPG
4/30/2024 1216
Landfill gas monitoring well #35
14
P4300059.JPG
4/30/2024 1219
Exposed waste
Appendix C Municipality of Arecibo Landfill Inspection Report
7
15
P4300060.JPG
4/30/2024 1224
Exposed waste
16
P4300061.JPG
4/30/2024 1226
Unidentified landfill gas monitoring well
Appendix C Municipality of Arecibo Landfill Inspection Report
8
17
P4300062.JPG
4/30/2024 1231
Erosion rill
18
P4300063.JPG
4/30/2024 1235
Landfill gas monitoring well #79
Appendix C Municipality of Arecibo Landfill Inspection Report
9
19
P4300064.JPG
4/30/2024 1237
Exposed waste
20
P4300065.JPG
4/30/2024 1240
Exposed waste
Appendix C Municipality of Arecibo Landfill Inspection Report
10
21
P4300066.JPG
4/30/2024 1241
Vegetation at bottom of the slope near adjacent waterbody
22
P4300067.JPG
4/30/2024 1243
Landfill gas monitoring well #38 (tag # 79179)
Appendix C Municipality of Arecibo Landfill Inspection Report
11
23
P4300068.JPG
4/30/2024 1245
EPA inspector conducting SEM in vegetated area near adjacent waterbody
24
P4300069.JPG
4/30/2024 1247
Landfill gas monitoring well (tag # 73039)
Appendix C Municipality of Arecibo Landfill Inspection Report
12
25
P4300070.JPG
4/30/2024 1256
EPA inspector next to a fully grown papaya tree
26
P4300071.JPG
4/30/2024 1258
Erosion exposed waste and vegetation
Appendix C Municipality of Arecibo Landfill Inspection Report
13
27
P4300072.JPG
4/30/2024 1302
Pipe sticking out of ground
28
P4300073.JPG
4/30/2024 1304
Landfill gas monitoring well #41
Appendix C Municipality of Arecibo Landfill Inspection Report
14
29
P4300074.JPG
4/30/2024 1306
Leachate seep on hill of landfill
30
P4300075.JPG
4/30/2024 1306
Leachate discoloration
Appendix C Municipality of Arecibo Landfill Inspection Report
15
31
P4300076.JPG
Landfill gas monitoring well #42
32
P4300077.JPG
4/30/2024 1308 4/30/2024 1311
Landfill gas monitoring well #43
Appendix C Municipality of Arecibo Landfill Inspection Report
16
33
P4300078.JPG
Landfill gas monitoring well #30
34
P4300079.JPG
4/30/2024 1313 4/30/2024 1316
Erosion exposed waste and vegetation
Appendix C Municipality of Arecibo Landfill Inspection Report
17
35
P4300080.JPG
4/30/2024 1318
Leachate breakout and open pipe
36
P4300081.JPG
4/30/2024 1320
Landfill gas monitoring well #44
Appendix C Municipality of Arecibo Landfill Inspection Report
18
37
P4300082.JPG
4/30/2024 1325
Landfill gas monitoring well #13 surrounded by thick vegetation of >4 feet.
38
P4300083.JPG
4/30/2024 1327
Landfill gas monitoring well #14 surrounded by vegetation
Appendix C Municipality of Arecibo Landfill Inspection Report
19
39
P4300084.JPG
4/30/2024 1329
Landfill gas monitoring well #15
40
P4300085.JPG
4/30/2024 1331
Landfill gas monitoring well #16
Appendix C Municipality of Arecibo Landfill Inspection Report
20
41
P4300086.JPG
4/30/2024 1336
Landfill gas monitoring well (tag #79170)
42
P4300087.JPG
4/30/2024 1343
Landfill gas monitoring well #18
Appendix C Municipality of Arecibo Landfill Inspection Report
21
43
P4300088.JPG
4/30/2024 1344
Exposed waste
44
P4300089.JPG
4/30/2024 1346
Landfill gas monitoring well #64
Appendix C Municipality of Arecibo Landfill Inspection Report
22
45
P4300090.JPG
4/30/2024 1351
Landfill gas monitoring well #19
46
P4300091.JPG
4/30/2024 1354
Landfill gas monitoring well #20. Methane leak of >300,000 ppm at the top because top was missing. Exposed waste and 3,000 ppm methane concentration at its base.
Appendix C Municipality of Arecibo Landfill Inspection Report
23
47
P4300092.JPG
Landfill gas monitoring well #21
48
P4300093.JPG
4/30/2024 1400 4/30/2024 1404
Landfill gas monitoring well #22
Appendix C Municipality of Arecibo Landfill Inspection Report
24
49
P4300094.JPG
4/30/2024 1406
Landfill gas monitoring well #23
50
P4300095.JPG
4/30/2024 1408
Landfill gas monitoring well #24
Appendix C Municipality of Arecibo Landfill Inspection Report
25
51
P4300096.JPG
4/30/2024 1410
Landfill gas monitoring well #25
52
P4300097.JPG
4/30/2024 1411
Landfill gas monitoring well (tag #79033) venting through sampling port and base
Appendix C Municipality of Arecibo Landfill Inspection Report
26
53
P4300098.JPG
4/30/2024 1415
Exposed waste and erosion
54
P4300099.JPG
4/30/2024 1417
Unidentified landfill gas monitoring well venting through top and base
Appendix C Municipality of Arecibo Landfill Inspection Report
27
55
P4300100.JPG
4/30/2024 1420
Exposed waste and rill
56
P4300101.JPG
4/30/2024 1420
Exposed waste and rill
Appendix C Municipality of Arecibo Landfill Inspection Report
28
57
P4300102.JPG
4/30/2024 1423
Unidentified landfill gas monitoring well and exposed well
58
P4300103.JPG
4/30/2024 1424
Leaks found on side of drainage pipe
Appendix C Municipality of Arecibo Landfill Inspection Report
29
59
P4300104.JPG
4/30/2024 1430
Capped PVC pipe, offline landfill gas monitoring well #77
60
P4300105.JPG
4/30/2024 1433
Landfill gas monitoring well #70
Appendix C Municipality of Arecibo Landfill Inspection Report
30
61
P4300106.JPG
4/30/2024 1434
Exposed waste
62
P4300107.JPG
4/30/2024 1440
Unidentified landfill gas monitoring well
Appendix C Municipality of Arecibo Landfill Inspection Report
31
63
P4300108.JPG
4/30/2024 1443
Landfill gas monitoring well #53
64
P4300109.JPG
4/30/2024 1450
Unidentified landfill gas monitoring well
Appendix C Municipality of Arecibo Landfill Inspection Report
32
65
P4300110.JPG
4/30/2024 1452
Landfill gas monitoring well #61
66
P4300111.JPG
4/30/2024 1454
Exposed waste
Appendix C Municipality of Arecibo Landfill Inspection Report
33
67
P4300112.JPG
4/30/2024 1455
Landfill gas monitoring well #60
68
P4300113.JPG
4/30/2024 1458
Landfill gas monitoring well (tag # 78187)
Appendix C Municipality of Arecibo Landfill Inspection Report
34
69
P4300114.JPG
4/30/2024 1504
Venting uncapped and disconnected landfill gas monitoring well (exceedance at base and
top)
70
P4300115.JPG
4/30/2024 1506
Venting uncapped and disconnected landfill gas monitoring well (exceedance at base and top)
Appendix C Municipality of Arecibo Landfill Inspection Report
35
71
P4300116.JPG
4/30/2024 1507
Venting uncapped and disconnected landfill gas monitoring well (exceedance at base and
top)
72
P4300117.JPG
4/30/2024 1507
Venting uncapped and disconnected landfill gas monitoring well (exceedance at base and top), showing condensation and bubbles at edge of opening
Appendix C Municipality of Arecibo Landfill Inspection Report
36
73
P4300118.JPG
4/30/2024 1508
Venting uncapped and disconnected landfill gas monitoring well (exceedance at base and
top)
74
P4300119.JPG
4/30/2024 1519
Venting uncapped landfill gas monitoring well
Appendix C Municipality of Arecibo Landfill Inspection Report
37
75
P4300120.JPG
4/30/2024 1519
Venting uncapped landfill gas monitoring well with white goods pile in background (right
side)
76
P4300121.JPG
4/30/2024 1522
Unidentified landfill gas monitoring well
Appendix C Municipality of Arecibo Landfill Inspection Report
38
77
P4300122.JPG
4/30/2024 1527
Exposed waste
78
P4300123.JPG
4/30/2024 1527
South facing portion of the landfill and white good pile in background (upper right side)
Appendix C Municipality of Arecibo Landfill Inspection Report
39
Appendix D: Instrument and Calibration Data
The survey was conducted using two (2) Inficon IRwin devices using the Elkins Earthworks software. They are referred to throughout this report as the "AED IRwin" and the "R2 IRwin"
Instrument Information Instrument Type
AED IRwin Inficon IRwin R2 IRwin Inficon IRwin
Formal Identifier SX # 580-01092006439 SX # 580-01092005497
Calibration, Response Time and Precision Checks
R2 IRwin
Trial
Calibration Gas ppm Reading (ppm)
1
500
500
2
500
500
3
500
490
Time (s) 5 5 4
AED IRwin Reading (ppm) 500 500 500
Time (s) 5 4 5
Both instruments were calibrated and checked for response time and precision on April 30, 2024 at 10am using zero air and 500 ppm methane. All readings are within 10% of the known calibration value. Response times are approximately 4-5 seconds, under the maximum of 30 seconds.
This also served as the initial calibration pre-inspection bump check, showing successful calibration.
Post Survey Calibration Checks
Date/Time
Gas Concentration (ppm)
2024-04-30 15:55 500
R2 IRwin Reading (ppm) 400
AED IRwin Reading (ppm) 490
Post-survey bump check show maintenance of calibration for the AED IRwin and downward drift for the R2 IRwin, possibly resulting in false negatives (ie, missed exceedances) and potential underestimation of the severity of measured exceedances.
Calibration Gas Composition Zero air <1 ppm total hydrocarbon 500 ppm methane in air
Manufacturer Airgas Airgas
Lot Number 304-402941563-1 304-402960982-1
Expiration Date 2/23/2028 2/2/2028
