| Violation ID |
Occurrence Date |
Violation Type |
Violation Description(-) |
Violation Status |
Priority |
Source |
Facility Name |
Violated Reg. Meas. ID |
Violated Reg. Meas. Order No. |
Linked to Enf. |
| 1149064 |
10/10/2025 |
Order Conditions |
SOUTH COMPOST POND: On 10 October 2025 and 10 days after the end of the previous water year, Central Valley Water Board staff observed substantial amounts of stored water in the South Compost Pond, assumed to be contact stormwater. By observation, stored contact stormwater appeared to occupy approximately 50 percent of the capacity of the South Compost Pond. The observed condition threatens to cause contamination, pollution, or nuisance since, according to the water balance supporting the Water and Wastewater Management Plan(s), the South Compost Pond cannot contain noncontact stormwater resulting from the design storm event without overflow or overtopping and, thus, is in violation of the Compost General Order. Further, the South Compost Pond did not appear empty or near empty on 15 October 2025 as set forth in the Facility?s Water and Wastewater Management Plan(s), also in violation of the Compost General Order. |
Violation |
None |
Inspection |
Western Placer Waste Management Authority Materials Recovery Facility |
408196 |
2015-0121-DWQ |
N |
| 1149065 |
10/10/2025 |
Order Conditions |
NORTH COMPOST POND: On 10 October 2025 and 10 days after the end of the previous water year, Central Valley Water Board staff observed substantial amounts of stored water in the North Compost Pond, assumed to be contact stormwater. By observation, stored contact stormwater appeared to occupy approximately 50 percent of the capacity of the North Compost Pond. The condition threatens to cause contamination, pollution, or nuisance since, according to the water balance supporting the Water and Wastewater Management Plan(s), the North Compost Pond cannot contain noncontact stormwater resulting from the design storm event without overflow or overtopping, and, thus, is in violation of the Compost General Order. Further, the North Compost Pond did not appear empty or near empty on 15 October 2025 as set forth in the Facility?s Water and Wastewater Management Plan(s), also in violation of the Compost General Order. |
Violation |
None |
Inspection |
Western Placer Waste Management Authority Materials Recovery Facility |
408196 |
2015-0121-DWQ |
N |
| 1146428 |
05/16/2025 |
Enforcement Action |
Violation 1. The Discharger self-reported that on 16 May 2025, 500-gallons of landfill leachate was extracted from the ?drywell? in Module 12 and that this leachate was then discharged onto the landfill?s active face, for the purposes of dust control, in violation of the WDRs. This violates: 1. Prohibition A.5 of the WDRs sates: The discharge to landfill units of liquid or semi-solid waste (i.e., waste containing less than 50 percent solids), except dewatered sewage or water treatment sludge as provided in Section 20220(c) of Title 27, is prohibited. 2. Facility Specification C.5 of the WDRs states: Landfill leachate shall be conveyed to an offsite wastewater treatment plant for disposal. |
Violation |
None |
Report |
Western Regional Sanitary LF |
329292 |
R5-2007-0047 |
Y |
| 1143592 |
05/13/2025 |
Order Conditions |
A significant amount of windblown waste was observed along and just beyond the eastern downslope extent of FA2/Phase 6, outside the completed, lined extent of Fill Area 2. Violation 1. 1. Prohibition 4 of the WDRs states; The discharge of wastes outside of a Unit or portions of a Unit specifically designed for their containment is prohibited. 2. Prohibition 6 of the WDRs states; The discharge of solid or liquid waste or leachate to surface waters, surface water drainage courses, or groundwater is prohibited. |
Violation |
None |
Inspection |
Altamont/Resource Recovery Class II & III Landfills,Class II Surface Impoundment |
407660 |
R5-2016-0042 |
Y |
| 1142319 |
04/16/2025 |
Order Conditions |
1. The discharge of untreated compost leachate into an unlined pond. |
Violation |
None |
Inspection |
City of Modesto Co-Compost Project |
408069 |
2015-0121-DWQ |
Y |
| 1142322 |
04/16/2025 |
Order Conditions |
The southern portion of the active compost pad, which only contains a soil improved pad, with no asphalt, appeared to be in poor condition with notable undulations that could lead to ponding. |
Violation |
None |
Inspection |
City of Modesto Co-Compost Project |
408069 |
2015-0121-DWQ |
Y |
| 1142320 |
04/16/2025 |
Order Conditions |
2. Land application of partially treated compost leachate |
Violation |
None |
Inspection |
City of Modesto Co-Compost Project |
408069 |
2015-0121-DWQ |
Y |
| 1142321 |
04/16/2025 |
Order Conditions |
3. No visible composting pad was observed under the 10 acre Final Product Storge Area, and significant undulations and depressions, which could lead to extensive ponding, were observed. |
Violation |
None |
Inspection |
City of Modesto Co-Compost Project |
408069 |
2015-0121-DWQ |
Y |
| 1143238 |
03/11/2025 |
Order Conditions |
Discharge of hazardous waste into FA1, a Class III WMU, and FA2, a Class II WMU, in violation of Prohibition 2 of the WDRs. In a 22 April 2025 email, the Discharger notified Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff of the possible disposal of non-RCRA Hazardous Waste at the Facility. Within the 29 April 2025 PG&E Disposal Notification, the Discharger self-reported the acceptance and disposal of 16.62 tons of Hazardous Waste sludge into FA2. The Hazardous Waste originated from a Pacific Gas & Electric (PG&E) power pole replacement project occurring adjacent to the Potrero MGP Northern Switchyard in San Francisco, CA. Instead of placing onsite spoils in the bin provided for the project, the hydrovac contractor (Discovery Hydro) transported the wet spoils to the PG&E Oakport spoils yard and dumped approximately 200 gallons of untested wet spoils into a non-hazardous wet spoils bin on 11 March 2025. Once at the spoils yard, excess free liquid was decanted, and the remaining sludge was sent to the Altamont Landfill. Samples were collected from the PG&E project site, down to seven feet below ground surface on 10 April 2025, and the results confirmed elevated concentrations of chromium and nickel above established California (non-RCRA) Hazardous Waste levels. Due to the proximity of the sample location to the pole replacement location, and the lack of data associated with the original waste stream, PG&E and the Discharger presume that the disposed sludge is California (non-RCRA) Hazardous Waste. According to PG&E, these elevated detections are the result of naturally occurring serpentinite. The Total Threshold Limit Concentrations (TTLCs) detected for chromium and nickel were 805 mg/kg and 1,160 mg/kg, respectively, which are below RCRA Hazardous Waste levels. However, the Soluble Threshold Limit Concentrations (STLCs) detected for chromium and nickel were 12.5 mg/L and 83 mg/L, respectively, which exceed the California Hazardous Waste levels for these constituents. The California Hazardous Waste limits for chromium and nickel are 5 mg/L and 20 mg/L, respectively. Therefore, the subject PG&E waste the Discharger accepted and disposed in FA2 is a Hazardous Waste, and it must be removed, transported, and disposed of accordingly to return to compliance with the WDRs |
Violation |
None |
Report |
Altamont/Resource Recovery Class II & III Landfills,Class II Surface Impoundment |
407660 |
R5-2016-0042 |
Y |
| 1140550 |
02/18/2025 |
Order Conditions |
Violation 2 ? Ponding of compost leachate atop the western limit of the Southern Compost Pad was observed by Central Valley Water Board staff, as documented in Figures 21 through 24 of the attached 18 February 2025 Inspection Report. |
Violation |
N |
Inspection |
Western Placer Waste Management Authority Materials Recovery Facility |
408196 |
2015-0121-DWQ |
Y |
| 1140945 |
02/18/2025 |
Order Conditions |
Inadequate daily/intermediate cover and exposed waste |
Violation |
None |
Inspection |
Western Regional Sanitary LF |
329292 |
R5-2007-0047 |
Y |
| 1140553 |
02/18/2025 |
Order Conditions |
Violation 5 ? The discharge of compost leachate outside of the composting containment structure to a storm water drain was reported by the Discharger on 12 February 2025 and is documented in Figures 1, 2, and 3 of the attached 18 February 2025 Inspection Report. |
Violation |
None |
Inspection |
Western Placer Waste Management Authority Materials Recovery Facility |
408196 |
2015-0121-DWQ |
Y |
| 1140549 |
02/18/2025 |
Order Conditions |
Violation 1 ? Intentional blocking of leachate flow, ponding, and storage of leachate atop the Southern Compost Pond was observed by Central Valley Water Board staff, as documented in Figures 25, 26, and 27 of the attached 18 February 2025 Inspection Report. |
Violation |
None |
Inspection |
Western Placer Waste Management Authority Materials Recovery Facility |
408196 |
2015-0121-DWQ |
Y |
| 1140551 |
02/18/2025 |
Order Conditions |
Violation 3 ? Discharge of compost and compost leachate outside of the composting containment structure on an unpaved driveway was observed by Central Valley Water Board staff, as documented in Figure 33 of the attached 18 February 2025 Inspection Report. |
Violation |
None |
Inspection |
Western Placer Waste Management Authority Materials Recovery Facility |
408196 |
2015-0121-DWQ |
Y |
| 1140552 |
02/18/2025 |
Order Conditions |
Violation 4 ? Compost leachate impacts to the storm water drainage path that runs between the Receiving/Processing Pad and North Compost Pad was observed by Central Valley Water Board staff, as documented in Figures 38 through 46 of the attached 18 February 2025 Inspection Report. |
Violation |
None |
Inspection |
Western Placer Waste Management Authority Materials Recovery Facility |
408196 |
2015-0121-DWQ |
Y |
| 1140944 |
02/06/2025 |
Unauthorized Discharge |
6 February 2025 Module 14 leachate pipe break and discharge outside the WMU to a storm water drainage course. |
Violation |
None |
Report |
Western Regional Sanitary LF |
329292 |
R5-2007-0047 |
Y |
| 1140577 |
01/30/2025 |
Order Conditions |
1. Sumps 1, 6, and 9 no longer discharge to onsite storage tanks or to the Class II surface impoundment. The Discharger has rerouted these three sumps to discharge into areas that drain to storm water discharge locations. |
Violation |
None |
Inspection |
Thunderbolt Wood Treating Class II Surface Impoundment |
377017 |
R5-2010-0125 |
N |
| 1140019 |
01/30/2025 |
Order Conditions |
Violation 1. The concrete curb of the expanded CCA/ACZA diversionary structure has been intentionally cut so leachate can flow out of the diversionary structure and into Sump 5 in violation of: Discharge Specifications B.22, which states: The CCA/ACZA diversionary structure shall be inspected for cracks, leaks, or damage to the pavement surface or concrete curbs at least annually, and shall be maintained and repaired to prevent leakage. Design And Construction Specifications C.5, which states: The CAA/ACZA diversionary structure shall be paved with asphaltic concrete and have a 12 to 18 inch concrete curb or berm around it as described in the August 2010 ROWD and in Finding 22 of this Order. Provision F.9, which states: The Discharger shall immediately notify the Central Valley Water Board of any flooding, equipment failure, slope failure, or other change in site conditions which could impair the integrity of waste or leachate containment facilities or precipitation and drainage control structures. |
Violation |
None |
Inspection |
Thunderbolt Wood Treating Class II Surface Impoundment |
377017 |
R5-2010-0125 |
N |
| 1140020 |
01/30/2025 |
Order Conditions |
Sumps 1, 6, and 9 no longer discharge to onsite storage tanks or to the Class II surface impoundment. The Discharger has intentionally rerouted these three sumps to discharge into areas that drain to storm water discharge locations |
Violation |
None |
Inspection |
Thunderbolt Wood Treating Class II Surface Impoundment |
377017 |
R5-2010-0125 |
N |
| 1140943 |
01/29/2025 |
Unauthorized Discharge |
29 January 2025 Module 1 leachate pipe break and discharge outside the WMU to a storm water drainage course. |
Violation |
None |
Report |
Western Regional Sanitary LF |
329292 |
R5-2007-0047 |
Y |
| 1140942 |
12/15/2024 |
Unauthorized Discharge |
15 December 2024 Module 16 leachate pipe break and discharge outside the WMU to a storm water drainage course. |
Violation |
None |
Report |
Western Regional Sanitary LF |
329292 |
R5-2007-0047 |
Y |
| 1140941 |
12/14/2024 |
Unauthorized Discharge |
14 December 2024 Module 16 leachate seep and discharge outside the Waste Management Unit (WMU) to a storm water drainage course. |
Violation |
None |
Report |
Western Regional Sanitary LF |
329292 |
R5-2007-0047 |
Y |
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