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Place ID 863643 		  
  
  
  
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General Information
Region Place ID Place Name Place Type Place Address Place County
2 863643 Stevens Creek Quarry Sand and Gravel Mining 12100 Stevens Canyon Cupertino, CA, 95014 Santa Clara
Expand/Contract Related Parties
Related Parties
Party Party Type Party Name Role Classification Relationship Start Date Relationship End Date
629636 Person Ryan Charney Pending-is a data submitter for 12/08/2021
629196 Person Lisa Welsh Is A Data Submitter For 11/19/2021
627845 Person Neftali Eunice Romero Is A Data Submitter For 09/27/2021
624263 Person Jason Voss Is Onsite Manager For 09/01/2021
364108 Person Adrienne V. Miller Is A Data Submitter For 08/26/2021
627172 Person Julio Cazares Is A Data Submitter For 08/26/2021
364108 Person Adrienne V. Miller Contact 06/21/2021
624262 Organization Stevens Creek Quarry, Inc. Owner and Operator Privately-Owned Business 05/12/2021
624263 Person Jason Voss Contact 05/12/2021
Total Related Parties: 9
Expand/Contract Regulatory Measures
Regulatory Measures
Reg Measure ID Reg Measure Type Region Program Order No. WDID Effective Date Expiration Date Status Amended?
443276 NPDES Permit 2 NPDMINING R2-2021-0010 2 43I006687 07/01/2021 06/30/2026 Active N
Total Reg Measures: 1
Expand/Contract Violations
Violations
Violation ID Occurred Date Violation Type (-) Violation Description Corrective Action Status Classification Source
1125370 02/01/2024 CAT2 Chromium (VI) Monthly Average limit is 5.6 ug/L and reported value was 9.8 ug/L at EFF-004. Stevens Creek Quarry (SCQ) will conduct internal monitoring of the Active Treatment System (ATS) to evaluate the source of the exceedance and the performance of the ATS. Based on the ATS evaluation, SCQ will implement needed repairs as they arise and continue to conduct routine sediment removal of the settling tanks to optimize performance. SCQ will retrain sampling staff on proper sampling techniques. Violation U eSMR
1125371 02/01/2024 Surface Water Exceedance of R2-2021-0010, Section V. Turbidity, Instantaneous Maximum limit is 55 NTU and reported value was 57.18 NTU. Stevens Creek Quarry (SCQ) will conduct internal monitoring of the Site to evaluate the source of the exceedance. Based on the Site evaluation, SCQ will implement needed repairs as they arise and continue to conduct routine sediment removal of the settling tanks to optimize BMP performance. Violation U eSMR
1124649 01/22/2024 CAT2 Chromium (VI) Monthly Average limit is 5.6 ug/L and reported value was 9.8 ug/L at EFF-004. Stevens Creek Quarry (SCQ) will conduct internal monitoring of the Active Treatment System (ATS) to evaluate the source of the exceedance and the performance of the ATS. Based on the ATS evaluation, SCQ will implement needed repairs as they arise and continue to conduct routine sediment removal of the settling tanks to optimize performance. SCQ will retrain sampling staff on proper sampling techniques. Violation U eSMR
1124651 01/22/2024 Surface Water Exceedance of R2-2021-0010, Section V. Turbidity, Instantaneous Maximum limit is 55 NTU and reported value was 143.37 NTU. Stevens Creek Quarry (SCQ) will conduct internal monitoring of the Site to evaluate the source of the exceedance. Based on the Site evaluation, SCQ will implement needed repairs as they arise and continue to conduct routine sediment removal of the settling tanks to optimize BMP performance. Violation U eSMR
1124650 01/22/2024 Surface Water Exceedance of R2-2021-0010, Section V. Turbidity, Instantaneous Maximum limit is 90.9 NTU (10% increase from 82.65 NTU background level) and reported value was 205.12 NTU. Stevens Creek Quarry (SCQ) will conduct internal monitoring of the Site to evaluate the source of the exceedance. Based on the Site evaluation, SCQ will implement needed repairs as they arise and continue to conduct routine sediment removal of the settling tanks to optimize BMP performance. Violation U eSMR
1123377 12/31/2023 CAT2 Chromium (VI) Monthly Average limit is 5.6 ug/L and reported value was 7.3 ug/L at EFF-004. Stevens Creek Quarry (SCQ) will conduct internal monitoring of the Active Treatment System (ATS) to evaluate the source of the exceedance and the performance of the ATS. Based on the ATS evaluation, SCQ will implement needed repairs as they arise and continue to conduct routine sediment removal of the settling tanks to optimize performance. SCQ will retrain sampling staff on proper sampling techniques. Violation B eSMR
1123376 12/18/2023 DMON Exceedance of R2-2021-0010, Section V. SCQ did not sample for Dissolved Oxygen in milligrams per liter (mg/L). SCQ will retrain sampling staff on proper sampling techniques. Violation B eSMR
1123379 12/18/2023 DMON Exceedance of R2-2021-0010, Section V. SCQ did not sample for Dissolved Oxygen in milligrams per liter (mg/L). SCQ will retrain sampling staff on proper sampling techniques. Violation B eSMR
1123380 12/18/2023 DMON Exceedance of R2-2021-0010, Section V. SCQ did not sample for Dissolved Oxygen in milligrams per liter (mg/L). SCQ will retrain sampling staff on proper sampling techniques. Violation B eSMR
1123381 12/18/2023 DMON Exceedance of R2-2021-0010, Section V. SCQ did not sample for Dissolved Oxygen in milligrams per liter (mg/L). SCQ will retrain sampling staff on proper sampling techniques. Violation B eSMR
1123568 12/18/2023 DMON Exceedance of R2-2021-0010, Section V. SCQ did not sample for Dissolved Oxygen in milligrams per liter (mg/L). SCQ will retrain sampling staff on proper sampling techniques. Violation U eSMR
1123569 12/18/2023 DMON Exceedance of R2-2021-0010, Section V. SCQ did not sample for Dissolved Oxygen in milligrams per liter (mg/L). SCQ will retrain sampling staff on proper sampling techniques. Violation U eSMR
1123571 12/18/2023 DMON Exceedance of R2-2021-0010, Section V. SCQ did not sample for Dissolved Oxygen in milligrams per liter (mg/L). SCQ will retrain sampling staff on proper sampling techniques. Violation U eSMR
1123574 12/18/2023 DMON Exceedance of R2-2021-0010, Section V. SCQ did not sample for Dissolved Oxygen in milligrams per liter (mg/L). SCQ will retrain sampling staff on proper sampling techniques. Violation U eSMR
1123577 12/18/2023 CAT2 Chromium (VI) Monthly Average limit is 5.6 ug/L and reported value was 7.3 ug/L at EFF-004. Stevens Creek Quarry (SCQ) will conduct internal monitoring of the Active Treatment System (ATS) to evaluate the source of the exceedance and the performance of the ATS. Based on the ATS evaluation, SCQ will implement needed repairs as they arise and continue to conduct routine sediment removal of the settling tanks to optimize performance. Violation U eSMR
1123378 12/18/2023 Surface Water Exceedance of R2-2021-0010, Section V. Turbidity, Instantaneous Maximum limit is 50 NTU and reported value was 127.47 NTU. Stevens Creek Quarry (SCQ) will conduct internal monitoring of the Site to evaluate the source of the exceedance. Based on the Site evaluation, SCQ will implement needed repairs as they arise and continue to conduct routine sediment removal of the settling tanks to optimize BMP performance. Violation B eSMR
1123570 12/18/2023 Surface Water Exceedance of R2-2021-0010, Section V. Turbidity, Instantaneous Maximum limit is 50 NTU and reported value was 127.47 NTU. Stevens Creek Quarry (SCQ) will conduct internal monitoring of the Site to evaluate the source of the exceedance. Based on the Site evaluation, SCQ will implement needed repairs as they arise and continue to conduct routine sediment removal of the settling tanks to optimize BMP performance. Violation U eSMR
1115052 02/28/2023 CAT2 Chromium (VI) Monthly Average limit is 5.6 ug/L and reported value was 5.9 ug/L at EFF-004. Stevens Creek Quarry (SCQ) will conduct internal monitoring of the Active Treatment System (ATS) to evaluate the source of the exceedance and the performance of the ATS. Based on the ATS evaluation, SCQ will implement needed repairs as they arise and continue to conduct routine sediment removal of the settling tanks to optimize performance. Violation B eSMR
1123576 02/28/2023 CAT2 Chromium (VI) Monthly Average limit is 5.6 ug/L and reported value was 5.9 ug/L at EFF-004. Stevens Creek Quarry (SCQ) will conduct internal monitoring of the Active Treatment System (ATS) to evaluate the source of the exceedance and the performance of the ATS. Based on the ATS evaluation, SCQ will implement needed repairs as they arise and continue to conduct routine sediment removal of the settling tanks to optimize performance. Violation U eSMR
1114157 01/31/2023 CAT2 Copper, Total Monthly Average limit is 14 ug/L and reported value was 65 ug/L at EFF-004. Stevens Creek Quarry (SCQ) will conduct internal monitoring of the Active Treatment System (ATS) to evaluate the source of the exceedance and the performance of the ATS. Based on the ATS evaluation, SCQ will implement needed repairs as they arise and continue to conduct routine sediment removal of the settling tanks to optimize performance. Violation B eSMR
1114159 01/31/2023 CAT2 Lead, Total Monthly Average limit is 8.1 ug/L and reported value was 16 ug/L at EFF-004. Stevens Creek Quarry (SCQ) will conduct internal monitoring of the Active Treatment System (ATS) to evaluate the source of the exceedance and the performance of the ATS. Based on the ATS evaluation, SCQ will implement needed repairs as they arise and continue to conduct routine sediment removal of the settling tanks to optimize performance. Violation B eSMR
1114156 01/31/2023 CAT2 Nickel, Total Monthly Average limit is 93 ug/L and reported value was 130 ug/L at EFF-004. Stevens Creek Quarry (SCQ) will conduct internal monitoring of the Active Treatment System (ATS) to evaluate the source of the exceedance and the performance of the ATS. Based on the ATS evaluation, SCQ will implement needed repairs as they arise and continue to conduct routine sediment removal of the settling tanks to optimize performance. Violation B eSMR
1114160 01/09/2023 OEV pH Daily Maximum limit is 8.9 SU and reported value was 8.93 SU at EFF-006. Stevens Creek Quarry (SCQ) will assess the pH meter's accuracy by making sure the field meter is properly calibrated and rinsed with distilled water. SCQ will determine if the pH is faulty and assess if a new meter is needed for the project. Violation B eSMR
1123566 01/09/2023 OEV pH Instantaneous Maximum limit is 8.5 SU and reported value was 8.93 SU at EFF-006. Stevens Creek Quarry (SCQ) will assess the pH meters accuracy by making sure the field meter is properly calibrated and rinsed with distilled water. SCQ will determine if the pH is faulty and assess if a new meter is needed for the project. Violation U eSMR
1114158 01/05/2023 OEV pH Instantaneous Maximum limit is 8.5 SU and reported value was 8.75 SU at EFF-004. Stevens Creek Quarry (SCQ) will conduct internal monitoring of the Active Treatment System (ATS) to evaluate the source of the exceedance and the performance of the ATS. Based on the ATS evaluation, SCQ will implement needed repairs as they arise and continue to conduct routine sediment removal of the settling tanks to optimize performance. Violation B eSMR
1123567 01/05/2023 OEV pH Instantaneous Maximum limit is 8.5 SU and reported value was 8.75 SU at EFF-004. Stevens Creek Quarry (SCQ) will conduct internal monitoring of the Active Treatment System (ATS) to evaluate the source of the exceedance and the performance of the ATS. Based on the ATS evaluation, SCQ will implement needed repairs as they arise and continue to conduct routine sediment removal of the settling tanks to optimize performance. Violation U eSMR
1114161 01/05/2023 CAT2 Copper, Total Daily Maximum limit is 34 ug/L and reported value was 65 ug/L at EFF-004. Stevens Creek Quarry (SCQ) will conduct internal monitoring of the Active Treatment System (ATS) to evaluate the source of the exceedance and the performance of the ATS. Based on the ATS evaluation, SCQ will implement needed repairs as they arise and continue to conduct routine sediment removal of the settling tanks to optimize performance. Violation B eSMR
1123564 01/05/2023 CAT2 Copper, Total Maximum Daily (MDEL) limit is 35 ug/L and reported value was 65 ug/L at EFF-004. Stevens Creek Quarry (SCQ) will conduct internal monitoring of the Active Treatment System (ATS) to evaluate the source of the exceedance and the performance of the ATS. Based on the ATS evaluation, SCQ will implement needed repairs as they arise and continue to conduct routine sediment removal of the settling tanks to optimize performance. Violation U eSMR
1123563 01/05/2023 CAT2 Copper, Total Monthly Average limit is 14 ug/L and reported value was 65 ug/L at EFF-004. Stevens Creek Quarry (SCQ) will conduct internal monitoring of the Active Treatment System (ATS) to evaluate the source of the exceedance and the performance of the ATS. Based on the ATS evaluation, SCQ will implement needed repairs as they arise and continue to conduct routine sediment removal of the settling tanks to optimize performance. Violation U eSMR
1123575 01/05/2023 CAT2 Lead, Total Monthly Average limit is 8.1 ug/L and reported value was 16 ug/L at EFF-004. Stevens Creek Quarry (SCQ) will conduct internal monitoring of the Active Treatment System (ATS) to evaluate the source of the exceedance and the performance of the ATS. Based on the ATS evaluation, SCQ will implement needed repairs as they arise and continue to conduct routine sediment removal of the settling tanks to optimize performance. Violation U eSMR
1123565 01/05/2023 CAT2 Nickel, Total Maximum Daily (MDEL) limit is 93 ug/L and reported value was 130 ug/L at EFF-004. Stevens Creek Quarry (SCQ) will conduct internal monitoring of the Active Treatment System (ATS) to evaluate the source of the exceedance and the performance of the ATS. Based on the ATS evaluation, SCQ will implement needed repairs as they arise and continue to conduct routine sediment removal of the settling tanks to optimize performance. Violation U eSMR
1123572 01/05/2023 Surface Water Exceedance of R2-2021-0010, Section V. Turbidity, Instantaneous Maximum limit is 50 NTU and reported value was 797 NTU. Stevens Creek Quarry (SCQ) will conduct internal monitoring of the Site to evaluate the source of the exceedance. Based on the Site evaluation, SCQ will implement needed repairs as they arise and continue to conduct routine sediment removal of the settling tanks to optimize BMP performance. Violation U eSMR
1123573 01/05/2023 Surface Water Exceedance of R2-2021-0010, Section V. pH, Instantaneous Maximum limit is <6.5; or >8.5 SU and reported value was 8.68 SU. Stevens Creek Quarry (SCQ) will conduct internal monitoring of the Site to evaluate the source of the exceedance. Based on the Site evaluation, SCQ will implement needed repairs as they arise and continue to conduct routine sediment removal of the settling tanks to optimize BMP performance. Violation U eSMR
1103739 03/31/2022 CAT2 Chromium (VI) Monthly Average limit is 5.6 ug/L and reported value was 26 ug/L at EFF-003. The Quarry drew down the water level in Sediment Trap 2 that discharges at 003 and refreshed the erosion control BMPs prior to the next storm event. Violation B eSMR
1103736 03/31/2022 CAT2 Copper, Total Monthly Average limit is 14 ug/L and reported value was 23 ug/L at EFF-002. The Quarry drew down the water level in Sediment Trap 1 that discharges at 002 and refreshed the erosion control BMPs prior to the next storm event. Violation B eSMR
1103737 03/31/2022 CAT2 Copper, Total Monthly Average limit is 14 ug/L and reported value was 43 ug/L at EFF-003. The Quarry drew down the water level in Sediment Trap 2 that discharges at 003 and refreshed the erosion control BMPs prior to the next storm event. Violation B eSMR
1103738 03/28/2022 CAT2 Chromium (VI) Daily Maximum limit is 16 ug/L and reported value was 26 ug/L at EFF-003. The Quarry drew down the water level in Sediment Trap 2 that discharges at 003 and refreshed the erosion control BMPs prior to the next storm event. Violation B eSMR
1103740 03/28/2022 CAT2 Copper, Total Daily Maximum limit is 34 ug/L and reported value was 43 ug/L at EFF-003. The Quarry drew down the water level in Sediment Trap 2 that discharges at 003 and refreshed the erosion control BMPs prior to the next storm event. Violation B eSMR
1099661 12/13/2021 CAT2 Chromium (VI) Daily Maximum limit is 16 ug/L and reported value was 26 ug/L at EFF-003. The Quarry will draw down the water level in Sediment Trap 2 that discharges at 003 and refresh the erosion control BMPs prior to the next storm event. Violation U eSMR
1099663 12/13/2021 CAT2 Chromium (VI) Monthly Average limit is 5.6 ug/L and reported value was 12 ug/L at EFF-004. An advanced treatment system (ATS) was installed and has been in operation as of January 1, 2022. Runoff will be routed through the ATS prior to discharge at 004. Violation B eSMR
1099656 12/13/2021 CAT2 Chromium (VI) Monthly Average limit is 5.6 ug/L and reported value was 26 ug/L at EFF-003. The Quarry will draw down the water level in Sediment Trap 2 that discharges at 003 and refresh the erosion control BMPs prior to the next storm event. Violation B eSMR
1099660 12/13/2021 CAT2 Copper, Total Daily Maximum limit is 34 ug/L and reported value was 46 ug/L at EFF-004. An advanced treatment system (ATS) was installed and has been in operation as of January 1, 2022. Runoff will be routed through the ATS prior to discharge at 004. Violation B eSMR
1099658 12/13/2021 CAT2 Copper, Total Daily Maximum limit is 34 ug/L and reported value was 76 ug/L at EFF-003. The Quarry will draw down the water level in Sediment Trap 2 that discharges at 003 and refresh the erosion control BMPs prior to the next storm event. Violation B eSMR
1099659 12/13/2021 CAT2 Copper, Total Monthly Average limit is 14 ug/L and reported value was 46 ug/L at EFF-004. An advanced treatment system (ATS) was installed and has been in operation as of January 1, 2022. Runoff will be routed through the ATS prior to discharge at 004. Violation B eSMR
1099657 12/13/2021 CAT2 Copper, Total Monthly Average limit is 14 ug/L and reported value was 76 ug/L at EFF-003. The Quarry will draw down the water level in Sediment Trap 2 that discharges at 003 and refresh the erosion control BMPs prior to the next storm event. Violation B eSMR
1099662 12/13/2021 CAT2 Lead, Total Monthly Average limit is 8.1 ug/L and reported value was 13 ug/L at EFF-003. The Quarry will draw down the water level in Sediment Trap 2 that discharges at 003 and refresh the erosion control BMPs prior to the next storm event. Violation B eSMR
1099664 12/13/2021 CAT2 Lead, Total Monthly Average limit is 8.1 ug/L and reported value was 9.6 ug/L at EFF-004. An advanced treatment system (ATS) was installed and has been in operation as of January 1, 2022. Runoff will be routed through the ATS prior to discharge at 004. Violation B eSMR
1099665 12/13/2021 CAT2 Nickel, Total Monthly Average limit is 93 ug/L and reported value was 120 ug/L at EFF-003. The Quarry will draw down the water level in Sediment Trap 2 that discharges at 003 and refresh the erosion control BMPs prior to the next storm event. Violation B eSMR
1099649 10/25/2021 CAT2 Copper, Total Monthly Average limit is 14 ug/L and reported value was 25 ug/L at EFF-002. The Quarry drew down the water level in Sediment Trap 1 that discharges at 002 and refreshed the erosion control BMPs prior to the next storm event. Violation B eSMR
Report displays most recent five years of violations. Refer to the Interactive Violation Report for more data.
Total Violations: 49 Priority Violations: 0
*Click the "(+/-) Violation Description" link to expand and contract the violation description.
*As of 5/20/2010, the Water Board's Enforcement Policy requires that all violations be classified as 1, 2 or 3, with class 1 being the highest. Prior to this, violations were simply classified as Yes or No. If a 123 classification has been assigned to a violation that occurred before this date, that classification data will be displayed instead of the Yes/No data.
Violation Types
CAT2 = Category 2 Pollutant (Effluent Violation for Group 2 Pollutant) DMON = Deficient Monitoring
OEV = Other Effluent Violation Surface Water = Surface Water
Expand/Contract Enforcement Actions
Enforcement Actions
Enf Id Enf Type Enf Order No. Effective Date Status
444599 Cease and Desist Order R2-2021-0011 07/01/2021 Active
Total Enf Actions: 1
Expand/Contract Inspections
Inspections
Inspection ID Inspection Type Lead Inspector Actual End Date Planned Violations Attachment
Total Inspections: 0 Last Inspection: None
  
The current report was generated with data as of: 05/29/2024
Regional Boards are in the process of entering backlogged data.
As a result, data may be incomplete.
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