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California Integrated Water Quality System Project (CIWQS)
   Party At-A-Glance Report

  
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General Information
Party ID Party Name Party Classification Mailing Address Work Phone Email/Website
624262 Stevens Creek Quarry, Inc. Privately-Owned Business 12100 Stevens Canyon Road Cupertino, CA 95014 408-253-2512 None
  
  
  
  
Expand/Contract Related Places
Related Places
Place ID Place Name County Region Place Type Relationship to Party Relationship Start Date Relationship End Date
863643 Stevens Creek Quarry Santa Clara 2 Sand and Gravel Mining Owner and Operator 05/12/2021 None
Total Related Places: 1
  
  
  
  
Expand/Contract Related Parties
Related Parties
Party ID Party Name Party Type Role/Relationship Relationship Start Date Relationship End Date Classification
629636 Ryan Charney Person Data Submitter 12/08/2021 None None
629196 Lisa Welsh Person Data Submitter 11/19/2021 None None
627845 Neftali Romero Person Data Submitter 09/27/2021 None None
627172 Julio Cazares Person Data Submitter 08/26/2021 None None
624263 Jason Voss Person Legally Responsible Official 05/12/2021 None None
364108 Adrienne Miller Person Data Submitter 08/26/2021 None None
Total Related Parties: 6
  
  
  
  
Expand/Contract Regulatory Measures
Regulatory Measures (non-enforcement)
Reg. Measure ID Regulatory Measure Type Region WDID Status Program Order No. RM Effective Date RM Termination Date Relationship Relationship Start Date Relationship End Date Amended?
443276 NPDES Permit 2 2 43I006687 Active NPDMINING R2-2021-0010 07/01/2021 None Discharger 05/12/2021 None N
Total Regulatory Measures: 1
  
  
  
  
Expand/Contract Violations
Violations within the past five years
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.
1141717 02/28/2025 CAT2 Chromium (VI) Monthly Average (Mean) limit is 5.6 ug/L and reported value was 13 ug/L at EFF-004. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
1140523 01/31/2025 CAT2 Chromium (VI) Monthly Average limit is 5.6 ug/L and reported value was 14 ug/L at EFF-004. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
1139655 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. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 N
1139654 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. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 N
1139649 10/15/2024 Deficient Monitoring The discharge observed on October 11, 2024, continued through October 15, 2024. SCQ did not implement Receiving Water Monitoring Requirements, as required by Attachment E, section IV.B, and Table E-4. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 N
1139648 10/11/2024 Order Conditions The discharge of untreated process water from Sediment Trap 3 affected water quality in Swiss Creek during RWQCB inspection was observed on October 11, 2024. The RWQCB observed sediment in the tributary from Discharge Point 004 and foam and aquatic growth downstream of the tributary that was not visible upstream. Permit receiving water limitations V.A.1 and V.A.4 prohibit discharges from causing floating materials (foams, scum), bottom deposits, and aquatic growths that affect the beneficial uses of receiving waters. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 N
1139647 10/15/2024 Deficient Monitoring The discharge observed on October 11, 2024, continued through October 15, 2024. SCQ did not implement Receiving Water Monitoring Requirements, as required by Attachment E, section IV.B, and Table E-4. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 N
1139646 10/15/2024 Deficient Monitoring The discharge observed on October 11, 2024, continued through October 15, 2024. SCQ did not implement Receiving Water Monitoring Requirements, as required by Attachment E, section IV.B, and Table E-4. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 N
1139645 11/25/2024 Deficient Monitoring On November 25, SCQ collected an acute toxicity sample at EFF-004, which followed the proper sampling technique and occurred under normal ATS operating conditions. On November 26, 2024, discharge ceased from EFF-004. On November 27, SCQ was notified by the laboratory via email, that it did not conduct the acute toxicity test due to using the wrong sample for testing. Therefore, the original sample extended beyond the 36-hour hold time and the acute toxicity test could not be completed. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 N
1139643 02/01/2024 CAT1 Settleable Solids Daily Maximum limit is 1 ml/L/hr and reported value was 3 ml/L/hr at EFF-004. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
1139640 10/11/2024 Order Conditions An unauthorized discharge of untreated process water from Sediment Trap 3 at Discharge Point 004 during RWQCB inspection was observed on October 11, 2024. The untreated process water flowed to a receiving water (Swiss Creek) through a space between a black, plastic pipe (discharge pipe from a treatment system) and a concrete culvert that the discharge pipe was installed into. The discharge, which was ongoing during the inspection, violated Permit discharge prohibitions III.A and III.B and monitoring requirements in Permit Attachment E, section III.A. The RWQCB sent SCQ an Inspection Report on December 27, 2024, notifying them of the observed unauthorized discharge and a request for corrective actions. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 N
1139639 10/11/2024 Deficient Monitoring An unauthorized discharge of untreated process water from Sediment Trap 3 at Discharge Point 004 during RWQCB inspection was observed on October 11, 2024. The untreated process water flowed to a receiving water (Swiss Creek) through a space between a black, plastic pipe (discharge pipe from a treatment system) and a concrete culvert that the discharge pipe was installed into. The discharge, which was ongoing during the inspection, violated Permit discharge prohibitions III.A and III.B and monitoring requirements in Permit Attachment E, section III.A. Samples were not collected at the time of the inspection. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 N
1139638 10/15/2024 Deficient Monitoring The discharge observed on October 11, 2024, continued through October 15, 2024. SCQ did not implement Receiving Water Monitoring Requirements, as required by Attachment E, section IV.B, and Table E-4. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 N
1139195 12/16/2024 ATOX Acute Toxicity-Fathead Minnow-survival Instantaneous Minimum limit is 70 % survival and reported value was 65 % survival at EFF-004. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
1139194 12/31/2024 CAT2 Chromium (VI) Monthly Average limit is 5.6 ug/L and reported value was 40 ug/L at EFF-004. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
1139193 12/16/2024 CAT2 Chromium (VI) Daily Maximum limit is 16 ug/L and reported value was 40 ug/L at EFF-004. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
1138254 11/30/2024 CAT2 Chromium (VI) Monthly Average limit is 5.6 ug/L and reported value was 7.6 ug/L at EFF-004. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
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. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
1125370 02/29/2024 CAT2 Chromium (VI) Monthly Average limit is 5.6 ug/L and reported value was 9.8 ug/L at EFF-004. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
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. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
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. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
1124649 01/31/2024 CAT2 Chromium (VI) Monthly Average limit is 5.6 ug/L and reported value was 9.8 ug/L at EFF-004. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
1123574 12/18/2023 Deficient Monitoring Exceedance of R2-2021-0010, Section V. SCQ did not sample for Dissolved Oxygen in milligrams per liter (mg/L). Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 N
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. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 N
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. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 N
1123571 12/18/2023 Deficient Monitoring Exceedance of R2-2021-0010, Section V. SCQ did not sample for Dissolved Oxygen in milligrams per liter (mg/L). Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 N
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. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 N
1123569 12/18/2023 Deficient Monitoring Exceedance of R2-2021-0010, Section V. SCQ did not sample for Dissolved Oxygen in milligrams per liter (mg/L). Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 N
1123568 12/18/2023 Deficient Monitoring Exceedance of R2-2021-0010, Section V. SCQ did not sample for Dissolved Oxygen in milligrams per liter (mg/L). Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 N
1123381 12/18/2023 Deficient Monitoring Exceedance of R2-2021-0010, Section V. SCQ did not sample for Dissolved Oxygen in milligrams per liter (mg/L). Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 N
1123380 12/18/2023 Deficient Monitoring Exceedance of R2-2021-0010, Section V. SCQ did not sample for Dissolved Oxygen in milligrams per liter (mg/L). Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 N
1123379 12/18/2023 Deficient Monitoring Exceedance of R2-2021-0010, Section V. SCQ did not sample for Dissolved Oxygen in milligrams per liter (mg/L). Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 N
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. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
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. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
1123376 12/18/2023 Deficient Monitoring Exceedance of R2-2021-0010, Section V. SCQ did not sample for Dissolved Oxygen in milligrams per liter (mg/L). Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 N
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. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
1114161 01/05/2023 CAT2 Copper, Total Daily Maximum limit is 34 ug/L and reported value was 65 ug/L at EFF-004. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
1114160 01/09/2023 OEV pH Instantaneous Maximum limit is 8.5 SU and reported value was 8.93 SU at EFF-006. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
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. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
1114158 01/05/2023 OEV pH Instantaneous Maximum limit is 8.5 SU and reported value was 8.75 SU at EFF-004. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
1114157 01/31/2023 CAT2 Copper, Total Monthly Average limit is 14 ug/L and reported value was 65 ug/L at EFF-004. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
1114156 01/31/2023 CAT2 Nickel, Total Monthly Average limit is 93 ug/L and reported value was 130 ug/L at EFF-004. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
1103740 03/28/2022 CAT2 Copper, Total Daily Maximum limit is 34 ug/L and reported value was 43 ug/L at EFF-003. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
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. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
1103738 03/28/2022 CAT2 Chromium (VI) Daily Maximum limit is 16 ug/L and reported value was 26 ug/L at EFF-003. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
1103737 03/31/2022 CAT2 Copper, Total Monthly Average limit is 14 ug/L and reported value was 43 ug/L at EFF-003. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
1103736 03/31/2022 CAT2 Copper, Total Monthly Average limit is 14 ug/L and reported value was 23 ug/L at EFF-002. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
1099665 12/31/2021 CAT2 Nickel, Total Monthly Average limit is 93 ug/L and reported value was 120 ug/L at EFF-003. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
1099664 12/31/2021 CAT2 Lead, Total Monthly Average limit is 8.1 ug/L and reported value was 9.6 ug/L at EFF-004. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
1099663 12/31/2021 CAT2 Chromium (VI) Monthly Average limit is 5.6 ug/L and reported value was 12 ug/L at EFF-004. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
1099662 12/31/2021 CAT2 Lead, Total Monthly Average limit is 8.1 ug/L and reported value was 13 ug/L at EFF-003. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
1099661 12/13/2021 CAT2 Chromium (VI) Daily Maximum limit is 16 ug/L and reported value was 26 ug/L at EFF-003. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
1099660 12/13/2021 CAT2 Copper, Total Daily Maximum limit is 34 ug/L and reported value was 46 ug/L at EFF-004. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
1099659 12/31/2021 CAT2 Copper, Total Monthly Average limit is 14 ug/L and reported value was 46 ug/L at EFF-004. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
1099658 12/13/2021 CAT2 Copper, Total Daily Maximum limit is 34 ug/L and reported value was 76 ug/L at EFF-003. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
1099657 12/31/2021 CAT2 Copper, Total Monthly Average limit is 14 ug/L and reported value was 76 ug/L at EFF-003. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
1099656 12/31/2021 CAT2 Chromium (VI) Monthly Average limit is 5.6 ug/L and reported value was 26 ug/L at EFF-003. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
1099649 10/31/2021 CAT2 Copper, Total Monthly Average limit is 14 ug/L and reported value was 25 ug/L at EFF-002. Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
Report currently showing last five years of violations. Click here to return to viewing one year of violations. Refer to the Interactive Violation Report for more data.
Total Violations: 58
*Click the "(+/-) Violation Description" link to expand and contract the violation description.
  
  
  
  
Expand/Contract Enforcement Actions
Enforcement Actions
Enforcement ID Enforcement Type Enf. Order No. Title Program Effective Date Status
444599 Cease and Desist Order R2-2021-0011 Cease and Desist Order R2-2021-0011 for Cupertino Quarry (Stevens Creek Quarry, Inc.) NPDMINING 07/01/2021 Active
Total Enforcement Actions: 1
  
  
  
  
Expand/Contract Enforcement Actions
Regulatory Measures linked to Related Parties
Reg. Measure ID Organization Regulatory Measure Type Program Effective Date Status
Total Regulatory Measures linked to Related Parties: 0
  
  
The current report was generated with data as of: 06/23/2025
Regional Boards are in the process of entering backlogged data.
As a result, data may be incomplete.
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