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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
624263 Jason Voss Person Legally Responsible Official 05/12/2021 None None
629196 Lisa Welsh Person Data Submitter 11/19/2021 None None
364108 Adrienne Miller Person Data Submitter 08/26/2021 None None
627172 Julio Cazares Person Data Submitter 08/26/2021 None None
627845 Neftali Romero Person Data Submitter 09/27/2021 None None
629636 Ryan Charney Person Data Submitter 12/08/2021 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 year
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.
1138254 11/30/2024 CAT2 Chromium (VI) Monthly Average limit is 5.6 ug/L and reported value was 7.6 ug/L Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
1141717 02/28/2025 CAT2 Chromium (VI) Monthly Average (Mean) limit is 5.6 ug/L and reported value was 13 Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
1139645 11/25/2024 Deficient Monitoring On November 25, SCQ collected an acute toxicity sample at EFF-004, which followe Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 N
1139193 12/16/2024 CAT2 Chromium (VI) Daily Maximum limit is 16 ug/L and reported value was 40 ug/L at E 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 a Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
1139195 12/16/2024 ATOX Acute Toxicity-Fathead Minnow-survival Instantaneous Minimum limit is 70 % survi 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 a Violation N eSMR Stevens Creek Quarry 443276 R2-2021-0010 Y
Report defaults to display violations within the last year. Click here to see last five years of violations. Refer to the Interactive Violation Report for more data.
Total Violations: 7
*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: 10/31/2025
Regional Boards are in the process of entering backlogged data.
As a result, data may be incomplete.
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