REV: 9/12/2025
13-00-00 PUBLIC WORKS
Series
Code
Series Name Description of Documents © State of California Government Code (GC), Citations & Legal Basis
Office of
REnviron
Complord
Special
Attributes
Total
Retention
13-17-07 Daily Sample Logs Logs of analysis of sewage sludge and discharge. 40 CFR 122.41; 5 years after completion for sewage sludge use & disposal, 3 years after completion for
other discharge records, including calibration records. 40 CFR 141.33; 10 years after completion
40 CFR 141.91; 12 years after completion
State of California Guidelines; Current year plus 10
years for chemical analysis Current year plus 12 years
for compliance records.
Laboratory C+12
13-17-08 Standard Operating Procedure Manuals For quality assurance, standards & methods, refrigerated samples, regulations, standard operating
procedures, inventory and procedures.
40 CFR 122.41; 5 years after completion for sewage
sludge use & disposal, 3 years after completion for
other discharge records, including calibration records. 40 CFR 141.33; 10 years after completion
40 CFR 141.91; 12 years after completion
State of California Guidelines; Current year plus 10
years for chemical analysis Current year plus 12 years
for compliance records.
Department Preference: Maintain SOPs for 12 years
after superseded to meet the longest compliance
retention period.
Laboratory S+12
13-17-09 Calibration Calibration and quality assurance log sheets and reports. Internal and external calibration.
40 CFR 122.41; 3 years for calibration records
Department Preference: Maintain calibration records for at least the current year plus 12 years after completion to match water testing retention under 40 CFR 141.91
and 40 CFR 141.33.
Laboratory C+12
13-17-10 Lab Reports Includes annual, monthly and lab reports for State Water Quality Control Board, sewer system overflows,
and fats, oils & grease inspections.
40 CFR 141.33; 10 years after completion
40 CFR 141.91; 12 years after completion
State of California Guidelines; Current year plus 10
years for chemical analysis.
Laboratory C+12
13-17-11 Contract Laboratories Includes testing results from contract labs such as CalTest.
40 CFR 141.33; 5 years after completion
State of California Guidelines; Current year plus 5 years for bacteriological analysis.
Department Preference: Maintain sub-contracted lab
records for at least the current year plus 12 years to
match retention of water analysis records under 40 CFR
141.91 and 40 CFR 141.33.
Laboratory C+12
13-17-12 Hazardous Waste Manifests Used for chemicals, used oil and other hazardous waste materials.
GC 34090; 2 year minimum requirement
40 CFR 122.21; 3 to 5 years
State of California Guidelines; Current year plus 10
years for hazardous waste disposal documents.
Laboratory C+10
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