New Construction/ Modification/Addendum/ UST Addition To HMUSP 
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| New Construction/Modification/Addendum/UST Addition To HMUSP |
Modifications and/or addendum's to the underground storage tank system may be made only if permitted by the DPW Environmental Programs Division. A modification is any change to an existing UST's primary and/or secondary containment, including piping, under dispenser containment, fill and/or piping sumps, overfill protection or how the UST system is monitored. In the case where the modification involves removing and replacing piping and/or dispensers, a closure report (with soil sampling results) will be required. An addendum refers to a change to less integral part of the UST system, such as a change of sensor, and minor changes to the approved plans.
To make changes to a UST system component, such as removing piping and or dispensers, generally the requirements for new tank installation apply except that vent and vacuum recovery piping are not required to be double walled, enhanced leak detection is not required, and the Unified Program Facility form, Certification of Financial Responsibility, and the Hazardous Materials Underground Storage Permit application fee and the pro-rated Annual Maintenance fee in most cases do not need to be submitted.
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New Construction/Modification/Addendum/ UST Addition Forms
- Complete New Construction Plan Clearance/Addendum (PDF, 24 KB) application form;
- Submit all fees payable to the Los Angeles County Department of Public Works (for HMUSP, pro-rated Annual Permit Maintenance Fee, and new construction plan clearance fees);
- Complete Unified Program Forms BUSINESS (DOC, 102 KB), FACILITY INFORMATION (DOC, 174 KB), TANK INFORMATION (DOC, 162 KB) and MONITORING PLAN (DOC, 226 KB);
- Complete Certification of Financial Responsibility form;
- Submit work plan to perform enhanced leak detection or other approved method;
- Submit Response Plan;
- Permits/clearance for installations must also be obtained from the Los Angeles County Fire Department or local city fire department, the DPW Building and Safety Division or local city building and safety equivalent, either the South Coast or Antelope Valley Air Quality Management Districts (AQMD), and other contractor health and safety permits.
Plans
At least 4 sets of plans need to be submitted. Submitted plans should include the following:
- Site plan to scale depicting the tank(s) and fill and piping sumps, type of hazardous material to be stored, piping layout (product/waste, vapor recovery (gasoline), tank vent, remote fill) and dispensers (if any), location of monitoring system panel, audible/visual alarms (if any), building structures, streets (and cross street), utilities, and north arrow;
- A detailed parts list which includes the manufacturer name, model number, and third party approval of equipment to be installed. The parts list should include (but not be limited to):
- Double-walled tank, size and product to be stored;
- Spill buckets; drop tube; overfill protection device(s) - Phase I Enhanced Vapor Recovery equipment (see Air Resources Board Executive Orders)
- Sumps (fill and piping);
- Double-walled piping (product, vent, vapor recovery, remote fill, flex) and sizes; Penetration/bulkhead fittings/test boots;
- Turbine (for pressurized systems);
- Automatic Line Leak Detector (for pressurized systems);
- Under dispenser containment (UDC);
- Monitoring panel and alarm;
- Monitoring sensors for tank interstitial, automatic tank gage and/or high level alarm (if any), fill and piping sump sensors, UDC sensors and vacuum sensors.
- Detail drawing of each: All primary and secondary containment equipment which is designed to hold hazardous materials (tanks, sumps, penetration fittings, piping, UDC) must be labeled as being product tight.
- Tank details should show the parts listed above at a minimum.
All construction must conform to the requirements of the California Health & Safety Code (HSC) and California Code of Regulations (CCR) as well as local fire and building and safety codes.
When construction is completed
The CERTIFICATION OF INSTALLATION / MODIFICATION form (DOC, 220 KB), tank tightness testing, line test results, results of enhanced leak detection or other approved method to satisfy requirements of the HSC/CCR, secondary containment testing results, monitoring system certification and line leak detector certification, must be submitted to DPW EPD before the UST system is put into service.
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Sponsored by the County of Los Angeles
Department of Public Works
Environmental Programs Division
900 S. Fremont Ave,
3rd Floor Annex
Alhambra, CA 91803-1331
Call toll free at 1(888)CLEAN LA
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