Grand Terrace Municipal Code Art. V Construction Requirements

Prior to the issuance of any grading or building permit, all qualifying land development/redevelopment projects shall submit and have approved a stormwater quality management plan (SWQMP) to the Director of Building & Safety/Public Works on a form provided by the City. The SWQMP shall identify all BMPs that will be incorporated into the project to control stormwater and non-stormwater pollutants during and after construction and shall be revised as necessary during the life of the project. The SWQMP submittal applies to construction projects covered by the NPDES general construction permit as well as construction projects less than one acre. Qualifying development/redevelopment projects include:

A. Home subdivisions of ten units or more. This includes single-family residences, multi-family residences, condominiums, apartments.

B. Commercial developments of 100,000 square feet or more. This includes non-residential developments such as hospitals, educational institutions, recreational facilities, mini-malls, hotels, office buildings, warehouses, and light industrial facilities.

C. Vehicle maintenance shops (SIC codes 5013, 5014, 5541, 7532-7534, 7536-7539).

D. Food service businesses developing 5,000 square feet or more of land area.

E. All hillside developments on 10,000 square feet or more, which are located on areas with known erosive soil conditions or where the natural slope is 25 percent or more.

F. Developments of 2,500 square feet of impervious surface or more adjacent to (within 200 feet) or discharging directly into environmentally sensitive areas such as areas designated in the Ocean Plan as areas of special biological significance or water bodies listed in Section 303(d) of the Clean Water Act.

G. Parking lots of 5,000 square feet or more exposed to stormwater. "Parking lot" is defined as land area or facility for the temporary storage of motor vehicles.

H. All re-development projects adding 5,000 square feet or more of impervious surface on an already developed site. This includes additional buildings and/or structures, extension of an already existing building footprint, and construction of parking lots.

I. Retail Gasoline Outlets (RGOs) that are either 5,000 square feet or more, or have projected average daily traffic of 100 or more vehicles per day.

J. Emergency public safety projects in any of the above-listed categories shall be excluded if the delay caused due to the requirement for a WQMP compromises public safety, public health and/or environmental protection.

(Ord. No. 262, § 2, 4-10-2012)

A. Any developer/owner engaging in construction activities which disturb one acre or more of land shall apply for coverage under the general stormwater permit for construction activity with the State Water Resources Control Board (SWRCB). Any developer/owner engaging in construction activities which disturb less than one acre but are part of a larger common plan of development or sale that is greater than one acre must also apply for coverage under the general stormwater permit for construction activity with the SWRCB. "Construction activity" includes, but is not limited to, clearing, grading, demolition, excavation, construction of new structures, and reconstruction of existing facilities involving removal and replacement that results in soil disturbance. The owner of the land where the construction activity is occurring is responsible for obtaining coverage under the permit. Owners may obtain coverage under the general permit by completing a "notice of intent" form (NOI) and mailing the form along with a vicinity map and the appropriate fee to the office of the SWRCB. The NOI form and checklist of items to submit to the state is available from the SWRCB. In addition, the owner shall also prepare a stormwater pollution prevention plan (SWPPP) in accordance with State requirements.

B. Prior to obtaining any City-issued grading and/or construction permits the developer/owner shall provide evidence of compliance with the general construction permit by providing a copy of the waste discharger's identification number (WDID) to the Building & Safety/Public Works Department.

(Ord. No. 262, § 2, 4-10-2012)

A. Discharges of non-stormwater from construction activities are generally prohibited except for those discharges listed in Section 13.20.110 of this Chapter or any discharges authorized by the Director of Building & Safety/Public Works or the Regional Water Quality Control Board (RWQCB). The City and the RWQCB will allow the discharge of certain non-stormwater discharges from construction sites, provided they are in compliance with the discharge limitations specified in the current General Waste Discharge Requirements for De Minimus Discharges issued by the RWQCB, Santa Ana Region.

B. The following discharges are authorized provided they are in compliance with the permit:

1. Construction dewatering wastes.

2. Wastes associated with well installation, development, test pumping and purging.

3. Aquifer testing wastes.

4. Dewatering wastes from subterranean seepage, except for discharges from utility company vaults.

5. Discharges resulting from hydrostatic testing, such as of vessels, pipelines, tanks.

6. Discharges resulting from the maintenance of potable water supply pipelines, tanks, and reservoirs.

7. Discharges resulting from the disinfection of potable water supply pipelines, tanks, and reservoirs.

8. Discharges from potable water supply systems resulting from system failures and pressure releases.

9. Discharges from fire hydrant testing or flushing.

(Ord. No. 262, § 2, 4-10-2012)

Authorized non-stormwater discharges under Section 13.20.280 shall be reported to the Director of Building & Safety/Public Works at least five days prior to a planned discharge. Unplanned discharges of non-stormwater into the City's storm drainage system shall be reported as soon as possible and before any discharge is initiated. Monitoring may also be required for these discharges. A report shall be submitted prior to discharge which includes the following information:

A. Type of proposed discharge.

B. Estimated average and maximum daily flow rate.

C. Frequency and duration of discharge.

D. A description of the proposed treatment system (if appropriate).

E. A description of the path from the point of discharge to the nearest storm drain inlet. All discharges shall be monitored daily for flow volume and shall be recorded in a daily log by the person responsible for the discharge. Discharges shall also be sampled during the first 30 minutes of each discharge and weekly thereafter for continuous discharges for chlorine and total suspended solids. Monitoring data for flow, chlorine and suspended solids and any other required constituents shall be reported to the City Director of Building & Safety/Public Works Department, Environmental Section on a weekly basis.

(Ord. No. 262, § 2, 4-10-2012)

All construction projects which could potentially have an adverse impact on the City's stormwater drainage system or waters of the State shall install and/or implement appropriate construction and post- construction BMPs, as listed in their SWQMP or the "California Stormwater Best Management Practice Handbook", to reduce pollutants to the maximum extent practicable or to the extent required by law.

(Ord. No. 262, § 2, 4-10-2012)

The City Manager or his or her designee is authorized to sign all water quality management plan access, transfer and maintenance agreement documents entered into by the City with project proponents for the on-going and long-term maintenance of all approved stormwater treatment devices, structures and administrative policies designed to minimize the detrimental effects of new development projects on receiving waters, including effects caused by increased pollutant loads and changes in hydrology.

(Ord. No. 262, § 2, 4-10-2012)