South El Monte Operable Unit Sentinel Well


SCH Number
Public Agency
San Gabriel Basin Water Quality Authority
Document Title
South El Monte Operable Unit Sentinel Well
Document Type
NOE - Notice of Exemption
Document Description
The Main San Gabriel Basin provides drinking water for over a million residents. Volatile Organic Compound (VOC) contamination was discovered in several areas during the late 1970s. In 1984, the San Gabriel Valley was placed on the U.S. Environmental Protection Agency's National Priorities List (Superfund). The South El Monte Operable Units is one of the areas requiring cleanup under the Superfund laws. San Gabriel Valley Water Company (SGVWC) operates a VOC treatment facility within the SEMOU at its Plant 8 well field. The California Department of Health Services (DHS) is the agency responsible for permitting drinking water treatment plants. DHS requires that a Sentinel Well be installed upgradient of SGVWC's Plant 8 treatment facility to provide early warning detection of possible new and/or increased contaminant migration towards SGVWCs Plant 8 treatment facility. Therefore, the project consists of the installation of a 4-inch diameter, 320-feet deep Sentinel Well in the City of South El Monte for the purpose of data collection and semiannual monitoring of the groundwater in the immediate area.

Contact Information

Randy Schoellerman
Agency Name
San Gabriel Basin Water Quality Authority
Contact Types
Lead/Public Agency


El Monte
Los Angeles

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
Sec. 15306
Reasons for Exemption
California Code of Regulations Section 15306 "Basic data collection, research, experimental management, and resource evaluation activities which do not result in a serious or major disturbance to an environmental resource."

Disclaimer: The document was originally posted before CEQAnet had the capability to host attachments for the public. To obtain the original attachments for this document, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at or via phone at (916) 445-0613.

Download CSV New Search Print