725-6MW-0319- Install Sentinel Wells
Summary
SCH Number
2025061383
Public Agency
California Department of Transportation, District 7
(DOT)
Document Title
725-6MW-0319- Install Sentinel Wells
Document Type
NOE - Notice of Exemption
Received
Posted
6/30/2025
Document Description
Marathon Petroleum Company proposes the installation of two (2) sentinel wells CW-14- B3 and CW-14-B4 at the southwest corner of the clover leaf area located within Caltrans right-of-way along Interstate (I-)710 at Post Mile (PM) 18.36, as well as to perform traffic control activities in the City of South Gate, Los Angeles County. The proposed work will entail the installation of the proposed wells as a two-well cluster with 20-foot screens installed at separate depths within the gage Aquifer. Well CW-14-B3 will be installed at the upper portion of the Gage Aquifer and CW-14-B4 will be installed at the lower portion of the Gage Aquifer system. Marathon Petroleum Company is requesting a temporary encroachment permit to access Caltrans right-of-way along I- 710 at PM 18.36 to complete the above-mentioned work and to perform associated temporary traffic control activities. In addition, the wells will need to be accessed for sampling twice a year for a period of five (5) years following well construction. Excavation will have a maximum depth of 3360-inches, a maximum width of 12-inches and a maximum length of one (1) linear foot. No public utilities will be relocated, and no new right-of-way will be acquired for the project.
Contact Information
Name
Susan Koo
Agency Name
Caltrans
Job Title
Senior Environmental Scientist
Contact Types
Lead/Public Agency
Phone
Email
Name
Susan Koo
Agency Name
Caltrans
Job Title
Senior Environmental Scientist
Contact Types
Lead/Public Agency
Phone
Email
Name
Chad Roper
Agency Name
Marathon Petroleum Company
Job Title
Project Manager
Contact Types
Project Applicant / Parties Undertaking Project
Phone
Location
Cities
South Gate
Counties
Los Angeles
Regions
Statewide
State Highways
SR-710; PM18.36
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
Section 15303
Reasons for Exemption
Install Sentinel Wells