Photo Gallery Clark Magnet students collect sediment samples from the mouth of the L.A. River for heavy metals testing

Clark Magnet High School Environmental Geographic Information Systems class students Shaye Holladay McCarthy, left, and Emily Woods, right, collect sediment samples from an area near the mouth of the Los Angeles River, in Long Beach on Wednesday, Sept. 19, 2018. The students, along with a L.A. County Dept. of Education educator spent about three hours on the Harbor Breeze Cruises ship The Christopher collecting samples in and around the mouth of the L.A. River in depths from eight to 30 feet. The samples will be tested for heavy metals and for DNA.

Clark Magnet High School Environmental Geographic Information Systems class students Shaye Holladay McCarthy, left, and Emily Woods, right, collect sediment samples from an area near the mouth of the Los Angeles River, in Long Beach on Wednesday, Sept. 19, 2018. The students, along with a L.A. County Dept. of Education educator spent about three hours on the Harbor Breeze Cruises ship The Christopher collecting samples in and around the mouth of the L.A. River in depths from eight to 30 feet. The samples will be tested for heavy metals and for DNA.  (Raul Roa / Staff Photographer)

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Photo Gallery Clark Magnet students collect sediment samples from the mouth of the L.A. River for heavy metals testing

Clark Magnet High School Environmental Geographic Information Systems class student and project manager Emily Woods uses a mud grabber, or dredge, to collect sediment sample from an area near the mouth of the Los Angeles River, in Long Beach on Wednesday, Sept. 19, 2018. The students, along with a L.A. County Dept. of Education educator spent about three hours on the Harbor Breeze Cruises ship The Christopher collecting samples in and around the mouth of the L.A. River in depths from eight to 30 feet. The samples will be tested for heavy metals and for DNA.  (Raul Roa / Staff Photographer)

Photo Gallery Clark Magnet students collect sediment samples from the mouth of the L.A. River for heavy metals testing

Clark Magnet High School Environmental Geographic Information Systems class students Shaye Holladay McCarthy, left, and Emily Woods, right, collect sediment samples from an area near the mouth of the Los Angeles River, in Long Beach on Wednesday, Sept. 19, 2018. The students, along with a L.A. County Dept. of Education educator spent about three hours on the Harbor Breeze Cruises ship The Christopher collecting samples in and around the mouth of the L.A. River in depths from eight to 30 feet. The samples will be tested for heavy metals and for DNA.  (Raul Roa / Staff Photographer)

Photo Gallery Clark Magnet students collect sediment samples from the mouth of the L.A. River for heavy metals testing

Los Angeles County Dept. of Education educator Jim Matthews, left, speaks with Clark Magnet High School Environmental Geographic Information Systems class students, center, and their teacher Dominique Evans-Bye, right, before collecting sediment samples from an area near the mouth of the Los Angeles River, in Long Beach on Wednesday, Sept. 19, 2018. The students, along with a L.A. County Dept. of Education educator spent about three hours on the Harbor Breeze Cruises ship The Christopher collecting samples in and around the mouth of the L.A. River in depths from eight to 30 feet. The samples will be tested for heavy metals and for DNA. Matthews coordinated the Marine Science Floating Lab.  (Raul Roa / Staff Photographer)

Photo Gallery Clark Magnet students collect sediment samples from the mouth of the L.A. River for heavy metals testing

Clark Magnet High School Environmental Geographic Information Systems student and project GPS coordiantor Shelia Mgrtichian notes GPS locations for each sediment sample collected from an area near the mouth of the Los Angeles River, in Long Beach on Wednesday, Sept. 19, 2018. The students, along with a L.A. County Dept. of Education educator spent about three hours on the Harbor Breeze Cruises ship The Christopher collecting samples in and around the mouth of the L.A. River in depths from eight to 30 feet. The samples will be tested for heavy metals and for DNA.  (Raul Roa / Staff Photographer)

Photo Gallery Clark Magnet students collect sediment samples from the mouth of the L.A. River for heavy metals testing

Clark Magnet High School Environmental Geographic Information Systems class students Shaye Holladay McCarthy, left, and Emily Woods, right, collect sediment samples from an area near the mouth of the Los Angeles River, in Long Beach on Wednesday, Sept. 19, 2018. The students, along with a L.A. County Dept. of Education educator spent about three hours on the Harbor Breeze Cruises ship The Christopher collecting samples in and around the mouth of the L.A. River in depths from eight to 30 feet. The samples will be tested for heavy metals and for DNA.  (Raul Roa / Staff Photographer)

Photo Gallery Clark Magnet students collect sediment samples from the mouth of the L.A. River for heavy metals testing

Clark Magnet High School Environmental Geographic Information Systems class student Shaye Holladay McCarthy shows a Ghost shrimp collected along with a sediment sample from an area near the mouth of the Los Angeles River, in Long Beach on Wednesday, Sept. 19, 2018. The students, along with a L.A. County Dept. of Education educator spent about three hours on the Harbor Breeze Cruises ship The Christopher collecting samples in and around the mouth of the L.A. River in depths from eight to 30 feet. The samples will be tested for heavy metals and for DNA.  (Raul Roa / Staff Photographer)

Photo Gallery Clark Magnet students collect sediment samples from the mouth of the L.A. River for heavy metals testing

Clark Magnet High School Environmental Geographic Information Systems class student and researcher Shreeja Guntireddy, left, talks with fellow student and sample collector Shaye Holladay McCarthy, right, after collecting sediment samples from an area near the mouth of the Los Angeles River, in Long Beach on Wednesday, Sept. 19, 2018. The students, along with a L.A. County Dept. of Education educator spent about three hours on the Harbor Breeze Cruises ship The Christopher collecting samples in and around the mouth of the L.A. River in depths from eight to 30 feet. The samples will be tested for heavy metals and for DNA.  (Raul Roa / Staff Photographer)

Photo Gallery Clark Magnet students collect sediment samples from the mouth of the L.A. River for heavy metals testing

Clark Magnet High School Environmental Geographic Information Systems class students collected sediment samples from an area near the mouth of the Los Angeles River, in Long Beach on Wednesday, Sept. 19, 2018. The students, along with a L.A. County Dept. of Education educator spent about three hours on the Harbor Breeze Cruises ship The Christopher collecting samples in and around the mouth of the L.A. River in depths from eight to 30 feet. The samples will be tested for heavy metals and for DNA.  (Raul Roa / Staff Photographer)

Photo Gallery Clark Magnet students collect sediment samples from the mouth of the L.A. River for heavy metals testing

Los Angeles County Dept. of Education educator Jim Matthews, left, speaks with Clark Magnet High School Environmental Geographic Information Systems class students while collecting sediment samples from an area near the mouth of the Los Angeles River, in Long Beach on Wednesday, Sept. 19, 2018. The students, along with a L.A. County Dept. of Education educator spent about three hours on the Harbor Breeze Cruises ship The Christopher collecting samples in and around the mouth of the L.A. River in depths from eight to 30 feet. The samples will be tested for heavy metals and for DNA. Matthews coordinated the Marine Science Floating Lab.  (Raul Roa / Staff Photographer)

Photo Gallery Clark Magnet students collect sediment samples from the mouth of the L.A. River for heavy metals testing

Clark Magnet High School Environmental Geographic Information Systems class students collected a ghost shrimp in one of their sediment samples from an area near the mouth of the Los Angeles River, in Long Beach on Wednesday, Sept. 19, 2018. The students, along with a L.A. County Dept. of Education educator spent about three hours on the Harbor Breeze Cruises ship The Christopher collecting samples in and around the mouth of the L.A. River in depths from eight to 30 feet. The samples will be tested for heavy metals and for DNA.  (Raul Roa / Staff Photographer)

Photo Gallery Clark Magnet students collect sediment samples from the mouth of the L.A. River for heavy metals testing

Clark Magnet High School Environmental Geographic Information Systems class student and sample collector Shaye Holladay McCarthy washes the outside of a sample bottle after collecting sediment sample from an area near the mouth of the Los Angeles River, in Long Beach on Wednesday, Sept. 19, 2018. The students, along with a L.A. County Dept. of Education educator spent about three hours on the Harbor Breeze Cruises ship The Christopher collecting samples in and around the mouth of the L.A. River in depths from eight to 30 feet. The samples will be tested for heavy metals and for DNA.  (Raul Roa / Staff Photographer)

Photo Gallery Clark Magnet students collect sediment samples from the mouth of the L.A. River for heavy metals testing

First mate Lon Taulbee, from Harbor Breeze Cruises, assisted Clark Magnet High School Environmental Geographic Information Systems class students collect sediment samples from an area near the mouth of the Los Angeles River, in Long Beach on Wednesday, Sept. 19, 2018. The students, along with a L.A. County Dept. of Education educator spent about three hours on the Harbor Breeze Cruises ship The Christopher collecting samples in and around the mouth of the L.A. River in depths from eight to 30 feet. The samples will be tested for heavy metals and for DNA.  (Raul Roa / Staff Photographer)

Photo Gallery Clark Magnet students collect sediment samples from the mouth of the L.A. River for heavy metals testing

Clark Magnet High School Environmental Geographic Information Systems class student Shaye Holladay McCarthy, shows a tiny crustacean collected in a sediment sample from an area near the mouth of the Los Angeles River, in Long Beach on Wednesday, Sept. 19, 2018. The students, along with a L.A. County Dept. of Education educator spent about three hours on the Harbor Breeze Cruises ship The Christopher collecting samples in and around the mouth of the L.A. River in depths from eight to 30 feet. The samples will be tested for heavy metals and for DNA.  (Raul Roa / Staff Photographer)

Photo Gallery Clark Magnet students collect sediment samples from the mouth of the L.A. River for heavy metals testing

Clark Magnet High School Environmental Geographic Information Systems class students saw harbor seals resting while collecting sediment samples from an area near the mouth of the Los Angeles River, in Long Beach on Wednesday, Sept. 19, 2018. The students, along with a L.A. County Dept. of Education educator spent about three hours on the Harbor Breeze Cruises ship The Christopher collecting samples in and around the mouth of the L.A. River in depths from eight to 30 feet. The samples will be tested for heavy metals and for DNA.  (Raul Roa / Staff Photographer)