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Thatcher Company of California, Inc., Stockton Sample #(s): TCS-07 Primary Sampler Assistant sampler Date and Approx. Time Collected: Dylan Clark Bonny Lew 11/28/2018, 4:20 prn Photographer Documenter Other sampling assists Bonny Lew Anne Ekker Xiaomei Ma Primary Sampler: ® Inner Gloves ® Outer Gloves ® Suit Kleenquard ❑ Respirator type Level D Sample Container Used: Glass Jars: 16-ounce jar Other sample container used: N/A ❑ Co-located sample(s) collected for facility Sample device used: ❑ Plastic Scoops ® COLIWASA ❑ Pond Skimmer ❑ Gloved hand ❑ Direct pour into sample container ❑ Other sample devices used (specify): Sample location description: The sample was collected from a 330-gallon tote stored in the Empty Tote Storage Area near the Cooling Towers. This area is along the eastern perimeter of the facility, approximately midway between the south and north facility perimeters. GPS Coordinates of sample location: longitude: -121.261693; latitude: 37.908854 (see Attachment 1, Sample Location Map). Sample Information/Field Observations: In the tote, looking at the solution from the top, the solution was gray with foamy, tan spots around the top. In the sample jar, the liquid was much lighter-colored and slightly cloudy, with the gray film and tan spots on the top. The tote was a white, plastic 330-gallon container. Although it was stored in the Empty Tote Storage Area, the tote was not empty; it was almost half full of the solution. A label on the tote said, "PLS i do not use, for B gas only'. Reynon stated that the solution was a caustic for the bi-gas tank, however, he did not know if it was solution slated to go to, or from, the bi-gas tank. The.tote also had a UN sticker on it with the UN number 1824 (for sodium hydroxide). Reynon stated that this liquid would be shipped to the Sparks, Nevada location to be used as an ingredient in a product made at that location. Field Observations: The tote was approximately half full, however, it was stored with other empty and out- of-service totes. Field testing and other pertinent info: a pH strip used to measure the water showed a pH of approximately 14. This tote was found near the 5 gallon buckets that contained strong acidic waste collected as sample TCS-06. Analysis for sample location: ❑ total metals ❑ soluble metals ❑ TCLP ❑ mercury ❑ Chrom 6 ❑ PCBs ® pH ❑ flash pt ® fish bioassay ❑ asbestos ❑ motor oil range ❑ diesel range ❑ total petroleum hydrocarbons ❑ VOCs ❑ Semivol ❑ < 100 micron size ❑ other (specify): Photos: See Attachment 4, Photo #'s: 36-42 Page 9 of 12