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Complaint Investigation Summary Report #: 5105 COMPLAINT ID: COPFPNNPH Site Location: 725 W ANDERSON ST, STOCKTON CA 95206 Activity Summary Activity Date Recorded by 07/08/2022 Sent a reply to Richard Stiffler informing him that all reports are online at EHDs ALANIZ webiste. Called Scott Moss, Ponder, and informed him that the Waterboard would be making the final decisions on cleanup and waste as the EHD was referring the cleanup to them. 07/18/2022 Reviewed soil and vegetation waste results received from Ponder Environmental with Garrett B. Samples were sent to McCampbell Analytical Inc. The soil and vegetation were tested for CAM 17, TPH G,D,MO, PCB's and Fish Bioassay on the vegetation. The fish bioassay test found the vegetation to be non-hazardous. The soil had the following results: TPH-Gasoline= 54mg/kg TPH-Diesel= 17,000mg/kg -TPH-Motor Oil= 4,300mg/kg The vegetation had the following results: TPH-Gasoline= 220mg/kg TPH-Diesel= 31,000mg/kg -TPH-Motor Oil= 10,000mg/kg 07/25/2022 UPDATE: Received an email from Richard Stiffler, City of Stockton, on 7/20/22 informing us that there appeared to be new oily residue in the storm line on Anderson St. near Pershing Ave. Per Richard, Ponder Environmental would be cleaning said storm line on 7/20/22. Richard also stated that there was evidence of vehicle oil changes occurring along Anderson St. Empty oil containers were observed by the City of Stockton along Anderson St. Photos were provided in the email. Called Richard to gather more information as to what the City of Stockton was planning on doing to assess this issue. Left a voice mail for Richard Stiffler. Called Vince Blackwood (916-257-5194) with Apex Envirotech to see what time they were estimating their first sample would be collected tomorrow 7/26/22. Vince informed me that they would be on site at 7am but he didn't forsee samples being collected before 8am. I informed him that I would be there to witness sampling. GARCIA-MEJIA GARCIA-MEJIA 07/26/2022 On site to witness soil sampling by Apex Environmental. GARCIA-MEJIA People on site: Vince Blackwood, Apex -Scott Moss, Ponder Environmental Robert Chedsey, Fish and Wildlife -Brian Toledo, City of Stockton Soil samples were collected every 100feet starting at 600 feet away from the ditch drain. 2 soil samples, on the East and West end of the ditch were collected at every 100 foot point. The last two samples were collected at 170 feet, 30 feet from the 200 foot mark. 12 soil samples were collected in total. Per the waterboards request water samples were also collected even though they were not included in the original soil sampling plan. Water sample was collected at the 300 foot mark. Two 1 liter bottles and 6 40mL vials of water were collected. Samples will be taken to Sparger Technology and the same tests will be run for both the soil and water. 07/26/2022 Saved photos to the public drive. Created photo log and printed it to keep with file. GARCIA-MEJIA 51 05 rpt Page 4 of 10