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Complaint Investigation Summary Report*5105 COMPLAINT ID: CONANPCJL Site Location: 6966 S INLAND DR Activity Summary Activity Date Recorded by 08/24/2020 Complaint discussion with J. Alaniz, per prior discussion with M. Naidu, program MANZO coordinator, fish bio assay testing would be acceptable to determine if residual contamination is hazardous or not and whether it can be left in place. 08/25/2020 Received an email from Hayden Lee <haydenlee@whfinc.com>, saying: ALANIZ Please see the forwarded email from GeoAnalytical Laboratories regarding the storage and preparation of the Trinitas soil samples to be sent out for a fish bioassay, as we discussed over the phone. We are compositing samples S-2, S-3, S-4, and S-4@2 into one sample for the bioassay, because these samples had the highest levels of mineral oil present. We anticipate having results within 2-3 weeks. I will notify your office immediately once the results are sent to me, and we can determine the next course of action. Hayden informed me that the samples initially taken were still acceptable for the fish assay test. The EHD did not witness the sampling as there were other ER events going on at that time. 08/31/2020 Sent the following update email to Isabella Bencomo (Water Board) ALANIZ <isabelIa.ben como@waterboards.ca.gov>: The responsible party wants to leave the spill in place. The EHD reviewed the SDS sheets and the testing done so far and found a concern with fish toxicity. The responsible party decided to test the contaminated soil for toxicity using the fish bioassay test. They are going to be using the most contaminated parts for the testing. If the sample passes the test, then the EHD will have no other concern and will not require any remediation. If you have any concern regarding this, please let me know. I have not received the results yet. 09/21/2020 Received the fish bioassay results from Hayden Lee <haydenlee@whfinc.com>. ALANIZ The results indicated the soil was not hazardous for aquatic toxicity. Called Hayden to let him know that the results were acceptable. A full report is going to be delivered to the office later this week. 10/02/2020 Received the final report from Hayden Lee <haydenlee@whfinc.com> on 9/28/2020. ALANIZ Sent him an email that the complaint was going to be abated. The responsible party, Thomas Robinson <thomas.robinson@trinitasfarming.com>, was cc'd in the email. Gathered the complaint documents together and gave it to Elena Manzo, REHS, for review. Hayden recommended that the spill be left in place as the"analytical results showed all tested analytes to be non-detect(ND)for all soil samples except for mineral oil." In addition the fish bioassay had a"100% survival rate at the 750 mg/L test range." 10/02/2020 Called Jana Labrucherie, <jlabrucherie@sjgov.org>, 209-636-8041, and let her kno\A ALANIZ that the complaint was resolved for the county. Jana asked for a copy of the report. 10/15/2020 Received an email from Jana Labrucherie, <jlabrucherie@sjgov.org>, asking about ALANIZ the report. Sent her an email saying it was in the process of being reviewed. 5105.rpt Page 5 of 7