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SAN �JQAQUIN Environmental Health Department � Complaint Record Daily Time and Activity Summary from 1/1/2015 to 1/1/2025 for COVEZDHGC located at 18045 Kelso Rd. Mountain House, CA Activity Date Recorded by 03/19/2018 3:30am-5:00pm PE 2546 SAEED 90 min I received email today from the operation manager, Mike Buckley stating" When SC 544 arrived at the plant this morning we noticed that a filter housing was leaking diesel fuel onto the ground near out diesel storage tank. It looks like the housing has a crack near the top of the housing. We estimate approximately 50 gallons spilled onto the ground and into the storm drain. The diesel that spilled into the storm drain only went down two manholes and stopped so it didn't go into our on site storm drain holding pond. Were working on getting a temporary EPA ID number and a contractor to clean the storm drain and remove the contaminated soil. Let me know if you have a form I need to fill out." I discussed this email with me. Aaron Hang was on "C" and Muni told me to give it to Aaron. I paged and called Aaron. Aaron told me that he is already at this site. Since I was on the"D" ER scheduled, I left the office at 3:10pm to relieve Aaron. I arrived on site at 4:00pm. I discussed the incident and cleanup with Aaron and Mike. Clean Harbor first crew were on site to excavate the contaminated soil, and waiting for a pump truck/hydro jet to pressure wash the storm drains. Soil excavation around the tank started 4:20pm Narrative cont'd with OT. see next entry. 03/19/2018 5pm-11:30pm PE 2546 SAEED 390 min Soil excavation around the tank started 4:20pm and finished at 5:30pm. Concrete SC 944 under the Diesel tank was wiped out and pressure washed. Five 55 gallons drums of contaminated soil were generated from this initial cleanup . Pump truck arrived on site at 5:35pm. The crew started pressure washing the storm drains from start to end. Red dye diesel contaminated with water observed along the storm drains. Hammid Parsa with Mountain House Community Service District arrived on site around 6:00pm and discussed the cleanup plan. Pressure washing continued until the red dye color disappear at the end of the lin. Sheen on the water surface remained inside some storm drains. Red dye diesel started to show up again along the storm drains. More adjacent storm drains were opened, and pressured washed. At 9:30am, the crew and the facility decided to finish up the initial rinse today, and come back tomorrow to rinse one more time. I discussed that it will rain tomorrow. Jim Ready or storm drains covers with Clean Harbor told me they will be here around 9am. I discussed placing pads around the storm drain in case it rains before they start the cleanup. The drums and the totes were labeled and I took photos. All the waste will be left on site until the waste profile is created. I took photos of the labels. A total of 12 totes ( 275 gallon each) of contaminated water were generated . Since the crew did not have more totes, approximately 800 gallons remained inside the pump truck tank. The flow did not contaminated the retention pond at the end of the line. I left the site at 11:34pm and arrived home at 11:28pm. Page 1 of 4