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From: WESLEY DONOHO To: Wona.Jeff rEHDI Subject: Re: 29700 Ahern Engineered OWTS for Apna Petroleum SR0085076(PA-1600049) Date: Wednesday,June 1,2022 11:33:00 AM Attachments: 200924-Revised Daily Use(2).docx NCS-6.pdf NDA-ATX-1.)d CAUTION:This email is originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe. Jeff: I have attached the document I was given for the loading on this system. I was told this had been approved so I didn't question it. I also checked on the usage of a truck stop in Bakerfield that had a system designed for a similar load and they told me their average daily use was about 3,500 gallons and they have Washers and Showers in their facility. I have also attached the design manual from Orenco that I used to design the system from. It is where all of the figures for my calculations came from. It is a pretty comprehensive document and covers many scenarios. I designed the system to reduce the Nitrates to a point that with ground treatment in the trenches I felt the effective Nitrate load would not be greater than 10 mg/L. I have resubmitted the information to Orenco to see what their calculations will show. I will forward their response to you once I receive it. I have also attached a case study of a system using the AX-100 pod to achieve discharge limits. If you have any more questions or comments, please let me know. Thank you and have a great day, Paul Donoho On Wednesday, May 25, 2022, 04:54:30 PM PDT, Wong,Jeff[EHD] <jwong@sjgov.org>wrote: Paul: Per our phone conversation, please provide additional information for the 2/28/2022 engineered OWTS stamped by Ross Shoaf(the Plan): 1) The numbers used to calculate the estimated maximum daily load, 6,450 gallons/day(and average of 3,225 gpd) , is different from the 7,095 gpd (derived from 845 gpd (employee) + 6,250 gpd (facility)) used in the Nitrate Loading Calculation in the NLS/SSS dated 3/4/2020 (Project No.1947) prepared by Live Oak Geo Environmental, Inc. The EHD 1/7/2021 Condition of Approval letter for the Use Permit application PA-1600049, Item#4, requires the OWTS be based on the findings of the NLS/SSS. Please provide information/sources in support of the different parameters being used to design the OWTS. 2) Many numbers used in the calculations on Page 5 of the Plan haves no legend or explaination.