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K Grindstone Joe Association S Plan Check Review Comments NSan Joaquin County U-C. May 29, 2020 Page 2 of 3 Please see attached, revised, calculations. Occupancy totals have been confirmed to be consistent with the previously provided site Usage Schedule as submitted with our April 3, 2019 response to the CO0048503. Included in the calculations are typical event and event occupancy calendars, and attendee data based on 2019 calendar year. Key points of clarification here are: 1) The peak day event is a short duration, low frequency, event. Peak Day occupancy occurs approximately once per year for an annual event that is estimated to occur for approximately 6 hours, with water usage estimated at 20 gaUcapita/day, adjusted to the 6 -hour time period. This equates to 425 gallons of wastewater produced for the event. The wastewater generated from this event is not used for as the basis of holding tank capacity calculations. 2) Holding tank capacity is based on peak weekflows. Peak week calculations are based on weeks when member events take place. Daily occupancy was calculated by taking the maximum occupancy of any consecutive 7 -day period and dividing this by 7 days to find the equivalent daily occupancy. 3) Overnight water usage is expected to be higher than daytime water usage to account for use of toilets and showers, however because most members have their own facilities on their boats, overnight usage is assumed to be 25% of the total daily flow. KSN proposed a 5,000 -gallon holding tank. Section 10.4 of the OWTS Standards requires: The liquid holding capacity shall be a minimum of seven (7) days of peak wastewater flow generation with a one -hundred (100) percent reserve capacity. Even if EHD accepts the 3,750 gallons for 7x Peak Week Demand (see above Item # 1), the proposed 5,000 gallons capacity does not meet the required 7 -day flow plus 100% reserve, which would be 7,500 gallons. Please provide additional information or revision that will meet this requirement. Please see revised calculations. Peak week flows require a capacity of 2275 gallons. With a reserve capacity of 100% the total required tank volume is 4550 gallons. In the unlikely case that the peak day flow occurred concurrently with the peak week flow this would add an additional 425 gallons, for a total of 4975 gallons, still within the 5000 -gallon tank capacity. 4. The Service Agreement with Advanced Septic Service, LLC dated October 31, 2019 scheduled pumping frequency quarterly (April 1, June 1, August 1, October 1). However, the Plan cited 13 days between "Time to Pump" Pumping Events (see KSN Water System Calculation). Under Section 10.5: The system must be operated to prevent sewage overflow from the system at all times. And Section 10.8.5 The pumping frequency required to maintain the system at a level below the alarm set point Please provide additional information and relevant document that will meet these requirements. Pumping will be provided on a quarterly basis at minimum. The hauling contract has been revised to include a clause that allows for pumping to occur on an as -needed basis when Association Staff call for service. Please see attached 5. Cut -sheet for the proposed alarm (Orenco 120 VAC Liquid Level Alarm Panels) has been provided, but there is no discussion how the alarm is to be set up. Section 10.5 of OWTS Standards requires: Both Audible and visual alarms are required 10.5.1 The alarms must be set to signal at the "time -to -pump "and "exceeding reserve storage volume " levels 10.5.2 The audible and visual alarms must be located in an area 6that can be readily seen and heard, with battery power where electrical power is not available.