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1 <br /> Soil Suitability/Nitrate Loading Study Addendum Letter <br /> Lange Twins Winery , Acampo, California Irerracon <br /> May 21, 2019 Terracon Project No. NA197005 <br /> Terracon reviewed the EHD online permits for the site address of 1525 E. Jahant Road. A <br /> percolation test permit (SR0043327), liquid waste permit (SR0045991)dated 2006 were available <br /> for the initial septic system installation including the three existing leach lines with three seepage <br /> pits. A building permit (BP-1100519) was available for the trucker south restroom. Based on a <br /> review of well permit SR0044120/ SR0044121 dated 2005, a soil boring log was available for the <br /> existing onsite well located on the southern portion of the site. Based on a review of the boring <br /> log, onsite soils consist of stratified layers of sand, gravel and/or clay to depths of 725 feet bgs <br /> Additional soil boring and well permits were available for the address. There were no repair <br /> permits found for the address. Copies of the facility permit history is included in the Attachments. <br /> Based on interviews with Mr. Lange, in general, the facility operates a standard 5 or 8 hour single <br /> shift work day for approximately 8 to 11 months of the year. During the peak season which <br /> comprises approximately 3 months of year,portions of the facility will operate between 10 to 24 <br /> hours per day depending on the building usage and time of year. Mr. Lange indicated the facility <br /> is open daily for wine tasting between 12pm and 5pm with an average of 15 visitors each day. <br /> The facility has approximately five special events per year. Mr. Lange indicated each special <br /> event has 200 visitors per day. <br /> In accordance with the San Joaquin County Onsite Wastewater Treatment System Standards <br /> (OWTS)dated January 2017, Table 6.6-Water Use Computation table,the following average daily <br /> flow rates have been selected to calculate the wastewater flows for the facility: <br /> e) Bars or cocktail lounges 20 gallons per person (similar to a wine tasting customer) <br /> o) Day workers at schools or offices 30 gallons per shift (similar to an office employee) <br /> r) Industrial building with no food cafeteria 15 gallons per person (similar to a warehouse <br /> employee) <br /> x) Airports, per person (similar to a truck driver) <br /> To estimate the wastewater flow for the facility, Terracon considered the standard and peak <br /> operational hours, shifts, number days of operation per year, number of employees, number of <br /> visitors, and special events. The maximum (max)daily flow rate and average daily flow rate were <br /> calculated for each building. Refer to the Attachments, Table 2 for flow rates per building. <br /> Maximum Daily Flow Rates (# People per day x# Effluent gpd) <br /> The max daily flow rate for the existing facility during standard operating hours is 642.50 gpd. <br /> During peak hours, the max daily flow rate for the existing facility is 1,651.88 gpd. The proposed <br /> development (future tasting room stand alone restroom and future administration building) are <br /> anticipated to add an additional 581.25 gpd during standard operating hours or 750 gpd during <br /> peak hours for a total of up to 2,401.88 gpd during peak hours. The special events are anticipated <br /> to add an additional 4,000 gpd (200 people x 20 gpd). Therefore, the maximum daily flow for the <br /> facility is anticipated to be 6,401.88 gpd during peak hours five times per year when a special <br /> event occurs. <br /> Responsive ■ Resourceful ■ Reliable: 5 <br />