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K 11 KJELDSEN Stephen K. Sinnock, P.E. Christopher Hk, P.E. S S I N N O C K NJ N E U O E C K Neal T. Colwell,, P.E P.E. Barry O'Regan, P.E. inn. CIVIL ENGINEERS & LAND SURVEYORS 2414-0010 08-300 May 29, 2020 Mr. Jeffery Wong Jwong_gsj og v.org Senior Registered Environmental Health Specialist Environmental Health Department San Joaquin County 1868 East Hazelton Avenue Stockton, CA 95205 Re: Grindstone Joe's Engineer Plan Check for Wastewater System Design (Holding Tank) Dear Mr. Wong, Thank you for reviewing the Grindstone Joe Association, (Association) wastewater holding tank design submittal package. This letter is in response to your April 28`r', 2020 comments. Your review comments are included below, with our responses indicated in bold italics. Comments from the April 28`h, 2020 letter were as follows: 1. The proposed location of the tank is about 67 feet from waterway based on the scaled diagram on Sheet CS001 and also off Google Map. Minimum setback requirement for tank to waterways is 100 feet according to Table 1.5 of Section 1.5 of the San Joaquin County Onsite Waste Treatment System (OWTS) Standards. The tank does not meet this setback. The proposed tank location meets the 50 foot setback based on "Existing, Non -Conforming OWTS" identified in Table 1. S of SJC OWTS Standards. These setbacks are allowable for sites that cannot meet Tier I requirements. The site is an existing lot, and the physical location of the site does not allow for 100 foot setbacks from all waterways. Per Section 6 of the SJC EHD Onsite Wastewater Treatment Systems Local Agency Management Program, a variance is allowed for old lots of record when they cannot meet the Tier 1 requirements. Furthermore, it is our opinion that the reduced setback should be allowed based on the fact that the proposed system is a holding tank system, not a treatment system, which will eliminate the potential impact to nearby waterbodies. 2. In Water System Calculation (2414-0010, dated 10/18/2019) included in the Plan, KSN estimated: • Peak Day Use of 85 attendees/day, • Overnight Water Use of 40 gallons/capita/day, • Camp Day Use of 20 gallons/capita/day; • However, in the capacity calculation section which is used to justify the 5,000 -gallon holding tank, KSN listed: • 320 gallons for Average day demand • 531 gallons for Peak Day Demand, and 3,750 gallons 7x Peak Week Demand • Using Average camp day use of 20 gallons/day at peak 85 attendees/day, that would work out to 1,700 gallons/ (or 3,400 gallons/day at Peak Day Use), and in a week, that demand would be 11,900 gallons, in contrast to the 3,750 gallons listed by KSN. Please provide further clarification to the calculations and numbers. Corporate Office: 711 N Pershing Avenue I Stockton. CA 95203 1 209-946-0268 1 vNm.ksninc.com West Sacramento: 1550 Harbor Boulevard, Suite 212 1 West Sacramento CA 95691 916-403-5900