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r � ■�■ SIEGFRIED MEMORANDUM To: Linda Turkatte, REHS From: Paul Schneider, P.E. Date: 8/15/2019 Re: Sanitary Sewer Design Parameters (Dry Storage Warehouse) Holly Commerce Center I. Introduction In this memo, we refer to the San Joaquin County Onsite Wastewater Disposal Standards dated January 2017 (County Disposal Standards), the 2016 California Plumbing Code (CPC), and the EPA Design Manual for Onsite Wastewater Treatment and Disposal Systems. In the June 14, 2019 submittal for a series of buildings at the Holly Commerce Center the waste disposal system was sized using a combination of the County Waste Disposal Standards and a waste flow rate derived from the number of fixtures and the daily uses of said fixtures. It is our understanding that this method is likely not acceptable, and we seek to establish a waste disposal rate as well as establish the acceptable employee count for the dry warehouse use. To avoid confusion between fire and life safety occupancy established by the project architect for exiting, California currently uses the 2016 CBC (California Building Code) to determine the number of occupants for building exiting requirements. The CBC says that we are to allow one occupant for every 100 square feet of office space and one occupant for every 500 feet of warehouse space. This occupancy differs from the Plumbing Code as outlines below. II. Employee and Fixture Count Determination Employee counts and minimum fixtures are to be calculated based upon the CPC Chapter 4. Specifically, the Table A: Occupant Load Factor shall be coupled with Table 422.1 Minimum Plumbing Facilities and the building square footage as represented on the architectural plans and the building permit. As an example, a 925,000sf warehouse building with 10,000sf of office space would have an employee count as follows: Per CPC Table A Group S Warehouse, the ratio is 1 employee per 5,000sf, and the Group B Office ratio is 1 employee per 200sf, yielding an employee count of 233 (183 + 50). Minimum fixtures would then be per Table 422.1 based on 233 employees split equally between men's and women's facilities per CPC. Stockton San Jose Sacramento Modesto 3428 Brookside Rd. 111 N. Market St.,#300 109 Scripps Drive 100 Sycamore Ave,#100 Stockton, CA 95219 San Jose, CA 95113 Sacramento, CA 95825 Modesto, CA 95354 t: 209.943.2021 t:408.754.2021 t: 916.520.2777 t: 209.762.3580 F:\17projects\17017 Holly Sugar Industrial\Civil\Septic Sizing-Prelim\17017 Holly Commerce Center Septic Basis of Design Memo Ver 1.docx