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■ <br /> NE SIEGFRIED <br /> MEMORANDUM <br /> To: Michael Kith, REHS <br /> From: Paul Schneider, P.E. <br /> Date: 11/6/2020 <br /> Re: Response to Plan Check Comments and Alternate Nitrate Loading Analysis Holly <br /> Commerce Center Buildings E&E <br /> I. Introduction <br /> Siegfried is in receipt of the memorandum prepared by Norman Hantzsche, P.E. or Questa Engineering <br /> Corporation dated August 15, 2019. In addition, we have been provided the attached "Attachment 1; <br /> Recommended Alternate Nitrate Loading Analysis for Heavily Developed/Impervious Site Conditions" It is <br /> further understood that there is an overriding regarding the potential that the site could change from dry <br /> warehouse to some other more intense use. The following sections are intended to augment the revised <br /> plans and serve as our response to the comments. <br /> II. Sewer Collection System Design <br /> The plan review comments indicated that there was a concern regarding the gravity collection system. <br /> The system design was a cost driven decision and a closer analysis was performed to compare the <br /> gravity system to a force main system that alleviates the concerns raised in the comments. Due to <br /> favorable results and the concerns raised, the design has been revised to a force main system that is not <br /> as deep and out of the groundwater. Gravity structures have also been removed. Lastly, the filter bed <br /> rock depth has been corrected as noted. <br /> III. Future Growth and Monitoring Plan <br /> As requested, the plans have been altered to include a flow monitor and sensor on the post septic tank lift <br /> station that lifts the effluent into the leach field. The project owner has volunteered to enter into the <br /> County's monitoring program and will report the waste flows as required. Please see note added to detail <br /> 2 on sheet C7.3. <br /> To address the building use change potential, Siegfried has prepared and attached an exhibit that utilizes <br /> the architectural occupancy rates on the current plans and designates a contingency area for leach fields. <br /> Please note that the areas are currently shown to be in the trailer parking because if the building use <br /> were to change to office and demand this large a septic system, a portion of the trailer parking would no <br /> longer be necessary, and a portion of the loading docks would be converted to auto parking. <br /> IV. Alternate Nitrate Loading Analysis <br /> It is understood that there is concern over the impact of large amounts of impervious area on the <br /> historical Hantzsche-Finnemore equation and an alternate method was requested in the form of <br /> Stockton San Jose Sacramento Modesto <br /> 3428 Brookside Rd. 111 N. Market St.,#300 900 Howe Ave.,#200 100 Sycamore Ave,#100 <br /> Stockton, CA 95219 San Jose, CA 95113 Sacramento,CA 95825 Modesto, CA 95354 <br /> t:209.943.2021 t:408.754.2021 t:916.520.2777 t:209.762.3580 <br /> FM 7projects\17017 Holly Sugar Industrial\Civil\Septic Sizing-Prelim\17017 Holly Commerce Center E&E Nitrate Loading Memo <br /> Ver 3.docx <br />