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■■ V <br /> MEMORANDUM RECEIVED <br /> R FESS/p � <br /> OCT P, 2 2019 <br /> To: Linda Turkatte, REHS <br /> ENVIR(--i� . �,tl ;—L r;EALTH " N �; I <br /> From: Paul Schneider, P.E. PERMIT/SERVICES \ Exp. 9/30 2 ; <br /> s CN IL a�Q <br /> Date: 10/1/2019 �gTFOF CAS\F�� <br /> Re: Response to Plan Check Comments and Alternate Nitrate Loading Analysis Holly <br /> Commerce Center Buildings A&B <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. 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 /> 7 on sheet C7.3 as well as note#7 on sheet C5.0. <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 loading docks because if the building use <br /> were to change to office and demand this large a septic system the loading docks would no longer be <br /> necessary, and the truck courts would be converted to auto parking. <br /> III. 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 /> Attachment 1. The site is designed with a detention and water quality basin that serves a dual purpose. <br /> The basin is designed to attenuate large storm events so that Sugar Cut is not impacted while also <br /> capturing and treating the 85th percentile storm event with a total annual capture of least 80%. For the <br /> sake of the following analysis that is intended to replace the nitrate loading calculation found at the <br /> bottom of Page 8 of the Chesney Report Dated May 6, 2019. <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 /> F:\17projects\17017 Holly Sugar Ind ustria l\Civil\Septic Sizing-Prelim\17017 Holly Commerce Center A&B Nitrate Loading Memo <br /> Ver 1.docx <br />