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u F ODUCTION nsulting has been retained by Aqua Pool & Spa Company to complete the s as specified by the San Joaquin County Environmental Health Department (EHD)orteevelopment of their new facility in Manteca, California. It is our understanding the subject property formerly contained a single family residence with an on-site domestic well, septic system and several large trees. The site has been graded according to an original specification, which now has been dramatically changed. The Environmental Health Department has been at the forefront of nitrate impact investigations and the prevention or mitigation of environmental contamination from various sources of nitrate, particularly septic systems. EHD requires these investigations and corresponding septic system design criteria under Community Development Title 9-1105.2 (d) for projects in unsewered areas, in areas currently impacted with nitrate, or for projects that may potentially impact the underlying groundwater with nitrate. Aqua Pool & Spa intends to operate the subject property as a Commercial Center consisting of seven different types of businesses in three Buildings denoted as Building "A," Building "B" and Building "C." Building "D" is proposed to be the Aqua Pool & Spa Construction Office with a surrounding storage yard. Workers will come into this building to pick up tools, equipment, construction materials, etc. Calculated wastewater flow volumes originating from the Commercial Center and Construction Office are based upon the approximate average of all flow determination methods as typically required by EHD. The Environmental Health Department's main concerns and requirements for this project are 1.) The current environmental condition of the soil and groundwater under the proposed wastewater disposal area and the nitrate impact from either previous on-site generation or surrounding agricultural inputs, 2.) Specifying mitigation measures to prevent future nitrate impact to the underlying groundwater, 3.) Assurance that sufficient wastewater disposal area exists to accommodate the anticipated wastewater flow volumes, 4.) Assurance that there is sufficient replacement areas that will remain designated as such, in the event of system failure, or a need to "rest" the primary disposal area, and 5.) Wastewater flow volumes have been projected and will be monitored with a flowmeter so that the average daily flow(ADF) of 2,500 gallons is not exceeded. In addition, EHD may require the primary filter bed to operate under a yearly permit, with observational and analytical monitoring to occur at designated intervals. The findings of this study reveal there has been nitrate impact to the groundwater under the proposed wastewater disposal area. Therefore, advanced wastewater treatment to mitigate and prevent future nitrate impact by using a MicroSepTec® Wastewater Treatment System is warranted. Secondly, a filter bed system has been designed to dispose of a maximum of 2,500 gallons per day (gpd) of wastewater effluent. Approximately 3,600 square feet have been dedicated for primary disposal area future and approximately 3,500 square feet have been dedicated for 100%replacement area. de . Page -1- Ckemey Consulting