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FCncto ODUCTION nsulting has been retained by Paul Bottini and Peggy DeForest of Cunha Draying, lete the requirements of the San Joaquin County Environmental Health Department e development of their new facility in Lathrop, California. 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. Mr. Bottini and Ms. DeForest intend to operate the subject property as a small Business Park commercial facility to consist of three Buildings denoted as: Phase One Building "A," (11,000 sq. ft.), Phase Two Building "B," (19,250 sq. ft.) and Phase Three Building "C," (19,250 sq. ft.). Presently, the Copper& Brass Company, Inc. has a lease agreement to occupy a portion of the new facility. Anticipated wastewater flow volumes originating from the Business Park were originally based upon the approximate average of all flow determination methods typically required by EHD. However, in discussions with EHD staff,these calculated flow volumes exceed those typically observed from a comparable facility. Since the effluent will be pumped to a filter bed disposal arrangement, wastewater flow volumes will be quantified with a flowmeter to verify flow volumes in comparison with the other facility. 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 Environmental Health Department's main concerns and requirements for this project are 1.) The current environmental status 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 from effluent emanating from the proposed project, 3.) Assurance that sufficient wastewater disposal area exists to accommodate the anticipated wastewater flow volumes, 4.)Assurance that there is sufficient replacement area that will remain designated as such, in the event of system failure, or a need to "rest" the primary disposal area, and 5.) Siting the disposal area outside of a Pacific Gas &Electric (PG&E) Easement area as denoted on the Site Plans,produced by Schack& Company of Tracy. The findings of this study reveal there has been low nitrate impact to the groundwater under the proposed wastewater disposal area. A filter bed system has been designed to dispose of a maximum of 1,000 gallons per d d of w . As referenced above, in accordance wi EHD recommendations, realistic wastewater flow volumes from a comparable facility have been used in the calculations for this proposed project. A 1,600 square foot filter bed has been dedicated as a primary disposal area and 1,600 square feet have been dedicated for 100% replacement area. Given the existing land area of the project,these areas can be easily increased. Page -1- Chawy Cowulting