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K L E I N F E L D E R SOIL SUITABILITY AND NITRATE LOADING STUDY GOODLAND LANDSCAPE CONSTRUCTION 21080 MOUNTAIN HOUSE PARKWAY SAN JOAQUIN COUNTY, CALIFORNIA 1. GENERAL Kleinfelder is pleased to present the results of our soil suitability and nitrate loading study for the Goodland Landscape Construction office building located in San Joaquin County, California. The Assessor's Parcel Number of the property is 209-150-26.''An\ aerial photograph showing the approximate site boundaries is presented on Plate 1. ,- The purpose of our study was to determine the suitability of the property for septic tank usage. The study was performed in general accordance to the requirements of Section 9-10100© of San Joaquin County Ordinance. The following sections include background information regarding the project site and the proposed development, past and present uses of the site, existing septic tank performance and permitting, and the groundwater conditions in the project area. In addition, discussions regarding our investigative procedures and the site conditions encountered during our field exploration are included. Finally, the results of our percolation tests, nitrate loading calculations, and subsequent conclusions are presented. 2. SITE DESCRIPTION At the time of our study, the subje1.55-a re parcel contained a residence that will be converted into an office. Propos dev lopment of the site includes an asphalt driveway and parking area and a 2,500 square foot shop building. The entire site was approximately 10 feet lower in elevation than the road to the west. The property was bound to the north and east by agricultural farmland, to the south by a pasture for cattle grazing and dairy, and to the west by Mountain House Parkway. The existing parcel is zoned AG-40 (General Agricultural). A septic/leach field system is located behind and east of the building; the exact location is unknown to us. A well is located near the southwest corner of the building. We understand that the structure will be used as office space for approximately 5 employees daily. The remainder of the site will be used for vehicle parking and equipment storage. According to the San Joaquin County Onsite Wastewater Disposal Standards (page 13 of 25), day workers at offices should be considered to have a water use of 30 gallons per shift per day. For the purpose of our nitrate loading calculation, we have estimated the average waste/sewage flow per week for the project site as follows assuming 1 eight hour shift per day and a 5 day work week: ,�5 pe le per da x 0 gal er pers x 5 days 750gal/week 86892.G01/ST07R953 November 21,2007 0 2007 Kleinfelder Page 1 of 7