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KLEINFELDER SOIL SUITABILITY AND NITRATE LOADING STUDY MICKE GROVE PARK EXPANSION r SAN JOAQUIN COUNTY, CALIFORNIA 1. GENERAL Kleinfelder is pleased to present the results of our soil suitability and nitrate loading study for the proposed Micke Grove Park Expansion project in San Joaquin County, California. The Assessor's Parcel Number of the property is 059-100-02. 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 f 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 / PROPOSED DEVELOPMENT At the time of our study, the existing development at the 208.53-acre Micke Grove Park site included an approximate 130-acre golf course, a zoo, picnic areas, museums, and various other recreational areas. Future development is proposed on approximately 47 acres of property located at the north side of the park. This area consisted of a relatively-flat field covered with dense weed growth and scattered trees. The proposed development includes the construction of a lake, a fountain, picnic areas, an access road, a public restroom, and various other improvements. The proposed expansion area was bound to the north by Armstrong Road, to the east by Micke Grove Road, to the west by railroad tracks, and to the south by the existing Micke Grove Park. The existing parcel is zoned P-F. We understand that an on-site septic/leach field system will provide sewage disposal for the public restroom constructed on the expansion property. We anticipate that an existing well will provide water for the restroom. A map showing the approximate locations of the proposed new restroom, septic/leach field, and well is presented on Plate 2. We understand that the largest proposed large picnic area will have a seating capacity of approximately 200 to 250 people, and various subsidiary picnic areas will have capacities of approximately 100 to 150 people. For the purpose of our evaluation a r 71071.G01/ST06R641 June 15,2006 Copyright 2006 Kleinfelder,Inc. Page 1 of 8