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k'q KLEINFELDER each of proposed residential lots, however, no electrical service has been provided. We anticipate that the predominant use of groundwater at the residences will be for domestic and landscaping purposes. At the time our original soil suitability study, the only well existing near lots 1 , 8, and 9 was a newly drilled and not functioning well on lot 17. Samples of groundwater were not tested at that time. We do not know of groundwater contamination issues at the project site at this time. No underground storage tanks are known to exist on the site and no gas stations are located adjacent to the site. The potential sources of nitrate in the project area include the grazing of cattle and horses; existing septic systems for single-family housing located in the project area; and any fertilizers, pesticides, and herbicides that may be used for agricultural purposes in the area. After the parcels are developed, we anticipate that the on-site sources of nitrate will include the septic systems, lawn fertilizers, and potentially horses grazing on the parcels. 5. SOIL PROFILE The subsurface conditions at the three parcels were explored on August 9, 2005 by Chesney Consulting. The soil conditions for these three lots are described in Appendix A. The Soil Survey of San Joaquin County, California published by the U.S. Department of Agriculture, Soil Conservation Service (1992) refers to the near-surface soil within the project area as belonging to the Exeter soil series (Map Symbol 157). This soil is described as having "severe" percolation characteristics for septic tank absorption due to slow percolation and cemented pan. Other attributes are given in the table below.- Map elow:Map Available Water Organic Symbol Soil Name Capacity, inches/inch pH Content, percent 157 Exeter 0.10 - 0.17 6.1 — 7.8 0 — 1 6. PERCOLATION TESTING Shallow and deep percolation test holes were installed at the three lots on August 9, 2005 as described in Appendix A. The approximate percolation test locations are presented on Plate 1 and Appendix A. Following drilling, the sides of the holes were scored, and significant loose material was removed from the bottom of the holes. Test holes were prepared in accordance with SJCEHD criteria. Approximately 2 inches of pea gravel was placed at the bottom of each test hole. The results and original test forms are included in Appendix A. 57556.G01/ST05R687R August 25,2005 0 2005 Kleinfelder, Inc. Page 3 of 5