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KLEINFELDER As stated previously, the residence is connected to the public water supply. We understand that nitrate and DBCP testing is not required for this project. We understand that the on-site agricultural well is not currently used. Therefore, groundwater is not being used on the site. We understand that the well will be used as a fire department supply well. We do not know of groundwater contamination issues at the site at this time. There are no on- site underground storage tanks or adjacent dairies. The potential exists for groundwater to be contaminated through the use of pesticides and herbicides on nearby agricultural fields. 6 ' Potential sources of nitrate to soil and groundwater include fertilizer that may be used in the area, waste from any animals kept on the site, and septic usage. 5. SOIL PROFILE 6. The subsurface conditions at the site were exploo before noon on December 13, 2004 by drilling a boring to a depth of about 15 feet below existing grade. The boring was drilled using a Simco 2400 truck-mounted drill rig equipped with 4%2-inch O.D. solid-stem auger. The 110. approximate location of the test boring and dimensions from a reference point are presented on the Plate 2. A representative with our firm maintained a log of the boring and visually classified the soils encountered according to the Unified Soil Classification System (see Plate 3). Based on our findings, the subsurface soil encountered in our boring consisted predominately of fine-grained silty sand to a depth of about 5%2 feet below the existing ground surface, underlain by interbedded strata of relatively "clean" sand, silty sand, and sandy silt to a depth of about 11 feet. These soils were further underlain by relatively `clean" sand to the maximum depth explored. A key to the Log of Boring is presented on Plate 4. A more detailed description of the subsurface conditions encountered during our field investigation are presented on the Log of Boring, Plates 5. L 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 Veritas soil series (Map Symbol 266). This soil is described as having "moderate" percolation characteristics for septic tank absorbtion. Other attributes are given in the table below: Map Available Water Capacity, Organic ` Symbol Soil Name inches/inch pH Contentpercent 266 Veritas 0.12 -0.15 7.4-8.4 1 - 2 L L L52251.GOIISTOSR192 February 17,2005 ©2005 Kleinfelder,Inc. Page 3 of 8