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,,/ M KLEINFELDER 2. PAST AND PRESENT USE Based on information provided to us by Mr. Rowett and Mr. Markus Bokisch of Bokisch Ranches, we understand that the site was planted in grapes in 1990. Prior to 1990, the site was primarily dryland pasture except for the immediate vicinity of the barn/shop, where a few small chicken or turkey houses were kept since construction in the 1970s. These structures were apparently removed when the grapes were planted. 3. SEPTIC PERMITS AND PERFORMANCE A search was performed for septic permits on file with San Joaquin County Environmental Health Department (SJCEHD) for the subject property and parcels adjacent to the subject property. One septic permit was on file for the subject property and one permit was available for an adjacent parcel. The permit for the subject property was for a repair/addition to the existing residential septic system. According to the permit, the leach field was being abandoned and seepage pits were being added to the system. No details regarding the original construction of the septic system were on the permit. The other permit was for a new septic system installation for a single-family residence. Please see the attached table for a summary of permit information. The property surrounding the subject property is agricultural or range land, with few residences. According to Mr. Bokisch, to the best of his knowledge, none of the adjacent properties require additional septic system work to be performed at this time. Based on the relative absence of permits on file with SJCEHD, it appears that few of the leach field/seepage pit systems in the immediate vicinity of the subject property have required repairs/additions, except for the subject property. 4. GROUNDWATER During the time of our investigation, groundwater was not encountered. Lines of Equal Depth to Groundwater contour maps published in groundwater reports by the San Joaquin County Flood Control and Water Conservation District show groundwater levels in the project area ranging from about 140 to 190 feet below ground surface from Spring 1981 to Spring 1999. Some of the contour maps for these years do not have contours that cover the site. Based on Equal Elevation of Groundwater maps, the general groundwater gradient is from east to west. Local gradient variations may be present due to well usage. We do not know of any existing and/or potential groundwater contamination issues in the project vicinity. There are no existing gas stations or dairies adjacent to the property. The on-site and adjacent residential septic systems, as well as seasonal fertilization of the vineyard and off-site agricultural land, if performed, are probably the largest contributors of nitrogen to groundwater in the project vicinity. We anticipate that septic system usage and ongoing vineyard/landscaping fertilization will be the primary future on-site sources of nitrogen to soil and groundwater. 36600.G01/ST03RI537 October 16,2003 O 2003 Kleinfelder,Inc. Page I of 7