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r Richland Communities Inc. 6008.5.001.03 Lawrence and Award Property December 3,2003 SEPTIC FIELD SOIL SUITABILITY STUDY Page 2 Present and Past Uses of the Property Our research indicates that the Property is zoned as AG40, for general agricultural use and has historically been used for agriculture production and the Haven Acres Mobile Home Park and Marina. We observed that the Property is currently occupied by the Haven Acres Mobile Home Park and Marina, fallow agriculture production land, and paved and dirt access roads. Existing Septic Tank Use We reviewed septic system permits at the San Joaquin County Environmental Health Department found that the Haven Acres Mobile Home Park and Marina has septic system permits dating from 1961 to 1999, reportedly consisting of an estimated 15 redwood and concrete septic tanks with approximately 1300 feet of leach field. A summary of the septic tank permits for the Property is included in Table I. A review of the septic system permits for sites surrounding APN 191-270-13 was performed and summarized in Table II. Except for destruction of septic systems and the addition of leach lines, no records were found indicating repairs to septic systems on or in the immediate vicinity of the Property. Soil Profile and Groundwater As part of this study, ENGEO subcontracted a rubber-tired backhoe with a 24-inch wide bucket to excavate a soil profile trench at the site. A 12 feet long and 13 feet deep trench was excavated and logged on November 17th, 2003 by an ENGEO geologist. The approximate location of the trench is shown on Figure 2. The soils in the trench consisted of a 1-foot thick disturbed surface layer of brown sandy clay with disked safflower stalks. Below this surface layer was a 1-foot thick zone of reddish brown clayey sand underlain by light brown, dark reddish brown, and gray silty sand to the depth explored. Free groundwater was observed at a depth of 11 feet below the existing ground surface. Further excavation deeper than 13 feet was prevented by collapsing of the trench sidewalls. The log of the trench is included in Appendix A. Test pits excavated at the site on September 10, 2003 during a previous study (ENGEO, 2003a) measured groundwater levels ranging from 81/2 to 101/2 feet below the existing ground surface with a gradient to the west and northwest towards the San Joaquin River. To provide groundwater information as requested by the county, a 2001 Terrascarch groundwater report is attached in Appendix B. The Terrasearch (2001) report summarizes their sampling methods and result for water samples previously collected from three monitoring wells on the site and from the adjacent San Joaquin River.