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Richland Communities Inc. 5943.5.001.03 <br /> 1481 West Manila Road, PA-04-266 (MS) September 9, 2004 <br /> SEPTIC FIELD SOIL SUITABILITY STUDY Page 2 <br /> used for alfalfa production (Figure 2). Future changes to land use have not been determined at <br /> this time. <br /> Existing Septic Tank Use <br /> We reviewed septic system permits at the San Joaquin County Environmental Health Department <br /> and found one se tic s stem permit dated J for the property at 1481 West Manila <br /> Road (APN 191-270-01). T e permit­was a new septic tank installation with 200 feet of <br /> leach line <br /> A review of the septic system permits for parcels adjacent to APN 191-270-01 was performed. <br /> In general, the septic system permits encountered for the adjacent parcels indicates that these <br /> systems consist of conventional septic tanks with leach lines. Except for destruction of septic <br /> systems, pump replacement, and the addition of leach lines, no records were found indicating <br /> repai s to septic systems on or m the immediate vicinity of the property. A summary of the <br /> septic tank permits reviewed is included in Table I with copies of the permits attached in <br /> _ Appendix A. <br /> Soil Profile and Depth to Groundwater <br /> ` As part of this study, ENGEO subcontracted a rubber-tired backhoe with a 24-inch wide bucket <br /> to excavate two soil profile test pits (one on each proposed parcel) at the site. The test pits were <br /> excavated and logged on August 24, 2004 by an ENGEO geologist. The test pits were <br /> ` approximately 24 inches wide, by 12 feet long, by 8 feet deep. The approximate location of each <br /> test pits (TP#1 and TP#2) is shown on Figure 2. <br /> The soils in Test Pit #1 were observed to include an approximately 1.5-foot thick disturbed <br /> surface layer of olive brown clayey silty sand with alfalfa roots underlain by a 2.5-foot thick <br /> zone of undisturbed, olive brown, clayey silty sand. Below these layers we encountered olive <br /> silty sand with some clay to a depth of 8 feet, the maximum depth explored. The soils in Test Pit <br /> #2 consisted of an approximately 1.5-foot thick disturbed surface layer of dark brown clay with <br /> silt and some sand with alfalfa roots in the upper 12 inches underlain by a 2.5-foot thick zone of <br /> undisturbed, light olive brown, clayey silty sand. Below these layers we encountered olive <br /> brown silty sand with clay to a depth of 8 feet. Free groundwater was encountered in both test <br /> pits at a depth of 8 feet below the existing ¢roundc»� According to data reviewed for this <br /> study, the groundwater gradient at the site is to the west,towards the San Joaquin River. Further <br /> excavation deeper than 8 feet was prevented by collapsing of the test pits sidewalls. The test pits <br /> logs are attached as Appendix B. <br /> Well Water Sampling <br /> As required by item C of Reference 1, ENGEO collected a water sample from the private water <br /> well onsite. One water sample was collected on August 10, 2004 from the existing onsite well <br />