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r7A review of Application Permits on file with the Environmental Health Department shows there has been only one Application for Repairs/Additions to septic systems within the one-half mile radius study area. This addition was for a filter bed installed at 8898 West Schulte Road. A filter bed was designed and installed for this property probably due to area constraints. The area around the subject property has been designated "High Water Table Areas" by EHD. Therefore, since the water table is shallow in this area, seepage pits or sumps are not allowed. The Mattos's stated that there has never been a problem with the two septic systems on Parcel 2, which have been in operation for over 50 years. SOIL PROFILE AND PERCOLATION TESTING The soil from 0 inches to 24 inches is uniform and consists of a dark brown clay, with little sand and silt. The soil has a medium organic matter content, and medium moisture content. The Unified Soil Classification System(USCS) classifies this soil as CL-ML - a lean clayey silt. From 30 inches to boring termination at 42 inches, exists a light yellowish brown clayey silt- classified also as CL/ML. A Log of Boring designating the USCS soil classification for the percolation test boring is found near the top right-hand corner of the FIELD PERCOLATION TESTING REPORT. Percolation testing was conducted onarp c_el 1_in the extreme southwest corner of the parcel since there was no other open land -the entire parcel is planted in beans. Therefore.this location theoreticall;rrp:esents the entire subject Parcel. Pert testing for parcel 2 was done north of an existing concrete pad and 165 feet north of the existing domestic well. Perc testing for parcel 3 was done in the anticipated location of the proposed leachfield area for Randy Mattos's future house and 168 feet north of an open Westside Irrigation ditch. All three test borings were 42 iaghZLdeep. The borings were drilled on July 28. On July 31, gravel was added to the borings and they were pre-saturated the day before testing. Perc testing commenced on August 1. Readings were taken over a four-hour test period to ensure maximum soil saturation under "worst-case scenario" conditions. The perc tests exhibited rapid percolation for all three parcels. The last half hour of the test was witnessed by Justin Herr of the San Joaquin County Environmental Health Department. LOCAL GROUNDWATER AND SURFACE WATER INFORMATION The 1992 Lines of Equal Elevation Map published by the San Joaquin County Flood Control District is the only recent groundwater map available that illustrates the groundwater elevation in the Tracy area, and therefore the directional flow. It appears, and is generally accepted, that the groundwater is flowing in a northeast direction toward the San Joaquin River. The groundwater gradient can also be assumed by the declination of the land, which groundwater flow typically follows. However,the most reliable source that groundwater directional flow is in a northeast direction is groundwater remediation that is occurring at the Tracy Defense Depot. Page -2 J-) - Chesney ConsaftiV