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PERCOLATION TESTING On each of the three subject Lots tested,two perc test borings were drilled near the continuous cores on August 9, 2005, using solid stem auger. One boring was drilled to shallow depths of 38- 40 inches, representative of effluent percolation from leachlines. The other boring was drilled to a deeper depth,where permeable strata was encountered as observed in the continuous coring process. The percolation test boring locations are illustrated on the Site Plan found in Appendix A. After drilling the shallow perc test borings,the sidewalls were scored with a pry-bar and the loose material removed. The deeper borings could not be scored due to their depths. Two inches of pea gravel was placed at the bottom to prevent scour and three-inch perforated PVC pipe was inserted in all six of the test borings. All perc test borings were pre-saturated on August 11, 2005 at 0800 hrs with 12 inches of clear water in accordance with EHD regulations. Yl On August 12, 2005, 0630 hrs,percolation testing commenced for all six borings. Post-soak status for each test boring is illustrated in the Table below. If standing water was measured in the test boring, EHD Perc Test Procedure#1 was conducted for these test borings. If no water remained, EHD Test Procedure#2 was conducted. The last half hour of the tests, in addition to perc test boring depth and water head depth,was witnessed by Lisa Medina, R.E.H.S. of the San Joaquin County Environmental Health Department. r The following Table illustrates the proposed Parcel number, septic system structure to be installed based on depth of acceptable perc rates, Watkinson Road Address, A.P.N. Number,post soak period status and percolation test results for the respective Lot number and perc test depth: PERCOLATION TEST RESULTS AND RELATED DATA LOT NUMBER AND ADDRESS PERC TEST DEPTHS: POST-SOAK PERC TEST SEPTIC SYSTEM SHALLOW PERIOD RESULTS STRUCTURE TOBE INSTALLEDDA.P.N.NUMBER DEEP STATUS Lot 3 26007 North 38 INCHES —4 Inches FAILED Leachlines and Watkinson Road Standing Water (0 min/in) Seepage Pits (Has Existing Well) 012-030-51 174 INCHES(14.5 FEET) No Standing 27.8 niWin Water in Hole Lot 4 26103 North 40 INCHES —4 Inches FAILED Leachlines and Watkinson Road Standing Water (250 min/in) Seepage Pits (Has Existing Well) 012-030-50 222 INCHES(18.5 FEET) No Standing 15.6 min/in Water in Hole Lot 5 26185 North 39 INCHES No Standing 41.7 min/in A Leachlines and Watkinson Road Water in Hole Seepage Pits (Has Existing Well) 012-03048 234 INCHES(19.5 FEET) 0 i„ci,c, FAILED Standing Water (250 min/in) Page-2- Chesney Consulting