SU0005653 SSNL - Laserfiche WebLink

Home Browse Search

V,7 �an 6" On September 14, 2005, 1100 hrs, one shallow perc test boring and one deeper test boring, varying from 9.5 to 19 feet were drilled with a truck mounted drill rig on proposed Parcels 1 and the Designated Remainder. These test borings were drilled in the proposed future leachfield areas for the new homes. The sidewalls of the shallow borings were scored with a pry-bar and the loose material removed. Two inches of fine gravel was placed at the bottom and three-inch perforated PVC pipe was inserted in each of the test borings. All borings were pre-saturated Sunday, September 18, 2005 at 1000 hrs with 12 inches of water. /(99 On September 19, 2005, 0800 hrs, percolation testing commenced for all four borings. There was standing water after the 24-hour soak period in the two shallow perc tests borings, as illustrated in Table 1 below. Consequently, EHD Pere Test Procedure#1 was conducted for these two borings. here was no standing water after the 24-hour soak period in the two deep test borings. Therefore, P EHD Test Procedure#2as performed for these borings. The last half hour of the tests was witnessed by Lisa Medi a, REHS of the San Joaquin County Environmental Health Department. The maximum acceptable perc rate is 60 min/in for shallow perc tests and 30 min/in for the deep tests. j/ a The following Table illustrates the proposed Parcel number,potential septic system structure based on depth of passing perc rates,proposed acreage,post soak period status and perc test results for the respective perc test depths: TABLE 1 PERCOLATION TEST RESULTS AND RELATED DATA PROPOSED PARCEL PROPOSED PERC TEST DEPTHS: POST SOAK PERC TEST AND POTENTIAL ACREAGE SHALLOW PERIOD RESULTS SEPTIC SYSTEM DEEP STATUS STRUCTURE Parcel 1 5.0 Acres 42 INCHES 4 inchesP25 ED Leachlines and Sumps Standing Watern/in) 114 INCHES (9.5 FEET) No Standingnlin Water in Hole s Designated Remainder 5.0 Acres 42 INCHES 3 InchesED Parcel Standing watern/in) Leachlines and Limited Depth Seepage Pits or 228 INCHES(19 FEET) No Standing 4,1'rnin/in Deep Sumps Water in Hate 4.0 LOCAL GROUNDWATER AND SURFACE WATER INFORMATION {� 4.1 The 1999 Lines of Equal Depth Map published by the San Joaquin County Flood Control illus rates the groundwater depth to be 110 feet below ground surface (b.g.s.). The 1999 Lines of Equal Elevation Map illustrates the groundwater elevation to be relatively flat, with a flow in a northerly direction. Page -3- Chesney Consulting