SU0004820_SSNL - Laserfiche WebLink

Home Browse Search

1 k'q KLE1NFELDER to the Logs of Borings is presented on Plate 5. Detailed description s of the subsurface conditions encountered during our field investigation are presented on the Logs of Borings, Plates 6 through 17. The Soil Survey of San Joaquin County, California published by the U.S. Department of Agriculture, Soil Conservation Service (1992) maps six distinct soil series within the study area. The soil names and symbols, along with soil attributes, are given in the table below. [ 7 General Percolation A�arlabe Water "' Organic Map SO11 f< s �x t LS§ # i'g� ,, for Septtc , ; Capacity, pR Content i Symbol Name tion Fields _.�. ,rncbcsl�nch ...,� :. :... ercent 170 Hicksville Severe 0.11 -0.20 5.6-7.8 1 -3 189 Kingdon Moderate 0.10-0.16 5.6-- 8.4 1 -3 216 Ramoth Severe 0.08- 0.15 5.6-7.3 . <1 220 Redding Severe 0.04-0.14- 5.1 -6.5 <2 . 221 Redding Severe 0.04-0.14 5.1 -6.5 <2 256 I Tokay Slight 0.10-0.15 1 ,6.1 - 8.4 .1 -3 v 6. PERCOLATION TESTING Shallow and deep percolation test holes were installed in each of the proposed parcels with the same drill rig used for the soil profile boring, only equipped with a 6-inch diameter auger. The approximate percolation test locations are presented on Plate 2. Following drilling, the sides of the holes were scored, and significant loose material was removed from the bottom of the a holes. Test holes were originally drilled and prepared on March 17 and 18, 2005. However, due to heavy rains, soil washed into the test holes and the percolation tests were not completed. j Our drill rig.returned to the site on May 10, 2005 and cleaned out and reset the percolation holes in accordance with SJCEHD criteria. Approximately 2 inches of fine gravel was placed at the bottom of each test hole. he percolation tests were run on May 11 and 12 2005 ill acggLdance wilb ac ad pidelines. using clear potable water. The tests holes were resoaked with at least 12 inches f e at least 24 hours prior to testing. During the three days of testing the skies were overcast, the temperatures were cool, and there were periods ofrainfall. The approximate depth of each percolation test below existing site grade is shown on the following table. The holes did not exhibit sloughing or caving. From a fixed reference point, a marked location on the side of PVC pipe inserted into each hole, the drop in water levels were measured in approximate 30- minute intervals for four hours, refilling as necessary to maintain the prescribed amount of water over the.gravel (SJCEHD Procedure #2). As specified, the last two 30-minute readings } were recorded under the observation of a representative.from the SJCEHD and were used to calculate the percolation rate in minutes per inch. A summary of the percolation test results are presented in the following table. The initial. ercolation tests in L d. On the morning of May 18 2005 our drill rig returned to the s' _,,,iataUed-an„a im al deep percolation test hole in each of these lots with the same equipment previously used. Upon 55208.GO1/ST05R644 June 1,2005 O 2005 Kleinfelder,Inc. Page 4 of 9