ARCHIVED REPORTS_ENGLISH OAKS PLAZA SOIL BORING INSTALLATION

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Report—Soil Boring Installation Page 3 2525 Hutchins Road,Lodi ' Project No. 503.2 February 14, 2005 2.0 FIELD DATA COLLECTION PROCEDURES ' 2.1 Preliminary Site Work ' As mentioned above, a permit to drill was obtained from the San Joaquin County Department of Environmental Health. A copy of the permit is attached in Appendix C. Prior to drilling, Underground Service Alert (USA) was contacted ' to mark the locations of buried utility lines in the vicinity of the soil boring location. ' 2.2 Hollow Stem Auger Soil Boring The soil boring (designated B-1) was completed on October 3, 2005 at the general location described in Section 1.2 and as shown on the attached site map. ' The soil boring was drilled using 2-inch outside diameter Power-Probe® drilling equipment owned and operated by Resonant Sonic International (RSI) of ' Woodland (C-57 License #802334). The Power-Probe® is a truck mounted drilling system that uses direct push methodology to collect soil and ' groundwater samples. Four foot long steel rods are pushed or hammered into the ground using a hydraulic ram or the hydraulically actuated hammer mounted on the ram. Soil samples are collected using a 4-foot long by 2-inch ' inside diameter drive sampler lined with a plastic sample sleeve. The boring was advanced to a total depth of 44 feet where swelling clays repeatedly closed the boring and prevented deeper penetration. The Power-Probe® system is also ' capable of drilling with 4-inch diameter solid-stem augers. Upon reaching the point of refusal with direct-push tools, the boring was drilled out to a depth of 50 feet using the augers. At that point, drilling using direct-push tools resumed. ' The boring reached a total depth of 76 feet and at that point had about 10 feet of groundwater in the boring. ' A log of the boring was kept that noted the soil characteristics such as lithology, color and texture (see Appendix B). Other information logged included sample ' times, soil staining and any unusual odors. The soil boring was sampled at 4- foot intervals for geological and possible analytical evaluation using a 2.0-inch diameter by 4-foot long plastic sample sleeves. Due to difficulty experienced in ' retracting the push-point at the base of the sampler, soil samples below 44 feet could not be collected. ' During drilling, the soil cuttings were temporarily stored in a steel drum located on the site pending determination of proper disposal methods. Upon reaching total depth in the boring and collecting a groundwater sample, the boring was ' filled to grade with neat cement using a tremie pipe. ' 2937 VenemanAve.,#B240 Geo-Phase EnvironmcotalIoc. Phone (209) 569-0293 Modesto, CA 95356 Fax (209) 569-0295