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WORK PMN <br /> SUBSURFACE INVESTIGATION <br /> CORRAL HOLLOW AND BYRON ROADS <br /> TRACY, CALIFORNIA <br /> AUGUST, 1989 <br /> Introduction• <br /> The SEECON Construction Company, 4300 Railroad Avenue, P.O. Box 1458 <br /> Pittsburg, CA 94565, has engaged Terrestrial Technology, Inc. , to <br /> perform the following field work and report writing that will identify <br /> and describe the subsurface soil condition along a line approximately <br /> 150 feet north of Byron Road in Tracy, California (see figure 1). <br /> The contact person is Jerry Kirkpatrick at (415) 439-1086. <br /> This line, or an adjusted alignment, will be established to delineate <br /> between a contaminated soil mass along the Southern Pacific Railroad <br /> right-of-way and a noncontaminated soil mass north of Byron Road -- <br /> a portion of which is proposed for subdivision. The property under <br /> investigation is assessors parcel number 231-38-2 located in the SW <br /> 1/4 of section 20 T.2S. R.5.E. M.D.B.M. <br /> Task Descriptions: <br /> 1. A surveyed line will be established approximately 150 feet north <br /> of the north right-of-way boundary of Byron Road. The line will <br /> begin at Corral Hollow Road and run southeast parallel to Byron <br /> Road for a distance of approximately 2,000 feet to the west boundary <br /> of the property. Beginning at Corral Hollow Road, points on the <br /> above line will be established at approximately 400 foot intervals. <br /> 2. Soil borings to depths of 25 feet will be made at the 400± foot <br /> intervals using a 6 or 8 inch hollow stem auger. It is believed <br /> that contamination may have occurred in this area at depths to <br /> 20' or more before the ground water level rose to its current <br /> elevation due to irrigation. These soil boring holes will be <br /> filled with bentonite pellets to the top of the ground water level . 4�(� <br /> In thecas--es where -d­ritT1m­g-!s—more than I6' below the ground / <br /> water level , this bentoniting will be done by tremie effect. <br /> The remainder of the soil boring will be sealed with a concrete— <br /> bentonite <br /> oncrete—bentonite slurry to surface to the satisfaction of the San Joaquin <br /> Local Health District. The augers will be steam cleaned after <br /> each hole is bored. The driller, with a C-57 California <br /> Contractor' s License, will be a peron of extensive experience <br /> in performing soils borings and soil sampling. The truck-mounted <br /> boring machine will be equipped with a split spoon sampler suitable <br /> for taking continous core samples. Soil tailings removed from <br /> the ground will be treated as contaminated and stored in barrels. <br /> These containers will be capped and stored on site until laboratory <br /> results indicate no contamination exists. If it is found that <br /> contamination does exist, an approved waste hauler will be used <br /> to move this soil to an approved disposal site. <br />