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;�� K L E I N F E L D E R • reduce moisture loss and disturbance and brought to our Stockton laboratory foi further testing A key to the Logs of Borings is presented on Plate A-2 of the appendix The Logs of Borings are presented on Plates A-3 to A-8 of the appendix Please note the bonnQs were located in the field by visual sighting and/or pacing from existing site features Therefore, the locations of borings shown on Plate 1 should be considered lughly approximate and may vary from that indicated on the plate 32 Laboratory Investigation Laboratory tests were performed in accordance with current ASTM standards on selected soil samples to evaluate their physical characteristics and engineenng properties The laboratory testing program was formulated with emphasis on the evaluation of natural moisture content, in-place density, grain-size distribution, plasticity, and undrained shear strength of the materials encountered One resistance value (R-value) test was performed on a composite sample of the subgrade soils to evaluate preliminary pavement sections In addition, pH, minimum resistivity, sulfate, and chloride tests were performed to evaluate the corrosivity of the soils to buried concrete and ferrous metals The results of laboratory tests are summarized on Plate A-9 in the appendix This information, along with the field observations, was used to prepare the final test boring logs 4 SITE CONDITIONS 41 Surface The alignment of the proposed sewer trunk lies in a mostly residential area located east of the San Joaquin River/Stockton Deep Water Channel and north of Smith Canal Interstate 5 is in the western portion of the study area, and Pershing Avenue is on the eastern side of the project area Boring B-1 was dnIled in a relatively level vacant Iot west of I-5 scattered weeds covered the ground surface Borings B-2 through B-& were drilled out of traffic in pavement areas along Country Club Boulevard Plymouth and Mission Roads, and Middlefield Avenue Borings B-2 13-3 and B-b were located in City of Stockton right-of-wavy and Borings B-4 and B-5 were in San Joaquin County right-of-way 42 Subsurface The subsurface conditions encountered were relatively consistent with our previous omoerience in the project area These soils consisted predominately of moderately plastic stiff to hard sandy and silty cla-v to depths ranging from about to 10 feet below the existing site °rade 1"629 G01/2002R369 aprii 19 '002 �5 2002 Klemtelder Inc Paee' of 16