Laserfiche WebLink
i <br /> KLEINFELDER <br /> GEOTECHNICAL SERVICES REPORT <br /> SLOPE STABILITY ANALYIS <br /> THOMING AGGREGATE QUARRY <br /> VERNALIS,CALIFORNIA _ <br /> 1. INTRODUCTION <br /> In this report we present the results of our geotechnical services performed for the proposed <br /> Thoming Aggregate Quarry to be located in Vernalis, California. The site location relative to <br /> existing streets is shown on Plate 1. <br /> We understand that the proposed quarry will be excavated with side slopes of 3/a:l ('/a <br /> horizontal to 1 vertical) and will have a maximum depth of about 175 feet. The quarry slopes <br /> will be excavated with 15-foot wide benches every 30 vertical feet. The quarry walls will later <br /> be reclaimed using overburden soils at a slope of 1'/z:l (1'/2 horizontal to 1 vertical). The T <br /> reclaimed slopes will also be constructed with 15-foot wide benches every 30 vertical feet. <br /> In the event these details are inconsistent with the final design criteria, our firm should be <br /> contacted prior to final design in order that we may update our recommendations as needed. <br /> 2. FIELD AND LABORATORY INVESTIGATIONS <br /> The subsurface conditions at the site were explored by drilling ten borings to depths ranging _ <br /> from about 90 to 120 feet below existing grade. The borings were drilled using a continuous <br /> sampling Roto-Sonic truck-mounted drill rig. The approximate boring locations are presented <br /> on Plate 1. <br /> T <br /> Thirty-two Grain-Size Analyses were performed on samples obtained from the borings in <br /> accordance with current ASTM standards on selected soil samples. <br /> I <br /> 3. PREVIOUS INVESTIGATIONS <br /> Our previous experience in the project area includes several studies at the nearby Teichert and <br /> DSS pits and the geotechnical investigation for the replacement of PG&E's Line 108 that <br /> included horizontal directional drills under I-5, the California aqueduct, and the Delta Mendota <br /> Canal at the project site. We note that stable slopes of/a:l and V2:1 were observed at the <br /> nearby Teichert and DSS pits that have been in place for several years and have performed <br /> well. Pictures of these slopes are included on Plates 2 and 3. l <br /> Block samples were previously obtained from aggregate pits in the project area, and <br /> Unconfined Compressive Strength tests were performed on each sample. Prior to testing, each r <br /> T_ <br /> 29007.G01/ST03R1215 August 21,2003 <br /> ©2003 Kleinfelder,Inc. Page I of 5 r <br />