FIELD DOCUMENTS_FILE 1 - Laserfiche WebLink

Home Browse Search

KLEINFEL DER File No. 23 -480020. D00 r August 26, 1994 1 4.0 FIELD ACTIVITIES Irl Prior to conducting any subsurface exploration, Kleinfelder contacted Underground Services Alert (USA) to locate underground utilities on or adjacent to the site. Additionally, Kleinfelder subcontracted Norcal Geophysical Consultants of Petaluma, California to conduct a geophysical survey on-site (both within the sidewalk and building areas). Kleinfelder then collected a total of [ I eight (8) soil samples for environmental purposes and fourteen (14) for geotechnical purposes from two soil borings advanced on site. All of the soil borings were advanced adjacent to the garage at one end of either of the USTs. 4.1 DRILLING AND SOIL SAMPLING I The soil borings were advanced on June 2, 1994 using a truck-mounted drill rig equipped with 8- inch hollow stem augers. For the location of the borings, please refer to Plate 1 . Soil cuttings from the soil borings were placed in 55-gallon drums and stored inside the garage. All borings were backfilled by pumping a neat cement grout with approximately 2 percent bentonite added to reduce shrinkage. While drilling, an experienced environmental and geotechnical engineer classified the subsurface soil and logged the boreholes. A copy of the Unified Soil Classification System used to classify I the soil and a log key are provided in Appendix A. Descriptions of the sample intervals and the L soil encountered in each boring are also presented in Appendix A. Kleinfelder's Field Procedures for drilling and sampling are provided in Appendix B . A copy of the drilling permit obtained F-) from San Joaquin County is provided in Appendix C. J The two borings were advanced a maximum depth of approximately 25 feet below grade. Soil samples were collected in these borings at 5400t intervals to the bottom of the boring. Generally, the soil encountered beneath the site consisted of alternating units of gray/black clayey sand/silty clay in the upper 9 to 15 feet. Below the clayey sand/silty clay was alternating units of gray/gray-brown clayey sand and clayey silt to the maximum depths explored. Groundwater was not encountered in our borings. 4.2 QUALITATIVE FIELD SCREENING To provide a qualitative indication of the presence of volatile organic constituents in the soil and to monitor the constituent concentrations in the breathing zone, a portable organic vapor analyzer IJ ETH:md 7EI94 Copyright 1994 Kleinfelder, Inc. Page 8 of 14