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' . 30 June 1999 <br /> AGE-NC Project No. 98-0468 <br /> ' Page 4 of I2 <br /> 2.4. SITE GEOLOGIC CONDITIONS <br /> Information regarding.site geologic conditions was obtained from boring logs previously reported <br /> by Twinning. Soil encountered in borings MW-1 and MW-2 was described as consisting of silty sand. <br /> ' at approximately five feet bsg,'and fine-grained silty clay and sandy silt at approximately 11 feet bsg, <br /> respectively. Silty and clayey sand was reported at approximately 15 feet bsg in borings,MW-2 and <br /> ' MW-1. Also, silty clay was reported in boring MW-1' at 15 feet bsg. However, during.site <br /> characterization activities, shallow subsurface soil collected from soil borings SB-I-through SB-7. <br /> were reported to consist of clay from'ground surface to a depth of 16 feet bsg (Twining, 1997). <br /> 3.0. SCOPE OF WORK <br /> The Additional Soil and Ground Water Assessment was conducted to assess the extent of petroleum <br /> hydrocarbon impacts according to the following scope of work: <br /> • 'Advancement of five soil borings. <br /> Collection of soil samples from each soil boring. <br /> • Collection of ground water samples from selected soil borings. <br /> • Installation and development of two ground water monitoring wells. <br /> • Collection-of ground water samples from each of the site monitoring wells. <br /> ' Laboratory analysis of selected soil and ground water samples for BTEX,TPH-g,TPH-d,and <br /> fuel oxygenating compounds including di-isopropyl ether (DIPS), ethyl tertiary-butyl ether <br /> (ETBE), MTBE;tertiary-amyl methyl ether (TAME} and tertiary-butanol (TBA). <br /> • Preparation of this report presenting'AGE's findings, conclusions, and recommendations. . <br /> ' 4.0. SITE INVESTIGATION ACTIVITIES <br /> On 27 and 28 April 1999,'AGE personnel conducted soil and ground water sampling activities at the <br /> site. Additionally, on 06 May 1999, ground water samples were collected from each of the-site <br /> monitoring wells. Prior to mobilization,the site.location was clearly marked and a.utility clearance <br /> ' was obtained through Underground Service Alert. Detailed field procedures and protocols are <br /> presented.in Appendix A. Results of the additional soil and ground water assessment are presented <br /> in Sections 5.0. <br /> Arhanced CeoEnvironmental,inc. <br />