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- Ms Mary Meays Biwa <br /> November 29, 1995 (9347-0020) <br /> Undisturbed soil samples were collected at 5-foot intervals beginning at 5 feet bg using <br /> a 1-1/16-mch diameter split spoon This process does not generate soil cuttings Soil samples <br /> were field screened using a portable organic vapor monitor Ground water was encountered in <br /> borings GEO1 through GE04 at approximately 48 feet bg Grab ground water samples were <br /> collected using pre-cleaned bailers that were lowered through the push rod assembly Boring logs <br /> are included in Attachment 3 <br /> Laboratory Analysis <br /> Nine soil and four water samples collected from borings GEO1 through GE04 were <br /> submitted to Sequoia Analytical, of Sacramento, California for the following chemical analysis <br /> • TPH-G using EPA Method 8015 <br /> • Benzene, toluene, ethylbenzene, and total xylenes (BTEX) using <br /> EPA Method 8020 <br /> i <br /> The soil sample and grab ground water analytical results of this investigation are <br /> summarized in Tables 1 and 2 The laboratory report and chain-of-custody forms are included <br /> in Attachment 4 for soil and Attachment 5 for water The distribution of dissolved-phase benzene <br /> in ground water on October 5, 1995 and September 21 and 22, 1995, sampling events is shown <br /> on Figure 2 <br /> Site Geology and Hydrogeology <br /> Review of the boring logs indicates that the soils encountered during drilling are <br /> continuous across the site Silt was encountered at various depths in all of the borings Sand <br /> was encountered from approximately 16 to 24 feet bg in boring GEO1, 12 to 24 feet bg in GE02, <br /> 1 to 15 feet bg in GE03, and at various depths in GE04 <br /> Ground water was generally encountered at approximately 48 feet bg during the <br /> advancement of borings GEO1 through GE04 The depth to ground water measured in the <br /> monitoring wells at the site on October 5, 1995, is approximately 48 feet bg The October 1995 <br /> ground water monitoring data indicates that the ground water flows in a northwesterly direction <br /> with a hydraulic gradient of 0 001 foot per foot <br /> I <br /> 93470200 ARP -3 - <br />