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Ms. Gail Wiggett Project 20C42-001.026 <br /> June 25, 1998 <br /> Page 4 <br /> CONCLUSIONS <br /> The grouting procedures were conducted to obtain the project objectives of sealing a <br /> conduit for vertical migration of the dissolved petroleum hydrocarbons. The volume of <br /> grout placed of 9 cubic yards exceeded the estimated quantity by approximately 5.6 times. <br /> This volume seated the borehole to 55 feet, accounting for voids in the annular space, thus <br /> sealing the formation wall The first-encountered water-bearing zone is the source of <br /> groundwater impact to deeper zones, and the grouting procedure removed the well bore as <br /> a man-made conduit for vertical migration. <br /> The information presented addresses the issues regarding the well abandonment <br /> procedures. If you have any questions, please call. <br /> Sincerely, <br /> EMCON�,� <br /> a_ <br /> a - J . #6561 Charles S. Metzin er <br /> Mark Capps, R.G g <br /> Project Geologist Project Manager <br /> cc: Robert Donovan, Tesoro <br /> Marilyn Guthrie, Tesoro <br /> Don Motsko, Water Development Corporation <br /> Ron Rowe, PHS/EHD <br /> SAON:.TJMC4MC420012.6DE-991hac s:I <br />