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SENT BY:EMCON ; 6-16-98 ; 1:55PM EMCON SACRAMtN10- u o 0 <br /> Mr. Ronald Rowe Project 20C42-001.026 <br /> June 12, 1998 <br /> Page 4 <br /> I <br /> I <br /> CONCLUSIONS <br /> The grouting procedures were conduked to obtain the project objectives of sealing; a <br /> conduit for vertical migration of the issolved petroleum hydrocarbons. The volume of <br /> grout placed of 9 cubic yards exc ed the estimated quantity by approximately <br /> 5.6 times. This volume sealed the borehole to 55 feet and would have accounted for <br /> voids in the annular space, thus staling the formation wall. The first-encountered <br /> water-bearing zone is the source of groundwater impact to deeper zones, and the <br /> grouting procedure removed the well gore as a man-made conduit for vertical migration. <br /> The information presented address the issues regarding the well abandonment <br /> procedures. If you have any questions,please call. <br /> Sincerely, <br /> EMCON `� 1001 <br /> Mark Capps,R.G. #6561 Charles S. Metzinger <br /> Project Geologist Project Manager <br /> i <br /> cc: Robert Donovan,Tesoro <br /> Marilyn Guthrie,Tesoro I <br /> Don Motsko, Water Developmnt Corporation <br /> Gail Wigget,Regional Water Quality Control Board,Central Valley Region <br /> I <br /> snc\NAPJmUC42W,42un12.4AFA81cbd1:t I Emcon <br /> ! Rev.U.JWC I2,1998 <br />