Laserfiche WebLink
Mr. John Tomko <br /> Page 2 <br /> June 26, 1989 <br /> We feel that if we can riot obtain samples without endangering both <br /> the drillers equipment and the well , our best course of action is to <br /> begin abandoment procedures on the wells as soon as possible. We <br /> discussed this situation with the San Joaquin Local Health District. <br /> They also felt, that upon your approval , abandonment seemed the best <br /> course of action. <br /> The drilling contractor who has completed several abandoments in San <br /> Joaquin' County, has come up with a procedure that would safely seal <br /> these wells from vetically transmitting any future contamination. <br /> Again , with your approval , we can arrange to begin this procedure. <br /> ABANDONMENT PROCEDURE <br /> The abandonment procedure, as described by the driller would begin <br /> by placing a "Scratcher" tool down the casting. This home-made tool <br /> is basically a tremie pipe with fingers that protrude out at slight <br /> angles from the bottom. A light bentonite slurry is slowly released <br /> through the pipe as the "scratcher" is turned to disturb the sediments. <br /> The light slurry acts to suspend the sediments in the well as the <br /> scratcher is slowly lowered to the bottom of the casing. (See Exhibit <br /> B) Once the light slurry has been injected to the bottom of the well , <br /> it is replaced by a dense cement/bentonite grout that displaces the <br /> light slurry and sediment mix to the surface. This provides a <br /> cement/bentonite seal along the entire length of the well . <br /> San Joaquin Local Health District seemed to have great confidence in <br /> the ability and experience of this particular driller. They felt that <br /> this proposal would adaquatly seal the well , however, to be on the <br /> safe side, they request that we tear perforations in the casing and <br /> pressure grout into the anular space. <br /> We would like to continue our recent rate of progress and would greatly <br /> appreciate your comments with regards to this matter. If you have <br /> any questions please contact Kurt Balasek or myself at (916) 920-3518. <br /> Sincerely <br /> L.A. Moldenhauer, L.S. ,P.E. <br /> cc: Dana Means, Southwest Hide Company, Operation Manager <br /> San Joaquin Local Health District <br />