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k" KLEINFELDER <br /> August 12, 1988 ,:'yf ; ; <br /> File: 24-2029-04 <br /> ENVIRONENTAL HEALTH <br /> FERMIT/SERVICES <br /> Mr. Al Olsen <br /> Environmental Health <br /> San Joaquin Local Health District <br /> 1601 E. Hazelton Avenue <br /> Stockton, CA 95205 <br /> SUBJECT: Grout Procedure Used to Backfill Cone Penetrometer Test Holes <br /> Dear Mr. Olsen: <br /> Kleinfelder engaged VBI In-situ Testing Technologist of Oakland, California, to perform <br /> cone penetrometer testing at the Cove Contractors' site on July 25, 1988. The site is <br /> located at 3242 South El Dorado in Stockton, California. <br /> Four cone penetrometer tests penetrated native materials and ground water below the site <br /> and were subsequently backfilled with a cement/bentonite grout mixture using a tremie <br /> grout system. The hollow drive rods were used as the tremie conductor system and a grout <br /> pump on the drill rig was used to force the grout through the conductor system. The drive <br /> rods were pushed down the test hole with a dummy cone instead of the electronic cone tip. <br /> The dummy cone is forced off the end of the drive rods when the grout is pumped down the <br /> drive rod/conductor system. The drive rods are withdrawn as the grout is pumped into the <br /> test hole. This procedure was used to grout the test hole from the bottom to the surface. <br /> Several other cone penetrometer test holes were attempted but were stopped by subsurface <br /> obstructions 1 to 5 feet below the surface. These test holes were not backfilled with grout <br /> as they did not contact native materials or ground water, the 2" diameter holes were <br /> backfilled with surface materials to restore the opening in the surface to original <br /> conditions. <br /> Please call if you have any questions about the work performed on July 25, 1988. <br /> Sincerely, <br /> INFELDER <br /> Dave Stavarek <br /> Staff Geologist <br /> Environmental Services Division <br /> Central Valley Group <br /> DS:rmm <br /> 131-88-1452 <br /> KLEINFELDER 9795 Business Park Drive, Suite C, Sacramento, CA 95827 (916) 366-1701 <br />