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WESTERN 1386 EAST BEAMSR STREET <br /> WOODLAND CA 95776-6003 <br /> GEO-ENGINEERS (530)668-5300, <br /> FAX(530)662-0273 <br /> REGISTERED GEOLOGISTS wege@caE.Ret <br /> Ms.Lisa Medina June 1,2012 <br /> Leaking Underground Fuel Storage Tank Program <br /> San Joaquin County Public Health <br /> Environmental Health Division (PHS-FHD) <br /> 600 East Main Street <br /> Stockton,CA. 95202 <br /> (209)468-3455 <br /> RE: Amended Work plan for Site Restoration, destruction of excavation well MW 10 at former <br /> Sanchez property located at 1876 Country Club Blvd., Stockton, California 95203. <br /> Dear Ms.Medina: <br /> ]INTRODUCTION <br /> The work plan to destroy the wells associated with this site was approved in correspondence from <br /> Mr. Michael Infurna on February 6, 2012, with modification to the destruction of the excavation <br /> well MW 10, which was originally proposed to be pressure grouted, due the installation of the well <br /> into the pea gravel backfill of the excavation area. Mr. Infurna along with Mr. Nuel Henderson <br /> determined that the well nee -t4 be over drilled, by first setting conductor casing or sonic casing <br /> over the well to the 28 foot depth, drill out the well to the 28 foot depth, pressure grout the bottom <br /> 24 —28 foot depth, place pea gravel backfill as the conductor or sonic piping is removed. Remove <br /> the surface vault and place compacted road base to within 4 inches of surface and seal the surface <br /> with asphalt. <br /> Only two drilling contractors contacted can perform the conductor and/or sonic placement to drill <br /> out the well contents. Both contractors estimated the cost for destroying MW 10 over $6,000.00 <br /> and an entire day, which does not include Western Geo-Engineers time for supervision and health <br /> and safety. The budget to destroy the wells and restore the site was presented to the UST fund in <br /> .May of 2011 for the fiscal year 2011/2012 and did not anticipate the placement of conductor casing <br /> and drill out of the well. j <br /> i <br /> A seemingly more cost effective and adequate method of destroying MW 10 is proposed. To not <br /> over drill the well (not disturbing the pea gravel). Cut the exposed casing in the well vault, flush <br /> with the floor of the vault. Backfill the well with bentonite chips, allow the chips to hydrate for 24 <br />