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CALIFORNIA GEOPHYSICAL GROUP, INC. <br /> P.O. Box 578341, Modesto, CA 95357 Tel: (209) 527-1247 <br /> March 22, 2006 1005 HAR 27 Pry I Fjt: (209) 527-4810 <br /> Shhi h; r,p;,,., <br /> Environmental Health Department r`-l:CTU.:UL <br /> TY <br /> San Joaquin County <br /> R TRENT <br /> 304 E. Weber Avenue, Third Floor <br /> Stockton, CA 95202-2708 <br /> Attn: Mr. Harlin Knoll <br /> Re: Amended Work Plan <br /> Beneto, Inc. Cardlock 10842 South Harlan Road, French Camp, CA <br /> Introduction <br /> CGG was on site with Mr. Harlin Knoll on February 10, 2006. He explained what had <br /> taken place with the previous work done by MB Environmental Geology. This was <br /> reported in their report dated January 11, 2005. We discussed the placement of the <br /> three monitoring wells that CGG will be drilling. <br /> SITE HISTORY <br /> On December 20, 2004, MB Environmental Geology performed a limited phase II <br /> investigation at this site. They drilled and logged five (5) borings. <br /> Scope of Work <br /> CGG plans to drill three monitoring wells on this site to analyze the distribution and <br /> depth of the soils impacted with the diesel from the tank south of this site. The wells will <br /> be drilled to a depth of 30 feet bgs. <br /> The drilling and well installation of the monitoring wells will be performed by Spectrum, a <br /> California licensed drilling company. These wells will be drilled using a hollow stem <br /> auger. Soil core samples will be taken every 5 feet of vertical drilling and a core will be <br /> taken as close to the capillary fringe as possible; also a core will be obtained and <br /> sampled at the bottom of each well. The samples will be sent to Argon Laboratories for <br /> testing of diesel. The drilling, logging and well installation will be logged and supervised <br /> by a Registered Geologist. <br /> All drill cuttings will be placed in steel sealed drums and left on site until we have the <br /> laboratory results and then removed and properly disposed. Also any purged water will <br /> be placed in drums and left on site and removed after the laboratory results. <br /> The wells will be constructed by placing a 2 inch schedule 40 pipe, screwed together <br /> from the bottom of the boring to the surface. The bottom 15 feet will be 0.02 inch slotted <br /> casing and the remainder will be blank casing. Number#3 sand will be placed opposite <br /> the slots and 2 feet above the last slot. Then a transitional seal of hydrated bentonite <br />