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JJW GEOSCIENCES Inc. Genew E 9 Cam(CA Lk.7 WW) <br /> Envirammental Consultant Cls Ur<s G41b o A-mh*W ilz VOM(ELAP NO12) <br /> E inee�r Coneractor VM o`"C°" I047 Ucenu r7 &=) <br /> OSHA Cori a Asbestos Consul"(/02-0614) <br /> March 29, 1999 <br /> Mr. Piete Crosby <br /> P.C.To <br /> 11846 Cl ay Station Road <br /> Herald, CA - 95638 <br /> Subject: JC Trucking Site <br /> Stockton. California <br /> UST Cleanup Fund Claim#8509 <br /> Revised Cost EstImate to Install Two Deep Wells with Conductor Casings <br /> Dear Mr. Crosby: <br /> This cost estimate follows our discussion with both yourself and Ms. Lori Duncan of San Joaquin <br /> County Environmental Health concerning installation of two deep monitoring wells for the above- <br /> reference site. <br /> In Decerr ber 1998, we provided an estimate to install two deep monitoring wells as requested by <br /> San Joac uin County. However, our initial bid did not include installation of conductor casings, <br /> which isecessary in order to seal the first water bearing zone, thereby reducing the risk of cross <br /> contaminis <br /> tion. This is particularly important for this site, as we encountered high concentrations <br /> of containation in the soil and upper water bearing zone- Consequently, this revised cost <br /> estimates to install the two deep wells, both with Conductor casings. This rest estimate <br /> supersed our December 1998 cost estimate. A detailed breakdown of our costs is provided on <br /> the enclosed Revised Cost Estimate Worksheet. Also enclosed is a copy of our 1999 pee <br /> Schedule <br /> In addition to the conductor casings, we have included in this cost estimate time to drill one pilot <br /> hole. Th pilot hole will be drilled outside of the contamination plume to identify the thickness of <br /> the aqui rd separating the two water bearing zones. The identified aquilard thickness will then <br /> be used to determine the optimal depth to found the two conductor casings- further, the pilot <br /> hole will confirm whether in fad a second aquifer exists within 70 feet. Should the pilot hole fail <br /> to reveal a second aquifer within 70 feet, thea we will discuss our findings with San Joaquin <br /> County a id re-evaluate whether the deeper wells are needed. If the deeper wells are not <br /> installed, ur cost estimate will be adjusted accordingly. <br /> i <br /> RenCha Cal ctS7Va Sawh Ldke Tahoe Atascadero <br /> 11350 Momei Park Place. Rancho Cordova. CA 95742 Tekk, 916.853.8025 Fax; 916.853.8029 <br />