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, � �_ <br /> xl <br /> d <br /> #049 P'01 1 <br /> Geo4�*d2'echnics <br /> `Dwm,CX min E'+�T���Spectaltirr <br /> November 27,1989 <br /> Project No.: GT-51 <br /> LL <br /> f <br /> NOV 2 1989 <br /> Mr. Robert Barenchi ENVi20NMENTAL HEALTH <br /> R&B Trucking <br /> 1785 N. Corral Hollow Road i <br /> Tracy,CA 95376 <br /> RE; ADDENDUM NO.1 <br /> PHASE I PRELD-UNARY SITE ASSESSMENT WORK PLAN <br /> R 6c B TRUCIONG <br /> 1785 NORTH CORRAL HOLLOW ROAD <br /> TRACY,CALIFORNIA <br /> Dear Mr. Barenchi, <br /> In response to comments in Thomas Peltier's(CRWOctober <br /> 89, <br /> regarding our firm's preliminary site assessment work p an, II)havte prepared thllow ng <br /> addendum. R+ <br /> The main concern Mr.Peltier expressed was that a minimum of threemonitoring wells s))6uld be ' <br /> installed at R& B Trucking during this phase of work instead of only one that was initialIy <br /> proposed. Two reasons were given for this: 1)to determine onsite ground water gradient and,2) <br /> because one well may not be adequate to evaluate the ground water for the presence of <br /> petroleum hydrocarbons. <br /> We agree with the reasoning of Mr.Peltier, therefore,we are proposing to install two <br /> additional monitoring wells. The location of two of the additional wells is shown on the <br /> attached property map. Due to the future plans for using this property for residential housing, <br /> the location of these wells have been chosen to have the least interference during the <br /> development of this property. 4 <br /> t4 <br /> The wells will be constructed as described in the preliminary site assessment work pan except <br /> that a minimum of 3 feet of granular bentonite seal will be placed above the filter pack, beforey ,l <br /> the annular space is filled with cement grout. Each well will be developed, samples collected, <br /> and tested as described in the work plan. Well permits will be obtained before these wells are <br /> installed. r <br /> P <br /> ��� ��*«+i•`;1 R f.: a,x< - - � � r } �c r y .1 w '- ^f. d'`" �_ -X' x <br /> - <br /> n <br /> . .' <br />