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83 WEST MARCH LANE <br /> SUITE 12 <br /> STOCKTON,CA 95207 <br /> nM PHONE:(209)479.1835 <br /> AUlUMFIS X81GNER6WI8I1L1Mn <br /> January 21, 1993 <br /> Mr. Richard Callistro <br /> San Joaquin County Capital Projects <br /> 222 East Weber Avenue, Room 678 <br /> Stockton, CA 95202 Proposal No, P-93-0142-00 <br /> SUBJECT: Proposal for Quarterly Groundwater Monitoring <br /> Addendum to Proposal Dated June 24, 1992 <br /> Human Serti ces Agency Building <br /> Stockton, California <br /> Dear Mr. Callistro: <br /> Per our recent telephone conversation, ROY F. WESTON, INC. (WESTON) understands that <br /> the County wishes to proceed with quarterly groundwater monitoring of the wells installed by <br /> WESTON in the vicinity of the Human Services Agency Building in downtown Stockton. <br /> WESTON proposed such a program in June 1992 but the County was unable to authorize the <br /> work at that time. <br /> SCOPE OF WORK D1SCUSSYON <br /> The major elements of WESTON's previous groundwater monitoring proposal dated June 24, <br /> 1992 remain unchanged. However, there are several issues which may influence the scope of <br /> work which need to be addressed at this time. These issues are discussed below: <br /> 1. WESTON proposes the following revised sampling and reporting schedule: <br /> Analyses Quarter RUorl Due <br /> BTEX, TPH-G 1st (Jan - Feb - March, 1993) April 15, 1993 <br /> BTEX, TPH-G 2nd (April - May - June, 1993) July 15, 1993 <br /> BTEX, TPH-G 3rd (July - Aug - Sept, 1993) October 15, 1993 <br /> BTEX, TPH-G 4th (Oct - Nov - Dee, 1993) January 15, 1994 <br /> 2. WESTON originally proposed analyzing the water samples only for BTEX and TPH-G. <br /> WESTON still believes this analytical suite comprises an adequate monitoring program <br /> due to the historic absence or very low concentrations of TPH-D, EDB and Total Lead <br /> found in the wells during the initial sampling effort. However, it is possible that the San <br /> Joaquin County Environmental Health Division (F-HD) may require additional analyses. <br /> To cover this possibility, the additional cost per sample is shown in the cost estimate <br /> section of this proposal. <br /> St%C W ROP08ALtC1114f RO.MT <br />