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STATE OF-ALIFORNIA GEORGE DEUKMEJIAN,Governor <br /> C..IFORNIA REGIONAL Wl i QUALITY CONTROL BOARD <br /> CENTRP=L VALLEY REGION -� <br /> 3443 FAUTIER ROAD x <br /> SACRAMENTO,CA 95827-3098 <br /> OCT 01 0 199 <br /> 18 October 1988 <br /> PERM11 <br /> Mr. Robert C. Karfoil, P.E. <br /> Water Quality Advisor <br /> Pacific Gas and Electric Company <br /> P.O. Box 7640 <br /> San Francisco, CA 94120 <br /> SITE INVESTIGATION WORKPLAN, GROUND WATER MONITORING WELLS AND <br /> SOIL SAMPLING, PG&E TRACY FORMER MANUFACTURED GAS PLANT SITE, <br /> TRACY, SAN JOAQUIN COUNTY - 5DZ e. GR46Qsf'l 06 .1 �h <br /> We have reviewed your workplan to install up to four ground water <br /> monitoring wells at PG&E Tracy Former Manufactured Gas Plant <br /> Site. Additionally, the workplan calls for up to 31 soil core <br /> borings to be drilled within the property boundaries. Soil <br /> borings will have an approximate depth of ten feet. Three <br /> monitoring wells will have an approximate depth of 25 feet and <br /> one deep well will have an approximate depth of 50 feet. Well <br /> screen locations will be based on lithology. <br /> In our 17 October 1988 telephone discussion, the following <br /> adjustments to the workplan were agreed upon: <br /> 1. PG&E will install four (4) inch ground water monitoring <br /> wells instead of two (2) inch wells. <br /> 2. After groundwater monitoring wells have been developed <br /> and stabilized, PG&E will determine whether to use a pump <br /> test or perform slugs test on the wells. PG&E shall <br /> consult with the Board on this decision and the factors <br /> used to make the determination. <br /> 3. Ultimate disposal of the wastewater generated by <br /> development of the wells and by any aquifer test will be <br /> based on its' level of contamination. Once the <br /> wastewater has been characterized, PG&E will propose a <br /> disposal option after its consultation with the Board. <br /> 4 . We recommend that the monitoring wells be surveyed and <br /> the hydraulic gradient determined monthly. Once these <br /> readings are determine to be relatively constant, <br /> quarterly reporting of these readings will be <br /> sufficient. <br />