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R911STATE OF CALIFORNIA DEUKMEJIAN,Governor <br /> CALIFORNIA REG -' s L WATER QUALITY CONTROL BOARD— MAY 2 0 1989 <br /> CENTRAL VALLEY iiEGION <br /> 3443 ROUTIER ROAD P /'!,�ONM NT. L HEALTH <br /> LTH <br /> SACRAMENTO,CA 95827-3098 , <br /> � /CER'JK""ELS <br /> 18 October 1989 <br /> Mr. Tom Horton <br /> San Joaquin County <br /> Department of Public Works <br /> P.O. Box 1810 <br /> Stockton, CA 95201 <br /> SUBCHAPTER 15 MONITORING PROGRAM IMPLEMENTATION, FOOTHILL LANDFILL, SAN JOAQUIN <br /> COUNTY, CASE NO. 1928 <br /> We received the Subchapter 15 Monitoring Program Implementation Report, dated <br /> 14 September 1989. Monitoring and Reporting Program No. 89-018 for Foothill <br /> Landfill requires the ground water surface elevation in all wells to be measured <br /> on a quarterly basis. This information is to be displayed on a water table <br /> contour map and/or ground water flow net for the site. This was not included <br /> in the monitoring report. The report is satisfactory, but there is a mistake <br /> in Table 1. The table lists the Top Of Casing (TOC) , Top of Perforations (TOP), <br /> and Bottom of Perforations (BOP) for LW-1 as 310.40 MSL. Table 2 lists the TOC <br /> for LW-1 as 310.40 MSL. What are the TOP and BOP for LW-1, or are they known? <br /> Is this well screened at several intervals? Are there any well logs in existence <br /> for this well? In the report you state that approximately 1500 gallons of water <br /> are removed from the well every 15 minutes (100 gpm) throughout the day. Is it <br /> possible that this amount of flow out of the well could cause a change in the <br /> direction of flow of the ground water? Has there been any study to determine <br /> how this extraction affects the local ground water gradient? The quarterly water <br /> table contour maps could help in determining if there is any effect. <br /> Please address the above questions by 15 November 1989. If you have any <br /> questions, please call me at (916) 361-5737. <br /> f <br /> falh Y K. TUCKER <br /> P Djject Engineer <br /> Waste Discharge To Land Unit <br /> cc: Mr. Alan Biederman, San Joaquin County, Public Health Services, Stockton <br /> Mr. Leonard Stefanelli , Waste Management Incorporated, San Jose <br /> Mr. Daniel Nomellini , Foothill Sanitary Landfill , Inc. , Stockton <br />