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1 <br />i <br />4.0 SOLID WASTE ASSESSMENT TEST SUMMARY <br />The SWAT monitoring program is discussed and the results of the chemical analyses <br />are presented and evaluated in this section. <br />4.1 SWAT MONITORING PROGRAM <br />Water quality at the Corral Hollow Sanitary Landfill was evaluated by reviewing <br />historical analytical data from a previous ground -water exploration program (EMCON, <br />January 1988), and assessing data obtained from sampling and analyses performed <br />specifically for this SWAT program. The monitoring locations included in this SWAT <br />program are shown on Drawing 1. <br />The proposed SWAT monitoring program was discussed in the EMCON report entitled <br />Solid Waste Assessment Test Proposal and Ground -Water Monitoring Plan: Corral <br />Hollow Sanitary Landfill (EMCON, February 1988). This report was submitted to the <br />California Regional Water Quality Control Board (RWQCB) for approval. RWQCB <br />comments were received March 9, 1988. A conference call on March 16, 1988 and a <br />subsequent meeting on April 1, 1988 between representatives from the RWQCB, the <br />County of San Joaquin, and EMCON resolved the RWQCB concerns. <br />4.1.1 Monitoring Wells <br />Five ground -water monitoring wells were included in the SWAT proposed monitoring <br />system: three to monitor the deep regional ground water and two to monitor shallow <br />perched ground water. MW -1, installed at the eastern edge of the landfill during a <br />previous program (EMCON, January 1988), functions as the deep downgradient well. <br />MW -2 and MW -3 monitor the deep regional ground water upgradient from the landfill. <br />MW -2 is located near the southwestern corner of the site, adjacent to Corral Hollow <br />Road. MW -3 is located near the northern edge of the landfill. MW -3 had originally <br />been intended to function as a downgradient well, based on regional ground -water flow <br />information available before the wells were installed. MW -4, MW -5, and SB -1 are <br />shallow wells which monitor perched ground water conditions. MW -4 is located <br />adjacent to MW -1, and MW -5 is located adjacent to MW -3. As shown on Drawing 1, <br />STL 9390314 16 n0 <br />