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1 <br /> INANKER$ p[$GNEf6�iM15 <br /> wells Subsequent quarterly groundwater monitoring results indicated that the highest <br /> concentrations of hydrocarbons were present in downgradient monitor wells MW-7 and MW-8 <br /> Following the Phase II investigation, monitor wells MW-2 and MW-3 went dry due to a <br />' subsidence in the regional groundwater table These wells were abandoned and replaced with <br /> deeper wells (MW-2A and MW-3A) in 1995 during the Phase III investigation. Soil samples <br /> were collected from the bore holes of the new monitor wells During the installation of monitor <br /> well MW-2A, free product was observed in soil and groundwater Petroleum hydrocarbons <br />' were not detected in soil or groundwater samples collected from monitor well MW-3A <br /> The general approach for the Phase IV investigation was discussed in a meeting held on 12 <br />' January 1996 with Ms Mary Ways of the San Joaquin County Public Health Services <br /> Environmental Health Division (EHD) <br /> 1.2 SCOPE OF WORK <br /> The scope of the Phase IV investigation includes 1) obtaining permits for the work, 2) notifying <br /> a utility locating service to ensure that buried utility lines near the proposed boring locations are <br /> clearly marked, 3) conducting a geophysical survey to clear boring locations of subsurface <br /> obstructions, 4) installing groundwater monitor well MW-9 and completing soil boring BH-13, <br /> 5) collecting soil samples from the new monitor well bore hole and from one additional bore <br /> hole (BH-13), 6) collecting a grab groundwater sample from boring BH-13, and 7) preparing <br /> a report of findings and conclusions of subsurface conditions at 145 South Sutter Street. <br /> As agreed during the 12 January 1996 meeting, the scope of the Quarterly Groundwater <br /> Monitoring program includes the collection of groundwater samples on the following schedule <br /> First Quarter MW-2A and MW-9 <br /> Second Quarter MW-2A, MW-3A, MW-4, MW-6, MW-7, and MW-9 <br /> Third Quarter MW-2A and MW-9 <br /> Fourth Quarter MW-2A, MW-3A, MW-4, MW-5, MW-6, MW-7, and MW-9 <br /> A report of the findings and conclusions of groundwater conditions at the site will be issued <br /> following each quarterly groundwater monitoring event These reports will include summaries <br /> of all analytical results <br /> UPROjECTS%SAN10Q\HSA%VP 2 <br />