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t 5-1 5.0 PROBLEM ASSESSMENT ' Based on the analytical data collected and physical observations made during the Phase R ' Investigation, Remcor makes the following recommendations for additional investigation and remediation of the Former UFT Area 5 1 ADDITIQNAL INVESTIGATION ' Based on potential requirements by the San Joaquin County Environmental Health Division to further define the perimeter of soil and ground water impacted by the former UFT by estab- hshmg a "zero line" of impact, Remcor recommends that an additional investigation be per- formed A Site Contamination Work Plan (SCW) should be developed and submitted to San Joaquin County detailing the additional investigation The SCW should include the following tasks • Advance soil bonngs for collection of soil samples to define the lateral extent of soil impact in all directions and analyze soil samples for BTEX, TPH-purgeable fuels as gasoline, and lead • Perform a hydropunch exploration survey to define the lateral extent of shallow ' ground water impact in all directions and analyze ground water samples for BTEX ' • Install three "deep" monitoring wells to a depth of 50 feet to assess the vertical extent of ground water impact in the saturated zone and analyze ground water samples for BTEX, TPH-purgeable fuels as gasoline, and total and dissolved ' chromium and lead • Collect ground water samples from existing Monitoring Wells MW-1, MW-2, ' MW-3, MW-4, MW-5, and MW-6 and analyze for semxvolatile organic com- pounds (SVOCs) and total and dissolved chromium and lead. The ground water sampling should be performed using a low-flow pump that will reduce the tur- bidity of the samples to allow for evaluation of chromium and lead concentrations in the ground water. ' • Install one pumping well and conduct a 72-hour pumping test. The pumping test data would then be evaluated to determine hydraulic parameters of the aquifer 29025 ' "REALISTIC SOLUTIONS FOR HAZARDOUS WASTE PROBLEMS" �=w"t