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Mr. Michael T. Feeley February 9 Page 2 WORKPLAN .l FOR THE CLOSURE O WASTE MANAGEMENT is FORWARD LANDFILL, STOCKTON, CA ITEM 1 Definition of aquifer characteristicl The underlying aquifer at the Forward Landfill has been characterized in detail in the Response to the Notice of Deficiency submitted by EBA on behalf of Forward, Inc. in April of 1988. The geologic investigations performed for this report, as well as the information obtained during the drilling of the new wells on the site, has provided detailed information of the underlying geology and hydrogeology. Quantitative information pertaining to the vertical interconnection of the different zones of the aquifer at the site will be collected by performing a pump test on the paired wells 7 and 8. Water will be pumped from the deep well and the shallow well will be monitored for any water level changes. The hydraulic conductivity of the upper and lower zones will be determined by slug tests on wells 7 and 8. Rather than introducing a known volume of water into the wells, a decontaminated pipe of known volume will be placed in the deeper wells to displace the water level. The required pump and slug tests will be performed and the required evaluation will be completed not later than April 15, 1989. I ft -4-1"- •. • • • • The wells at the Forward landfill are screened at a depth to provide acceptable samples and measurements throughout the year with the exceptions of several wells. As seen in the monthly ground water measurements taken by Kleinfelder and Associates, four wells, namely M-2, 5, 7, and 11, were found to contain insufficient water to adequately sample. Of these wells, MW -2, a damaged well, was abandoned and MW -5 has been replaced with the deeper well, MW - 5A.