SITE INFORMATION AND CORRESPONDENCE

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stable at background readings over a period of two months, bioremediation is considered complete. We expect the process to require about eight months. Each month, all monitoring wells will be checked for the presence of free product, and the depth to product or to ground water will be measured using an electronic interface probe. Submit Work Plan Addendum When OVA readings in the TVMPs show significantly low to non-detectable levels of volatile organic hydrocarbon concentrations, we will submit an addendum to the original work plan describing the progress of the project and recommending confirmation sampling and testing-protocol for site closure. Soil and Water Sampling for Confirmation of Cleanup Following acceptance by the EHD and Water Board of the work plan addendum, we will collect soil and water samples as described in the addendum. If the confirmation sampling results qualify the site for closure in accordance with the accepted work plan addendum, we will meet with EHD and obtain permission to abandon the infiltration probes and monitoring wells. We will then abandon the probes and wells by splitting the PVC pipe and well screen and pressure grouting the borings with cement- bentonite grout. Submission of Application for Site Clo.myee We will submit the results of the confirmation sampling and infiltration probe and monitoring .well abandonment to the EHD and Water Board in an application for site closure. We trust this in the information you require. If you have any questions please call. Very truly yours, TRANS TECH CONSULTANTS Dr. Donald G. McEdwards, CE 28088, EG 1208, REA 735 Principal Hydrogeologist DGM\RAS:smc\02-01MOD.RAP Attachments: Monitoring Well Construction Diagram, Plate 1 Temporary Vapor Monitoring Point Diagram, Plate 2 Site Map, Plate 3 Distribution List December 15, 1994 Job No. 1278.02.01 - 5 -