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Mr Chuck Carmel August 15, 1994 Page 4 i Recommendations Based on the operation of the SVETS. during the first quarter of 1994, the SVETS will continue to operate However, Brown and Caldwell proposes that due to the decline in soil vapor influent concentrations to the catalytic oxidizer and the lack of groundwater contamination at the site, the biofilter system be permuted to remediate the remaining low soil vapor concentrations at the site As an interim measure, Brown and Caldwell will continue to optimize the operation of the current SVETS to maximize removal rates and decrease the concentration of petroleum hydrocarbons in the soil vapor beneath the site Brown and Caldwell further proposes the drilling of soil borings to confirm that soil and groundwater contamination beneath the site has been addressed and the site is ready for closure A work plan describing the details of this dnlling and sampling was submitted to the County on March 23, 1994 The well cap on well W-5 does not fit properly Brown and Caldwell suggests cutting the well head to ensure proper tit and resurveying the well Proper well cap fit will prevent contaminants from entering the well from an outside source SUMMARY OF WORK Work Completed First Quarter 1994 • Continued monitoring SVETS and optimized system performance • Prepared and submitted fourth quarter 1993 groundwater monitoring and remediation system evaluation report • Sampled site groundwater monitoring wells for first quarter 1994 Sampling performed by GTI Prepared San Joaquin Au Pollution Control District reports detailing operation and destruction removal efficiency of the SVETS • Requested and received approval to discontinue Wastewater Discharge Permit No 151 Effluent piping from the GWETS was disconnected from the industrial sewer on March 28, 1994 . Use or disclosure of data contained on this sheer is subject to the restriction specified at the beginning of this dociunew 13181REPORTS11Sr94QTR RPT