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l7 <br /> Mr Chuck Carmel <br /> September 7, 1994 <br /> Page 4 <br /> from 1800 ppmv in 1992 to below 300 ppmv at the end of 1993 The influent concentrations <br /> have required below 300 ppmv since December 1993 and are continuing to decline As an <br /> interim measure, Brown and Caldwell will continue to optimize the operation of the current <br /> SVETS to maximize removal rates and decrease the concentration of petroleum hydrocarbons <br /> in the soil vapor beneath the site <br /> Brown and Caldwell further proposes the drilling of soil borings to confirm that soil and <br /> groundwater contamination beneath the site has been addressed and the site is ready for <br /> closure A work plan describing the details of this drilling and sampling was submitted to the <br /> County on March 23, 1994 <br /> The well cap on well W-S does not fit properly Brown and Caldwell suggests cutting the <br /> well head to ensure proper fit and resurveying the well Proper well cap tit will prevent <br /> contaminants from entering the well trom an outside source <br /> SUMMARY OF WORK <br /> . Work Completed in Second Quarter 1994 <br /> • Continued monitoring SVETS and optimized system performance <br /> • Prepared and submitted first quarter 1994 groundwater monitoring and remediation <br /> system evaluation report <br /> • Sampled site groundwater monitoring wells for second quarter 1994 Sampling <br /> performed by GTI <br /> • Prepared San Joaquin Air Pollution Control District reports detailing operation and <br /> destruction removal efficiency of the SVETS <br /> Work Anticipated During Third Quarter 1994 <br /> • Continue monitoring of SVETS and optimization of system performance <br /> • Preparation and submittal of second quarter 1994 groundwater monitoring and <br /> remediation system evaluation report <br /> Use or disclosure of data contained on this sheet is subject to the restriction specified at the beginning of this <br /> document <br /> 131MEPORTS\2ND94QTR RpT <br />