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1 <br /> Eka. <br /> . Mr James L Barton <br /> 1 July 28, 2005 <br /> Page 4 <br /> 1 Request for Reduction in Soil Vapor Sampling <br /> ENSR collects vapor samples for laboratory analysis from select vapor extraction wells on a <br /> quarterly basis This sampling is not required under CAO No 5-00-707 The highest <br /> concentration of TPHg collected from a sal vapor sample from the second quarter sampling <br /> 1 event was 2 9 pg/L at VEW-3 The samples were collected on May 26I' while the water table <br /> was experiencing a seasonal low depth and is representative of a period when the extraction <br /> well screens are exposed and less saturated than during winter months As a result of repeated <br /> 1 low concentrations of petroleum hydrocarbons in soil vapor samples, ENSR requests reducing <br /> the SVE well summa canister sampling to an annual event and requests that the sampling occur <br /> 1 during the second quarter of each year ENSR will continue to monitor the AS and SVE wells <br /> regularly with field instruments <br /> 1 Remarks/Signatures <br /> The interpretations in this letter represent the professional opinions of ENSR and are based, in <br /> 1 part, on information supplied by the client These opinions are based on currently available <br /> information and are arrived at in accordance with currently accepted hydrogeologic and <br /> 1 engineering practices at this time and location Other than this, no warranty is implied or <br /> intended <br /> 1 <br /> 1 <br /> 1 <br /> J 1ProiectsW6940098 293morlanglReportslLetter Requesting Reduction in SampirngM98 Lefter Requesting Reduction in Sampling doc <br /> Celebrating 35 Years of Excellence in Environmental Services <br />