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' 22 January 1996 <br /> AGE-NC Project No. 95-0112 <br /> Page 3 of 5 <br /> ' 3.2 COLLECTION OF GROUND WATER SAMPLES <br /> Water samples were collected from each purged well using new disposable bailers. The samples were <br /> transferred into 40-m1 EPA vials preserved with hydrochloric acid and transported in a chilled <br /> container under chain-of-custody to Alpha Analytical Laboratories (AAL) in Ukiah, California. All <br /> samples were analyzed for TPH-g and for BTE&X in accordance with EPA methods 5030 and 602, <br /> respectively. <br /> 3.3 SOM VAPOR EXTRACTION/IN--SITU AIR SPARGING REMEDIATION SYSTEM <br /> The SVE system has been in operation at the site since 15 August 1995. As of 31 October 1995, the <br /> SVE system had operated a total of 1,440 hours, or about 80% of the time. During the initial 45 days <br /> \of operation, the SVE system operated approximately 40% of the time. Low oxygen concentrations <br /> impairing continuous combustion of the vapor extraction unit are believed to cause the unit to shut <br /> down, resulting in low operating hours during the initial phase. This phenomenon is typical for vapor <br /> extraction projects. <br /> During the first quarter of operation, the SVE system has been extracting an average of 70 cubic feet <br /> per minute(cf n)of vapor from RW-i. The IAS system, installed concurrently with the SVE system, <br />' utilizes a compressor-driven EnviroSparge system and sparges air into through the sparge points at <br /> a rate of approximately 12 cfm. <br /> 3.5. COLLECTION OF VAPOR SAMPLES <br /> A vapor sample was collected from the vapor inlet on 31 October 1995. The sample was collected <br /> in a 250-m1 Tedlar bag and transported in a cool container under chain-of-custody to Mc Campbell <br /> Analytical, Inc. (MAI) in Pacheco, California. The sample was analyzed within 48-hours for TPH-g <br /> rand for BTE&X in accordance with EPA methods 5030 and 602, respectively. <br /> r3.6. MASS CALCULATION OF RECOVERED PRODUCT <br /> The hydrocarbon mass removed during the operating period was calculated using the following <br /> .. ....equation:.._ _ : -,M— C•QQt <br /> where: M= cumulative mass recovered (kg) <br /> C =vapor concentration (kg/m') <br /> iQ = extraction flow rate (m'/hr) <br /> t = operational period <br />