Laserfiche WebLink
27 November 1996 <br /> AGE-NC-95-0112 <br /> ' Page 2 of 5 <br />' 22 COLLECTION OF GROUND WATER SAMPLES <br /> Water samples were collected from each purged well using new disposable bailers The samples <br />' were transferred into 40-m1 EPA vials containing 0 5 ml of 18%hydrochloric acid as a preservative <br /> and transported in a chilled container, under chain-of-custody, to Alpha Analytical Laboratories <br /> (AAL) All samples were analyzed for total petroleum hydrocarbons quantified as gasoline (TPH-g), <br />' and for volatile organics (benzene, toluene ethylbenzene and xylenes, BTE&X) with methyl- <br /> tertfary-butyl-ether (MTBE) in accordance vuith EPA methods 5030 and 602, respectively <br />' 2 3 SOIL VAPOR EXTRACTION/LV--SITU AIR SPARGING REMEDIATION SYSTEM <br />' The SVE system has been in operation at the site since 15 August 1995 Between 31 July 1996 and <br /> 30 October 1996,the SVE system operated a total of 1,400 hours, or about 64% of the time, bringing <br />' the total operating time up to 7,920 hours since the system was brought on-line Field data is <br /> summarized on fable 3 <br /> The SVE system extracts an az erage of 70 to 75 cubic feet per minute (cfm) of vapor from RW-1 <br /> during operation The IAS system, installed concurrently with the SVE system, utilizes a <br /> compressor-driven EnviroSparge system and sparges air through the sparge points at a rate of <br />' approximately 5 scfm on one hour cycles <br /> 24 COLLECTION OF VAPOR SAMPLES <br /> Vapor samples were collected from the vapor inlet to the extraction unit on 29 August, 30 September <br />' and 30 October 1996 Samples were collected in Tedlar bags and transported in a cool container <br /> under chain-of-custody to McCampbell Analytical, Inc (MAI) in Pacheco, California The samples <br /> were analyzed within 48-hours for TPH-g and BTE&X)n accordance with EPA methods 5030 and <br />' 602, respectively <br />' 25 MASS CALCULATION OF RECOVERED PRODUCT <br /> The hydrocarbon mass removed during the operating period was calculated using the following -: <br /> equation M = C•Q•t <br /> where M = cumulative mass recovered (kg) <br /> C = vapor concentration (kg/m') <br /> Q w extraction flow rate (m3/hr) <br />' t= operational period, in hours <br />