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<br />` A S S O C I A T E S I N C
<br /> using a small backhoe and following installation of the pipelines, the trench was backfilled with
<br /> pea gravel
<br /> 6.1 Baseline Data Collection and Startup
<br />' Prior to the pilot system startup, groundwater monitoring was performed from each nested
<br /> piezometer pair including the pairs in each DDC well annulus and air sparge well AS 1, to
<br /> establish baseline conditions for the test The baseline sampling was performed on September 25
<br /> 1 and 26, 2001 This sampling consisted of field measurements for temperature and water level
<br /> Groundwater samples were collected for laboratory analysis of TPHg by EPA method 8015,
<br /> BTEX by EPA method 8020, and MTBE, TAME, ETBE, DIPS, and TBA by EPA method 8260,
<br /> and rhodamine WT dye concentrations prior to system startup
<br />' Additionally, dissolved oxygen was monitored in each well prior to the start up of the air sparge
<br /> test The laboratory reports and chain of custody forms are presented in Appendix D
<br /> Subsequent monitoring and sampling was performed periodically throughout the test These data
<br /> are summarized in Table 9
<br /> The pilot system was initiated on December 3, 2001 and concluded on January 3, 2002
<br /> (approximately 31 days) Well ASI was used to evaluate the site-specific radius of influence
<br /> created by a DDC well at the site On the first day of startup, a 1 33 percent solution of
<br /> rho damime WT dye was infected into AS as a tracer to evaluate the well's radius of influence
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<br /> 6.2 Pilot Test Monitoring Program i
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<br /> During initial system startup and each week thereafter, field measurements for groundwater
<br /> depth and dissolved oxygen were taken at the site These monitoring dates were December 4
<br /> 1 through December 7, December 11, December 17, December 27, 2001, and January 3, 2002
<br /> The groundwater depth was measured with an electronic water level probe The dissolved
<br /> oxygen concentrations were measured with a down-hole YSI Model 95 probe and meter Both
<br /> probes were decontaminated between each sampling point with an Alconox detergent wash and
<br /> tap water rinse
<br /> ' On December 11, December 17, December 27, 2001, and January 3, 2002, following the field
<br /> parameter measurements, water samples were collected for analyses This sampling was
<br /> performed from the piezometers and wells associated with ASI The wells and sampling points
<br /> included AS 1, AS 1(s), AS 1(d), PZ 1 a(s), PZ 1 a(d), and PZ 1 b(d) These samples were collected
<br /> using a disposable bailer The groundwater samples were transferred to appropriate sample
<br /> containers, labeled, and stored on ice in an insulated cooler Following collection, the samples
<br /> ' were transported under chain-of-custody documentation for chemical analysis Each sample was
<br /> analyzed for TPHg by EPA method 8015, BTEX by EPA method 8020, and MTBE, TAME,
<br /> ETBE, DIPE, and TBA by EPA method 8260 at Argon Analytical in Ceres, California and
<br /> rhodamine WT dye by Western Analysis in Salt Lake City, Utah The laboratory reports and
<br /> w 1163931reportslnfs doc 12
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