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I y 1 04 March 1996 AGE-NC Project No 95-0144 Page 4 of 18 r - 4.0. IN-SITU AIR SPARGING PILOT TEST ' 41 PROCEDURES 4 1,1 SYSTEM INSTALLATION AND SETUP From 02 February to 07 February 1996, an in-sau air sparging (IAS) pilot test was performed at the r site This pilot test was performed to provide data for the feasibility of air sparging as a remediation ' method at the site Two sparging wells were installed at the site on 25 January 199C(Section 3 0) PVC piping was installed from a temporary'air compressor to the two wells On 02 February 1996, compressed air was supplied to the two IAS wells at a pressure of approximately 15 pounds per square inch(psi) The pressure was increased from 05 February to 07 February to approximately 20 sparging Approximately 5 to 7 psi was required to overcome the water column in the spargg wells t , ' For the IAS pilot test, wells MW-1, MVV-2,MW-4, MW-5 and MW-18 were utilized for observation points ,Each well was fitted with air-tight well caps, valves and tubing for monitoring pressure/vacuum and organic vapors in each well r ' 4 1 2 COLLECTION OF BASELINE GROUND WATER SAMPLES ,On 30 January 1996, ground water samples were collected from monitoring wells MW-1, MW-4 and ' MW-5, following the procedures outlined in Section 5 0 Samples were transported under chain-of- custody to MAI and analyzed for TPH-g and BTE&X in accordance with EPA methods 5030 and 602 and to Alpha Analytical Laboratories (AAL) in Ukiah, California and analyzed for dissolved iron in accordance with EPA method 236 1 Samples were collected to piovide baseline concentrations immediately before the IAS test ' Upon completion of the IAS test, ground water samples were collected from each well at the site as a part of the standard quarterly ground water monitoring (see Section 5 0 ) ' 4 1'3 FIELD MEASUREMENTS AND DATA COLLECTION Induced pressure, organic vapors, ground water depth and dissolved oxygen were measured at MW- ' 1, MW-2, MW-4 and MW-5 throughout the test Measurements were also collected at M-XV-18 during the startup and middle of the test Induced pressure was measured at each well using ' Magnelielic differential pressure gauges, organic vapor`s were measured at each well head using a r photo-ionization detector(PID), ground water depth was measured using a Sohnst water'level meter, and dissolved oxygen was then measured using a YS1 Model 55 dissolved oxygen meter Afler collection of measurements, the air-tight well cap was replaced at the end of each monitoring pet iod I