Laserfiche WebLink
CRYSTAL CREAMERY STOCKTON <br /> WKA No. 1628.10 <br /> February 5, 2000 <br /> Page 4 <br /> Air Sparging Pilot Test <br /> An air sparging pilot test was performed at the site on March 10, 2000. The air sparging test was <br /> performed to evaluate the feasibility of remediating adsorbed-and dissolved-phased petroleum <br /> hydrocarbons in the capillary fringe and saturated zone,and to determine the appropriate air sparge <br /> injection rate and pressure, and air sparge radius of influence for a treatment system. The <br /> equipment used to perform the test consisted of 1) a 3 horsepower air sparging blower used to <br /> inject atmospheric air; 2)instrumentation for measuring air flow rate, air pressure, dissolved <br /> oxygen and pressure differential (depth-to-groundwater), and 3) PVC piping, fittings, dilution <br /> valves and wellhead connections. The air sparging blower was used to deliver pressurized air <br /> below the water table. A Dwyer rotometer and pressure gauge were used to measure airflow rate <br /> and pressure at the air sparging well. <br /> The air sparging test was conducted for approximately 4 hours. Air spargink well AS 1 was used <br /> as the sparging well and wells AS2 and AS3 were used as the observation wells during the pilot <br /> test. Air sparging wells AS 1, AS2, and AS3 are two-inch diameter wells with 0.02-inch slotted <br /> casing. The screened interval of air sparging well AS 1 is 25 to 30 feet bsg and the screened <br /> intervals of wells AS2 and AS3 are both 15 to 30 feet bsg. The horizontal distances between <br /> sparging wells AS 1 and AS22 is approximately 20 feet and the distance between wells AS 1 and <br /> AS3 is approximately 10 feet. The following aboveground system performance parameters and <br /> in-situ responses were monitored during the pilot test: <br /> • Injection well flow rate <br /> • Injection well pressure <br /> • Water levels (dedicated pressure transducers) <br /> • Dissolved oxygen levels (periodic sampling of groundwater using a portable down-hole <br /> DO meter) <br /> • Dissolved TPH as gasoline, BTEX and oxygenate concentrations <br /> • Soil gas pressure(using magnehellic gauges). <br /> INK <br /> WALLACE•IC FI <br />