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Moore Petroleum <br /> 5491 F Street <br /> Banta,California <br /> Page 2 <br /> It is important to note, the decrease in concentrations of total petroleum hydrocarbons, as <br /> gasoline(TPH-G), and benzene, toluene, ethylbenzene and total xylenes(BTEX)in MW-1 <br /> through MW-6. Tables 1 and 2 summarizes the previous and current groundwater conditions at <br /> the site. <br /> 3.0 CURRENT SITE REMEDIATION MEASURES <br /> 3.1 Floating liquid Hydrocarbon Recovery <br /> Previous to January 14, 1994, recovery of floating liquid hydrocarbons(FLH)from monitoring <br /> well MW-1 was done by use of a product skimmer. The skimmer was installed by Aegis on April <br /> 9, 1993. The total of FLH (and associated water)removed from the site to date is approximately <br /> 20 gallons. Apex personnel removed the skimmer on January 14, 1994, due to the absence of <br /> floating free product in monitoring well MW-1. <br /> 4.0 REMEDIATION TESTING <br /> L <br /> 4.1 Vapor Extraction Test <br /> On May 10, 1994, Apex conducted a short duration vapor extraction test to determine if vapor <br /> extraction is a remediation technology alternative for this site. The vapor extraction test consisted <br /> of connecting the vacuum side of a 2-horsepower regenerative blower to monitoring well MW-1 <br /> and applying a vacuum to the well. Flow, vacuum and concentration data were collected at <br /> regular intervals during the test. Two vapor samples were collected for laboratory analysis of <br /> BTEX and TPHg concentrations. <br /> Vapor flow during the test was estimated from the vacuum measurements obtained during the <br /> test. Based on vacuum measurements, the vapor flow varied from 70 to 80 standard cubic feet <br /> per minute(scfin)during the vapor extraction test. Vapor concentrations were also monitored <br /> with a photoionization detector(PID) during the test to observe changes in the vapor <br /> concentration. Concentrations measured with the PID varied from 80 to 100 ppm The PID is <br /> calibrated to an isobutylene standard. Data from the PID is used as an objective measure only. <br /> Vacuum data collected during the test, indicated a radius of influence of approximately 45 feet <br /> from monitoring well MW-1. This was determined by monitoring vacuum readings from <br /> monitoring wells MW-2, MW-4 and MW-5 during the test. Minor petroleum constituents were <br /> ERA02.004CAP <br />