ARCHIVED REPORTS_XR0011788 - Laserfiche WebLink

Home Browse Search

Moore Petroleum 5491 F Street Banta,California Page 3 detected in soil samples collected from monitoring wells MW-2, MW-4 and MW-5 during the previous site investigations. Petroleum constituent concentrations were not detected in soil samples collected from monitoring wells MW-3 and MW-6. Based on these data,vapor extraction from MW-1 did affect the known extent of petroleum constituents in soil underlying the site. Ground water samples collected from monitoring wells MW-2 through MW-6 do not contain petroleum constituent concentrations. It is assumed that the vapor flow obtained during the vapor extraction test was sufficient to capture the known extent of petroleum constituents in ground water underlying the site. Vapor samples collected during the vapor extraction test indicated that petroleum constituent concentrations were relatively constant during the test. The first vapor sample was found to contain benzene at a concentration of 200 micrograms per liter(µg/1) and TPHg at a concentration of 13,000 gg/l. Petroleum constituent concentrations in the second vapor sample were 200 µg/l benzene and 13,000 gg/l TPHg, with minor variations in ethylbenzene and xylenes concentrations. Based on the vapor flow rates and the vapor sample analytical results the average hydrocarbon vapor extraction rate during the vapor extraction test was approximately 88 lb./day as TPHg;the average benzene extraction rate was approximately 1.4 lb./day. Copies of the analytical reports are contained in Enclosure A. Calculations leading to the above stated results are also contained in Enclosure A- 5.0 PROPOSED REMEDIATION SYSTEM 5.1 Proposed System Description The proposed remediation system will consist of a soil vapor extraction system(SVES), and an air sparging system The'SVES will consist of a vapor extraction blower and one vapor extraction well. The vapor extraction well will be 4-inch diameter vadose well screened from 6 to 13 feet below ground surface (bgs). The well will be located near monitoring well MW-1 as illustrated in Figure 3. To prevent the outward migration of petroleum constituents due to sparging, the SVES will be sized to capture air from the sparging well also. Vapors from the SVES will be treated to reduce petroleum constituent concentrations prior to release to the atmosphere. The design flow rate for the vapor extraction system is 100 scfm. Soil vapor will be directed through an air/water separator and particle filter prior to the vacuum blower. Discharge from the vacuum blower will be directed to a temporary thermal or catalytic oxidizer. Based on the results ERAO2.004CAP