ARCHIVED REPORTS_XR0005636 - Laserfiche WebLink

Home Browse Search

rt ,r First Quarter 1997 Groundwater Monitoring Report • Moore Petroleum, 14800 W Frontage Rd,Manteca,CA March 27, 1997 Page 2 Int']. Spray Aeration Vapor Extraction (S AVE ) system at the subject site The vapor extraction _ system was installed per San Joaquin Valley Unified Air Pollution Control District (SJVUAPCD) permit conditions The vapor extraction system consisted of an internal combustion engine with catalytic converters mounted on the exhaust pipe To date, the vapor extraction system has extracted approximately 2,390 lbs of TPH, as gasoline, and 7 S lbs of benzene On January 23, 1995, Emcon started a groundwater treatment system at the subject site The groundwater treatment system was pneumatically operated via compressed air supplied from the R S I unit and extracted groundwater from monitoring wells MW-1, MW-2, MW-3 and MW-4 Once the groundwater arrived in the remediation compound via V diameter PVC piping, it was filtered through two in-line particulate filters and then through two in-hne, 400 lb carbon vessels Upon discharging from the carbon vessels, it was reinjected through two reinjection wells, RW-I and RW-2, located to the west of the remediation compound(Figure 2) To date, the water treatment system has extracted 1 8 pounds(lbs ) of TPH, as gasoline, and 0 37 lbs of benzene On November 27, 1996, Moore Petroleum received a letter from San Joaquin County Environmental Health Division giving their approval to shut down the groundwater treatment system and the vapor extraction system due to low system influent concentrations GROUNDWATER MONITORING Groundwater Levels On February 19, 1997, Apex personnel collected groundwater-level measurements from monitoring wells MW-1 through MW-9 (Figure 2) All groundwater elevations were measured to the nearest 0 01 foot, referenced to the surveyed top-of-casing elevations and conducted according to the Apex Standard Operating Procedures (SOP) included as Appendix A Groundwater level measurements collected since April 1992 are summarized in Table 1 Figure 3 is a potentiometric surface map of the shallow water-bearing zone on February 19, 1997 Groundwater Sampling and Analysis On February 19, 1997, Apex personnel collected groundwater samples from monitoring wells MW- 1 through MW-9 The station's domestic well(DM-1) and the domestic well of a trailer park located to the south of the subject site (DM-2)were also sampled on February 19, 1997 All samples were submitted, under chain-of-custody, to Sparger Technology, Inc , of Sacramento, California, a state-certified analytical laboratory All samples were collected according to the Apex SOP included m Appendix A The groundwater samples from the nine monitoring wells and the domestic well(DM-2)were analyzed for total petroleum hydrocarbons(TPH), as gasohne, benzene, toluene, ethylbenzene and total xylenes(BTEX)by EPA Method 8020/8015 • Groundwater samples collected from monitoring wells MW-1 through MW-5 and the domestic