ARCHIVED REPORTS_XR0011776 - Laserfiche WebLink

Home Browse Search

Second Quarter 1997 Ground*ater Monitoring& Remediation Status Report Moore Petroleum,Inc.,5491 'T"Street,Banta,CA June?. 1997 Neel On May 5, 1995, a soil vapor extraction system consisting of an R.S.I. SAVE system was installed 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 consists of an internal combustion engine with catalytic converters mounted on the exhaust. The system was set up such that soil vapors could be extracted from either vapor well VNV-1 and/or monitoring well MW-1. The system was started on May 5, 1995, and has operated through October 4, 1995, at which time it was temporarily removed from site. On November 27, 1995, the system was returned to the subject site and restarted. An air sparge system was installed for use in conjunction with the vapor extraction system. The air sparge system consists of a one horse power electric motor which powers a 10-cubic feet per minute (CFM) oil-less compressor. The compressor injects air through an air sparge point located midway between VW-1 and MW-1 (Figure 2). The air sparge system was started on May 31, 1995 and operated intermittently through August 30, 1995, at which time its operation began to coincide with the operation of the R.S.I. system. v On April 29, 1997, Apex received permission from the San Joaquin County Environmental Health Division (SJCEHD) to shut down the air sparge and vapor extraction system due to low influent �.� soil vapor concentrations to the vapor extraction system. As of April 29, 1997, the remediation system has extracted a total of 1,730 pounds of total petroleum hydrocarbons (TPH), as gasoline, and 19.9 pounds of benzene. GROUNDWATER MONITORING Groundwater Levels On April 29, 1997, Apex personnel collected groundwater-level measurements from all six monitoring wells in accordance to the Apex Standard Operating Procedures (SOP) included as Appendix A. All groundwater elevations (except well MW-3, which is awaiting re-surveying) were measured to the nearest 0.01 foot, referenced to the surveyed top-of-casing elevations. Groundwater level measurements collected since January 1993 are summarized in Table 1. A potentiometric surface map of the shallow water-bearing zone on April 29, 1997, is shown on Figure 3. Groundwater Sampling and Analysis 3 A letter dated April 29, 1997 from the SJCEHD, included as Appendix C, stated that they concurred with Apex's recommendations to reduce the sampling of the monitoring wells to annually, with the exception of wells MW-1 and MW-4, which will still be monitored on a quarterly basis. On April 29, 1997, Apex personnel collected groundwater samples from