ARCHIVED REPORTS_XR0011843 - Laserfiche WebLink

Home Browse Search

r. i On May' 5, 1995' a soil vapor extraction system consisting of an R.S.I. SAVE system was j 1 installed at-the subject site. -The vapor extraction system was installed per-Sari Joaquin Valley Unified Air''Pollution Control,District (SNUAPCD) Permit conditions. The vapor extraction system consists of an internal combustion engine with catalytic converters mounted on the exhaust. The system.was configured such that soil vapors could be extracted from either vapor I ' well VEW-1- and/or monitoring well MW-1: The system.was started on May 5, 1995, and operated through October 4, 1995, at which time it was temporarily removed from the 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 ZK air sparge system consisted of a one horse power electric motor which powers a 10-cubic feet per.,.- minute er minute (CFM) oil-less compressor.' The compressor injectedair through an air sparge ,point located midway between VEW-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. r On April 29,'1997, Apex received permission-from the San Joaquin County Environmental Health ' Division (SJCEHD) to shut dawn.theair spargeand vapor extraction system.due to low influent," (' soil-vapor concentrations-to the vapor extraction system. As of April 29, 1997, the remediation a system has extracted a total of 1,730 pounds of total,petroleum hydrocarbons (TPH), as gasoline, L. ' and 19.9.pounds of benzene. :.. Apex submitted the Over Excavation & Groundwater Removal Workplan dated September.10, 1997; proposing over excavation, de-watering and sampling of the bulk,loading rack and tank ' basins dur'i'ng the nine UST removals: Apex supervised the,removal of-two. .350 gallon USTs, T-8 and .T.-9 (kerosene and" cleaning r solvent, respectively) on August,17, . 1998 and.September. 8," 1998, 'respectively. Also, seven 10,000 gallon UST§ were removed on September 8, 1998. Results of the UST removal.were documented by Apex in the'report titled. Tank Closure Results.and Recommendations Report dated December 23, 1998. Following the removal of T-9, soil was over excavated-and an exploratory trench was dug: Apex a collected two soil samples and one groundwater sample from the over excavation and exploratory trench.. One soil sample was collected from,beneath T-8. After the removal of the seven 10,000 gallon USTs, Apex collected four, soil samples and one groundwater sample. Apex then collected six additional soil sarriples and to additional water samples from beneath the tank basin. Nine, soil samples were submitted for analysis from the area beneath the former bulk loading rack. The results of all soil and water sampling were documented in the report entitled Tank Closure Results and Recommendations Report.dated December 23, 1998. " On April 8"and 9, 1999, Apex personnel supervised the advancement of eight Geo Probes at the, .� subject property. The results of all soil and water sampling were documented in the report entitled .