ARCHIVED REPORTS_XR0005703 - Laserfiche WebLink

Home Browse Search

Mr Michael Infurna July 21,2006 Page 2 issued from the San Joaquin Valley Air Pollution Control District for operation of the SVE system To conduct the SVE and AS/SVE pilot test, two VEWs consisting of 60-feet deep wells designated VEW-1 and VEW-2,were installed in the area of the former UST VEW-1 was located approximately 20-feet east of monitoring well MW-1,in the center of the source area, and VEW-2 was located approximately 20-feet south east of VEW-1 Figure 2 shows the location of these wells and Table 1 provides the well construction details,while boring logs for VEW-1 and VEW-2 are included in Attachment A The drilling and installation of these wells was conducted on March 13,2006 using a truck mounted hollow-stem auger drilling ng equipped with 10-inch diameter hollow stem augers The wells were completed with 3-inch diameter schedule 40 polyvinyl chloride (PVC) The screen was completed using 0 020-inch slot screen from 20-feet below ground surface (bgs) to 60-feet bgs Well MW-1 was purged and sampled prior to starting the SVE pilot test and following shut down of the AS/SVE test The well was sampled for total petroleum hydrocarbons in the gasoline range (I'PH/g),benzene, toluene, ethylbenzene,and total xylenes (BTEX), and fuel oxygenates by EPA method 8260 The samples were submitted to Kiff Analytical,an EPA-certified analytical laboratory located in Davis, California for analysis A chain-of-custody form was used to record possession of the samples from time of collection to arrival at the laboratory Chain-of-custody forms and groundwater analytical results are included in Attachment B The SVE-only pilot test was performed on May 3,2006 for approximately eight hours A gas-fired thermal/catalytic oxidizer with a 10-horsepower (hp) rotary lobe vacuum pump rated at 250-cubic feet per minute (cfm) at 10-inches of mercury (in Hg) vacuum was utilized to extract soil vapor from the wells The vacuum blower creates an airflow and induced vacuum in subsurface soil to volatilize organic compounds The vacuum pump was connected to the well casing of VEW-1,and a flow meter, sample port,and pressure gauge were connected in-line Air emissions from the SVE test were treated using the thermal/catalytic oxidizer to provide combustion of hydrocarbons at 1,400 degrees Fahrenheit The AS-only pilot test was performed on May 4,2006 A 5 hp compressor providing 23 cfm at 100-pounds per square inch (psi) was used to blow air into a • two foot screen placed ten feet below the water level in the existing well MW-1 P\28000\128253-T&T Z ruck.tng SVE\Documents\SVL Report amw dot