ARCHIVED REPORTS XR0009894 - Laserfiche WebLink

Home Browse Search

F ' Report-Vapor Extraction 1 Air Sparge Remedial System Page 10 Former Bank of Stockton/Western Lift:Site Project No, 102.3 March 25, 2005 ' 6.0 SYSTEM START-UP On January 27, 2005, the system was started and operated for approximately one and one- half hours in the presence of Mr. Craig Mitchell of the San Joaquin County APCD and Mr. Harlin Knoll of the San Joaquin County EHD. The two inspectors witnessed the sytem operating and initial monitoring and sampling activities. At the time of the start-up ' test, tall four air sparge wells were on-line and the vapor extraction system was connected to well VES-1. The following table summarizes the systems operating characteristics: Time Suction Total VE input Exhaust Rate Sparge Vac. PID PID Rate Press. Reading Readin 0920 79 cfm 10.1 cfm 60" 122 ppm 0 ppm 1025 79 cfm 10.1 cfm 60". 1,450 ppm 0 ppm ' 1040 79 cfm 10.1 cfm 60" X3,000 ppm 0 ppm, 1050 79 cfm 10.1 cfm 60" 239 ppm 0 ppm. During the time the system was operating, air samples were collected for laboratory analysis. Input gas was collected at 0920 and 1040. A sample from the exhust stack was collected at 1040. All three samples were collected from sample ports designed for the purpose. A hand-operated pump was used to transfer gas air from the sample ports ' directly into 1-liter Tedlar sample bags. Upon collection each sample bag was sealed by closing the sample valve, labled and transported to Argon Labs of Ceres, CA (DHS 9 ' 2585) under chain-of-custody protocol. The samples were tested for Total Petroleum Hydrocarbons (TPH-G) using EPA method ' 5030 and for Benzene, Toluene, Ethylbenzene and Xylene (BTEX) using EPA method 8021b. The following table summarizes the laboratory analytical results: I ' Sam le Time I Sample ID 1 TPH-G I Benzene Toluene Ethyl-Benzene r Xylene In ut 0920 VEWI-1020 4.2 ND<0.3 ND<0.3 ND<0.3 ND<0.6 Input 1040 VEWI-1040 4.3 3.9 2.2 1.3 1.9 ' Exhaust P, 1040 Exhaust 0.18 ND<0.3 0.3 0.4 0.6 Detect Limit 1 1 0.05 mg/L 1 0.3 0.3 0.3 0.6 ' Based on these data, the following calculations can be made: Time Suction TPH VE Exhaust ' Rate Conc. Rate Rate 0920 79 cfm 4.2 ppm 30 lb/day NA 1040 79 cfm 4.3 ppm 1 31 lb/44yj 1.3 lb/da ' 2937 Veneman Ave., 413240 Geo-Phase Environmental Inc. Phone(209) 569-0293 Modesto, CA 95356 Fax(209)569-0295 1