ARCHIVED REPORTS XR0009541 - Laserfiche WebLink

Home Browse Search

Addendum to Corrective Action Plan Page 9 • Former Manna Pro Site ' Project No 1011 • August 12,2002 ' 4.2.1 Soil Vapor Extraction System Start Up On the first day of system operation, two vapor extraction wells will be placed in service, and an air sample will be collected from both the influent and effluent sides of the treatment system to satisfy an Air Pollution Control District permit condition Initially, the combined vapor extraction rate will be held to less that 150 scfm Over a period of several weeks, the rate will be increased to about 400 scfm, and one to two additional extraction wells will be placed online A manifold connecting the wells to the surface ' equipment will be equipped with ball valves so that the extraction rates for each well can be controlled and balanced with the other wells 1 4.2.2 Air Sparge System Start Up The air sparge compressors will be started on the first day of system operation The rate ' of air injection will be monitored and adjusted so the each sparge well is injection approximately the same air volume Initially the sparge rate will be geld to less than 3 scfm, per well, and then gradually increased to at lease 5 scfm 4.3 Remedial System Monitoring lie The system will be monitored during the course of the initial operation This will include making depth to groundwater measurements, airflow and pressure measurements, and vapor readings with a portable ionization detector(PID) as described below Periodically, field measurements of oxygen in the groundwater will also be taken The system will be monitored on a daily basis for the first three days of operation After the initial three days of operation, the system will be monitored twice a week (or if field and equipment conditions seem stable, less frequently) In no event will the system be checked and serviced on less than weekly intervals ' 4.3.1 Process/Effluent Air Monitoring ' Airflow measurements will be made during any flow adjustment to the vapor extraction system A digital manometer will be inserted in to the vapor extraction sample port to measure the rate of vapor extraction This method will be used to measure both the total ' extraction rate and the rate from each well, so that the system can be balanced Air samples will be collected at the start up of the system and at various times during the operation of the system At least once each week, PID readings will be taken from vapor samples collected at the sample port downstream of each carbon filter as well as upstream of the vapor extraction dilute air valve Air samples for laboratory analysis will be collected from these same points on a monthly basis (The air sample collection and fanalysis procedure is addressed in Section 5 3 2937 Veneman Ave , #B240 Geo-Phase Environmental Inc Phone(209) 569-0293 Modesto, CA 95356 Fax(209) 569-0295