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GROUND ZERO ANALYSIS, INc. <br /> 1714 Main Street <br /> EWWWn, California 95320 <br /> Telephone: (209) 838-9858 <br /> Fac3inile: (209) 838-9$83 <br /> January 7, 1998 <br /> Mr Bruce 'biter <br /> San Joaquin Valley Unified Air Pollution Control District <br /> 4230 Kiernan Avenue, Suite 130 <br /> E <br /> Modesto, CA 95356 <br /> E I <br /> Subject Initial Startup Compliance--Soil Vapor Extraction System <br /> G <br /> Authority to Construct #N-3851-1-0 <br /> 102 South Wilson Way, Stockton, California <br /> Dear Mr Tuter <br /> i <br /> Ground Zero Analysis, Inc (Ground Zero) is submitting this letter to document the startup of <br /> the thermox unit at the subject site On November 4, 1997, the vapor extraction system (VES) <br /> ` was started, monitored, sampled, and observed by yourself and Mr Ron Rowe of San Joaquin <br /> County Public Health Services/Environmental Health Division (PHS/EHD). <br /> The thermox unit has an inline flow meter to measure the influent flow. During the startu test <br /> k the influent flow was 257 cubic feet per minute (cfm) and was recorded on the systems <br /> monitoring data sheet included in Attachment A The effluent flow is not measured directly and <br /> must be calculated by summing the influent flow, the natural gas flow, and the supplemental air <br /> flow According to the manufacturer's specifications, the maximum natural gas flow to the <br /> thermox is 850,000 BTU per hour, which is equivalent to approximately 850 cubic feet per hour <br /> or 14 cfm According to the specifications for the VES, the maximum supplemental air flow <br /> to the thermox burner is 70 cfm Therefore, the approximate maximum effluent flow during the <br /> startup test was 341 cfm <br /> F <br /> ` Ground Zero personnel measured the influent and effluent vapor concentrations using a rented <br /> photoionizatton detector(PID)and recorded them on the systems monitoring data sheet, included <br /> in Attachment A The influent and effluent PID readings were 500 parts per million (ppm) and <br /> 180 ppm, respectively <br /> Additionally, Ground Zero personnel collected influent and effluent vapor <br /> were submitted via couner under chain of custody protocol to SequoAnalytical les in Redwood <br /> rock Wea rpta 10198 r ept <br /> i <br />