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EMIR. ; <br /> Consulting•Engineering• Remediation 10324 Placer Lane <br /> Suite 200 <br /> Sacramento,CA 95827 <br /> (916)362-7100 <br /> July 26, 1999 FAX(916)362-8100 <br /> ENSR Project No. 8728-001 http://www.ensr.com <br /> Anthony Mendes <br /> San Joaquin Valley Unified Air Pollution Control District <br /> 4230 Kiernan Avenue, Suite 130 <br /> Modesto, CA 95356-9321 <br /> Subject: Emission Verification Results <br /> San Joaquin Catholic Cemetery <br /> Harding Way and Cemetery Lane, Stockton, CA <br /> Dear Mr. Mendes: <br /> On behalf of the San Joaquin Catholic Cemetery, ENSR Engineering and Consulting (ENSR) is <br /> submitting this letter documenting emission quantification for vapor extraction system start-up at <br /> the subject site (Figures 1 and 2). Laboratory samples were taken during the initial start-up of <br /> the soil vapor extraction system as required by Authority to Construct (ATC) No. N-732-3-0. The <br /> test was performed on June 2, 1999 under the supervision of Diane Busalacchi, an inspector <br /> with the San Joaquin Valley Unified Air Pollution Control District (SJVUAPCD). Samples were <br /> taken in order to measure the VOC emission rate and control efficiency of the ThermTech, Inc. <br /> Model VAC25 Thermal/Catalytic Oxidizer. <br /> The remediation system is connected to six (6) vapor extraction wells (VW-1 S, VW-1 D, VW-2S, <br /> VW-2D, VW-3, and VW-4) and one (1) groundwater monitoring well (MW-1) (Figure 2). The <br /> emission verification test was performed while extracting from wells VW-1D, VW-1S, VW-2S, <br /> VW-3, and VW-4. The following test procedures were conducted according to the ENSR <br /> standard operating procedures (SOPs) included as Attachment 1. <br /> • The test was initiated at approximately 3:30 PM on June 2, 1999. Once started, the <br /> system was given ample time to stabilize, after which, the system parameters were <br /> measured. Influent and effluent air velocity pressures were measured using a Pitot tube, <br /> static system pressures were measured with a differential pressure gauge, and intake, <br /> exhaust, and combustion temperatures were measured with an electronic gauge. <br /> • The air samples were analyzed for five constituents of concern: purgeable <br /> hydrocarbons, benzene, toluene, ethylbenzene, and xylenes. <br /> The system parameters are shown in Table 1. The laboratory analytical report is included as <br /> Attachment 2 and the corresponding results are summarized in Table 2. System influent <br /> concentrations and extraction rates are also presented in Table 2. <br /> :[E N SR1872810011i3728001.BLT.doc <br />