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ffikMat. eF I ornia �or�Fxior' S a 1_6 VW..x U tae .A�t r " 's 7-7 � � 1w edaa co i eetd a een 1 "00 Al1%I and 13.3U PM are constd"eyed r p eseatte ade ��, .�.{. and q ate for disctissron ana conclusions. The VET was conducted for four hours, with blower influent and carbon effluent vapor samples collected for laboratory analyses, Collected samples were submitted under chain- of custody (COC) to Kiff ArialyttGal (Itf uy , a State-certified laboratory in Davis, California (Cern=fcate Flo. 2236): the requesed analyses were total petroleum hydrocarbons as gasoline (TPI . ( ) y g), anted the gaso�ltr�e constrtuents benzene, toluene, ethy,,lbenzene, and xylenes BTFX, b modff ed Vil nmental`Profectron Agency (EPA) Methods 8015/8020, AIR SPARGE TEST PROCEDURES The A$T was Perfotmed on December 14, 1:999 and consisted of the injection of air into well AS-1 (screened`70'to 75 feet bsg) using a one-horsepower Gast oilless corepressor. The injection flowrate and pressure response for wells VW-1, MW-2 and MW-3 were monitored during the 8-hour test. VAPOR EXTRACTION TEST RESULTS A summary of the VET field data and analytical results are summarized in Table I. The laboratory reports for the air samples are attached. TPHg vapor concentrations during the • test ranged from 5,800 (VW-1) to 13,000 VW-2 g was detected in the effluent sample collected from the parts porPtreamer lafteion rptthe carbon Hun t. The daily TPHg mass extraction rate ranged from 46 (V W-i) to 136 (V W-2 e (PPd)• The maximum representative flowrate achieved was 27 scfm from VW-2rataa wellhead vacuum of 60 inches of H2O. The higher flowrates recorded during the beginning of the test are not considered representative due to the camlock fitting leak. While extracting from VW-2, vacuum r fluences ran m from 0.05 to 0.34 inches H2O were observed in well VW-5, which is loca ed'.a roximate 29 feet from and screened in the PP same interval (37 — 47 feet bgs) asV W�,2. Vacuum iri#luence ranging from 0.05 to 0.16 inches H2O were observed in well V 4;:which is also located approximately 29 feet from extraction well VW-2 and screened from 50 — 65 feet bgs. No vacuum response was observed in well VW-7, located approgimately 35 feet from VW-2. While extracting from VW-1, vacuum influences ranging from 0.08 to 0.15 were observed in wells VW-4 and VW- 5. No vacuum response was observed in well VW-7 while extracting from well VW_I. Based on the field and laboratory results obtained, it appears that vapor extraction is a feasible remediation alternative for impacted soil beneath the site. Field and laboratory data indicate that higher TPHg mass extraction rates are achievable from extra ction which is screened from 37 to 47 feet bgs. Horizon estimates a radius of influence cin excess of 30 feet while extracting from both wells VW-1 and VW-2. It is expected that the flowrate and vacuum influence characteristics for wells VW-4 and VW-5 will be similar to wells VW-1 and VW-2. Estimated radius of influences for the nested well groups VW-1NW-2 and VW-4NW-5 are depicted on Figure 2. The locations of these wells appear to be A:14741221VET AST Rpt.doc Job No. 1474.22 2 HORIZON ENVIRONMENTA�I, INC.