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' 24 May 2005 • AGE-NC Project No 98-0448 ' Page 3 of 9 ' 2 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES Each ground water sample was logged on a chain-of-custody form,placed in a chilled container and ' transported to Cal Tech Environmental Laboratory (CTEL), a California Department of Health Services (DHS)-certified laboratory for analysis for ' • Total petroleum hydrocarbons quantified as gasoline (TPH-g) by EPA Method 8015M, • Benzene,toluene,ethylbenzene and xylene(BTEX)and methyl tert butyl ether(MTBE), 1,2- ' Dichloroethane(1,2-DCA),ethylene dibromide(EDB),tertiary butanol(TBA),di-isopropyl ether (DIPE), ethyl tert butyl ether (ETBE), tert amyl methyl ether (TAME) and MTBE by EPA Method 8260B 3.4. SOIL VAPOR EXTRACTION/IN-SITU AIR SPARGE PROCEDURES ' Between 22 December 2004 and 08 March 2005 an SVE remediation was P system operated at the Y �. site,utilizing a regenerative vacuum blower to selectively apply an induced vacuum to wells VW-1, VW-2 and VW-6 During this time, IAS remediation was continually operated at the site on wells AW-1 through AW-4(screened 25-30 feet),AW-5 (screened 30-35 feet)and MW-4B(screened 45- 50 feet) utilizing an air compressor to inject air beneath the water table, the injected air should volatilize dissolved hydrocarbons in ground water, and force hydrocarbon vapors into the vadose zone,where they can be withdrawn by the above SVE system Operation and design of the SVE and IAS systems for the site were described in Remedial Action Work Plan dated 07 July 2000,prepared by AGE, and approved by the EHD by letter dated 14 July 2000 3 1 SOIL VAPOR EXTRACTION SYSTEM PROCEDURES ' The SVE system utilized a Fuji, 3-horsepower regenerative vacuum blower to volatilize and extract adsorbed hydrocarbon vapor from the subsurface A manifold network of two-inch diameter, Schedule 80 PVC piping was previously installed underground from wells VW-1 through VW-6 to t a vapor moisture knockout drum and to the'inlet of the regenerative vacuum blower,the outlet from the vacuum blower was routed through two-400 pound carbon canisters A PVC ball-valve was installed at each SVE well-head for added controls and so that the SVE network could be ' reconfigured when appropriate ' A Magnehelic vacuum gauge was attached to the inlet of the blower, air flow was monitored at the inlet using a Dwyer DS-200 flow sensor A flow rate was determined from the measured differential pressure and the piping diameter using a nomograph (Appendix B) ' Advanced GeoEnvironmental,Inc