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Site Background Information Chapin Brothers Investements, Inc • Page 5of12 bentonite)was used to make a 4-foot plug above the filtcrpack and the wells were grouted to surface grade with portland cement An eight-inch traffic box was installed at the surface for each IAS point On 24 April 1997, monitoring well MW-6 was installed across Mt Diablo Ave from the site SOIL VAPOR EXTRACTION SYSTEM INSTALLATION On 04 March 1997,a King,Buck/Hasstech(KBH)(90-032)catalytic oxidation unit(SVE unit)was delivered to the site The extraction equipment was placed inside a fenced enclosure near the west end of the site Replacement parts for all missing or broken items were purchased and installed On 01 April 1997, the natural gas service to the SVE unit on the site was upgraded to 5 pound of pressure per square inch, the minimum pressure required to operate the KBH catalytic oxidation system The existing network at the site consisted of subsurface flex piping from wells VE-2, VE-5, VE-6 ' and MW-4 to the remediation unit enclosure AGE installed additional subsurface piping from wells VE-1, VW-1 and VW-7 The piping was then routed through a moisture knockout drum to a 5- horsepower, 200 cubic feet/minute (cfm) regenerative blower and into the KBH catalytic oxidizer ' oven AGE installed an 1n-line flow meter after the blower motor as well as sampling ports before the knockout drum, between the oven and after the oven to monitor the concentration of extracted hydrocarbons and efficiency of hydrocarbon destruction ' SOIL VAPOR EXTRACTION START-UP AND UTILITY UPGRADES The KBH catalytic oxidation SVE system began full-scale operation on 01 April 1997 The SVE unit operated at a maximum flow rate for approximately for three hours At approximately 1800 hours on 01 April 1997,the 60 amp power service at the PG&E service connection to the site failed The power demand of the SVE unit was greater than the service connection could supply A new 100 ' amp power service was installed at the site Subsequently anew power transformer was installed for the site on 04 June 1997, to prevent the loss of power voltage during peak usage I � AIR-SPARGING SYSTEM INSTALLATION The existing subsurface network consisted on galvanized steel piping from AS-1 to the remediation enclosure Additional IAS infection points,necessary for efficient ground water remediation, were installed on 19 April 1997 A compressor-based EnviroSparge IAS system was installed at the site on 24 March 1997 The IAS system delivers 7 to 10 standard cubic feet per minute (scfm) at a pressure of 12 to 15 pounds per square inch, adequate to volatilize the petroleum hydrocarbons in Advanced GeoEnvironmental,Inc 1