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' Site Background Information Chapin Brothers Investements, Inc . Page 6 of 12 1 FAILED EXTRACTION SYSTEM MAINTENANCEIUPGRADES ' On 21 July 1997 the 5 horsepower electric motor which serves to power the rotary blower was removed and delivered to ACE Armature in Stockton Both motor shaft bearings were replaced and ' minor wear to the contacts were repaired The main rotor shaft was also cleaned and lubricated The motor was then replaced on the catalytic oxidation unit(SVE unit) 1 On 05 August 1997 the M-D Pneumatic 3210 rotary lob blower was removed from a King, Buck/Hasstech (KBH) catalytic oxidation unit(SVE unit) The unit was delivered to Magdeburg System (the authorized factory service representative) in South San Francisco, for repass and service The bearings, gaskets and seals were replaced The blowers exhaust valves and solenoid valves were rebuilt The pump was then tested and painted Major wear was noted to the mechanical drive shaft bearing and seal(metallic) In the opinion the staff at Magdeburg System this wear was ' indicative of excessive use and poor maintenance over a long prior of time On 27 August 1997,the blower was installed and the extraction system began operation ' On 16 September 1997 a KBH representative visited the site to correct a manufacturing defect in the SVE unit A temperature controller to the oxidation unit was noted to malfunction,falsely indicating an excessive temperature in the oxidation chamber, and thereby causing the unit to shut down as a ' precaution against destruction of the oxidation chamber A new temperature controller was added to the SVE unit,by KBH 1 SPARGING/EXTRACTION SYSTEM OPERATION AND MONITORING The IAS/SVE system was monitored daily for the first week of operation and weekly thereafter During each monitoring event, the depth to ground water and percent dissolved oxygen were ' measured for each monitoring well General system maintenance and adjustments were performed at this time The sparging flow rate was adjusted to approximately 7 to 10 scfinn and to a minimum pressure of 15 psi ' Elevated concentrations of dissolved oxygen were detected in monitoring wells MW-1,MW-2 and MW-4, as well as observation wells surrounding the ASO-1 well on the site Dissolved oxygen ' concentrations in the remaining wells,down gradient showed smaller changes The greatest changes in dissolved oxygen was again observed in monitoring wells closer to the sparging well/points The dissolved oxygen data is summarized on Table 3 Sparging rates were measured at approximately ' 7 to 10 scfin during each monitoring event A pressure of approximately 15 was to maintain for the air sparging flow rate ' The SVE unit operated at varying rates during the observation period Extraction flow rates were . calculated to range from 150 to 200 scfm Typically operation averaged at 150 scfin during the 1 Advanced GeoEnvironmental,inc.