Laserfiche WebLink
24 November 1997 <br /> AGE-NC-95-0103 <br /> ' Page 2 of 6 <br /> 22 GROUND WATER SAMPLE COLLECTION <br /> Water samples were retrieved from each purged well using new disposable bailers The samples <br />' were transferred to 40-m1 EPA-approved VOA vials containing 0 5 ml of 18% hydrochloric acid as <br /> a preservative and were transported in a chilled container under chain-of-custody to McCampbell <br /> Analytical, Inc (MAI), in Pacheco, California, for laboratory analysis <br /> 1 <br /> 23 SOIL VAPOR EXTRACTION SYSTEM REPAIRS <br /> On 21 July 1997 the 5 horsepower electric motor which serves toower the rota blower was <br /> p rotary <br /> removed and delivered to ACE Armature in Stockton Both motor shaft bearings were replaced and <br /> minor wear to the contacts were repaired The main rotor shaft was also cleaned and lubricated The <br /> motor was then replaced on the catalytic oxidation unit(SVE unit) <br />' On 05 August 1997 the M-D Pneumatic 3210 rotary lob blower was removed from a Kine, <br /> Buck/Hasstech (KBH) catalytic oxidation unit (SVE unit) The unit was delivered to Magdeburg <br /> System (the authorized factory service representative) in South San Francisco, for repairs and <br /> service The blower was dismantled and boiled clean The bearings, gaskets and seals were replaced <br /> The blowers exhaust valves and solenoid valves were rebuilt The pump was then tested and painted <br /> Major wear was noted to the mechanical drive shaft bearing and seal (metallic) In the opinion the <br /> staff at Magdeburg System this wear was indicative of excessive use and poor maintenance over a <br /> long prior of time On 27 August 1997, the blower was installed and the extraction system began <br />' operation <br /> F <br /> On 16 September 1997 a KBH representative visited the site to correct a manufacturing defect in the <br /> SVE unit A temperature controller to the oxidation unit was noted to malfunction, falsely indicating <br /> an excessive temperature in the oxidation chamber, and thereby causing the unit to shut down as a ` <br /> precaution against destruction of the oxidation chamber A new temperature controller was added <br /> to the SVE unit, by KBH <br /> 24 SPARGING/EXTRACTION SYSTEM MONITORING <br />' The IAS system operated continually during the quarter and was monitored monthly The sparging <br /> flow rate was adjusted to approximately 9 to 10 scfm and to a minimum pressure of 15 psi During <br /> each monitoring event, the depth to ground water and per cent dissolved oxygen were measured for <br />' each monitoring well (Table 3) General system maintenance and adjustments were performed at <br /> these times <br />