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E11�'yt� Mr James Barton ' July 30, 2004 Page S Efforts to Cease Plume Movement In response to RWQCB letter dated June 18, 2004, ENSR completed the following activities in ' an effort to cease plume movement 1 A "major maintenance" service, by the manufacturer's approved vendor, was performed on the air compressor for the air sparging air system on June 14, 2004 2 ENSR submitted a letter to the San Joaquin Valley Air Pollution Control District (SJVAPCD) on July 13, 2004 requesting that the soil vapor extraction (SVE) system permit be reinstated 3 ENSR remediation systems engineers visited the site on June 15, 2004 to observe the performance of the air sparge (AS) system and examine the SVE ENSR personnel started the motors on the SVE system and observed that a major service, by a manufacturer's approved vendor, would be necessary in order for the system to perform at optimum ' conditions Note ENSR did not induce a vacuum on any of the SVE wells connected to the SVE system 4 A file review was conducted at the RWQCB on July 14, 2004 ' 5 ENSR reduced the air flow to the AS wells located north side of Robinhood Drive and increased the air flow wells on the south side of Robinhood Drive as outlined in ENSR's work plan dated June 14, 2004 6 ENSR modified the AS wells with ports for measuring pressure and flow rate on July 21 and July 22, 2004 and collected subsequent readings Well pressure and flow rates are included in Table 3 ' Results of ENSRs Efforts to Cease Plume Movement 1 AS system has operated continuously since June 14, 2004 The AS system is operated in ' pulse operation mode 2 Since ENSR submitted a letter to the SJVAPCD requesting that the SVE system be permitted to operate, ENSR corresponded with the SJVAPCD in a telephone conversation ' on July 20, 2004 The SJVAPCD informed ENSR that since the permit has expired, an application to run the system along with a corresponding fee must be submitted in order to have the SVE system properly permitted ENSR re-submitted the necessary paperwork and fees to the SJVAPCD on July 27, 2004 ENSR spoke with Mr James Harader of the SJVAPCD Mr Harader informed ENSR that the SJVAPCD received ENSR's application and fee, and would issue ENSR a permit to operate within 30-days pending the results of a e Health Risk Assessment 3 Since ENSR personnel visited the site on June 15, 2004 in order to inspect the SVE system, ENSR has been in correspondence with the manufacturer of the SVE system—Baker ' Furnace, Inc , and will have a major service will be performed on the SVE system prior to initiating full operation of the system 4 Elevated concentrations of dissolved oxygen were observed during the third quarter 2004 monitoring and sampling event a5 Additional ports will allow ENSR to optimize the system more effectively without adding a • shut-off valve to the AS line going under Robinhood Drive ' J IProiects10594015098 293TinaAReports15096 Well Results Report doc ' CvWr 30 Vuars of�xrP1JPi7ce w Enynonmenta!Service-