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i 2 Chevron Products Company Chevron Service Station#9-4275,2905 Sen acorn Holt Drive Stoddor4 CA November 3 1998 • Air Sparging System The AS system is compnsed of rune AS wells (GM-1 through GM-9) and a 1 5 hp rotary vane compressor The AS system alternately infects air into wells GM-1 through GM-5 and wells GM-6 through GM-9 During the reporting penod, the AS system was approximately 58 percent operational Downtime was associated with a burned out motor on the air sparge compressor The motor was replaced and the system restarted on August 14, 1998 The AS system operated at an average flow rate of 7 7 cfm at an average infection pressure of 6 5 pounds per square inch Air sparge operational data including flow rate and applied pressure data are presented in Table 1 Dissolved oxygen concentrations were measured in site morutonng wells on September 10, 1998 and averaged 1 3 mg/L, a slight increase from the previous quarters data Current and historical dissolved oxygen concentrations are summarized in Table 2 Conclusions The SVE system will remain shutdown until water levels have dropped and exposed a sufficient length of screen In the SVE wells The AS system will continue to be operated to infect air into the groundwater and provide oxygen for biodegradation If you have any questions or require additional information, please do not hesitate to call me at (916) 364-1880 Sincerely, SECOR International Incorporated Rusty E` enkosky, P Project Engineer Attachments Table 1 - Air Sparge System Operational Data Table 2 - Dissolved Oxygen Well Concentrations (mg/L) Figure 1 - Site Location Map Figure 2 - Site Plan Attachment A— Remedial System Field Data Sheets cc Ms Laurie Duncan, San Joaquin Environmental Health Department Mr Paul Supple, ARCO Products Company Mr Mark List, Regional Water Quality Control Board 76407-032-01194275 O&M 3Q98 Report doc