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Mr Kyle Christie <br /> May 15, 1995 <br /> Page 3 <br />• Status of Site Remediation <br /> This section provides a description of the remediation system and discusses the operation of <br /> the remediation system for the first quarter 1995 <br /> Description The remediation system at ARCO Facility 2133 consists of a groundwater <br /> extraction system (GWES) and a soil vapor extraction/air sparging (SVE/AS) system. The <br /> GWES consists of one groundwater extraction well (R) titted with a submersible pump, with <br /> a designed pumping capacity of 15 gallons per minute The extracted groundwater is <br /> discharged directly to the City of Stockton sanitary sewer under City of Stockton Wastewater <br /> Discharge Permit The permit expires December 31, 1997 The extracted groundwater does <br /> not require treatment prior to discharge (as per the requirements of the wastewater discharge <br /> permit) The system is sampled monthly to ensure that discharge is within permitted limits <br /> The GWES has operated nearly continuously since June 1991 Prior to this time, a free <br /> product recovery system operated at the site from 1984 to 1986 After the free product was <br /> recovered, the system was modified for use as a GWES and operated periodically from 1986 <br /> to 1991 Additional modifications were made to improve the system in 1991 <br /> The SVEJAS system consists of 14 soil vapor extraction wells (V-1 through V-12, MW-2 and <br /> E-6) and nine air sparging wells (S-1 through S-9) The vapor wells are connected to an <br /> Airex Katox 100 catalytic oxidizer unit. Construction of the SVE/AS system was completed <br />• during the last quarter of 1994 and the system was brought on line in January of 1995 The <br /> system is running under Authority to Construct permit number N-78-3-0 issued by the San <br /> Joaquin Valley Unified Air Pollution Control District on August 1, 1994 Vapor extracted <br /> from the site is treated by the catalytic oxidizer unit which must either meet a minimum VOC <br /> destruction efficiency of 95 percent, or the total VOC emission rate shall not exceed 2 pounds <br /> in any one day Monthly grab samples are taken at the system influent and effluent to ensure <br /> that the conditions of the Authority to Construct are met. <br /> Operating Conditions This Quarter During the first quarter of 1995, the GWES operated <br /> approximately 81 percent of the time The system was down for 17 days due to a dead <br /> battery pack which ran the data recorder. A new battery was ordered and installed and the <br /> GWES resumed operation on March 17, 1995 During operation of the GWES in the first <br /> quarter of 1995, approximately 1 1 million gallons were extracted and discharged. This <br /> quarter approximately 2 0 pounds of TPH-G and 0 1 pounds of benzene were removed from <br /> the groundwater The total amount of benzene and TPH-G in the extracted groundwater is <br /> shown in Table 4 The GWES analytical results are included in Exhibit B The quantity of <br /> BTEX and TPH-G discharged to the sewer is well within the limits stated in the permit <br /> During the first quarter of 1995, the SVE/AS operated approximately 51 percent of the time. <br /> The system was down for 35 days due to a problem with the unit's catalyst On <br /> February 22, 1995, representatives from Airex, the catalytic oxidizer manufacturer, removed <br /> the catalyst after unsuccessfully trying to adjust the system to meet the required destruction <br />• Use or disclosure of data contained on this sheet is subYeet to the restriction specified at the beginning of this <br /> document <br /> 2060\REPORTS\I ST95QTR ZP'r <br />