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First Quarter Groundwater Monitoring Report U �� is C M Weber Enterprises, Stockton, California April 2, 1992 All purged water was containerized In DOT approved drums and left on site pending laboratory analyses Water containing nondetectable concentrations of BTEX and TPHG will be disposed of at the site by dumping the water within the planters Laboratory analyses determined that petroleum hydrocarbons, above method detection limits, were detected in monitoring wells MW-1, MW-2 and MW-3. All constituents, except benzene and total xylenes are below the Maximum Contaminant Levels (MCL's) Laboratory reports with chain-of-custody documents are presented in Attachment 2 Table 2 summarizes laboratory results since April 1991 On January 21, 1992, an Authority to Construct permit (No AP91-467) was granted for an internal combustion engine to be used for in-situ soil remediation system at the site The system became operational on January 24, 1992 During its operational period, the system removed 70 pounds of contaminants from the soil The system was shut-down, however, on March 13, 1992, due to performance restrictions inherent to the extraction vapor However, to maximize remediation efforts, a Thermal Oxidizer became operational on March 31, 1992 after approval of an Authority to Construct permit Construction of the groundwater remediation system is complete and ready for start-up pending approval of the Waste Discharge permit from the California Regional Water Quality Control Board If you have any questions regarding this project, please contact me or the Project Manager, Tina Le Page, at our Escalon office (209) 838-3507 Respectfully, RESNA Industries Michael Delgado Probe t Engineer /� Gregory P Stahl CA Registered Geologist No 5023 MAD/ggk Attachments PC Beth Thayer - CA RWQCB Jeannie Zolezzi - Neumiller & Beardslee John Weber - C M. Weber Enterprises, Inc QR032692 MAD