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Second Quarter Groundwater ng Repoli <br /> C M Weber Enterpnses,Stockton, <br /> California <br /> August 25, 1992 <br /> . Page 2 <br /> Laboratory analyses determined that petroleum hydrocarbons, above method detection limits, <br /> were detected in all monitoring wells except MW-5 All constituents, except benzene and total <br /> xylenes are below the Maximum Contaminant Levels (MCL's) Laboratory reports with chain- <br /> of-custody documents are presented in Attachment 2 Table 2 summarizes laboratory results <br /> since April 1991 <br /> On March 31, 1992, a 250 SCFM Thermal Oxidizer became operational The thermal oxidizer <br /> operated through July 12, 1992 and was removed from the site on July 13, 1992 The carbon <br /> adsorption system was activated on July 13, 1992 This phase of soil remediation utilizes a 5 <br /> hp blower and two 2,000 pound carbon vessels arranged in series The carbon system removes <br /> the residual hydrocarbons within the vapor stream <br /> Construction of the groundwater remediation system is complete and ready for start-up pending <br /> approval from the Stockton Municipal Utilities Department Final system modifications will be <br /> made upon discharge approval If you have any questions regarding this project, please contact <br /> me at our Escalon office (209) 838-3507 <br /> Respectfully, <br /> RESNA Industries <br /> Tina Le Page <br /> Project Manager <br /> t <br /> Gregory P Stahl <br /> CA Registered Geologist No 5023 <br /> TLP/ggk <br /> Attachments <br /> PC Beth Thayer - CA RWQCB <br /> Jeanne Zolezzi - Neumlller & Beardslee <br /> Gertrude Weber - C M Weber Enterprises, Inc <br /> QR071692FNL <br />