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Working To Restore Nature <br /> Influent and effluent samples from the pumping well (MW4) were collected for analysts of BTEX <br /> and TPHg on December 27, 1993 Analytical results indicate a slight increase in TPHg and BTEX <br /> concentrations in the influent sample (INF) collected during this sampling round The samples <br /> collected from carbon filter 1 (EFF1C) and carbon filter 2 (EFF2C) did not contain any detectable <br /> analytes Influent BTEX and TPHg concentrations over time are plotted on Figures 5 and 6 <br /> Laboratory analyses were performed by Sequoia Analytical Laboratory (ELAP No 1210) The <br /> analytical results are summarized in Table 2, the laboratory reports and chain of custody <br /> documentation are presented in Attachment B <br /> REMEDIATION SYSTEM PERFORMANCE <br /> Overall, analytical results support the effectiveness of the system Historical sampling results show <br /> fluctuating influent hydrocarbon concentrations which may be attributed to fluctuating water table <br /> elevations However, for the most part, laboratory results indicate that influent TPHg and BTEX <br /> concentrations have been significantly reduced since system start-up <br /> RESNA personnel will continue with the quarterly monitoring program which will include reports <br /> detailing system performance We will continue to monitor system performance and adjust pumping <br /> rates as necessary If you have any questions regarding this project please contact Bill Channell at <br /> our Escalon office (209) 838-3507 <br /> Respectfully, <br /> RESNA Industries, Inc <br /> -f�l aAAe S -M q <br /> Marcie R McCabe <br /> Project Geologist <br /> Bill Channell <br /> Branch Manager <br /> Gregory P Stahl <br /> CA Registered Geologist No 5023 <br /> MRM/ggk <br /> attachments <br /> 01 pc Beth Thayer, CRWQCB <br /> Juan Quijano, Tri-Valley Growers <br /> 1521421QRTLYI4QR 1993 FNL <br /> i <br />