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i <br /> 1 <br /> i <br /> Groundwater Monitoring Activities Monthly Report November 1, 1991 <br /> Tri-Valley Growers, Thornton, CA W2102 <br /> results indicate a decrease in TPHG and the gasoline constituents benzene, toluene, and xylenes <br /> in the influent sample c3llected since, the September 12 sampling round. Ethylbenzene <br /> concentrations remained essentially the same since the September 12 sampling round. Analytical <br /> results indicate break-through in carbon filter 1 (CFTC),but not in carbon filter 2(CF2C)during <br /> this sampling round. Carbon Filter 1 will be replaced on November 11, 1991, during the next <br /> sampling round. <br /> Laboratory analyses were performed by Applied Analytical Laboratory (DHS certification <br /> #1211). The analytical results are summarized in Table 2; the laboratory reports and chain-of- <br /> custody documentation are presented in Attachment I. <br /> RESNA will continue to monitor system performance and adjust pumping rates as necessary. <br /> If you have any questions regarding this project, please contact Sharon Young or Bill Channell <br /> at our Escalon office (209) 838-3509. <br /> Respectfully, <br /> RESNA Industries <br /> vl. . <br /> — i Sharon A. Young <br /> s Microbiologist <br /> 4 <br /> Gregory P. S I <br /> CA Registered Geologist No. 5023 <br /> ATTACHMENTS Figure 1: Site Location Map <br /> Figure 2: Groundwater Gradient Map (10110191) <br /> Figure 3: Groundwater Gradient Map (10118191) <br /> Table 1: Summary of Groundwater Monitoring <br /> Table 2: Summary of Lab Analysis of Water Samples <br /> Attachment I: Laboratory Data Sheets and Chain-of- <br /> Custody Documentation <br /> Beth Thayer <br /> PC: <br /> Jean Quijano <br /> ,k <br /> 2 <br /> TVGT1091:,VP <br /> F <br />