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pito Restore Nature1710 Main Street ' �� JAN 2 1 1992 <br /> Escalon, CA 95320 - <br /> ,/AN ENVIRONMENTAL HFAI Thi <br /> EN <br /> Phone (209)838-3507 1992 PERMIT/SERVICE <br /> FAX (209)838-3509 VlRUi��;y;t� 1A MEALTH anuary 15, 1992 <br /> PERMIT/SERVICES <br /> Ms Mary Meays <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P O Box 2009 <br /> Stockton, CA 95201 <br /> RE: 1991 Fourth Quarter Groundwater Monitoring Activities/Remediation System <br /> Performance Report, Tn-Valley Growers, 26200 Nowell Road, Thornton, <br /> California. <br /> Dear Mary- <br /> This letter report updates RESNA Industries' (RESNA's) activities at Tri-Valley Growers' <br /> Thornton plant (Figure 1) during the fourth quarter of 1991 Activities during the quarter <br /> included monitoring of groundwater, sampling for dissolved hydrocarbons from three monitoring <br /> wells on site, replacing carbon filter 1, operation and maintenance of the remediation system, <br /> analysis of samples from the treatment system influent (well MW4) and carbon filter effluent <br /> Remediation system operation began on May 13, 1991 <br /> Groundwater monitoring was conducted in October, November, and December Groundwater <br /> gradient maps reflect a depression created by pumping of the groundwater in monitoring well <br /> MW4 (Figures 2 through 4) The cone of depression around the pumping well and the area of <br /> influence are demonstrated in these maps The groundwater monitoring data is summarized in <br /> Table 1. <br /> Groundwater samples were collected from monitoring wells 1, 3, and 6 on December 19, 1991 <br /> after stabilization of pH, electrical conductivity (EC) and temperature. The monitoring wells <br /> were purged using dedicated submersible pumps Well purge logs are included in Attachment <br /> 1 Samples were analyzed for benzene, toluene, ethylbenzene, xylenes (BTEX), and total <br /> QM010692 SAX <br />