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i <br /> � ZMA <br /> RE"CEIVED Working To Restore Nature <br /> 1710 Main Street <br /> Escalon, CA 95320 JAN 2 7 1993 <br /> Phone (209) 838-3507 <br /> FAX (209) 838-3509 ENVI 9NMENTAL HALTH <br /> PERMIT/SERVICES <br /> January 25, 1993 <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 1992 Fourth Quarter Groundwater Monitoring Activities/Remediation System <br /> Performance Report, Tri-Valley Growers, 26200 Newell Road, Thornton, CA <br /> Dear Ms Meays <br /> This letter report updates RESNA Industries' (RESNA's) activities at Tri-Valley Growers' <br /> Thornton plant (Figure 1) during the fourth quarter of 1992 Activities during the quarter <br /> included monitoring of groundwater, sampling for dissolved hydrocarbons from two of the <br /> monitoring wells on site, operation of the remediation system, and analysts of samples from the <br /> treatment system influent(well MW4) and carbon filter effluents Remediation system operation <br /> began on May 13, 1991 <br /> Groundwater monitoring was conducted in October, November, and December Groundwater <br /> gradient maps illustrate a cone of depression and an area of influence created by pumping of the <br /> groundwater in monitoring well MW4 (Figures 2 through 4) The water table (as measured in <br /> all wells except MW-4) has risen an average of 3 88 since September, 1992 The groundwater <br /> monitoring data are summarized in Table 1 Groundwater monitoring logs are included in <br /> Attachment I <br /> Groundwater samples were collected from monitoring wells MW1 and MW6 on December 16, <br /> 1992 after stabilization of pH, electrical conductivity (EC) and temperature The monitoring <br /> wells were purged using an above-ground centrifugal pump with dedicated tubing Well purge <br /> logs are included in Attachment 1 Samples were analyzed for benzene, toluene, ethylbenzene, <br /> QRTERLYI4QMR1992 FNL <br />