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-iffACAffMA% <br /> �'���� �'F ��� �� Working To Restore Nature <br /> 1710 Main Street 93 OCT -8 P11 2: 20 <br /> Escalon, CA 95320 <br /> Phone (209) 838-3507 October 7, 1993 <br /> FAX (209) 838-3509 <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 Third Quarter 1993 Groundwater Monitoring Activities/Remediation System Performance <br /> Report, Tn-Valley Growers, 26200 Nowell Road, Thornton, California <br /> Dear Ms Meays. <br /> This letter report updates RESNA Industries, Inc (RESNA) activities at Tn-Valley Growers' <br /> Thornton plant (Figure 1) during the third quarter of 1993 Activities dunng the quarter <br /> included monitoring of groundwater, sampling for dissolved hydrocarbons from the monitoring <br /> wells on site, treating all purge water from the monitoring wells through the remediation system, <br /> operation of the remediation system, and analysis of samples from the treatment system influent <br /> (well MW4) and carbon filter effluents Remediation system operation began on May 13, 1991 <br /> GROUNDWATER MONITORING & SAMPLING <br /> Groundwater monitoring was conducted in July, August, and September Groundwater gradient <br /> maps illustrate a cone of depression and an area of influence created by pumping of the <br /> groundwater in monitoring well MW4 (Figures 2, 3 and 4) The water table (as measured to <br /> all wells except MW4) has dropped an average of 2 70 feet since June 1993 The groundwater <br /> monitoring data are summarized in Table 1. Groundwater monitoring logs are included in <br /> Attachment A <br /> Groundwater samples were collected from monitoring wells MW 1 through MW3, MW5, MW6, <br /> and neighboring domestic well LRW on September 9, 1993 after stabilization of pH, electrical <br /> conductivity (EC) and temperature The monitoring wells were purged using an above-ground <br /> centrifugal pump with dedicated tubing Well purge logs are included in Attachment A <br /> r� <br /> 3QR-1993 FNL <br /> q� <br />