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Working To Restore Nature <br /> M_, <br /> ; <br /> �r_:11a <br /> 1710 Main Street <br /> Escalon, CA 95320 MAY 14 1999 <br /> Phone (209) 838-3507 ENVIRONMENTAL WEALTH <br /> FAX (209) 838-3509 PERMIT/SERVICES <br /> May 13, 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 1993 First Quarter Groundwater Monitoring Activit es/Remediation System <br /> Performance Report, Tri-Valley Growers, 26200 I�11 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 first quarter of 1993 Activities during the quarter included <br /> monitoring of groundwater, sampling for dissolved hydrocarbons from five of the monitoring <br /> wells on site, operation of the remediation system, and analysis of samples from the treatment <br /> system influent (well MW4) and carbon filter effluents Remediation system operation began <br /> on May 13, 1991 <br /> Groundwater Monitoring <br /> Groundwater monitoring was conducted in January, February and March 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 through 5) -_(as-_Tr=t i7 <br /> -w is e 141x 4-)was-sisen_�n average_of 55,73 TTeet""`� ni`-e—Dece—Deer;1_932 The <br /> groundwater monitoring data are summarized in Table 1 Groundwater monitoring logs are <br /> included in Attachment I <br /> Groundwater samples were collected from monitoring wells MW 1 through MW3, MWS, and <br /> MW6 on March 25, 1993 after stabilization of pH, electrical conductivity (EC) and temperature <br /> The monitoring wells were purged using an above-ground centrifugal pump with dedicated <br /> tubing Well purge logs are included in Attachment 1 Samples were analyzed for benzene, <br /> QR_11;RLYI1QMR1993 FNL <br />