Laserfiche WebLink
jFKAWANAIR <br /> Working to Restore Nature <br /> ' 1710 Main Street <br /> Escalon, CA 95320 April 8, 1992 <br /> ' Phone (209) 838-3507 <br /> FAX (209)838-3509 <br /> Ms Mary Meays i <br /> ' San Joaquin County Public Health Services APR 1 0 1992 <br /> Environmental Health Division ENVIROW/IENTAL HEALTH <br /> P o. Box 2009 PERMIT/SERV1CLES <br /> Stockton, CA 95201 <br /> RE; 1992 First Quarter Groundwater Monitoring Activities/Remediation System <br /> Performance Report, Tri-Valley Growers, 26200 Nowell Road, Thornton, <br /> ' California <br /> ' Dear Mary <br /> This letter report updates RESNA Industries' (RESNA's) activities at Tn-Valley Growers' <br /> Thornton plant (Figure 1) during the first quarter of 1992 Activities during the quarter included <br /> monitoring of groundwater, sampling for dissolved hydrocarbons from five monitoring wells on <br /> ' site, operation and maintenance of the remediation system, analysis of samples from the <br /> treatment system influent (well MW4) and carbon filter effluent Remediation system operation <br /> ' began on May 13, 1991 <br /> Groundwater monitoring was conducted in January, February, and twice in March <br /> ' Groundwater gradient maps reflect a depression created by pumping of the groundwater in <br /> monitoring well MW4 (Figures 2 through 5) The cone of depression around the pumping well <br /> and the area of influence are demonstrated in these maps The water table has risen <br /> approximately three feet in March due to the rain recharging the aquifer The pumping rate has <br /> ' been increased to pump the additional volume The groundwater monitoring data is summarized <br /> in Table 1 <br /> ' Groundwater samples were collected from monitoring wells MW1, MW2, MW3, MW5 and <br /> MW6 on March 12, 1992 after stabilization of pH, electrical conductivity (EC) and temperature <br /> The monitoring wells were purged using dedicated submersible pumps Well purge logs are <br /> included in Attachment 1 Samples were analyzed for benzene, toluene, ethylbenzene, xylenes <br /> QM032792 SAY <br />