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s <br /> w+ <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 F.+r<. "S:'{wyz S' <br /> San Joaquin County Public Health Services APR 1 6 1992 <br /> Environmental Health Division FNVII`QhlP.IE,�Tr;L i•iEAL T Li <br /> w. P.O. Box 2009 PERIVII1Y VICL� <br /> Stockton, CA 95201 <br /> RE: 1992 First Quarter Groundwater Monitoring Activities/Remediation System <br /> Performance Report, Tri-Valley Growers, 25200 Nowell Road, Thornton, <br /> California. <br /> Dear Maiy: <br /> This letter report updates RESNA Industries' (RESNA's) activities at Tri-Valley Growers' <br /> 1 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 hi March. <br /> Grounewater 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 /> 1:.., and the area of influence are demonstrated in these maps. The water table has risen <br /> approximaiely three feet in March due to the rain recharging tha 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, MIW5 and <br /> MW6 on March I2, 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-I. Samples were analyzed-for benzenes toluene*ethylbenzenei-xylenes- <br /> to <br /> QN1032792.SAY <br /> Ga <br />