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a <br /> ,� 4 .� - <br /> a :_ <br /> ; . ,. <br /> '1 <br /> maim M- 0, <br /> 1 <br /> VYAVI-JUMORK CORP. _- _ _— <br /> J = A RLSNA Cam an mar " t 'sem <br /> y F Y nvironmentalSolullons <br /> `r d Through Applied Srlenre. <br /> �e .� I r te. CT 2 1"1 .:ng)neering&Conslroclion <br /> '"' C' ra 3 Ya 1710 Main Street ENVIRONME=NTAL HEALTH <br /> M Q Ld� b Pscalon, CA 95320 PERMIT/SERVICES <br /> Phone: (209)838 <br /> 1 3507 <br /> U ,lam 'm ax: [209) 838-3509 <br /> �w d October 15, 1991 <br /> m <br /> LUp +1 ai E �i E tV w <br /> a 5 ►= tel ►_ � m <br /> it ~ t Ms. Mary Meays <br /> } \ n San Joaquin County Public Health Services <br /> .� Environmental Health Division <br /> CYa o - o P.O. Box 2009 <br /> � �� a r` Stockton, CA 95201 <br /> co <br /> ��, Q <br /> ��i a <br /> Go <br /> _ RE: 1991 Third Quarter Groundwater Monitoring Activities/Remediation System <br /> Z i E $ Performance Report, Tri-Valley Growers, 26200 Nowell Road, Thornton, <br /> CY <br /> California. <br /> rQC a 7N D UvCV <br /> Cr <br /> 3d1131dY4VS 3 m <br /> Dear Mary:¢OSl3NIV1N00#ll <br /> This letter RESNA IndustrieslWaterWork's (RFSNA's) activities at Tri-Valley <br /> report p <br /> >- Growers' Thornton plant (Figure 1) during the third quarter of 1991. Activities during the <br /> pLU quarter included monitoring of groundwater, sampling for dissolved hydrocarbons from the five <br /> C13 ° a monitoring wells on site, operation and maintenance of the remediation system, analysis of <br /> to <br /> U o t � I samples from the treatment system influent (well MW4) and carbon filter effluent (Figure 2). <br /> LL 1t-L $ .2 z ' Remediation system operation began on May 13, 1991. <br /> Z I •� o } I <br /> U Groundwater monitoring was conducted in July,August,and September. Groundwater gradient <br /> E ,ti maps reflect a depression. created by pumping of the groundwater in monitoring well MW4 <br /> �_ --- (Figures 2 through 4). The cone of depression around the pumping well and the area of <br /> srlio ,� influence are demonstrated in these maps. The groundwater monitoring data is summarized in <br /> dwoa <br /> � Table 1. <br /> LU <br /> a o p <br /> a �� $ <br /> m o ; o Groundwater samples were collected from five monitoring wells on September 12, 19' 1 after <br /> U1- stabilization of pH, electrical conductivity (EC) and temperature. The monitoring wells weretj <br /> purged using dedicated submersible pumps. Well purge leas are included in Attachment 1. <br /> o z <br /> �n ' Jf p <br /> r� I! <br />