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a <br /> RMP RMPWM�!� <br /> WATERWORK CORP. INA <br /> Y <br /> A RESNA Company <br /> Environmental Solutions <br /> Through Applied Science, <br /> Engineering&Construction <br /> 1710 Main Street ti , <br /> Escalon, CA 95320 <br /> Phone; (209) 838-3507 ( 57 y;1 11 <br /> Fax: (209) 838-3509 <br /> November 1, 1991 <br /> Ms. Mary Meays <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P.O. Box 2009 <br /> Stockton, California 95201 <br /> RE: Monthly Report; Groundwater Monitoring Activities/Remediation System <br /> Performance Report, Tri-Valley Growers, 26200 Nowell Road, Thornton, <br /> California. <br /> , <br /> Dear Mary: <br /> This letter report updates RESNA Industries (RF.SNA's) activities at Tri-Valley Growers' <br /> Thornton plant(Figure 1)during the month of October, 1991. Activities this month included <br /> monitoring of groundwater, sampling for dissolved hydrocarbons from the treatment system ; -.- <br /> influent (well MW4) and carbon filter effluent, and operation and maintenance of the <br /> remediation system. <br /> The remediation sy.cem operation, flow rate and drawdown was checked on October 10 and <br /> October 18, 1991. The system is running and continues to pump at a rate of approximately 1.13 <br /> liters per minute. <br /> Y <br /> Groundwater monitoring was conducted on October 10 and October 18, 1991. Groundwater <br /> gradient maps reflect a depression created by pumping of the groundwater in monitoring well <br /> r 1ViW4 (Figures 2 and 3). T:1e cone of depression around the pumping well and the area of <br /> influence are demonstrated in these maps. The groundwater monitoring data is summarized in <br /> Table 1. <br /> t <br /> Influeni and effluent samples were collected on October 10, 1991. Samples were analyzed for <br /> total petroleum hydrocarbons as gasoline(TPHG)and the gasoline constituents benzene,toluene, <br /> ethylbenzene;and xylenes(BTEX)by EPA methods 802018015: The sample collected from the --- <br /> influent stream was also analyzed for total oil and grease by EPA method 5520 B&F. <br /> Oil and grease was not reported at or above detection limits in the influent sample. Analytical <br /> TVGT1091.WP <br />