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y .., a a � KX XIV s WA•tERWO RK Cnap. TABLE 1 n RESN4 c„mr,, __ _---- Tri Valley Growers/Thornton "ti E,VIE ala 504, Summary of Groundwater Monitanng Through Applied Science,Fngineering&construction (Page 4 of 4) 1710 Main street ESCa10n, CA 95320 • i P110ne: (209) 838-3507 u DATE WELL ID' WELLHEAD DEPTH T4 WATER TABLE Fix: {209) gag-3509 ELEVATION WATER ELEVATION I I sL 1, Mw-1 9.82 14.93 1.11 November 1991Ms. Mary Meays MW-2 10.10 11.51 1.41 San Joaquin County Public Health Services 10110/91 MW-3 9.42 10.39 -0.97 Environmental Health Division MW-4 16.09 14.60 -4.51 P.O. Box 2009 Mw-5 10.61 16.74 0.13 Stockton, California 95201 MW-6 10.25 10.a9 -0.24 I f Mw-1 9.82 10.57 0.75 i RE: Monthly Report, Groundwater Monitoring Activities/Remediation S stem Mw-2 10.10 16s2 o.a2 Performance Report, Tri-Valley Growers, 26200 Nowell Road, Thornton, California, MW-3 9.42 9.80 0.44 i 0!1 E191 ` ? Mw-4 16.09 13.45 .3.36 MW-5 10.61 10.31 0.3 Dear Mary: MW-8 10.25 10.20 0.05 i This Ietter report updates RESNA Industries Mw-1 9.82 10.25 0.43 x. f .1 ( SNA's} activities at Tri-Valley Growers' Thornton plant (Figure 1) during the month of October, I991. Activities this month included monitoring of groundwater, sampling for dissolved hydrocarbons from the treatment system MW-2 10.70 1o.as o.3s influent (well MW4) and carbon filter effluent, and operation and maintenance of h1W-3 9.42 9.53 -0.11 remediation system. the 11/11/91 ; MW-4 10.09 13,60 -3.61 7 The remediation system 1W-5 10,61 10.11 0.50 October 18, tion The y sem is eration,runningrate and drawdown was checked on October 10 and MW-6 10.25 9.75 _ 0.50 I liters per minute. and continues to pump at a rate of approximately 1.13 j Groundwater monitoring was conducted on October 10 and October 18, 1991, gradient maps reflect a depression created b Groundwater RiW4 {Figures 2 and 3 Thy Pumping of the groundwater in monitoring well The cone depression around the pumping w influence are demonstrated in these maps. The ell and the area of groundwater monitoring data is summarized in Table 1, ! Influent and effluent samples were collected on October 10, 1991. Samples were total petroleum hydrocarbons as gasoline(TPHG)and the gasoline constituents analyzed for y tuents benzene, toluene, ethIb t strew and xylenes(13TEX)by EPA methods 8020/8015. The sample collected from the influent stream was also analyzed for total oil and grease by PPA method e col ected OSI and r gease was not reported at or a _ rt e detection limits in the influent- ...... ample: Analytical ---- i _ TVGT109I.Wp ,, s IN