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W <br /> MTN <br /> October 19, 1991 <br /> Letter Report 2102 <br /> ,rhird-Quarte, Groundwater Monitoring <br /> Thornton, California <br /> 'Tri-Valley Gro"iers. A'— Third-Quarter Groundwater Monitoring Letter Report <br /> and total petroleum October 19, 1991 <br /> ie ethylbenzenes xylenes(BTEX)t Tri-Valley Growers, Thornton, California 2102 <br /> Samples were analyzed for benzene, <br /> toluene, methods 8020/9015. in addition, monitoring well <br /> CrpHG),by EF EPA method 5520 13&F' <br /> hydrocarbons as gasoline oil and grease (TOO)by If you have any questions regarding this Project, phase contact Sharon Young or Bill Channell <br /> mW1 was sampled for total reported above detection limits in at our Escalon Office(209) 838-3507. <br /> as not reported above <br /> hydrocarbon constituents were f <br /> No dissolved gasoline 9 1 MW2,MW3, MW5 or MW6. 011 and grease w hydrocarbons in the Respectfully, <br /> petroleum <br /> monitoring well'"'Wl The zero lines for total RESNA Industries <br /> -able 2) <br /> detection limits in UWl (T <br /> groundwater is plotted in Figure 5, so analyzed for 'BTEXP <br /> . purnping well (MW4) were al also analyzed for <br /> Influent and effluent samples from the e influent sample was Sharon A. Young <br /> 16 and September 12' Than increase in TPHs <br /> and the gasoline Microbiologist <br /> TPHG, and TOG on August results indicate collected nce the August 16 <br /> TPHD 0, September 12. Analytical nes in the influent samples coll e August 16 <br /> constituents benzene, toluene,and xylenes <br /> areshown to have decreased since the <br /> dT0G. No ALI <br /> of Tp14D an Gregory P. Stahl <br /> sampling round. 'EthYlbenzene level ndetectable levels sampling rounds. <br /> CA Registered Geologist No. 5023 <br /> arnpie recorded "I occured during the <br /> ,2(p <br /> sampling round. The on filter I (EFFCl)or FFC2) <br /> break-through from cub oratory (DHS certification <br /> '31 Lab d chain-of- ATTACHMIIqTS Figure 1: <br /> were pe in <br /> by Applied Analytic, laboratory reports an 9 Site Location Map <br /> nA <br /> zedin Table 2; the lab" Figure 2: Groundwater GradientMapLaboratory analyses (07/17/91) <br /> The analytical results aresutachment 2. Figure 3: Groundwater Gradient Map(08/19/91) <br /> n are Pres i <br /> Figure 4: <br /> custody docurnentatio ons recorded Groundwater Gradient Map(09/12/91) <br /> levels of pe <br /> rojeurn hydrocarb Figure 5: TPHG Isoconcentradon Contour Map <br /> to noaddectable RES requests that the sampling Table 1: Summary of Groundwater Monitoring <br /> history Of low will continue <br /> on a One-year p NW-5 and jvfW-6, Table 2- <br /> Based from MW-2, WNA personnel Summary of Lab Analysis of Water <br /> collected rformance, <br /> for samplesfrom quarterly to annually <br /> Samples <br /> ells be changed fr ch will iricludea report ddaffll�system pe -3,and <br /> schedule for these w am which Attachment 1: Well Purge Logs <br /> progr -I bNW <br /> the quarterly monitoring EX and TPHG from wells MW o be analyzed Attachment 2: Laboratory Data Sheets and Chain. <br /> with include analysis for BT MW-1 will als <br /> Quarterly monitoring will -4)and ef'luen" The sample-fromVO will continue to of-Custody Documentation <br /> remediation system influent(MNV ill not be analyzed for TPHD, N <br /> TOG . influent sample w necessary. PC: Beth Thayer <br /> for The system adjust purnping rates as <br /> performance and Yuan Quijano <br /> monitor system Pe <br /> OCT <br /> NJ AL <br /> PERMII/SERVIU <br /> -rV0QMW3-WP <br /> TVGQMM.wi> <br />