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Djamond Lumber Manleca Quarterly Groundwater Monitonng Page S TABLE 1: Static Water Levels ober 15, N'OVOM11 i'Z. Afint7,192 Augtist 31, t991 (I:cet) 1991 [fw) (rmt) 1 (rw) SRK- MW1 Well Depth = 38' Screened Interval (23' - 38') NI 214S 2120 2545 SRK- MW2 Well Depth = 39' Screened Interval (24' - 39') NI 2.375 2152 2580 SRK - MW3 Well Depth = 39' Screened Interval (24' - 39') NI 2375 2210 2570 BEI -MW4 (Assumed to be MW2 in BEI Reports) Well Depth = 30' Screened Interval (15' - 30') 2567 NS NS 2555 BEI - MW5 (Assumed to be MW3 in BEI Reports) Well Depth = 30' Screened Interval (15' - 30') 2508 NS NS 2590 BEI - MW6 (Assumed to be MW1 to BEI Reports) Well Depth = 30' Screened Interval (15' - 30') 2508 NS NS 25 85 NOTES ' Static Hater levels measured from top of well casing using a Solnist Water Level Indicator NI = No sample collected because monitoring well had not yet been installed NS = No sample collected SRK contacted Mr Jim Podesta with the Manteca Public Works Department regarding subsurface groundwater information from private municipal and irrigation wells located within 2,000 feet of the site Mr Podesta cited the S12ring 1992 Semi-Annual Groundwater Report, produced by the San Joaquin County Flood Control and Water Conservation District This document contains groundwater contour maps which include the Diamond Lumber facility Mr Podesta reviewed the relevant maps contained in the Spring 1992 Semi-Annual Groundwater Report, and stated that the groundwater gradient is towards the northwest 44 It should also be noted that SRK was denied permission to Install an upgradlent monitoring well on the Southern Pacific right-ot-way located south of the site 5 0 GROUNDWATER SAMPLING Three additional casing volumes were purged from each of the SRK monitoring wells using a 4-inch submersible pump and braided PVC tubing Three casing volumes were purged from each of the BEI ' monitoring wells using ded'c ited disposable bailers equipped with nylon cord Tishould he noted that discrepancies In the location and the correlation of analytical data with the actual BEI monitoring well locations (BEI 1989 Report)were discovered during the October 1991 sampling event performed by SRK The locations of the BEI wells were included in the monitoring well location survey performed by Cella Barr and Associates, and are designated as BEI-MW4 (assumed to be MW-2, BEI 1989 Report), BEI-MW5 (assumed to be MW-3, BEI 1989 Report), and BEI-MW6 (assumed to be MW-1, BEI 1989 Report) r Steffen Robern and Kirsten 3xx+. 2-\1 ae 11 nrn so