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Diamond Lumber-Lodi Quarterly Groundwater Monitoring _ Page 4 <br /> casing volume was removed. This well was allowed to recharge for approximately one hour, then <br /> sampled. Analytical groundwater parameters included volatile hydrocarbons, BTEX and total lead. <br /> The constituents of BTEX or volatile hydrocarbons were not detected in groundwater samples <br /> collected from any of the three monitoring wells. Lead concentrations were detected in each of the <br /> monitoring wells. <br /> 3.0 SCOPE OF SERVICES <br /> 1� The scope of work for the Quarterly Groundwater Monitoring includes: <br /> Purging and sampling the wells according to PHS/EHD guidelines. <br /> • Shipping the groundwater samples under correct chain-of-custody procedures to a California <br /> licensed laboratory for analyses. <br /> • And measuring the static water level relative to the top of casing. <br /> 4.0 GROUNDWATER GRADIENT <br /> Prior to the April 1992 quarterly groundwater monitoring event, SRK retained the services of Cella <br /> Barr Associates to provide elevations at the top of well heads relative to a known datum, and the <br /> locations of the wells relative to on-site structures. This information is provided on Figure 1 (located <br /> in the pocket at the back of this report). Static water levels were measured in the monitoring wells <br /> installed by SRK on November 24, 1991, April 6, 1992, and September 1, 1992 using a Solinst water <br /> level meter. The static water levels are provided on Table 1. The locking caps were removed from <br /> each of the monitoring wells, and the water level in each well was allowed to equilibrate <br /> approximately 30 minutes before the groundwater levels were measured. <br /> TABLE 1: Static Water Levels <br /> Nt�vetnttcr 75,']991 f►gxil 7� 1992 Seple(bcr I, 1992 <br /> (fect; <br /> SRK MWl <br /> Well Depth = 65' Screened Interval (50' - fi5') 51.15 59.75 53.95 <br /> SRK - MW2 <br /> Well Depth = 60' Screened Interval (45' - 60') 51.40 50.00 54.15 <br /> SRK - MW3 <br /> Well Depth = 59' Screened Interval (44' - 59') 51.50 50.17 54.30 <br /> NOTES: <br /> Static water levels measured from top of well casing using a Solinst Water Level Indicator <br /> An estimate of the groundwater gradient was made by using the most recent static water elevations <br /> to complete an orthographic construction known as a 3-point problem (Davis, G.H., 1984, Structural <br /> Geology of Rocks and Regions: John Wiley & Sons, pp 210). Solving a 3-point problem requires <br /> Sieffen Robertson and Kirsten <br />