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r Environmental Health Division (PHS/EHD) agreed. The gradient data is included in Table 3. • 3.0 PROCEDURES 3.1 Monitoring Well Purging On_December 28,_199_4,the water levels in each well were measured relative to the top of the casing using a Solinst water level meter (Table 3). No free hydrocarbon product was ' observed in any of the wells. -A bailer was used to remove standing water from each well to stabilize temperature, pH and conductivity (Appendix A). Groundwater parameters were measured at one-gallon intervals using an ICM water analyzer. The purge water was stored in 55-gallon drums on-site. ' Five gallons of water were removed from NMI Hov,,ever, MW-1 was bailed,dry after removing only three gallons of water. Less than one=half gallon of water was removed from MW before it went dry. ' 3.2 Sample Collection and Analysis ' After purging, water samples were collected using disposable plastic bailers. Samples from MW-1 and MW-2 were collected on December 28, 1994; because of poor recharge, MSV-3 was sampled on December 29, 1994. N sample was collected in three 40-m1 EPA vials. The samples were then placed in a Each p p chilled container and transported under chain-of-custody procedure to Alpha Analytical Laboratories (AAL) in Ukiah, California. Each sample was analyzed for TPH as Stoddard solvent and BTE&X in accordance with EPA methods GCFID/5030 and 602, respectively. 4.0 FINDINGS ' 4.1 Groundwater Elevation and Gradient ' The elevation of groundwater in each well was calculated by subtracting the groundwater depth from the surveyed casing elevation (Table 3). The average depth to groundwater at the site'in December 1994 was 44.80 feet.'This represents approximately a three-quarter of ' a foot increase in groundwater between October 1994 and December 1994. The groundwater gradient and flow direction in December was calculated to be 0.011_f/ft directed N 3° W (Figure 3). The gradient and flow direction is consistent with previous calculations: ' 0-e0.A.&kr-i1- 6 • He DuBos QI24n2-26-44"