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File No 2070-2 23 March 1994 Page 2 ' Due to the limited quantity of groundwater in monitoring wells MW-6 and MW-8, temperature, conductivity and pH readings were not obtained for these wells Monitoring well MW-6 was purged of approximately 2 0 gallons of groundwater while monitoring well MW-8 was purged of ' approximately 5 0 gallons of groundwater The purged groundwater was contained in a 55-gallon drum and stored on the site Following completion of the well purging, the wells were allowed to recharge Upon adequate recharge, each well was sampled via a discrete, disposable bailer The groundwater samples were placed in sterile containers, stored on ice and transported to the analytical laboratories of Curtis & ' Tompkins in Berkeley Laboratory analyses were conducted for the following parameters • total petroleum hydrocarbons (method 8015 modified), • "BTEX" (EPA method 602), • total lead (EPA method 7421) 4 0 Field Data and Site Determinations ' The local flow direction and gradient of the groundwater for the fourth quarter 1993 was calculated based on the static groundwater elevations measured in monitoring wells MW-1, MW-3 and MW-6 ' The local flow direction of the groundwater for the fourth quarter 1993 was determined to be toward the northeast with a gradient of 0 0019 rciri (see Figure 2) This is consistent with the east/northeast flow directions calculated for prior samplings While obtaining the groundwater samples, particular attention was paid to whether any noticeable petroleum hydrocarbon odor, discoloration or floating product was evident in the wells The following was noted during our sampling The groundwater sample collected from monitoring well MW-1 had a strong petroleum ' hydrocarbon odor and was discolored gray No floating product was noted • The groundwater in monitoring well MW-2 had a moderate petroleum hydrocarbon odor ' No discoloration or floating product was noted There was insufficient water in monitoring well MW-2 to collect a sample ' • The groundwater in monitoring well MW-3 had no noticeable odor, discoloration or floating product There was insufficient water in monitoring well MW-3 to collect a sample • Monitoring well MW-4 was dry at the time of our sampling • Monitoring well MW-5 was dry at the time of our sampling • The groundwater sample collected from monitoring well MW-6 had no noticeable odor, discoloration or floating product • Monitoring well MW-7 was dry at the time of our sampling ANDERSON CONSULTING I GROUP