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' ARCADIS GE RAG HTY&M I LLER <br /> i <br />' 5.6 QUARTERLY GROUNDWATER MONITORING RESULTS <br />' The First Quarter 1999 Groundwater Momtorung and Sampling Report at the former <br />' UNOCAL Service Station #0187 is attached in Appendix D The report documents the <br /> development and quarterly groundwater monitoring and sampling events performed by Gettler- <br />' Ryan, Inc (G R) On February 1, 1999, field personnel developed three wells (NP-2-22, NP- <br /> 2-60, and NP-2-116) On February 5, 1999, field personnel monitored sixteen wells and <br />' sampled fifteen wells (U-1 through U-9, NP-1-22, NP-1-65, NP-1-111, NP-2-22, NP-2-60, <br /> NP-2-116) at the Site <br /> Static groundwater levels were me4sured and all wells were checked for the presence <br />' of separate-phase hydrocarbons Separate-phase hydrocarbons were not present in the wells <br /> Static water level data and groundwater elevations are summarized in Table 1 of Appendix D <br /> A potentiometnc map is included as Figure I of Appendix D <br /> The direction of shallow groundwater flow at the Site is interpreted to be generally to <br />' the east northeast under a gradient of 004 to 009 ft/ft A shallow groundwater gradient, <br /> independently determined by calculation of the head and distance difference between NP-1-22 <br />' and NP-2-22,was consistent, at 0033 ft/ft, with the groundwater gradient calculated from the <br /> other shallow two-inch morutoring wells Direction of flow is from NP-1-22 to NP-2-22 The <br />' gradient calculated for the mid-level permeable zone beneath the Site between NP-1-65 and <br /> NP-2-60 was 0034 ft/ft, with the gradient being from NP-1-65 to NP-2-60 The gradient <br />' calculated for the deep-gradient permeable zone beneath the Site between NP-1-111 and NP- <br /> 2-116 was 0021 ft/ft,with the gradient being from NP-1-i 11 to NP-2-116 <br /> Vertical gradient was calculated at the Site using water elevations from the monitoring <br /> well nests at NP-1 and NP-2 Based on the water level elevations recorded on February 5, <br /> 1999 by Gettler-Ryan, the gradient between NP-1-22 and NP-1-65 is 003 ft/ft downward, and <br /> 28 <br />