Laserfiche WebLink
1 <br /> Tony Landis/Jeanine Jones <br /> Page 2 <br /> February 20, 1987 <br /> �I <br /> There is insufficient data to define the regional or local ground water <br /> gradient. It is not reasonable to assign a gradient of 0.35 feet per 100 feet <br /> based on one set of measurements across a site 200 feet long with tidal <br /> fluctuations of over 1 foot. The tidal fluctuations, unmeasured in all but one <br /> well, will mask any minor differences in average water level. <br /> RECOMMENDATIONS <br /> 1 ) Perform a records search for wells in the area. The Department of Water <br /> Resources has files available to the public. <br /> 2) Obtain water levels in wells Farther from the site. <br /> 3) Check for a sump pump in the vicinity of wells MW-8 and MW-9• <br /> h) Monitor the 12 wells at freg4ent intervals. Based on the lag and amplitude <br /> of tidal influence in well MW-8, water level measurements should be made at <br /> 15 minute intervals. Measurements should continue until a relationship of <br /> tides to lag times and amplitudes is apparent. Data should be displayed in <br /> tabular form and as contour maps showing response to tides. <br /> 5) Use these additional data to determine the direction of ground water flow <br /> and the gradient of the average ground water surface. Once the direction <br /> of ground water flow is known, the suitability of the background sample <br /> site can be determined. If the assumed background sample is found to be <br /> acceptable, then the results of the water quality program can be utilized. <br /> However, if the assumed background sample site is found not to be up <br /> gradient, then further assessment is required. <br /> i <br /> cc: Laura Yoshii, Chief, Program Policy & Evaluation <br /> li <br /> ki <br /> 'I <br />