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2 FIELD ACTIVITIES <br /> This section contains a brief chronology and description of the of the survey, redevelopment, <br /> and sampling activities. <br /> S_ul`Vey <br /> On 4 F4 February 1994, Tom O. Morrow, Inc. (license No 5161) surveyed the positions of the <br /> existing monitor wells, the previous borings, and miscellaneous surface structures The areal <br /> coordinates were based on the relative reference of 1000N/1000E assigned by Tom O.Morrow, <br /> Inc to the southeast corner of the perimeter fence Elevations were based on City of Lodi <br /> Benchmark NO. 420 (elevation 53.78). A copy of the surveyors map as included in Appendix <br /> A. <br /> Redevelopment <br /> On 4 February 1994, Ms Zoe Aguiar (contract geologist) and Cris Hamilton checked each <br /> monitor well for the potential presence of an immiscible layer, recorded the depth (from top of <br /> casing) to groundwater and to total well depth, and (re)developed the monitor wells. An MMC <br /> Oil/Water interface probe was used to evaluate the presence of an immiscible layer, and measure <br /> the depth to groundwater and total well depth. Subsequently, a disposable bailer was used to <br /> qualitatively check for an immiscible layer potentially not measured by the interface probe All <br /> equipment used on multiple wells was washed using an Alcanox solution and rinsed with <br /> distilled water between wells. Purge and sample water was contained an DOT rated 55-gallon <br /> drums, labeled, and left onsite pending analytical results Each of the wells was capped and <br />' locked at the end of each field day. <br /> NM-1 was found unlocked and uncapped, and the vault box bolts were missing Ms Aguaar <br /> observed no immiscible layer on MW-1 She measured the depth to water at 47.93 feet (from <br /> top of casing [TOC]) and total depth at 57 70 feet (bgs) Because the well is recorded as being <br /> 60 feet deep and the bottom measurement was "mushy", some silting of the well has probably <br /> occurred. <br /> After collecting the above measurements, Ms. Aguiar used a disposable bailer weighted with <br /> sand and sealed, and a weighted PVC bailer to develop MW-1 Development consisted of <br /> alternating between surging along the screened interval and turbid water removal. Initially the <br /> water was odiferous and muddy. After approximately 2-112 hours and 14 purged gallons the - <br /> water cleared to slightly muddy A total of approximately 20 gallons of water were purged from <br /> MW-1 <br /> MW-2 was locked and capped but the vault box bolts were massing. Ms. Aguiar observed no <br /> immiscible layer on MW-2 She measured the depth to water at 48.70 feet (TOC) and total <br /> depth at 57.95 feet (bgs). Development protocol was identical to that employed for MW-1. <br /> Initially removed water was relatively free of fines. Because it was apparent that MW-2 had <br /> 3 <br />