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t <br /> f s <br /> with teflon and sealed with plastic tightly wrapped with <br /> caps, <br /> tape, and kept in cold storage for transport to the chemical <br /> laboratory. r clay <br /> The borings were terminated in a non-ovate-ng Weariplaced n5 silty site <br /> zone. The drill cuttings freenom eplastach �clpending the chemical <br /> and covered with & mil visgplaced at least 2 feet abovethe <br /> results. Sand pack was placed <br /> request of the San <br /> uin <br /> slotted perforations. At a pea gravel aggregate concrete <br /> Environmental Health Division, vaults and <br /> Portland cement was <br /> grout was placed above the ted, watertight l(.Aing <br /> used to seal the flush-mounted, laced on top of the wells in <br /> locking waterproof caps were p the well. <br /> order to prevent surface runoff from entering <br /> B. Soil and Groundwater Conditions drilling <br /> The general soil conditions encountered duringdrilling <br /> at the <br /> consisted of compacted silty fine sand <br /> surface. Ths was <br /> somefrom <br /> tthin localized coarserew inches to I0and fsiltier zOnfine to <br /> layer with er is a coarser, <br /> encountered. Beneath this fine sand lay soils are <br /> medium quartz grainedsand which is bel zone. Below this Vzonep be the <br /> principal upper water bearing <br /> fine sand, then a silt, and <br /> generally finer beginning clay zone-where the borings <br /> finally a non water bearingsileYfj°m 25 to 30 feet in depth. <br /> were termi <br /> The <br /> at the <br /> 5.5 <br /> was encouannterleveltmeasurementsen 15 and ltakeneon February <br /> et <br /> Groundwater feet. Each <br /> time of drilling. <br /> 11, 1387 yielded water levels between l4 and laof <br /> . with a <br /> well was pursed of at Alcleanedracrylic baiee well lerwas then rlowered <br /> r pely <br /> ortable hand pump. <br /> for <br /> - down the well to retrieve a waarrandmputfi�h1tQldasst°rugmeatand <br /> sealed in a teflon capped 3 The Pump <br /> after each sampling <br /> transportation to the chemical laboratory. <br /> acrylic bailer were washed <br /> ashehe othoroughls of pura water were placed <br /> effort between wells. ovided by Manteca Bean Company and left <br /> in the 55 gallon drum p" <br /> on site pending chemical results. All of the wells exhibited <br /> fairly strong petroleum odoswatereend ®n tYce$rater samples. <br /> (fuels) were seen on the purged <br /> Cr Wellhead Elevation Surve <br /> sae Appendix B) . The <br /> Wellhead elevaWidirection at �n order to determine <br /> groundwater flow 26, 1987 at which time <br /> survey was completed on February <br /> additional water 11 (see <br /> �ieterl,ents and product depths were <br /> taken for each wel <br /> 2 <br />