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I <br /> Groundwater Sampling <br /> Each monitoring well was sampled at least once between June 26 and September 23, <br /> 1991. Observations made before sampling included total well depth, depth to water, <br /> and presence of petroleum sheens or free product on the water surface. A Grundfos <br /> submersible pump was used to extract groundwater samples. <br /> Before sampling each well, the pump and discharge hose was cleaned by operating the <br /> pump in a bucket containing a detergent solution (Alkonox) for a minimum of 10 <br /> minutes, followed by a clean water rinse for a minimum of 10 minutes. <br /> jAfter pump and discharge hose cleaning, a minimum of three well volumes of <br /> groundwater were purged from each well. While purging the wells, the water pH, <br /> electrical conductivity, and temperature were recorded. <br /> Samples were then collected and sealed in appropriate containers, stored in an ice- <br /> filled cooler, and delivered to the CH2M HILL Analytical Laboratory in Redding, <br /> California. All groundwater samples were analyzed for BTEX, TPH-gas, and lead. <br /> One sample was also analyzed for conventional water-quality parameters (major ions, <br /> I� hardness, alkalinity, total dissolved solids (TDS), electrical conductivity (EC), pH, <br /> L methylene blue active substance (MBAS), and coliform bacteria). <br /> t <br /> Area Well Location Survey <br /> A survey of water-producing wells within one mile of Plant 33 was performed by <br /> contacting local utilities, including California Water Services and the City of Stockton, <br /> and other agencies (Appendix C). Results of the survey are presented in Section 3. <br /> Waste Management <br /> r Soil cuttings from the hollow-stem auger borings are temporarily being stored on plastic <br /> sheets (visqueen) at the Del Monte Disco area.. Mud cuttings from the mud rotary <br /> drilling are temporarily being stored in a bermed, visqueen-lined area at the Disco lot. <br /> �1 Groundwater development and purged water were stored in properly labeled U.S. <br /> Department of Transportation 55-gallon drums. The drummed water was handled by <br /> Del Monte's permitted water discharge and wastewater systems. Water determined to <br /> be hazardous'was hauled and disposed of by Romic Chemical located in East Palo <br /> f Alto, California (EPA ID: CAD009452657), under contract with Del Monte. <br /> I <br /> 5 . <br /> { <br /> sF0316041RP1003.51 2-6 <br /> I <br />