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i <br /> • <br /> scrubbed with a brush in a bucket of tap water and detergent, <br /> rinsed in a second bucket of tap water and given a final rinse in <br /> a bucket of distilled water. All sampling procedures will be <br /> performed in accordance with WaterWork's Quality Assurance and <br /> Quality Control Plan (Appendix I) . <br /> 5.2 Monitoring Well installation <br /> All borings will be advanced 15 feet beyond static groundwater and <br /> converted to monitoring wells by the installation of 25 feet of <br /> slatted screen with casing to the surface. Screened interval will <br /> i <br /> be 25 feet in length to allow for water table fluctuations. All <br /> wells will be constructed of 2-inch diameter, flush-threaded, <br /> schedule 40 PVC screen and casing (Figure 7) . Screen slot size <br /> will be 0.010 inch, based on lithologic observations during <br /> previous drilling. Wells will be filter packed using an <br /> appropriate sand or equivalent, a two-foot thick bentonite seal <br /> placed above the filter pack and then an annular seal of neat <br /> cement will be tremmied into place. Wells will be completed below <br /> m grade in water-tight, street-rated well protectors. All wells will <br /> be fitted with water-tight, locking caps for security purposes. <br /> Actual completion depths and screen placements will be determined <br /> in the field based on hydrogeologic conditions encountered. All <br /> procedures and protocol for groundwater monitoring well <br /> construction will conform to the standards set by the California <br /> i <br /> Department of Water Resources and the Regional Water Quality <br /> Control Board (RWQCB) . San Joaquin County Public Health Services <br /> will be notified so that they may witness the placement of the <br /> annular seal. Drilling will be conducted under a C57 license using <br /> a hollow-stem auger drill rig. <br /> Following installation, monitoring wells will be developed using <br /> -« swab and bail method. Development water will be containerized 'Ln <br /> DOT 178 drums and stored on site pending determination of proper <br /> disposal method. <br /> The top, north side of the well casing will be surveyed relative to <br /> a common datum for determining groundwater gradient information. <br /> ChevronU B A Ina - 367 <br /> ear P03279 TLP <br />