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placed in the ground. Handling in the field requires a final wash with detergent or other similar solution. ' Some form of steam cleaning or high-pressure water-spraying technique combined with a low-sudsing non-phosphate detergent shall be employed followed by rinsing with potable water. The rinseate and drill cuttings may be spread on the ground near each site. If the well is located in a developed ' area, where surroundings are comprised of streets, sidewalks, and landscaping, it may be acceptable to discharge the rinseate adjacent to the well construction site if the soil infiltration rate is sufficient to prevent ponding. ' Otherwise, the rinseate and cuttings may be transported to a nearby land application area for spreading and disposal. Discharge to stormwater drains or surface water features is not acceptable. ' Should conditions change, or new information become available to suggest that proposed well sites are located in potential problem areas, it may be ' necessary to determine soil quality and water quality characteristics prior to well construction. If problems are confirmed, decontamination procedures shall be developed on a site- and contaminant-specific basis and thoroughly ' described in the Groundwater Well Project Description Addendum. In general, for any contaminated areas a contaminant-appropriate decontamination solution shall be used on all equipment between sites. All ' decontamination shall take place over a nonporous surface, and decontamination liquids contained for proper disposal. Drill cuttings, wastewater and rinseate shall be disposed of in accordance with all applicable federal, State, and local requirements and approved by the RWQCB. 2.4 Soil Samalinci and Borehole Lopping Completion and submittal of Water Well Drillers' Reports is a requirement of the ' California and San Joaquin County well standards. Accordingly, soil cuttings shall be logged to describe their texture, moisture content, grain size, and color. In the Lathrop area, the near surface deposits are characterized by discontinuous inter-bedded silty sand, sandy silt, silty clay, clay, and sand deposits. Continuous-core sampling in these types of sediment deposits is an option for providing sufficiently detailed information. In addition to soil cutting descriptions, the borehole log shall also report any changes in the drilling rate, caving of the borehole, or changes in water ' temperature or water levels. All observations shall be recorded and reported on a well boring and construction form (an example boring and construction form is provided in Appendix C). - 5 -