COMPLIANCE INFO - Laserfiche WebLink

Home Browse Search

Clayton EN\ RRW,.IFVTAl Co \SLLT4NTS 1.0 INTRODUCTION Clayton Environmental Consultants, Inc. was retained by City of Stockton to develop a work plan for further subsurface investigations along the proposed sewer project at the Rough and Ready Island in Stockton, California (Figure 1). This project was authorized by City of Stockton Project Manager, Mr. Wayne Smith. 2.0 BACKGROUND According to information provided to Clayton by City of Stockton, four boreholes (B- 1 through B-4) and six monitoring (MW-1 through MW-6) wells were installed in various location along the proposed sewer interceptor. The soil and groundwater samples collected from the boreholes and the monitoring wells contained acetone, PCBs, benzene, gasoline and various metals. The summary of the analytical results for the soil and groundwater samples is included in Appendix A. 3.0 SCOPE OF WORK The purpose of this investigation is to further determine extent of soil and groundwater beneath the island along the proposed sewer interceptor. The scope of this work plan is based on the information and bid requirements provided by Mr. Smith on June 27, 1994. 3.1 HEALTH AND SAFETY PLAN Before commencing the field activities A health and safety plan will be prepared for the work outlined in this work plan. The health and safety plan will be in accordance with the requirements of Title 29 of the Code of Federal Regulations, Section 1910.120 (29 CFR 1910.120) and California Occupational Safety and Health Administration (Cal/OSHA) General Industry Safety Order (GISO) 5192. 3.2 BOREHOLE DRILLING AND MONITORING WELLS INSTALLATION Clayton will install one borehole (B-5) and seven monitoring wells (MW-7 through MW-13) along the proposed location of the sewer interceptor to monitor the soil and groundwater for the presence of hydrocarbons and metals. The proposed borehole and monitoring well locations are shown in Figure 2. During the drilling of the borehole and monitoring wells, a Clayton geologist will log the soil characteristics in the field using the Unified Soil Classification System. Distinguishing features such as color, odor, and relative soil moisture content will be noted. Drilling activities will be conducted in accordance with the Regional Water Quality Control Board (RWQCB) guidelines and Clayton's Drilling, Well Construction, and Sampling Protocols for Borehole/Monitoring Well Installation (Appendix B), under the supervision of a civil engineer or a geologist registered in the State of California. The borehole will be drilled to an approximate depth of 10 feet below ground surface (bgs). The monitoring wells will be drilled to a depth of 20 feet bgs. Clayton will collect soil samples at 5 foot intervals from the monitoring wells MW-7 and MW-8, and at 2, 4, 6, and 10 feet bgs from the borehole and monitoring wells MW-9 through 1 ACI'IVE5680600.WPN