WORK PLANS - Laserfiche WebLink

Home Browse Search

Kennedy Jenks a quarterly basis. Quarterly reports present the results of the monitoring events and summarize the groundwater elevation and analytical trends observed. 1.3 Site Hydrology Historic groundwater level data is provided in Table 2. Over the Site history, the measurable groundwater elevation has ranged from a minimum of 7.32 feet above mean sea level (AMSL) in MW-1 to 49.68 feet (AMSL) in MW-2. The groundwater flow direction since December 2000 has typically been to the northwest and the groundwater gradient ranges from approximately 0.001 to 0.005 vertical feet per horizontal foot. Based upon Site boring logs, the upper 20 to 25 feet below ground surface (bgs) consists of sand, underlain by mixtures of sand and silt and a silt layer at approximately 58 to 60 feet bgs. The aquifer material is typically silty sand, and boreholes were drilled until a fine-grained soil layer such as a clay layer was encountered. 1.4 Existing Groundwater Monitoring Well Network TWG has constructed a total of five groundwater monitoring wells to monitor groundwater beneath the Facility. Wells The locations are shown on Figure 2. The monitoring well construction details are provided in Table 1 and logs are provided in Appendix A. Installation of wells MW-4 and MW-5 was documented in the Groundwater Monitoring Well Installation Report, prepared by Kennedy Jenks on 30 September 2004. Historical groundwater depths, elevations, and gradients are provided in Table 2, and discussed in the quarterly groundwater monitoring reports. Wells MW-1 and MW-2 were installed in 1995 using direct rotary methods, and MW-3 was installed in 2000 with hollow-stem augers. Wells MW-4 and MW-5 were installed in 2004 with hollow-stem augers. The total depths of these wells range from approximately 80 feet bgs in MW-1 and MW-2 to 56 feet bgs (MW-3). The wells are screened at depths of 35.5 to 55.5 feet bgs (MW-3 and MW-4), 40 to 60 feet bgs in MW-5, and 50 to 80 feet bgs (MW-1 and MW-2). As provided in Table 2, since 2015 wells MW-3, MW-4, or MW-5 have been dry or intermittently dry and prevented a reliable groundwater gradient analysis. However, in prior events the groundwater gradient direction was typically northwest to north-northwest. The historically assessed groundwater gradient direction indicates the locations of the five monitoring wells are suitable to monitoring groundwater quality. Based on the historic gradient directions, wells MW-1 and MW-3 are mainly hydraulically downgradient of the process water land application areas (LAAs) and upgradient of sanitary wastewater septic tank and leach field systems. MW-2 is considered to be located hydraulically upgradient of the LAAs, although MW-2 is slightly offset to the west and may not accurately represent background water quality directly upgradient of the LAAs. Well MW-4 is located in the southern part of the Site to assess the quality of the groundwater migrating from the land adjacent to, and immediately upgradient of, the Site. Well MW-5 is located to be downgradient of the septic tank and leach field systems, in the northwest corner of the Site, representing the farthest downgradient position. Monitoring Well Installation Work Plan, The Wine Group, Franzia Winery, Ripon, California Page 2 \\kjc.local\kjc-root\kj-offcelsfolprojects\is-proj1202612665002.00_twg ripon gw men well supportM-reportshwispltwg ripon men well install wp_020426.docx