Laserfiche WebLink
Michael Leacox <br /> Page 9 of I 1 <br /> Groundwater investigation, Stockton, California - Implemented and managed a <br /> groundwater investigation to evaluate groundwater quality beneath a potential Toxic Pit <br /> Closure Act (TPCA) pond. Investigation included installing and sampling four 90-foot- <br /> deep monitoring wells. <br /> Groundwater investigation, Modesto, California - Designed and managed <br /> investigation to evaluate potential sources of elevated levels of nitrates present in <br /> groundwater downgradient of the facility. Source investigation included evaluation of <br /> nitrate levels in soils and pond water. Multiple sources were identified, and the lateral <br /> and vertical extent of impacted groundwater is currently being investigated. Project <br /> included installation of an interim groundwater extraction system. <br /> Soil and groundwater investigation, Sacramento County, California - Managed <br /> investigation to evaluate and define the lateral and vertical extent of impact soil and <br /> groundwater at an aerial applicator facility. Investigation included the installation of deep <br /> monitoring wells, sampling of onsite production wells, and collection of soil samples. <br /> Aquifer performance test, Tracy, California - Conducted and evaluated a 96-hour, <br /> 350-gallon per minute aquifer performance test to evaluate the feasibility of using <br /> groundwater resources at a biomass cogeneration facility. Project included the <br /> performance of step-tests to determine optimal pumping rates, evaluation of data, and <br /> assessment of potential influence upon existing production wells around the facility. <br /> Underground storage tank investigations, northern and southern California - <br /> Managed and implemented soil and groundwater investigations to evaluate the lateral <br /> and vertical extent of impacted soil and groundwater from leaking USTs. Assessments <br /> included gasoline, diesel, and waste oil, and dissolved free product migration studies. <br /> Investigative techniques included the use of soil gas surveys, drilling of monitoring wells <br /> and soil borings, and excavation of soils using backhoes. <br /> Deep well installation, Livingston, California - Managed, designed, and supervised <br /> the installation of a 10-inch steel-cased production well. This well was successfully used <br /> to replace a well which contained elevated levels of DBCP and nitrates. Investigation <br /> included an evaluation of regional and local groundwater quality and their relationship to <br /> geologic conditions. The well was designed for 500 gallons per minute (gpm), and was <br /> recently pump tested at 700 gpm. The well was screened at a depth of approximately <br /> 320-380 feet below ground surface, in a zone that tested free of DBCP contamination. <br /> Investigation included drilling of an 800-foot-deep pilot hole and collection of <br /> representative groundwater samples for Title 22 constituents in selected water-bearing <br /> zones. <br /> High-capacity well design and installation, Lodi, California - Assisted in the design <br /> of replacement agricultural and supply wells where DBCP, nitrates, and salinity problems <br /> were diagnosed. New domestic wells were drilled into underlying water-bearing zones <br /> that produced water of higher quality. Three high capacity (300-500 gpm) agricultural <br /> and production wells were designed to replace existing wells that were either impacted <br /> by or caused transport of elevated levels of TDS. In all cases, the wells pumped at rates <br /> higher than designed. Existing agricultural and supply wells were abandoned. <br /> Well siting study, Lodi, California - Managed and implemented well siting study <br /> involving evaluation of existing hydrogeologic, geologic, and geophysical data from a <br /> multilayered alluvial aquifer. Project included conducting and evaluating aquifer <br />