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1 Field Report Soil Borings and Hydropunch Groundwater Sampling San Joaquin County Mosquito and Vector Control District 200 N. Beckman Street Facility in Lodi, California July 5 through July 7 1994, ROY F W ESTON, INC (wESTON) conducted a site investigation at the San Joaquin County Mosquito and Vector Control District facility located at 200 N Beckman Street in Lodi, California The purpose of this investigation was to gather additional information needed for site closure certification All work was completed in accordance with the work plan dated February S, 1994 and additional requirements defined in letters from the San Joaquin County Public Health Services Environmental Health Division dated February 28, 1994 and June lb, 1994 Four soil borings were drilled using a Mobil B-53 drilling rig The borings were advanced to the water table with continuous flight hollow stem augers Soil samples were collected in brass tubes fitted in a 2-inch diameter California modified split spoon Each sample was screened for the presence of hydrocarbons using a photozonization detected (PID) If elevated readings were found, soil samples with the highest readings were selected for analysis Three samples from each boring were submitted for analysis of total petroleum hydrocarbons as gasoline (TPH-G) and benzene, toluene, ethylbenzene and xylene (BTEX) The ends of the metal sleeves containing soil samples selected for analysis were covered with Teflon sheeting and plastic end caps Each sleeve was Iabeled, sealed in a ziplock plastic bag and placed on ice in a cooler Groundwater samples were collected in boring SB3 using a Hydropunch® groundwater sampling tool The Hydropunch® was pushed 3 to 4 feet into the bottom of the boring, then the cover was retracted to expose the inlet screen The sample chamber was allowed to fill with groundwater Water samples were retrieved using a stainless steel bailer and transferred into laboratory supplied sample containers In boring SB3, the Hydropunch® was dry, and the groundwater sample was collected through the augers using a stainless steel bailer The sample containers were labeled, sealed in individual ziplock bags and placed on ice in a cooler All augers, bits, tool spaces and tools were steam cleaned to prevent cross contamination Split spoon samplers and sample tubes were decontaminated using an Alconox and water wash, potable water rinse and distilled water rinse Decontamination water was contamenzed in 55-gallon steel drums All cuttings were also placed in 55-gallon drums All drums were labeled and left on site At the conclusion of sampling, each boring was routed from the bottom to the to using a 5% g g P g bentonite/cement mixture The existing dry monitor wells MW-2 and MW-3 were also abandoned by grouting from the bottom to the top using the 5% bentonite/cement mixture All samples were delivered with chain-of-custody documentation to WESTON's analytical laboratory in Stockton, California ' SPKWrrsmcmvCpI wP OS NI%