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k" KLE1 N FELDER SOIL BORING WORK PLAN HARNEY LANE LANDFILL SAN JOAQUIN COUNTY APR E'NV;R,-/Y'JMEN11_AL HEALTH PERM DRILLING AND SAMPLING As per Kleinfelder's Solid Waste Assessment Test proposal dated August 2, 1990, Kleinfelder will assess leachate and the vadose zone underneath landfill areas at Harney Lane Landfill. It is our understanding that Mr. Gabriel Karam, San Joaquin County Public Works, Solid Waste Division previously submitted a copy of the SWAT proposal (as approved by the RWQCB) to Mr. Edward Padilla of your office. A total of four soil borings will be drilled at the site. These borings include SS-1 through SS-3 and BKG-1. Approximate boring locations are shown on Plate 1. To assess vadose zone conditions, two soil samples will be collected from each boring at depths of approximately.2 and 10 feet below the refuse/soil interface, based on visual observations by an experienced geologist. To assess leachate, soil samples will be taken from SS-1 through SS-3 at the refuse/soil interface. A seventh background soil sample will be collected from a location not likely to be affected by leakage from the landfill. The background sample will be collected from a depth and lithology similar to the potentially affected samples. Soil borings will be advanced using a truck-mounted drill ri e4ui ped with eight-inch hollow stem augers. The depth of the borings is estimated at 61 to t. During drillin&, an experienced environmental geologist will classify and log the soil, and collect soil samples for laboratory analysis. Soil samples will be collected approximately every five feet for field screening, lithologic logging, and potential chemical analysis. Samples are collected by advancing the boring to a point immediately above the desired sampling depth and then driving a Modified California Sampler, lined with three brass tubes, into the undisturbed soil. The sampler is then removed from the bottom of the boring. The bottom (third) tube is sealed with Teflon sheeting and tight-fittin.* plastic caps, labelled with a unique five-digit sample identification number, and immediately stored in an iced cooler under chain of custody for transport to the analytical laboratory. To reduce the potential for cross-contamination, augers and associated equipment will be steam cleaned prior to drilling each_ boring. In addition, sampling equipment will be cleaned water t�e Wt isodium phosphate wash and rinsed with distille r'prior to collecting each soil sample. Soil borings will be closed at the end of the day after the collection and logging of soil samples. No borings will be left open overnight.lit. If necessary grouting will be done on two consecutive days. Closure is accomplished by grouting the boring with a cement/3-4 percent bentonite slurry or with neat cement. The cement will be placed in the bottom of the borings with a tremmie pipe. Drill cuttings will be piled adjacent to the boreholes and will be transported and placed in the active landfill working face by Harney Lane Landfill site operators. F18-91-65 Copyright 1991 KLeinfeLder, Inc.