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LEVINE•FRICKE <br /> sampling will be conducted in the field area to investigate the <br /> possibility that methane gas is present in shallow soils in areas <br /> r where high organic content soils were previously encountered. <br /> a <br /> -- Northeast Area <br /> Soil and/or ground-water samples will be collected from seven <br /> F soil borings in the vicinity of the quonset hut, the former <br /> underground gasoline tank location, and the above-ground diesel <br /> tanks located in the northeast corner of the Site (Figure 4) . <br /> Samples will be collected in this portion of the Site to assess <br /> whether significant releases of agricultural chemicals and/or <br /> �- fuel hydrocarbons have occurred. Each of the northwest area soil <br /> borings will be tested for methane gas and/or fuel hydrocarbons <br /> f using a portable OVA. Soil samples collected for analysis of <br /> agricultural chemicals in the northeast area will be collected <br /> "- from the 1- to 3- foot depth range; soil samples collected for <br /> total petroleum hydrocarbons (TPH) analysis will be collected at <br /> depths where increased OVA readings or staining of the soil, if <br /> r- any, are observed and at the depths where ground water is encoun- <br /> tered for that portion of the Site. Water table depth will be <br /> determined in the field at the time of sample collection. <br /> If possible, ground-water samples will be collected from four of <br /> ' . the borings in the northeast corner area to evaluate whether fuel <br /> products from possible improper storage and handling of diesel <br /> fuel and/or possible release of gasoline stored in the under- <br /> ground tank in that portion of the Site have affected ground <br /> water. <br /> E If fuel-affected soils and/or ground water are encountered during <br /> the field investigation in this area, additional borings may be <br /> .� recommended to define the extent of chemical migration in soil <br /> and ground water. In this event, Grupe Development Co. will be <br /> f contacted and apprised of the situation. Additional borings will <br /> not be drilled without obtaining the approval of Grupe Develop- <br /> ment Co. <br /> Northwest Boundary <br /> Ground-water samples will be collected from three (3) soil bor- <br /> ings located along the northwestern Site boundary (Figure 2) . <br /> Discarded equipment, vehicles, and containers, including various <br /> 55-gallon drums, were observed by Levine•Fricke personnel on the <br /> property adjacent to and northwest of the Site during a drive-by <br /> inspection of the vicinity of the Brookside Ranch on October 19, <br /> r 1988. Ground-water samples collected from shallow soil borings <br /> along the northwest boundary of the Site will be collected to <br /> evaluate the possibility that chemicals have migrated on to the <br /> r Site via shallow ground water from the property adjacent to and <br /> to the northwest of the Site. Soil borings along the northwest <br /> r <br /> -5- <br />