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4 F Mr Randall K Stephenson October 24, 1994 Page 2 in Enclosure A A ground water sample collected from each monitoring well (MW-1, MW-2, and MW-3) was submitted for laboratory analysis of BTEX and TPHg by Cal-EPA and EPA-approved methods Soil Borings Soil samples collected from the borings consisted of sandy silt, silt, silty sand, silty clay, sandy clay, sandy clayey silt, and sand For example, soil samples collected from the soil boring for monitoring well MW-1 are described in detail by depth as follows from below the gravel fill road base to 14 feet below grade, the soil encountered consisted of sandy silt, from 14 to 23 feet below grade, sandy clay was encountered, under the sandy clay, sandy silt was encountered to 48 feet below grade, from 48 to 54 feet below grade, silt and silty clay was encountered, from 54 to 59 feet below grade, sand was encountered, from 59 to 74 feet below grade, sandy silt was encountered, from 74 to 83 feet, silty clay was encountered, from 83 to 88 feet, sandy silt was encountered, under the sandy silt, silty sand was present to 95 feet, the total depth of the bonng Contacts between the soil types vaned between gradational and sharp Soil boring logs containing detailed descriptions of soil conditions encountered in each boring are included in Enclosure B Ground Water Level Measurements Depth to ground water was measured in monitoring wells MW-L through MW-3 on July 8, 1994 (Table 1) Copies of field notes documenting work performed at the site on July 5, 6, and 8, 1994, are presented in Enclosure D Ground water was present at depths ranging from 69 98 (MW-1) to 70 28 (MW-3) feet below the top of each well casing Each monitoring well elevation was surveyed by Jess Stanley Surveying of Oakdale, California, on August 16, 1994, relative to mean sea level to the nearest 0 01 foot Survey notes are contained in Enclosure E Measurable layers of liquid petroleum hydrocarbons were not observed in any of the monitoring wells in July 1994 Water level measurements made on July 8, 1994, indicate an inferred direction of ground water flow toward the east-southeast as illustrated on Figure 3 The calculated ground water gradient is less than 0 01 foot per foot Soil Sample Analytical Results A portion of each soil sample collected from the soil borings was sealed in a plastic bag and allowed to reach ambient air temperature The headspace of the bag was then screened in the field with a phototonization detector (PID) PID readings did not indicate the presence of organic vapors in soil samples recovered from soil borings for monitoring wells MW-1, MW-2, or MW-3 ACTON - MICKELSON - lipt13 m3 van DAPI, INC Consulting Scientists, Engineers,and Geologists