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07 August I998 AGE-NC Project No. 97-0327 Page 3 of 5 States Department of Agriculture Soil Conservation Service in 1992, the site area is within the Jackson-Hallenbeck-Stockton (JHS) association. The JHS soils are located within basins, and generally consist of moderate to poorly drained fine textured soils. The soils are generally derived from both marine and non-marine sediment, and are generally formed in alluvium derived from mixed rock sources. 2.5. GROUND WATER DEPTH AND FLOW DIRECTION Based upon the map entitled Lines Of Equal Depth To Groundwater-Spring 1996, prepared by the San Joaquin County Flood Control and Water Conservation District (FCD&WCD), ground water depth at the site is approximately 55 feet bsg; review of Lines of Equal Elevation of Groundivater Spring 1996 (FCD&WCD) depicts the regional ground water flow direction towards the northeast. However, flow directions may vary locally and seasonably. 3.0. SCOPE OF WORK 3.1. PROBING AND SAMPLING AGI; proposes to initially advance at least four soil probe borings near the UST area to depths of approximately 40 feet bsg. Probe boring will be advanced using a Geoprobe 5400 soil probing unit. However. should field indications suggest that petroleum hydrocarbon impacted soil is located at depths greater than 40 feet bsg, probe borings will be advanced until there are no field indications of petroleum hydrocarbons. Furthermore, additional soil probe borings may be required to fully delineate the lateral and vertical extent of hydrocarbon-impacted soil. Proposed soil probe boring locations are illustrated on Figure 2, Discrete soil samples will be collected at five-foot intervals beginning at a depth of 5 feet bsg utilizing a Geoprobe soil sampling assembly loaded with pre-cleaned 1.125-inch by 6-inch brass sleeves. At least one soil probe boring will be continuously sampled utilizing a Geoprobe 48-inch macro core sampler. Sol] samples will be preserved by covering both ends of the second brass sleeve with Teflon sheets, plastic end caps and sealed with tape. Each sample sleeve will be labeled with the following information: soil probe boring Iocation, depth, time, date and samplers initials. Soils are to be described using the Unified Soil Classification System (USCS). Soil sample descriptions and PID screening results will be summarized on boring logs prepared in a preliminary site assessment report. Proposed soil boring locations are illustrated on Figure 2. Fallowing borehole advancement, portland Advanced GeoEnvironniental,Inc..