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r � • <br /> 13 June 1997 <br /> AGE-NC Project No 97-0330 <br /> rPage 2 of 5 <br /> r and generally consist of moderate to poorly drained fine textured soils The soils are generally derived <br /> from both marine and non-manne sediment, and are generally formed in alluvium derived from mixed <br /> rock sources <br /> r <br /> 2 3 GROUND WATER DEPTH AND GRADIENT <br /> rAccording to the map titled Lanes Of Equal Depth Of Water Wells-Fall 1993, published by the San <br /> Joaquin County Flood Control and Water Conservation District, the estimated depth to ground water <br /> r at the property is approximately 80 feet below surface grade (bsg) The prevailing ground water flow <br /> direction in eastern. Stockton is generally toward the northeast, although flow directions may vary <br /> locally and seasonably <br /> rAccording to Mr Steve Sasson and Ms Margaret Lagorio of the PHS-EHD, the long term rise of <br /> ground water near the site occurs at approximately 50 feet below surface grade (bsg) <br /> r <br /> 3.0. PROCEDURES <br /> 3 1 SCOPE OF WORK <br /> rThe scope of work for this preliminary site assessment included advancement of two soil probe <br /> borings, collection of soil samples for laboratory analysis, and preparation of this report <br /> r <br /> 3 2 ADVANCEMENT OF SOIL PROBE BORINGS <br /> rOn 14 May 1997, two soil probe borings (P-1 and P-2) were advanced at the site Soil probe borings <br /> P-1 and P-2 were advanced vertically to depths of 25 and 50 feet bsg, respectively, near the former <br />' UST and dispenser island area Advancement of all probe borings was accomplished utilizing AGE's <br /> van-mounted Geoprobe 5400 The Geoprobe was equipped with 1 125-inch diameter probe rods <br /> with an attached 2 15-inch diameter soil sampler Soil probe boring locations are depicted on Figure <br /> r2 <br /> r3 3 SOIL SAMPLE COLLECTION <br /> r Discrete soil samples were collected at five-foot intervals beginning at 15 feet bsg in P-1 and P-2 <br /> using a Geoprobe soil sampling assembly loaded with pre-cleaned 1 125-inch by 6-inch brass sleeves <br /> Soil samples were preserved by covering both ends of brass sleeve with Teflon sheets, capping and <br /> seahng with tape Upon preservation, each sample sleeve was labeled with soil probe boring location, <br /> r <br />