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Project 113-26-04,05,Page 5 <br /> November 17,1995 <br /> Table 1 continued: Soil and Groundwater Sample Analysis Results <br /> March 1988 to March 1995 <br /> Cheaper! store #37 <br /> w rtkj <br /> «M1xv G} <br /> 2/93 B-W-1** ND ND ND ND 15 <br /> 2/93 B-W-2** 3,100 1200 62 80 230 <br /> 2/93 B-W-3** ND 1 1 ND ND 090 <br /> 2/93 B-W-4** 160,000 5,900 10,000 5,200 22,000 <br /> 2/93 B-W-5** 1 300,000 1 11,000 1 36,000 7,400 1 37,000 <br /> 2/93 B-W-6*" 1 20,000 1 150 1 490 700 1 2,200 <br /> * = sampling, analytical details unknown "*= groundwater grab sample <br /> mg/kg= parts per million in soil µg/L= parts per billion in water <br /> N D = not detected n/a= not analyzed <br /> The project documentation which follows relates to the work performed between <br /> August and October 1995, when 12 (14) soil borings were advanced on and off site <br /> and four groundwater monitoring wells were installed around the UST facility Soil <br /> and groundwater samples were obtained and analyzed Groundwater gradient and <br /> flow direction determinations were made <br /> Local Topography, Geology and Hydrology <br /> • The easternmost hills of the Diablo Range exist a few miles to the southwest and <br /> west from the site Tracy lies near the western edge of the Central Valley of <br /> California, and in the northwestern portion of the San Joaquin Valley. The east <br /> flowing Old River lies a few miles to the north and northeast from the site <br /> The topography of the site is fairly flat and level, with an elevation of about 29 feet <br /> above mean sea level (MSL) In the local area the topography slopes gently <br /> downward toward the north <br /> From earlier investigative work it was known that the subsurface materials were <br /> comprised mainly of unconsolidated clay with layers up to a few feet thick <br /> containing more and less silt and sand A groundwater table condition exists with <br /> respect to the shallowest groundwater bearing zone located between about 6 and 7 <br /> feet BGS with seasonal variation <br /> lIL METHODS AND PROCEDURES <br /> A work plan, addendums, and site safety plan were prepared and submitted to the <br /> San Joaquin County Health Services Department, Environmental Health Division <br /> is for review and approval to commence Upon approval, permits for drilling and well <br /> Parker Environmental Services, 190 East 7th Street, Pittsburg, CA 94565-2317 <br /> Phone (510) 439-1024 Fax (510) 439-2566 <br />