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1 <br /> r <br /> sand, and gravel. The sediments actually encountered during <br /> drilling were fine to medium, poorly to medium-sorted, or <br /> well-graded sands and light gray to brown clays. The aquifer <br /> encountered during drilling was composed of poorly-graded medium <br /> sand with some gravel . <br /> rGroundwater was first encountered at 57 to 59 feet below ground <br /> surface (bgs ) . Static water levels were measured in each well <br /> ' on June 2, 1992. A groundwater surface contour map is enclosed <br /> as Figure 3. As shown, the groundwater flow direction is S-210- <br /> Wwith a gradient of approximately 0. 002 ft/ft. Data support- <br /> ing Uriah ` s calculations appears in Table 2 : <br /> ' Table 2- Groundwater Gradient Data for <br /> 305 South Hutchins Street, Lodi <br /> ' (Elevations measured on June 2, 1992) <br /> Elevation of Relative <br /> Well I.D. Well Traffic Box Depth to Water Elevation <br /> MW-1 100* 56 .46 ft. 43 . 54 <br /> ' MW-2 98. 99 55 . 42 ft. 43 . 57 <br /> MW-3 99 . 16 55.. 50 ft. 43 . 66 <br /> ------------------------------------------------------------ <br /> * Designated for MW-1 for purposes of calculation <br /> ' RECENT SUBSURFACE INVESTIGATION <br /> On April 16 and 17, 1992 , two (2 ) soil borings (designated EB- <br /> 8 and EB-11 ) were advanced at the locations shown in Figure <br /> 2 . On June 22-25 and 29, 1992, three additional borings ( EB- <br /> 7, EB-9, and EB--10 ) were advanced and converted into 2" diameter <br /> ' groundwater monitoring wells (MW-1 , MW-2 , and MW-3 , respective- <br /> ly) . Each of the borings was advanced with a truck--mounted <br /> drill rig equipped with 6-1" outside diameter, continuous flight, <br /> hollow-stem augers operated by employees of Soils Exploration <br /> ' Services, Inc. ( SES) of Vacaville, CA. Drilling and sampling <br /> was performed under the direction of Viorica-Adriana <br /> Constantinescu, Uriah staff hydrogeologist. <br /> ' Soil samples were collected at five foot intervals, beginning <br /> at five feet bgs, in a split-spoon sampler fitted with clean <br /> brass tubes 1 .9 inches in diameter by 6. 0 inches in length. <br /> The sampler was driven 18" into undisturbed soil using a standard <br /> 30-inch drop of a 140-pound hammer with the exception of samples <br /> acquired between 40 and 60 feet bgs in EB-11 at which time <br /> samples were collected from a 22" split-spoon sampler by driving <br /> a 1 . 9 inch by 6.0 inch clean brass tube into the soil core <br /> 3 . <br /> i <br />