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ti.. _ _ <br /> Y �Awa <br /> July 8, 1988 AGS Job No. 38032-2 <br /> UNOCAL service station No. 6981, Stockton, Calizornia <br /> Gradient Calculations <br /> The ground-water gradient will be calculated to indicate the <br /> direction of ground-water flow at the site. The differences in <br /> elevation between the taps of the well casings will be measured <br /> with an automatic level. The depth to water below the top of j <br /> each well casing w:11 be measured with an electronic water-level <br /> indicator. These data will be combined to calculate the relative <br /> elevation of the ground-water surface in each well and the slope <br /> of the potentiometric surface across the site. <br /> Report �Prenarati.on <br /> z <br /> A preliminary report su-Lmarizing the soil stratigraphy, field and <br /> .. la:soratory procedures, well construction details, laboratory <br /> results, contaminant distri'mition, ar_d recommendations for <br /> further work necessary for the mitigation of soil and ground- <br /> water contamination will be supplied to UNOCAL Corporation. All <br /> information gathered during the study will be considered <br /> confidential and released only with the authorizaticn of UNOCAL. <br /> 16 <br /> Pl 1A0 4Ge0SYS,t0/nS <br /> r , <br />