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John P. Cummings & Associates <br /> Environmental Consultants HEALT}1 <br /> iCvic"- <br /> Ph. (510) 505-0722 P.O. Box 2847 <br /> Fax (510) 791-3306 JJr. 1} F�r"t, CA 94536-2847 <br /> File No. 0293015.00 <br /> January 19, 1994 <br /> Peter Wallace <br /> 19431. N. DeVries Road <br /> Lodi, CA 95240 <br /> Re: Gradient Calculation <br /> 348 West Harding Way <br /> Stockton, CA <br /> Gear Mr. Wallace: <br /> John P. Cummings & Associates (JPCA) is pleased to present the <br /> following report on the gradient calculated by the depth to <br /> groundwater measurement data just collected for the Hess-Dubois <br /> site. The site is located at 348 West Harding Way, Stockton, CA. <br /> This work was required by the San Joaquin County Public Health <br /> Services, Environmental Health Division (SJPHS-EHD) . <br /> FIELD WORK <br /> •1 On January 18, 1994 , John P. Cummings of JPCA measured the depth to <br /> groundwater in the three wells at the Hess-Dubois site. He met <br /> Michael Infurna, an inspector with the SJPHS-EHD, at the subject <br /> site. The groundwater depth measurments were taken utilizing an <br /> electronic probe. The water depth was measured from a mark located <br /> on the top of the casing. The groundwater gradient data are <br /> presented in Table 1. The gradient is south southwesterly 0. 138 <br /> ft/ft. The groundwater gradient is depicted in Figure 1. <br /> TABLE 1 <br /> GROUNDWATER GRADIENT DATA <br /> (Elevations Measured on January 18 , 1994) <br /> Casing Water gce <br /> Well I.D. Elevation Depth Elevation <br /> MW 1 10* 42 . 70 -32 . 70 <br /> gv0 <br /> MW 2 10. 63 7- • 8 2 -3�Z..-19 <br /> MW 3 10.04 42 .84 -32 . 80 <br /> Measurements are in feet. <br /> * The top of the casing for MW-1 was arbitrarily set at 10. 00 feet. <br /> 1 <br /> 003q <br />