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t ' <br /> 3 John P. Cummings & Associates <br /> ' EnWronmen# I Con uui"Ai7 L <br /> ,. .. - <br /> 505-0722 P.O. Box 2847 <br /> Fax((510') 791-3306 9 PM 2-' 56 Fremont, CA5362847 <br /> File No. 02930`15. 00 <br /> February 1, 1994 <br /> Peter Wallace <br /> 19431 N. DeVries Road <br /> Lodi, CA 95240 <br /> Re: Revised Gradient Calculation <br /> 348 West Harding Way <br /> Stockton, CA <br /> Dear Mr. Wallace: <br /> John P. Cummings & Associates (JPCA) is pleased to present this <br /> report on the revised 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 /> • 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 measured from a mark located on the top of the <br /> casing. The groundwater gradient data are presented in Table 1 . <br /> The corrected gradient is north-northwesterly at 0. 020 ft/ft. The <br /> corrected groundwater gradient is depicted in Figure 1. <br /> TABLE 1 <br /> GROUNDWATER GRADIENT DATA <br /> (Elevations Measured on January 18, 1994) <br /> Casing Water wdrcr gxfxe <br /> Well I.D. Elevation _ Depth Elevation <br /> MW 1 10* 42, 70 -32 .70 <br /> MW 2 10. 63 42. 82 -32 . 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 /> � b <br />