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R604 UPDATE 13 11-24-1992 <br /> 5 Perform monthly monitoring and sampling of the <br /> vapor stream using the GC-PID 10 S 50 chromatograph <br /> and include the results in a monthly update status <br /> report <br /> UPDATE STATUS REPORT 13 SEPTEMBER 11 - NOVEMBER 17 1992 . <br /> LOCATION <br /> Regal Station 604 (parcel # 139-020-08) is located at 1448 N E1 <br /> Dorado and Harding Way, Stockton, San Joaquin County, California . <br /> The site is in projected section 2 , TIN, R6E; MDB&M at <br /> approximately 14 feet above mean sea level . Initial drilling <br /> (November, 1989) encountered ground water at approximately 32 feet <br /> below sea level (47, below the surface) and flowing in an east to <br /> southeasterly direction, see figures 1, 2 , and 3A <br /> WELL SAMPLING AND ANALYTICAL TECHNIQUES <br /> Depth to ground water and vacuum measurements were obtained from <br /> all of the ground water monitoring wells on November 17, 1992 <br /> Nolte and Associates, a California certified surveying company, <br /> surveyed the top of casing and plotted well locations (relative to <br /> one another) on October 1, 1992 The elevation datum used for <br /> this site, was the City of Stockton Bench Mark #22 , elevation <br /> 12 061 , see Appendix A Depth to top of fluid and ground water <br /> measurements were obtained using a clean product water interface <br /> probe The probe, lowered into the well attached to a tape <br /> calibrated in 0 1 foot intervals, signals at the contact of <br /> floating product and-at the top of ground water The measurement <br /> is obtained from the calibrated tape reading adjacent to a <br /> reference point on the casing The probe is cleaned with <br /> trisodium phosphate soapy water, with a distilled water rinse, <br /> before measuring the next well Measurements are started at the <br /> historically cleanest wells and progressed to the dirtiest wells . <br /> All depth to ground water measurements were obtained prior to <br /> purging the wells for sampling The depth to water is then <br /> subtracted from the elevation of the casings reference point for a <br /> corrected ground water elevation A computer generated gradient <br /> program was not utilized The more interpretive gradient map was <br /> developed by calculating the gradient from each well to all <br /> surrounding wells (difference in ground water elevations/distance <br /> between wells) , ie MW1 to MW2, MW to MW3 , MW1 to MW4 , and MW1 to <br /> MW6 Depth to ground water data from MW5 is not used, this well <br /> was installed in a slant boring and produces anomalous highs when <br /> used From these gradient lines, data points representing the <br /> contact for the proposed contours are plotted along each <br /> individual line . Once the data points have been plotted between <br /> all the wells, the data points representing a given gradient <br /> elevation (-45 foot contour, for example) are connected with site <br /> specific factors, ie incorporating conditions caused by local <br /> geology, hydrogeology, utility trenches, etc . These are used to <br /> control the contour between data points This site is presently <br /> page 2 <br />