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i <br /> R604 UPDATE 18 5-12-1993 <br /> INTRODUCTION <br /> • This report includes the results of events occurring at this site <br /> since the 17th Update Status Report, from March 30, though April <br /> 23 , 1993 <br /> LOCATION <br /> Regal Station 604 (parcel # 139-020-08) is located at 1448 N El <br /> Dorado and Harding Way, Stockton, San Joaquin County, California <br /> The site is in projected section 2 , T1N, R6E; MDB&M at <br /> approximately 14 feet above mean sea level Initial drilling <br /> (November, 1989) encountered ground water at approximately 32 <br /> feet below sea level (47, below the surface) and flowing in an <br /> east to southeasterly direction, see figures 1, 2 , and 3 <br /> SITE ACTIVITIES <br /> WEGE personnel have visited and/or monitored the site on April <br /> 15, 16 and 23 , 1993 Also carbon change-outs have occurred for <br /> one 85 gallon scrub on April 16 and on April 23 , 1993 all carbon <br /> scrubs were changed by EXCEL Trans Lawrence Tank Testing (LTT) <br /> has been contracted to visit the site twice a week and remove any <br /> condensate that has formed in the vacuum laterals, carbon scrubs <br /> and pumps and to also check for breakthrough of the carbon units, <br /> via odor, see Appendix B This condensate is removed to former <br /> Regal Station 603 and treated with the water treatment system at <br /> that site During the month of March 1993 , LTT has recovered and <br /> removed 7 25 gallons of condensated water. <br /> UPDATE STATUS REPORT #18 <br /> RESULTS - WATER <br /> GROUND WATER GRADIENT <br /> The ground water gradient map, Figure 4A, has been produced from <br /> the March 30, 1993 depth to water measurements These <br /> measurements show a relatively flat ridge shaped gradient flowing <br /> towards the northeast (MW4) and southeast (MW2) Figure 4B <br /> represents the most recent depth to water measurements obtained <br /> on April 15, 1993 . These measurements show a similar flow <br /> direction with a slight shaft towards MW7 Depth to ground water <br /> measurements show a continual rase an ground water elevation <br /> indicating a recharge event, as would be an expected result of <br /> the current rain season. <br /> TOTAL PETROLEUM HYDROCARBONS <br /> Floating Product: <br /> No floating product has ever been observed in any of the <br /> monitoring wells . <br /> y <br /> page 1 <br />