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Pulsing the system has been evaluated. R604 UPDATE 20 7-16-1993 <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 visited and/or monitored the site on June 18, and <br /> July 7, 1993 On the June 18th visit a 55 gallon carbon scrub <br /> was added to the effluent, monthly vapor samples and vacuum/depth <br /> to water sampling/monitoring occurred. On the July 7th visit, <br /> depth to water and vacuum influence measurements were taken <br /> Also the effluent of the carbon scrub units was monitored for <br /> odor, there was none, and the flows from the various vapor <br /> extraction wells were logged Lawrence Tank Testing (LTT) has <br /> 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 These site visits have been reduced to once a week <br /> starting in June, 1993, see Appendix D This condensate is <br /> removed to former Regal Station 603 and treated with the water <br /> treatment system at that site LTT has recovered and removed 7 <br /> gallons of condensation water from May 5 - June 28 , 1993 <br /> UPDATE STATUS REPORT #20 <br /> RESULTS - WATER <br /> GROUND WATER GRADIENT <br /> The ground water gradient map, Figure 4A, has been produced from <br /> the May 14 , 1993 depth to water measurements These measurements <br /> show a relatively flat ridge shaped gradient flowing to the <br /> northeast (MW4) and southeast (MW2) Figure 4B represents the <br /> most recent depth to water measurements obtained on July 7, 1993 <br /> This figure used MW5 to control the ground water gradient <br /> contours . These measurements show a similar flow direction, but <br /> with utilizing MW5, a minor depression can be shown at MW5 (this <br /> is as expected from a vapor extraction well) and a steep flow <br /> direction trending north from MW7 towards the site . Depth to <br /> ground water measurements show a continual rise in ground water <br /> elevation and a continuance of the recharge event, as would be an <br /> expected result of the most recent rain season <br /> TOTAL PETROLEUM HYDROCARBONS <br /> Floating Product: <br /> No floating product has ever been observed in any of the <br /> monitoring wells or borings at this site <br /> page 3 <br />