WORK PLANS - Laserfiche WebLink

Home Browse Search

KEI-P89-1104 .P4 I` July 19, 1990 Page 2 Mr. Harlin Knoll' of the SJCPHS, per telephone conversations on February 7 and March 8, 1990, has required that this water well be properly destroyed due to the levels of TPH as gasoline indicated in the laboratory analyses results and that one additional water sample be collected after all piping and the pump are removed from the well, and the well purged of at least three to four well volumes. A site inspection conducted on March 15, 1990 by Mr. Don Braun of KEI, and Mr. Harlin Knoll of the SJCPHS indicates that the vicinity of the existing well has been paved with asphaltic concrete and that an old concrete Christy box was placed around the well and remaining piping. The well seal appeared in tact. The well casing was locally exposed and appeared to be steel and about six-inches in diameter. The service station was connected to the municipal water system and disconnected from the on-site water well prior to April, 1990. Details of the existing water well at the site were researc- hed at the California Department of Water Resources (DWR) in Sacramento. Mrs. Betty Swatsenbarg of the DWR reviewed the State records on March 14, 1990 and reported that no records were available for this well at the DWR. Based on Mrs. Swatsenbarg's extensive experience at the DWR, the subject water well was probably drilled and installed prior to 1951. At that time, steel casings were driven into the subsurface and the remainder of the wells were generally open below the casing. On April 23, 1990, an attempt was made to destroy the existing six-inch diameter water well by West Hazmat of Rancho Cordova, California. The proposed plan involved drilling out the well casing, using 12-inch O.D. (5-1/4- inch I.D. ) hollow-stem augers, to the total depth of the casing; pulling out the old casing; redrilling the well to the full depth, and pressure grouting the well using a I tremie pipe and a neat cement grout. During field activities on April 23 , 1990, the old pump (5 feet long) and pump casing (50 feet long) were removed from the well and stored on-site for future disposal. The total depth of the well was measured at 135 feet with the static water level measured at 55 feet. The length of the existing i casing could not be determined with the equipment on-site. ' Approximately 135 gallons of water were bailed from the water well using a clean stainless steel bailer. A water i'