Laserfiche WebLink
KEI-P89-1104 .R7 <br /> December 10, 1990 <br /> Page 7 <br /> A well destruction work plan was prepared by KEI (KEI-P89-1104 .P4) <br /> dated July 19, 1990 for the satisfactory destruction of the <br /> presently abandoned water well. Special tools are required for <br /> this work and Purviance Drillers are actively working towards <br /> completion of tool construction. Once the special tools have been <br /> constructed, KEI is prepared to destroy the existing abandoned <br /> water well. <br /> FIELD ACTIVITIES <br /> On October 10 and 11, 1990, four two-inch diameter monitoring wells <br /> (designated as MW1, MW2 , MW3 and MW4 on the attached Site Plan, <br /> Figure 1) were installed at the site. The wells were drilled, <br /> constructed and completed in accordance with the guidelines of the <br /> Regional Water Quality Control Board (RWQCB) , and the California <br /> Well Standards Bulletin 74-90. <br /> The subsurface materials penetrated and details of the construction <br /> of the wells are described in the attached Boring Logs. <br /> The monitoring wells were drilled and completed to total depths <br /> ranging from 69 to 74 feet below grade. Ground water was en- <br /> countered at depths ranging from 58 . 5 to 59. 5 feet beneath ground <br /> surface during drilling. Soil samples were taken for laboratory <br /> analysis and lithologic logging purposes at a maximum of 5 foot <br /> intervals, significant changes in lithology, obvious areas of <br /> contamination, and at the soil/ground water interface beginning at <br /> a depth of approximately 5 feet below grade until ground water was <br /> encountered. Soil samples were obtained below the first en- <br /> countered ground water for lithologic logging purposes only at the <br /> depths indicated on the attached Boring Logs. The undisturbed soil <br /> samples were taken by driving a California-modified split-spoon <br /> sampler lined with brass liners ahead of the drilling augers. The <br /> two--inch diameter brass liners holding the samples were sealed with <br /> aluminum foil, plastic caps and tape and placed in plastic zip-lock <br /> baggies, and stored in a cooled ice chest for delivery to a <br /> certified laboratory. Each well casing was installed with a <br /> watertight cap and padlock. A round, watertight, flush-mounted <br /> well cover was cemented in place over each well casing. Well <br /> elevations were surveyed by a licensed land surveyor to Mean Sea <br /> Level and to a vertical accuracy of 0. 01 feet. <br />