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rr � <br /> SIERRA <br /> Page 2 <br /> Detailed descriptions of subsurface sediments, sampling depths and OVM field <br /> measurements are shown on the boring log in Appendix D The Soil Classification system used <br /> for logging is also included in Appendix D <br /> Monitoring Well Installation <br /> Ground water was encountered during drilling at approximately 59 feet below ground <br /> surface The water bearing zone consists primarily of sandy lean clay Well construction details <br /> are shown on the boring log attached in Appendix D <br /> Drill cuttings were temporarily stored on-site pending disposal by Balch Petroleum of <br /> Milpitas,California Stearn-cleaning rinseate was transported and disposed of at the Chevron USA <br /> refinery in Richmond, California <br /> WELL DEVELOPMENT AND GROUND WATER SAMPLING <br /> Monitoring well MW-7 was developed on August 27, 1993 by SES personnel using a vented <br /> surge block and a submersible pump, in accordance with SES Standard Operating Procedure - <br /> Well Development (Appendix C) <br /> Water level measurements and ground water samples were collected in conjunction with <br /> the regularly scheduled quarterly monitoring event on September 15, 1993 Results from this <br /> sampling event will be submitted under separate cover <br /> The top of casing elevation of the new monitoring well will be surveyed to within 0 O 1 foot <br /> by Ron Miller, Professional Engineer#15816 Water level measurements, and ground water flow <br /> direction and gradient will be provided in the third quarter monitoring report <br /> ANALYTIC RESULTS <br /> Field observations and OVM measurements were used to select soil samples for analyses <br /> Soil samples from well MW-7 were analyzed for total purgeable petroleum hydrocarbons as <br /> gasoline by EPA Method 8015/5030 and for benzene, toluene, ethylbenzene and xylene (BTEX) <br /> by EPA Method 8020 Hydrocarbons as gasoline and BTEX were not detected in soil samples <br />