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C7eoloica[Technics Inc. Page 3 Welt installation Report City of Escalon Project No. 750.2 January 30,2001 The boring (SB-101) was grouted through the drilling rods with a neat cement grout and the drill rig was moved over 4-feet. Drilling proceeded as described above. At a depth of 65- feet, grout from SB-101 began flooding into the current boring. The grout either migrated through the porous sediments or there was enough deflection in the boring that the drill bit entered the previous boring. The boring was grouted through the drilling rods with a neat cement grout. To avoid further problems, the drill rig was moved 10-feet east of MW-101 and drilling �.• proceeded as earlier described. The well was successfully installed at a depth of 89-feet bgs. �. 2.1.1 Soil Sampling Procedure Soil samples were collected for geological and analytical evaluation at five-foot intervals in the two water table wells. MW-101 was to be free drilled to a depth of 75 feet since it was drilled adjacent to MW-1. Soil samples were then to be collected at five-foot intervals from 75 feet to total depth. The first attempt at MW-101 was terminated at 115 feet bgs and the boring renamed SB-101; all sampling was performed in this boring. MW-101 was free drilled. A boring log providing sediment description using the USCS and field observations was maintained by a professional geologist working under the supervision of a registered geologist. Soil samples were collected in 6.0-inch brass liners using a 2.0-inch modified California split spoon sampler. All soil samples were sealed with Teflon sheets, capped with plastic end caps, labeled, and placed in a cooler at 4° Celsius for transport to the laboratory following Chain of Custody protocol. The OVM was used to screen the soil �-• samples. Details on the geology encountered during the completion of the soil sampling as well as the field observations are included in Section 3.2, Geology and Field Observations. 2.1.2 Soil Laboratory Analyses Five soil samples from MW-4 and MW-5 and four soil samples from SB-101 were submitted to Sherwood Laboratories of Hilmar, California (State Certified Laboratory #1400) for the following analysis: • Benzene, toluene, ethylbenzene and xylene(BTEX) by EPA method 8020 • Gasoline-range petroleum hydrocarbons (TPH-G) by EPA method 8015(m) • Methyl tertiary butyl ether (MTBE) by EPA method 8020 Two soil samples from each boring were sub-sampled and sent to Entech Analytical Labs, Inc. of Santa Clara, California (State Certified Laboratory#2346) for the following analysis: • Oxygenated fuel compounds (MTBE, DIPE, ETBE, TAME and TBA) by EPA �,. method 8260 A chain of custody was completed for all samples submitted and tracked to ensure sample integrity. ti..