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J <br /> 1 <br /> WELL CONSTRUCTION REPORT <br />' USA STATION#110 - STOCKTON <br /> DECEMBER, 1995 <br />' 3.7 Sampling <br /> 3.7.1 Groundwater Sampling <br /> Groundwater samples were not collected immediately following well installation Instead, the <br /> new wells were sampled during routine quarterly groundwater monitoring in October, 1995 At <br /> that time samples were collected, labeled, stored and transported in accordance with accepted <br /> state guidelines and EPA protocol Sample collection methods and procedures are included in the <br /> "Third Quarter 1995, Project Status and Monitoring Report, which will be issued by Park in late <br />' December, 1995 <br /> 3.7.2 Soil Sampling <br /> Soil samples were collected at 5-foot ntervals to approximately 85-feet b s in each soil boring <br /> Samples were collected through the auger in three, 6-inch long brass sleeves with a 2-inch <br />' diameter split-spoon sampler The sampler was driven ahead of the auger by a 140-pound <br /> hammer allowed to free-fall 30-inches The brass sleeves and sampler were washed with an <br /> Alconox solution and rinsed with deionized water prior to each use <br /> One brass sleeve containing soil from each interval was capped, sealed, labeled in accordance with <br />' EPA protocol, recorded on a chain-of-custody (COC) form, placed in a cooler at 4 degrees <br /> centigrade or less, and transported to a California certified analytical laboratory under COC <br /> documentation for the specified analyses Another brass sleeve was used for lithologic <br />' description All field data regarding hthology, recovery and blow counts was recorded on the <br /> boring logs <br /> 3.8 Chemical Analyses <br /> 3.8.1 Groundwater Analyses <br />' Groundwater samples were collected from the three new wells as part of the routine quarterly <br /> groundwater monitoring in October, 1995 Samples were analyzed by Sierra Laboratories, a state <br />' certified laboratory, m accordance with state guidelines and EPA protocol. The samples were <br /> analyzed for TPH G, TPH D, BTEX, and total lead using EPA Methods 8015M, 8020 and 7421, <br /> respectively <br />' Analytical results from new wells MW-5-P and MW-6-P reported TPH-G, TPH-D, BTEX TEX and <br /> total Iead all below the laboratory reporting limits Analytical results from MW-4-P were below <br /> the laboratory reporting limits for TPH-G, BTEX and total lead Groundwater from MW-4 was <br /> not analyzed for TPH D Certified laboratory reports and COC documents for the three new <br />' wells are included in Appendix C <br /> 0 <br />' 5 <br />