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ADDITIONAL GROUND WATER MONITORING WELL INSTALLATION AND QUARTERLY GROUND WATER MONITORING REPORT FIRST QUARTER 1992 Ekon Stahon R/S 7-3708 2705 Country Club Boulevard Stockton, Cahforma Delta Project No 40-91-838 Page 2 February 10 & 11, 1992 Three soil borings were advanced to a depth of approximately 26 5 feet ' below grade and completed as ground water monitoring wells MW-4, MW-5 and MW-6 Select soil samples were submitted for laboratory ' analysis of benzene, toluene, ethylbenzene, and xylenes (BTEX) and total petroleum hydrocarbons (TPH) as gasoline Ground water samples were collected from monitoring well MW-4 and MW-5 on February 10, ' 1992, and from monitoring well MW-6 on February 11, 1992 Ground water samples were submitted for laboratory analysis of BTEX and TPH as gasoline Ground water level measurements were recorded from monitoring wells MW-1 through MW-6 on February 11, 1992 March 18, 1992 Ground water samples were collected from ground water monitoring wells MW-1 through MW-6 Ground water samples were submitted for laboratory analysis of BTEX and TPH as gasoline Ground water level ' measurements were recorded prior to ground water sampling 2.0 GROUND WATER MONITORING WELL INSTALLATION 2.1 Soil Borings On February 10 and 11, 1992, three soil borings were advanced to a depth of 26 5 feet below grade and completed as 4-inch diameter ground water monitoring wells MW-4, MW-5 and MW-6 (Figure 2). The soil stratigraphy encountered during the course of drilling consisted of sandy lean clay to approximately 9 5 feet below grade in soil borings MW-5 and MW-6 and 17.0 feet below grade in soil boring MW-4, underlain by brown, fine to medium grained, poorly graded sand with silt to a depth of approximately ' 21 feet below grade A gray, poorly graded sand with silt was encountered at the bottom of each boring from approximately 21 to 26 5 feet below grade. Soil boring logs containing soil descriptions are ' included in Appendix B. ' RPT 112 JDM