ARCHIVED REPORTS_XR0004437 - Laserfiche WebLink

Home Browse Search

{., Boyett Petroleum June 29 2001 419 South Main Street, Manteca, California Page 4 ' Final Report of Findings for Lateral . Extent of Groundwater Contamination WHF, Inc., submitted a report of the findings of the CPT penetrations in a letter to Mr. Jeffrey Wong of San Joaquin County, dated February 7, 2001. This letter, along with the CPT logs are included in Appendix D of this report. ' On April 25 2001 p , WHF, Inc., in conjunction with Frontier Dulling, completed a deep ' monitoring well at this site, MW-9. The total depth of this monitoring well was 50.5 feet. The screened interval was from 40.5 feet to 50.5 feet. Sampling was conducted for geology purposes from a depth of 40 feet to 50.5 feet. The location of the CPT ' penetrations and deep well are shown in Figure 3 of this report. The boring log for the deep monitoring well can be found in Appendix A of this report. .3.1 Drilling I The soil boring was accomplished using a mobile mounted drilling rig employing the use of a hollow stem flight auger whose outer diameter was no less than S inches. All drilling equipment was thoroughly cleaned before drilling began, to prevent the introduction of contamination from off site. The boringlogged was gg d under the direct supervision of a registered professional using the Unified Soil Classification System. The color, texture, moisture, plasticity (if applicable), consistency of the earth materials, pertinent soil or bedrock characteristics, and any evidence of contamination was noted. All water- bearing zones and the depths at which they were encountered are noted on this log (Appendix A). Upon termination, the boring into the saturated zone was completed as monitoring well and backfilled with concrete grout, after a Bentonite seal was placed. The monitoring well was of a diameter at least four inches (4") greater than the two ' inch(2") diameter of the well casing to be used. The cuttings from the drilling operation were containerized on-site during drilling for proper disposition. The proper method of disposal are dependent upon results of laboratory analysis. This disposal will be the responsibility of the client unless other arrangements have been made.