DELHI CENTER - DELHI PARK CONSTRUCTION AND FUNDING AGMT-2000

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08/07/2000 11:35 FAX [a 02 kin Attention: Subject_ February 23, 2000 City of Santa Ana Public Works Agency 101 West 0 Street Santa Ana, California 92701 Ms. Souri Amirani Project No. 993000 -047 Destruction of Thirteen Groundwater Monitoring Wells and Soil Disposal Summary, Old City Yard, 730 Warner Avenue, Santa Ana, California In accordance with your written authorization to proceed dated June 9, 1999, Leighton and Associates, Inc. (Leighton) has properly destroyed thirteen groundwater monitoring wells at the Old City Yard located at 730 Warner Avenue, Santa Ana, California. Destruction activities were performed in accordance with state and local regulatory guidelines. Approximately 5 cubic yards of petroleum hydrocarbons impacted soil and one 55- gallon drum of rinsate water were generated from the well destruction activities. The soil and water were transported offsite and disposed in accordance with all local and state regulatory guidelines. Field activities and laboratory analyses are summarized below.c Field Activities On December 29, 1999, Leighton supervised the destruction of thirteen groundwater monitoring wells (MW -I through MW -8, B -2 through B -5, and LA -1). Leighton subcontracted Cascade Drilling, Inc. of Norwalk, California to destroy the monitoring wells (Figure 2). Monitoring wells were destroyed according to guideline set forth by the Orange County Health Care Agency (OCHCA), A copy of the well destruction permit is included in Appendix A. Monitoring wells were constructed of 4 -inch diameter PVC pipe and ranged in total depth from 15 to 58 feet, Table I shows monitoring well information including associated total depths, Monitoring wells were destroyed by overdrilling the entire well; removing the well casing, filter pack, annular seal, and well box. Boreholes were backfilled with hydrated bentonite slurry. A total of 318 feet of monitoring well materials were drilled. Approximately five cubic yards of soil cuttings from the boreholes were stockpiled on plastic onsite. W.A. Woods Industries of South Gate, California, transported the soil off site on February 2, 2000. The soil was transported under nonhazardous waste manifest to TPS Technologies Inc., Adelanto, California for final disposal_ A copy of the nonhazardous waste manifest is included in Appendix 8. One 55- gallon drum of rinsate water was generated from drilling activities. On February 18, 2000, Belshire Environmental transported the drum under non - hazardous waste manifest to their staging yard located in La Habra, California. The drum will later be purged by a vacuum truck and transported Compton for final disposal. Leighton will forward a copy of the non - hazardous waste manifest under separate cover.