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CONDOR EARTH TECHNOLOGIES INC 21663 Brian Lane Sonora CA 95370 Phone 209.532.0361 FAX 209.532.0773 CONDOR www.condorearth.com Project No. 5577 August 4, 2009 Gayleen Perreira, P.E. Water Resource Control Engineer Permit Section,NPDES Unit Central Valley Regional Water Quality Control Board 11020 Sun Center Drive,No. 200 Rancho Cordova, CA 95670 Subject: Monitoring Well Destruction Work Plan, City of Stockton Regional Wastewater Control Facility,2500 Navy Drive, Stockton, California Dear Ms. Perreira: Condor Earth Technologies, Ina (Condor) has prepared this Work Plan for the destruction of monitoring well MW4 at the City of Stockton Regional Wastewater Control Facility located at 2500 Navy Drive in Stockton, California. The well was removed from the monitoring network required under California Regional Water Quality Control Board Order No. R5-208-0154, and is no longer needed On behalf of the City of Stockton MUD, Condor requests approval of this Work Plan for the proper destruction of MW4. The well was installed by PC Exploration, Inc. (C57 #885630) of Lincoln, California. The well was installed to a total depth of 15 feet below ground surface (bgs) with 10 feet of 0.010-inch slotted screen. Monitoring well MW4 is located between the recirculation canal, containing effluent, and the groundwater interceptor ditch, which captures groundwater and pumps it back to the treatment facility. MW4 is prone to surface water infiltration and/or stormwater infiltration due to a shallow and thin surface seal. Consequently, the groundwater samples collected from MW4 are not representative of actual groundwater conditions. Monitoring Well Destruction The boring for monitoring well MW4 was drilled using continuous-flight hollow-stem auger. The well was constructed with 4-inch schedule 40 PVC piping to a depth of approximately 15-feet bgs. MW4 was screened with 0.010 machine-slotted PVC from approximately 4.5 to 14.5-feet bgs. Condor will submit a well destruction permit application to the San Joaquin County Environmental Health Department (SJCEHD) and will receive the permit prior to initiating fieldwork. A health and safety plan will be reviewed by all on-site personnel prior to initiating fieldwork. The site will be marked for Underground Service Alert (USA) at least 72 hours prior to fieldwork commencement. The project site boundaries will be physically marked so that USA representatives will he able to clear the proposed boring locations for public utilities.