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,a HORIZON ENVIRONMENTAL INC. Specialists in Site Assessment Remedial Testing Design and Operation f IS April 30, 2003 0 nEfg- RVEQ Mr Joe Aldridge a U N 0 2 2003 Ultramar Inc 685 West Third Street ENVIRONMENT HEALTH Hanford, California 93230 PERMIT/SERVICES Subject: Well Destruction Report Beacon Station No 3641 1210 East Hammer Lane, Stockton, California Mr Aldridge: At the request of Ultramar Inc (Ultramar), Horizon Environmental Inc (Horizon) has prepared this report documenting the destruction of monitoring well MW-8 at the subject site located in San Joaquin County as shown on Figure 1 The San Joaquin County Environmental Health Department (SJCEHD) recommended that the well be property destroyed before being damaged during the East Hammer Lane road-widening project Horizon obtained a City of Stockton Public Works encroachment permit approved on April 7, 2003 to allow work in the median of East Hammer Lane Horizon also obtained a Well •1 Permit dated April 2, 2003 from the SJCEHD The well destruction activities were developed on the basis of the California Department of Water Resources Bulletins 74-81 (Water Well Standards) and 74-90 (California Well Standards), and SJCEHD requirements The approved permits are contained in Attachment A Well Destruction Mitchell Drilling Environmental Corporation, a C-57 licensed (#804196) drilling contractor, was retained to perform the well destruction activities Monitoring well MW-8 is located as shown on Figure 2 The well was constructed in an 8-inch diameter, 56 5-feet deep boring using 2-inch diameter PVC well casing and screen (35 to 55 feet bsg) Prior to initiating well destruction activities the total depth of the well casing was measured to confirm that there were no obstructions The measured depth of monitoring well MW-8 casing was 54 5 feet Well destruction activities included the following tasks 1 43 sand was placed in the well casing from total depth to 40 feet bsg, 2 pilot rod was lowered into the well casing to the level of the sand, 3 the well boring was drilled out to 60 feet using 8-inch diameter hollow-stem augers, 4 the pilot rod and the well casing were extracted from the hollow stem and the auger bit • was pulled back approximately 3 feet, 5011 Golden Foothill Parkway Suite 7 • EI Dorado Hills CA 95762 • (916) 939-2170 • FAX (916) 939-2172 PO Box 5283 • Bakersfield CA 93388 9 (661) 589-8389 • FAX (661) 589-1456