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3164 Gold Camp Drive <br /> Delta <br /> Suite 200 <br /> Rancho Cordova,CA 95670-6021 <br /> Environmental 916/6. <br /> / Consultants,Ince 9161638-2085 <br /> FAX:9161638-8385 <br /> July 13, 2000 <br /> Mr. Tim Gallagher <br /> City of Stockton <br /> Department of Parks and Recreation <br /> 6 East Lindsay Street <br /> Stockton, California 95202 <br /> Re: Authorization to Install Two Monitoring Wells in Oak Park, Adjacent to Alpine <br /> Street in Stockton, California <br /> Dear Mr. Gallagher: <br /> On behalf of Atlantic Richfield Company (ARCO), Delta Environmental Consultants, <br /> Inc. (Delta) is conducting a subsurface environmental investigation at ARCO facility No. <br /> 2186, located at 3212 North California Street, Stockton, California. As part of the <br /> investigation, San Joaquin County Public Health Services, Environmental Health <br /> Services (PHS/EHS) have requested that ARCO investigate the groundwater quality <br /> north and northeast of site. <br /> This letter is to request authorization for Delta and our subcontractors to drill two soil <br /> borings and convert thein to 2" x 80' groundwater monitoring wells. The locations are <br /> proposed in the lawn area of Oak Park., approximately 20 feet off the north curb line of <br /> Alpine Avenue. The attached figure presents the location of the two proposed monitoring <br /> wells (MW-6 and MW-7) in Oak Park. Additionally, these two wells will serve as <br /> monitoring points between the ARCO facility and the two water wells (West and East <br /> Park Wells)that are reportedly being used to maintain the lawn and grounds of Oak Park. <br /> The soil borings will be drilled using a truck-mounted drill rig advancing 8-inch-diameter <br /> hollow stem augers to a depth of approximately 80 feet below ground surface. A 2" <br /> diameter PVC well will then be constructed within the soil boring. <br /> Delta anticipates the work will be completed in approximately four days. Two <br /> subcontractor personnel will operate the drill rig, and a geologist from Delta will be <br /> present during drilling activities. Every effort will be made to keep the work area clean <br /> and to restore the area to the original condition when the work is completed. We will <br /> contact you to coordinate drilling operations to determine which day of the week is most <br /> convenient. We have been asked by PHS/EHS to complete this work as soon as possible. <br /> Our tentative schedule for installing the monitoring wells is the first week of August. <br /> Providing a Competitive Edge <br /> i <br />