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t <br /> ..: <br /> 3330 Data Drive <br /> Delta Suite 100 <br /> ��. Rancho Cordova,CA 95670 <br /> Environmental <br /> 916/638-2085 <br /> Consultants,Inc. FAX:916/638-8385 <br /> July 2, 1992 <br /> Mr. Harlin Knoll <br /> Public Health. Services <br /> Environmental Health Division <br /> County of San Joaquin <br /> 1601 Hazelton Avenue <br /> Stockton, California 95201 <br /> Subject: Work Plan for Well Abandonment <br /> Beacon Station No. 696 <br /> 2448 West Kettieman Lane, Lodi, California <br /> Delta Project No. 40-90-839 <br /> Dear Mr. Knoll: <br /> Delta Environmental Consultants, Inc. (Delta), is conducting a hydrogeologic investigation for <br /> Ultramar Inc. (Ultramar) at 2448 West Kettleman Lane, Lodi, San Joaquin County, California <br /> (Figure 1). The investigation is intended to evaluate the extent of petroleum hydrocarbons in soil and <br /> ground water beneath the site. <br /> Delta has been requested by Ultramar to properly abandon three ground water monitoring wells at <br /> the site. The wells do not contain water and are likely to be damaged by road construction activities <br /> currently in progress adjacent to the site. The locatio s of the three wells are shown in Figure 2, and <br /> include monitoring wells MW-9, MW-11, and MW-12. Monitoring well MW-9 is 40 feet deep and <br /> is screened from 30 to 40 feet below the ground surfa e. Monitoring wells MW-11 and MW-12 are <br /> 50 feet deep and are screened from 35 to 50 feet telow the ground surface. Each of the three <br /> monitoring wells is constructed of 2-inch diameter Schedule 40 PVC well casing. <br /> The wells will be abandoned by pressure grouting. This method will involve backfilling the well <br /> casing with neat cement supplemented with approximately 5% bentonite. The well casing will then <br /> be pressurized to approximately 10-15 psi to drive the grout through the well screen and into the void <br /> spaces of the filter pack. Each well will be grouted to within 2 feet of the ground surface. <br /> Enclosed you will find two well abandonment permits and two checks for $60 dollars. We anticipate <br /> performing the work as soon as possible after approval is obtained from your office. <br /> Delta Delivers Solutions <br />