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GEOTECHNICAL <br /> ENGEO ENVIRONMENTAL <br /> WATER RESOURCES <br /> Expect Excellence CONSTRUCTION SERVICES <br /> Project No. <br /> 6282.002.000 <br /> May 31, 2018 <br /> Mr. Jefferson Hill <br /> CHI Development Group LLC <br /> 527 W. 711 Street, Suite 308 <br /> Los Angeles, CA 90014 <br /> Subject: South Lathrop Commerce Center(SLCC) <br /> Monitoring Wells MW-S1 through MW-S5 <br /> Lathrop, California <br /> WORK PLAN FOR WELL ABANDONMENT <br /> Dear Mr. Hill: <br /> As requested, ENGEO has prepared this work plan for monitoring well abandonment at the subject <br /> site, located within the South Lathrop Commerce Center(SLCC)development in Lathrop, California. <br /> PROJECT DESCRIPTION <br /> The subject wells are located south of Madruga Road in Lathrop on the parcels identified as <br /> APN 241-02-070 for MW-S1 and APN 241-03-013 for MW-S2 through MW-S5. <br /> The wells to be abandoned are identified as MW-S1, MW-S2, MW-S3, MW-S4 and MW-S5. The <br /> wells were installed by ENGEO in 2004 to monitor groundwater levels and water quality at the site. <br /> The wells are approximately 20 feet deep and consist of 2-inch PVC well screen and casing <br /> protected by stainless steel stand pipes set in concrete. The wells are screened approximately <br /> from 10 to 20 feet below the ground surface (bgs). It is our understanding that the wells are in an <br /> area planned for new construction. The subject wells are to be destroyed and abandoned in <br /> accordance with San Joaquin County Environmental Health Department requirements. <br /> San Joaquin County records indicate that groundwater in the immediate vicinity of the site has no <br /> known contamination. <br /> SCOPE OF SERVICES <br /> The well destruction will include completely overdrilling the well to remove existing well materials <br /> and tremie backfilling the hole with neat cement, under the observation of a San Joaquin County <br /> Environmental Health representative. <br /> We will coordinate with a licensed drilling contractor to overdrill the well to a depth of <br /> approximately 20 feet bgs, or the bottom of the previous borings, whichever is deeper. Drilling will <br /> be accomplished using a truck-mounted hollow stem auger drill rig equipped with 8-inch-diameter <br /> augers in order to remove the annular seal around the well. Given that the subsurface material is <br /> not suspected to be contaminated, drilling cuttings will be discharged on the ground surface near <br /> the well. <br /> 17278 Golden Valley Parkway • Lathrop, CA 95330• (209)835-0610 • Fax(888)279-2698 <br /> www.engeo.com <br />