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June 4, 1991 File No. 1525-69 Page 2 of 3 Property Location and Authorization The property, on which the proposed monitoring well will be installed, is located at the southeast corner of East-Arch and Kingsley Roads in San Joaquin County just south of the city limits of Stockton. The stress address of the property is 3568 East Arch Road and the property is identified;as A.P.N. 181-120-01 in County Assessor's book. The current record owners of the subject property are Obed W. Hill and Mildred 0. Hill. The property owners had signed a letter of agency with BCEI authorizing environmental assessment at their property. Since monitoring well installation is part of the assessment, authorization for entry and well installation is;covered under this,letter�of agency. A_copy_of_the consent ,-- - letter is attached. Well Installation The proposed monitoring well will be drilled and installed by State licensed water well drilling contractor Bay Area Exploration (BAE) of Suisun City. The drilling contractor's license number is C57-522125. Balbi & Chang Associates were given the power of agency by BAE for applying the well permit. A copy of.the letter of agency is also attached. The proposed boring/well will be drilled with 3.75" I.D. hollow stem augers. The well casing will be 2" I.D. PVC schedule 40 slotted and blank pipes. The annular space between the casing and bore hole will be.filled with sand pack, bentonite seal, and cement grout. The well head will be protected by locking cap and water tight vault. Well Maintenance and Abandonment The expected service life for the well is less than one year. ,There is no other scheduled ; testing other than the initial sampling and testing; Also, we do not anticipate any periodic ! maintenance will be required during the service,life of the well. The security of the well will be provided by the property owner, who will regulate the access to his property. At the end of well service life, the well will be abandoned in accordance with State Water Well Standards Part III Sections 20 through 23. Abandonment work will be contracted out by the property owners or their agent at that time.