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r j <br /> $0 <br /> r6 <br /> ENVIRONMENTAL MANAGEMENT C-ORP. rY- <br /> Please Refer To:- I <br /> AEMC Job No.-802�U' <br /> 1 November 1988 <br /> Ms. Laurie A. Cotulla, R.S. <br /> San Joaquin Local Health District, <br /> 1501 East Hazelton Avenue , <br /> Stockton, California 95201 <br /> RE: WORKPLAN FOR PIEZOMETER INSTALLATION - GOLDBOND, <br /> BUILDING PRODUCTS, STOCKTON, CALIFORNIA <br /> Dear Ms. Cotulla: <br /> On behalf of Gold Bond Building Products, American Environmental Management <br /> Corporation (AEMC) is pleased to submit to the San Joaquin Local Health District <br /> (SJLHD) the following permit application, fees and workplan for installing three (3) <br /> piezometers at the Gold Bond Building Products facility, 800 West Church Street, <br /> Stockton, California. Proposed piezometer locations are shown on the attached figure. <br /> The installed piezometers will be utilized to determine the prevailing direction of shallow <br /> ground-water flow in the vicinity of a 5,300 barrel capacity fuel storage tank located in the <br /> southeast corner of the site. The information generated will provide the rationale for <br /> siting permanent ground-water quality monitoring wells around the tank, and support the <br /> preparation of a ground-water quality monitoring plan for the tank.. <br /> Well borehole drilling and sampling operations will be conducted by Spectrum <br /> Exploration, Inc., Stockton, California. California-Licensed Contractor Questionnaires for <br /> both AEMC and Spectrum Exploration Drilling, Inc. are attached. Once the well permit <br /> has been approved, a representative from Spectrum Exploration Inc.will sign the <br /> application at the SJL.HD's offices. Hollow-stem auger drilling.and well construction <br /> methods will be used to complete each piezometer. Each piezometer borehole will be <br /> drilled to an approximate depth of 21 feet below ground surface to accommodate a 5 foot <br /> well screen. The entire length of the borehole will be continuously logged, for the purpose <br /> of describing the vertical variations in the soil profile encountered. The collected soil <br /> samples will also be examined for visible stairung. All soil cuttings generated by the <br /> borehole drilling and sampling operations will be contained and stored onsite. <br /> Materials to be used for construction of the piezometers will include 2-inch I.D. . <br /> interior/exterior flush threaded PVC Schedule 40 casing and well screen. Well screen <br /> perforations will be precision machine slotted. Screen slot sizes will be 0.20 inch. <br /> Screen/casing strings will be threaded together. Filter pack material will be clean, <br /> rounded,mater-worn silica material, and will be installed, by a tremie pipe, into the. :. <br /> annular space adjacent to the well screen section. Within the annular space above the top <br /> of the filter pack material, a 2-foot thick bentonite seal will be placed as a seal using <br /> 97 IQ Lincoln Village Drive,Suite 501.Sacramento,CA 95827 1(916)364-9872 <br /> r <br />