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• • <br /> Mc areff <br /> _m rt <br /> ENVIRONMENTAL ENGINEERING CORPORATION 31 <br /> May 22, 1998 <br /> Ms. Margaret Lagorio <br /> San Joaquin County Environmental Health <br /> 304 E. Weber Avenue <br /> Stockton, California 95202 <br /> RE: WORKPLAN TO CONDUCT BASE-LINE GROUNDWATER SAMPLING ON BLOCK 34, UNIT 25, <br /> OF THE PROPOSED BROOKSIDE ESTATES RESIDENTIAL DEVELOPMENT(FORMER SARGENT <br /> BARNHART TRACT), STOCKTON, CALIFORNIA <br /> Dear Ms. Lagorio: <br /> This letter presents McLaren/Hart's scope of work for conducting base-line groundwater sampling <br /> on the above-reference site. Block 34 (the Property) is an undeveloped parcel (former farmland) <br /> located within the Brookside Estates residential development currently under construction by various <br /> builders. Brookside Estates is bounded to the north by Fourteenmile Slough, to the east by a former <br /> levee, to the south by the Calaveras River, and to the west by Tenmile Slough (Figure 1). The <br /> Property is located in the northeast corner of Brookside Estates as shown on Figure 2. The purpose <br /> of the groundwater sampling is to provide an assessment of groundwater conditions near the eastern <br /> boundary of the Property. Based on review of historical information obtained during a Phase I <br /> environmental assessment of the Property, a farm equipment maintenance and refueling area may <br /> have been located approximately 500 feet east of the Property. As such, our client has requested <br /> that groundwater samples be collected for defensive purposes to evaluate groundwater conditions <br /> beneath the Property. <br /> SCOPE OF WORK <br /> McLaren/Hart will collect groundwater samples from two proposed soil boring (SB-1 and SB-2) <br /> located along the eastern Property boundary (Figure 2). The groundwater samples will be obtained <br /> using McLaren/Hart's in-house Geoprobe drill rig as follows: <br /> • Advance borings five feet past first groundwater using 1-inch diameter Geoprobe rod. The <br /> lead rod will be attached to a 2-inch diameter Hydropunch groundwater sampler or similar <br /> device. First groundwater is expected to fall between 10 and 15 feet below grade. <br /> • Upon penetrating the upper five feet of the saturated zone, the rod will be retracted 1 to 2 <br /> feet, exposing the Hydropunch screen. A grab groundwater sample will be collected through <br /> the Geoprobe rods from each boring using a stainless steel bailer and placed in containers <br /> 11101 White Rock Road, Rancho Cordova, CA 95670 (916)638-3696 FAX(916)638-2842 <br />