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09/18/2000 17 08 20946710 AGE STOCKTON • PAGE 02/05 <br /> • 28 August 2000 <br /> AGE-NC Project No 97-0249 <br /> Page 4of10 <br /> The CPT borings shall be advanced to approximately 150 Meet bsg utilizing a 25-ton truck-mounted <br /> CPT dnil ng equipped with 2-inch diameter hollow-stem rods, however, total depths of borings may <br /> vary according to hydrogeologxc conditions encountered during drilling activities <br /> Grab grouted water samples will be collected in intervals of porous and permeable rnatenal Selected <br /> ground water samples will be analyzed by a State of California Department of Health Services <br /> (AHS)-certified laboratory for the following constituents <br /> • EPA Method 8015 Modified/5030 for TPH-d, <br /> • EPA Method 8015 Modified/5030 for TPH-g, <br /> • EPA Method 602 for BTEX, <br /> • EPA Method 8260 modified for tertiary butanol (TBA.), di-isopropyl ether(RIPE), ethyl tert <br /> butyl ether(ETBE) and tert amyl methyl ether (TAME), and MTBE <br /> • EPA Method 8260 modified for methanol, ethanol, 1,2-Dichloroetharxe (1,2-DCA) and <br /> ethylene dxbromide (EDB) <br /> • EPA,Method 7420 for total lead <br /> Laboratory reports for ground water analysis, testing methods, laboratory quality assurance/quality <br /> control(QA/QC) reports, and sample chain of custody documentation will be presented in a report <br /> with findings and recommendations <br /> 3 3 DRILLING AND SOIL SAMPLE COLLECTION <br /> AGE proposes to install six ground water monitoring wells at the site as part of site assessment <br /> activities Proposed well locations are illustrated in Figure 2 <br /> Based on soil and ground water contamination encountered beneath the former UST area, AGE <br /> proposes ground water monitoring wells in the following locations <br /> • Between 150 and 160 feet south of monitoring well MW-1 to assess dissolved petroleum <br /> hydrocarbon concentrations near the southern boundary of the property, <br /> • Between 100 and 110 feet south of momtonng well MW-6 to assess the dissolved petroleum <br /> hydrocarbons near the western boundary of the property, <br /> • Between 95 and 105 feet east of monitoring well MW-3 to assess the extent of dissolved <br /> petroleum hydrocarbons down gradient of the former UST area, <br /> .Advanced GeoEnvlronmental,Inc <br />