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rC <br /> f <br /> (DEPS cert. #1211 ) utilizing EPA methods 802.0 and 8015, <br /> respectively. Analytical results are summarized on Table 1. <br /> Laboratory data sheets and chain-of-custody documentation are <br /> included in Appendix 1, <br /> To avoid cross--contamination, drilling augers were steam- <br /> cleaned before drilling each borehole. Water used to clean <br /> the augers was stored in drums approved for hazardous liquid <br /> storage and remains on-site. <br /> All soils generated during drilling activities will be aerated <br /> along with excavated soils, as previously described. <br /> 3.3 Monitoring Well Construction <br /> Monitoring wells MW1, MW2, and MW3 were constructed of two- <br /> inch diameter F480 PVC well screen and casing. A neat cement <br /> mixture was used to seal the wells, in accordance with State <br /> of California Water Well Standards (Dec. 1981, p. 34, para. <br /> 4) . Well construction details are shown on well/boring logs <br /> (Appendix III). <br /> Subsequent to installation, the wellheads were surveyed to <br /> Mean Sea Level Datum by a qualified surveyor (Table 3). After <br /> the wells were allowed to stabilize for at least 24 hours, <br /> they were monitored for free product in accordance with <br /> WaterWork's Groundwater Monitoring Protocol (Appendix IV) . <br /> Water samples were then collected after purging a minimum of <br /> four well volumes (casing and sandpack). Samples were <br /> analyzed by Applied Analytical for BTEX and TPFiG utilizing EPA <br /> methods 8020 and 8015, respectively. Analytical results are <br /> r summarized in Table 2. Laboratory data sheets are included in <br /> Appendix I. Field purge logs are included in Appendix V. <br /> All site activities involving potential contact with hazardous <br /> materials (i.e. gasoline or solvent contaminated soils) were <br /> conducted in accordance with WaterWork's Health and Safety <br /> Plan (on file with SJCEHD). <br /> 3.4 Subsurface Conditions <br /> Soils encountered beneath the site consist primarily of lean <br /> to fat clays with apparently discontinuous layers of silt and <br /> sand. The maximum depth explored was approximately 31 feet <br /> below grade. Site stratigraphy is shown on Figure 5. <br /> e <br /> 4 <br /> LCR0510.wp <br />