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02 May 2008 <br /> AGE-NC Project No. 04-1220 <br /> Page 3 of 5 <br /> site, to provide additional regional subsurface data. AGE proposes to advance one CPT sounding <br /> boring on the adjacent property,to the south(1607 Turnpike Road),as part of the on going UST site <br /> assessment at the Comfort Air site. CPT data, past and proposed, collected during the on-going <br /> investigation at Comfort Air will be utilized with onsite proposed CPT data to evaluate potential <br /> ground water sampling intervals. <br /> Following advancement of the CPT sounding boring, approximately ten pilot probe (hydropunch) <br /> borings will be advanced for the collection of grab ground water samples, in the selected ground <br /> water sampling intervals identified by the CPT sounding and the current monitoring well network <br /> screen intervals. Based on the distribution of dissolved hydrocarbons encountered to date in wells <br /> MW-8 through MW-11, AGE proposes: <br /> • Advancement of one CPT soil boring(sounding CPT1)to an approximate depth of 180 feet <br /> bsg, adjacent to well MW-1 in the former UST area. A grab ground water sample will be <br /> collected from an adjacent boring at a depth deeper than 120 feet bsg (well MW-9); the <br /> sampling depth will be determined by the CPT sounding log.If petroleum hydrocarbon odor <br /> is detected in this grab ground water sample, additional water samples will be collected in <br /> adjacent borings from deeper depths determined by the CPT sounding log until no <br /> hydrocarbons odor is detected. <br /> • Advancement of adjacent paired boring B-4 approximately 25 feet southwest of well MW-3, <br /> southwest of the former UST source area, for collection of intermediate and deep discrete <br /> grab ground water samples. 1N° C(4Jy14v k)4 S '� /�r <br /> • Advancement of off-site (Comfort Air) paired boring B-5 approximately 50 feet south of <br /> well MW-5,southeast of the former UST source area,for collection of intermediate and deep <br /> discrete grab ground water samples. /I o 1_ V <br /> • Advancement of paired boring B-6 approximately 60 feet east of well MW-11, east of the <br /> former UST source area,for collection of intermediate and de discrete grab ground water <br /> samples. tj b dW" g\l <br /> • Advancement of paired boring B-7 approximately 10 feet west of well MW-7,north of the <br /> former UST source area,for collection of intermediate and deep ndiscrete grab ground water <br /> samples. <br /> n e AgfA W" �;v <br /> Proposed on-site and off-site CPT sounding and soil boring locations are shown on Figure 2; CPT <br /> advancement and testing procedures are outlined in Section 3.1.Ground water sampling procedures <br /> are outlined in Section 3.2. <br /> Selected ground water samples will be analyzed by a State of California Department of Public Health <br /> (CDPH)-certified laboratory for the following constituents: <br /> Advanced G co E nvi ronmental,Inc. <br />