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CLEARWATER <br /> G R O U P I N C <br /> results is presented on Table 1 Hydrocarbon concentrations are presented <br /> ' graphically on Figure 4. A copy of the laboratory reports and chain-of-custody forms <br /> are attached in Appendix B <br /> ' Based on the results of four quarters of groundwater monitoring conducted since <br /> MW-4 and MW-5 were installed, it is apparent that the downgradient extent of <br /> hydrocarbon contamination (northwest of MW-5) has not been defined <br /> Hydrocarbon concentrations in groundwater samples from MW-3 and MW-4 <br /> (located upgradient and crossgradient, respectively) have been nondetectable during <br /> ' most sampling events <br /> ' 5.0 RECOMMENDATIONS <br /> Previous investigations indicate the presence of hydrocarbons in both vadose zone <br /> and saturated soil at the subject location In addition, results of groundwater <br /> monitoring indicate that groundwater downgradient of the site contains <br /> hydrocarbons <br /> On July 7, 1995, Clearwater submitted a Revised Workplan proposing installation of <br /> one downgradient groundwater monitoring well, two air sparging wells and two <br /> vapor extraction wells at the site. The workplan will be implemented during the <br /> d urd quarter of 1995, pending PHS/EHD approval <br /> r <br /> r r , <br /> r r ; <br /> I <br /> r <br /> a r <br /> I I I I <br /> r I <br /> I , ' li <br /> l r l ID-1101 2Q95 3 August 3,1995 <br /> �4" <br /> i I , , IE � (♦ l ir,�� i H �Ir� Ilil i(� i t k � i, � I I <br />