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/9� <br /> [3EOMATRIX <br /> A free product sample was collected from MW-2 in August 2004 The laboratory characterized <br /> ' the sample as a substantially degraded middle distillate such as diesel #2 or heating oil that <br /> lacked the common water soluble, aromatic components such as BTEX, and is thus considered <br /> relatively insoluble in water Based on the chemistry of the petroleum sample collected at the <br /> site, the detected TPHd in the groundwater samples from shallow wells MW-2, MW-3, and <br /> MW-4, which are screened within the zone of apparent petroleum hydrocarbon affected soil, is <br /> ' likely due to small globules of petroleum collected within the water sample and/or petroleum <br /> entrained on soil and not dissolved phase petroleum hydrocarbons <br /> 3.0 MONITORING ACTIVITIES - FIELD AND ANALYTICAL METHODS <br /> ' This section describes the methods used to collect water levels, collect groundwater samples, <br /> and analyze the samples Groundwater monitoring field activities were performed by Blaine <br /> Tech Services, Inc (Blaine) on behalf of Conti Monitoring wells MW-I and MW-3 through <br /> MW-7 (Figure 2) were sampled on February 25, 2005 by Blaine Well MW-2 was inaccessible <br /> on February 25, 2005, and was sampled on March 15, 2005 <br /> 3.1 FIELD METHODS <br /> Prior to sampling each monitoring well, the water level was measured with an electrical <br /> sounder, the depth to water below the top of the well casings were recorded, and at least three <br /> ' casing volumes were purged from each well using a new, clean, disposable bailer Water <br /> quality parameters were monitored for dissolved oxygen, pH, specific conductance, and tem- <br /> perature during purging Well sampling records are included in Appendix A <br /> Wells also were observed for the potential presence of free product No measurable free <br /> ' product was observed in any of the monitoring wells A sheen was observed in MW-2 on <br /> January 24, 2005 during an inspection of the "petro trap" installed in MW-2 <br /> ' Groundwater samples were collected from each well using a new, clean, disposable bailer, <br /> groundwater was transferred from the bailer using a bottom-emptying device into three 40 <br /> ' milliliter volatile organic analysis vials (VOAs) containing hydrochloric acid as a preservative <br /> for total petroleum hydrocarbons quantified as gasoline (TPHg) In addition, samples also were <br /> ' coIlected in 1-liter glass amber bottles for total petroleum hydrocarbons quantified as diesel <br /> (TPHd) analyses <br /> ' After samples were collected, labeled, and sealed in a plastic bag, they were stored in an ice- <br /> cooled chest Groundwater samples collected in February and March 2005 were delivered <br /> ' under chain-of-custody procedures to Zymax Laboratories, Inc (Zymax), of San Luis Obispo, <br /> ' I 1Da_Safe19000s\9963 00]1lst qtr 200512 Txtltxt doc 3 <br />