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t { Kennedy/Jenks/Chilton Attachment A to Kennedy/Jenks/Chilton`s letter to Mr. Charles Whitworth _ dated 14 July 1989 Page 5 across the entire length of the screened interval approximately 20 times. After surging was completed, the well was pumped using a diastolic pump and the water was directed into a 55 gallon D.O.T approved drum for the storage and transport of hazardous material . Approximately 40 gallons of water were removed from each well during the developing process. The wells were slow to recharge due to the tight nature of the soil . Pumping was intermittent since a recharge period had to be allowed for each well . _1 After development was completed, each well was purged prior to sampling by removing the equivalent of approximately three additional well volumes of water. Temperature, pH, and conductivity were measured throughout the purging ' process. Copies of the well purge parameter data sheets are presented in Attachment D and are summarized in Table 1 Once the well parameters were ' relatively stable, the well was sampled using a pre-cleaned Teflon bailer. Samples were collected from all of the wells for analysts for nitrates, total petroleum hydrocarbons (TPH), and benzene, xylene, toluene, and ethylbenzene (BXTE) . All development and purge water was collected in certified D.O.T. steel drums approved for the temporary storage and transport of hazardous materials. 1 These drums were labeled with the boring number to indicate where the material 1 originated. The drum was also labeled to indicated drum contents and date of generation of material contained therein i ! Results of the laboratory analyses indicate that groundwater from monitoring well MW-1 contains TPH and BXTE concentrations. However, groundwater from the remaining monitoring wells did not contain concentrations above method detection limits for TPH or BXTE Based on these results it is recommended that the groundwater from MW-1 be sent to a Class I hazardous waste disposal facility. The groundwater from MW-2, MW-3, and MW-4 can be disposed of onsite by emptying the barrels. This procedure should be confirmed with the San Joaquin Local health District. GROUNDWATER SAMPLING CONTAINERS Groundwater samples analyzed for TPH were collected from each well in one, one-liter amber glass bottles fitted with Teflon lined plastic lids. Samples i for groundwater nitrate analysis were also collected in one 1-liter amber glass bottles (which were preactdifted with approximately two drops of H,SO4) fitted with Teflon linedlastic lids Samples fo p p r the BXTE analysts were collected from each well to three 40-m1 amber glass vials fitted with Teflon septums. Two vials from each well were preacidified with two drops of hydrochloric acid (HCL) to reduce the pH below two as currently recommended by the United States Environmental Protection Agency (EPA) for the collection and preservation of VOC samples. In accordance with EPA protocol , the third vial i 1