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City of Stockton - Van Buskirk Park Golf Course TL 394-0074-01 July 29, 1994 Page 4 Soil samples were collected at five-foot intervals beginning at five feet BSG. Soil samples were collected in stainless steel sleeves, sealed, capped, and preserved on ice for shipment to Twining's California-certified laboratory in Fresno, California. A Twining geologist logged the soils according to the Unified Soil Classification System (USCS) and screened the samples for field evidence of petroleum hydrocarbons. The screening consisted of visual observation for staining or unusual fluids, unusual odors, and head space analysis with a photoionization detector (PID) for the presence of organic vapors. Field screening procedures are described in detail in Appendix A. Two soil samples from each boring were selected for laboratory analysis. Soil cuttings generated during drilling were stored on site in U.S. Department of Transportation (DOT)-approved 55-gallon drums. Appropriate disposal methods can be evaluated based upon the analytical results. Disposal of the drill cuttings is the responsibility of the client. 4.2 Monitoring Well Installation The three soil borings were completed as two-inch diameter groundwater monitoring wells. The monitoring wells were constructed of 2-inch diameter, flush-threaded, schedule 40 polyvinyl chloride (PVC) well casing and 0.01-inch machine-slotted well screen. Based on the depth to groundwater, the screened section extends from approximately 10 to 30 feet BSG. Lonestar #2/12 washed sand was placed from the bottom of the boring to approximately two feet above the top of the machine-slotted casing. Approximately three feet of bentonite pellets were placed on top of the filter pack, and the remaining annular space was filled with neat cement. Each wells was sealed with a locking PVC cap. A traffic rated steel vault was installed flush with the ground surface and secured in place with concrete. Monitoring well construction details are presented in Appendix C. Drilling and well installation activities were supervised by a Twining geologist. The Twining geologist worked under the direct supervision of a California registered geologist. Mr. Steve Sasson of the San Joaquin County Environmental Health Department (S.ICEHD) was on site for soil sampling and grouting activities. 4.3 Monitoring Well Development and Gro-un-dwater Sa—m lin S The monitoring wells were developed by bailing and pumping. Development occurred more than 48 hours after well installation. Development water was retained in sealed DOT- approved 55-gallon drums. Development continued until relatively clear water was discharged. Monitoring well development logs are presented in Appendix D. Groundwater samples were collected following development. Five well casing volumes were purged prior to sampling, and one groundwater sample was collected from each well. Mr. Sasson was on site during groundwater sampling.