SITE INFORMATION AND CORRESPONDENCE

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Groundwater Investigation Work Plan Country Club Storm Drain System Project Country Club Blvd.and Plymouth Road,Stockton,CA Page 2 push boring locations are shown on Figure 2, Appendix A. The boring locations were chosen based on potential sources of contamination. The direct push borings will be hydraulically advanced using a 2-inch diameter conical bit. Upon completion of the boring and sampling, the borings will be grouted with neat cement. The cement will be trended into the borehole to avoid bridging. The groundwater sampler utilizes a sealed, water-tight, stainless steel sample chamber and PVC screen which is isolated from the surrounding environment as the sampler is advanced. When the desired depth for collection of a groundwater sample is reached, the sample chamber is opened by pulling back on the body of the sampler and exposing the screen. When the screen is full, a stainless steel bailer is lowered through the rods to collect the groundwater sample. The groundwater will be gently emptied. from the bailer into the appropriate laboratory supplied containers. The sample containers will be sealed, labeled, placed in a cooler chilled with ice, and delivered under chain-of-custody procedures to a California certified laboratory for analyses. The bit and associated push rods, the groundwater sampler, and the stainless steel bailer will be thoroughly cleaned before each boring is advanced using laboratory-grade, non-phosphate detergent and de-ionized water and double rinsed with de-ionized water. Laboratory Analyses The groundwater samples will be analyzed for BTEX and selected gasoline oxygenates/additives [TBA, MTBE, di-isopropyl ether (RIPE), ethyl tertiary-butyl ether (ETBE), TAME, and 1,2-dichloroethane (1,2- DCA)] by EPA Method 8260B. Condor will analyze the gas chromatographs produced and provided by the lab for patterns fingerprinting the possible source of contamination. REPORTING Condor will prepare a report detailing the findings of the investigation. The report will include a discussion of the field and laboratory procedures used to conduct the investigation, a discussion and presentation of the analytical results, and recommendations. Upon approval of this work plan by MUD and SJCEHD and notification by MUD to proceed, the field portion of the investigation can be completed within approximately two weeks. The turn-around time for laboratory analyses is approximately two weeks. A report can be submitted within two weeks of receipt of the laboratory analytical results. If you need additional information or have any questions,please call David Wood at(209) 234-0518. Respectfully submitted, �\S. EREO OFo� 00 CO OR THTC OLOGIES, INC. OD Vti r � Marikka Hughes David K. od No. 6532 Staff Geologist California a 'stered Geolo 'st 6532 Attachments: Figure 1—Vicinity Map 4TP OF Figure 2—Proposed Boring Locations cc: Mike Infuma, SJCEHD P:\4176P Country Club\4176A Hydropunch\Work Plans\GW1nvest_WP_9-10-03.doc lkk� o, CONDOR