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Ground Water Extraction Feasibility Test Re p ort _ I WEST CLAY PROPERTIES 639 West Clay Street, Stockton,'California I1.0. INTRODUCTION At the request of Ms Tina Mayhew of West Clay Properties, Advanced GeoEnvironmental, Inc ' (AGE) has prepared this ground water extraction test report for 639 West Clay Street, Stockton, California The site setting is illustrated on Figure 1 Site structures and monitoring well locations ' are depicted on Figure 2 This report has been prepared in accordance with guidelines established by the California Regional Water Quality Control Board-Central Valley Division for investigation of underground storage tank(UST) sites. ' The objective of the test was to obtain general ground water aquifer characteristics and to evaluate aquifer response to ground water extraction at variable pumping rates 2.0. GROUND WATER EXTRACTION FEASIBILITY TESTS ' -h step draw-down ground water extraction was performed at the site on 19 Jul 2001 to An 8 aur p gr P Y liedetermine the feasibility of ground water extraction as a remediation alternative for the site Ground water extraction well EW-2 was utilized as the extraction well and wells MW-1, MW-3, MW-5, MW-7 and AS-1 were utilized as observation points All of the`MW'-designated wells have 20-foot screen intervals,the `AS'-designated well has a 5-foot screen interval Wells MW-5 and MW-7 and ' were screened in the shallow water zone at between 10 and 35 feet bsg,wells MW-1,MW-2,MW-3 and AS-1 are screened in the deep water zone at between 35 and 60 feet bsg Table 1 summarizes well construction specifications Purged ground water generated during the 8-hour step draw-down test was containerized in an on- site 4,000-gallon poly tank ' 21 8-HOUR STEP DRAW-DOWN PUMPIlVG TEST Prior to initiation o`f the test,-the depth-tb-ground water was measured in extraction well EW-2 and - - ' the observation wells using a Solinst water level meter, during the pumping test,depth to water was measured in the wells at approximately 30-mmute intervals Copies of field logs are included in Appendix A ' I ` The pumping test consisted of extracting ground water from well EW-2 utilizing a 4-inch diameter ' submersible Grundfos Redi-flo pump Pumping began at four gallons per minute(gpm),the pumping rate was increased to five gpm after 140 minutes, and increased to six gpm after 285 minutes The pumping test was prematurely terminated at 465 minutes when an employee inadvertently Advanced GeoEnvtronnnental,for-