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x S ti i� -�, Site Assessment Report - 139 Caufh Center.Stockton,CA April 5, 1991 Page 9 The monitoring wells were monitored on March 8, 1991,prior to development and sampling. The well survey and monitoring data are presented In Table 2. Appendix E presents the surveyors rlraEes ( th Geodetic Northings and Eastings)and Appendix F presents the well gauging data,which was made prior to, and following,the development of the monitoring wells,on the appropriate record sheat. TABLE 2-WELL SURVEY AND MONITORING DATA MARCH a, 1891 WELL WELLHEAD ELEVATION DEPTH-TO- HYDROSTATIC M. NO. {mean sea level? WATER ELEVATION MW-1 11.17 43.89 -32.72 MW-2 11.76 44.61 -32.85 MW-3 11.78 44.28 ti MW-4X32.50 12.30 44.75 -32.45 _ (Shown In Feet) See Appendix F(monitoring well data)for Informatics oonceming OTW measurements at the time of sampling. Following monhMng_well development,groundwater samples were collected on March 8, 1991, -- from the four monitoring wells(MW 1,MW-2,MW-3 and MW-4). The wells were given time to recover to at least 80 percent of their original static water volume before samp!ing,as indicated by weil monitoring using an Interface probe. This procedure allows for the collection of representative groundwater samples. The development water was collected in 55-gallon steel drums and stored on site pending proper disposal. After the wells had adequately recharged,groundwater samples were Collected with an EPA-approved disposable sampler. Groundwater samples to be analyzed for the presence of BTEX, TPH-as-gasoline,and chlorinated hydrocarbons yd ocarbons(MWS)were placed In 40•miliiliter(mq glass vials, acidified to ensure a pH below 2.0,then sealed with Teflon ra septa caps. These samples we:a Labeled, placed on Ice In an Insulated cooler,and transported under Chain-of-Custody Manifest to the Superior Analytical Laboratory in Martinez,Caldom!a. GROUNDWATER TECH owcy.INc. ,l Ism INNI-MONW-11 NEW-M MEN M,