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June 26, 1996 <br /> i' 92-1177102 97 <br /> NORCAL Waste Systems, Inc <br /> Attention Ms Amy Dietz, Environmental Chemist <br /> Subject REPORT - Quarterly Groundwater Monitoring - June 1996 <br /> Stockton Scavenger Association Facility <br /> 1240 Navy Drive <br /> Stockton, California <br /> Page 2 <br /> Water Level Measurements <br /> On April 4, 1996 MARK staff recorded water levels from Monitoring Wells MW-1, MW-3, <br /> and MW-4 Static water levels were measured using an electronic sounder-tape within a one <br /> hour period prior to purging the wells The data was used to interpolate the potentiometric <br /> groundwater surface at the site which is presented in Drawing 3 Water level measurements for <br /> the current and previous monitoring rounds are summarized in Table 1 Field water level <br /> measurements are included in Appendix A of this letter <br /> Groundwater Sampling <br /> After water level measurements were recorded, the four monitoring wells were purged and <br /> sampled according to state and county guidelines A minimum of three well casing volumes of <br /> groundwater was purged from each well Three wells (MW-1, MW-3, and MW-4) were purged <br /> using an air diaphragm pump Monitoring Well MW-2 was purged using a dedicated bladder <br /> pump Field water quality parameters (pH, temperature, and specific conductance) were <br /> measured for each casing volume of water removed from the well One additional casing volume <br /> of groundwater was purged after sampling Groundwater samples were collected using Teflon <br /> bailers at Wells MW-1, MW-3, and MW-4 The sample from Monitoring Well MW-2 was <br /> collected from the dedicated bladder pump spicket Purged groundwater was treated by the on- <br /> site groundwater treatment system and discharger) into the sewer system Copses of the <br /> purging/sampling forms are included in Appendix B <br /> Laboratory Analysis <br /> The groundwater samples were submitted under Chain-of-Custody protocol to <br /> McCampbell Analytical, Inc (McCampbell), of Pacheco, California McCampbell is certified <br /> by the State of California to perform the required analyses <br /> The groundwater samples were analyzed for the following constituents <br /> ■ TPH-d by Environmental Protection Agency (EPA) Method 8015M, <br /> ■ TPH-g by EPA Method 8015M, and <br /> ■ BTEX by EPA Method 8020 <br />