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I <br /> rQUARTERLY GROUND WATER MONITORING REPORT <br /> 6131 Pacific Avenue Stockton California <br /> Page 3 <br /> r � <br /> r2.2 Ground Water Analysis <br /> Ground water samples were collected from the three on site ground <br /> water monitoring wells on 23 July 1990, 9 October 1990 and 10 <br /> r January 1991. Ground water samples were collected according to the <br /> Standard Operating Procedures described in Appendix A. The samples <br /> were analyzed for; a) petroleum hydrocarbons volatile (PHV) as <br />' gasoline by a gas chromatograph flame ionization detector (GC FID) <br /> EPA method 5030, b) benzene, toluene, ethyl benzene, and total <br /> xylenes (BTEX) by EPA method 602, c) total lead constituent by EPA <br />' method 7421, and, d) total and fecal coliform. The total lead <br /> testing was not performed for the 10 January 1991 sampling. Table <br /> 2 summarizes the ground water analytical results. Copies of the <br /> certified analytical results and chain-of-custody records are <br />' included in Appendix B. <br /> TABLE 2 <br /> GROUND WATER ANALYTICAL RESULTS <br /> a. ) Petroleum Constituents <br />' Ethyl Total PHV <br /> Well Sample Benzene benzene Toluene Xylenes Gasoline <br /> No. Date ug/L (ppb) ug/L (ppb) ug/L(ppb) ug/L (ppb) ug/L (ppb) <br /> MW-1 7/23/90 1.9 0.6 1.5 2 . 0 350 <br /> 10/09/90 0.8 BDL BDL BDL BDL <br />' 1/10/90 0.9 BDL BDL BDL 70 <br /> MW-2 7/23/90 44 7 . 1 42 21 1,900 <br />' 10/09/90 78 BDL 43 27 570 <br /> 1/10/90 360 BDL 75 53 1,200 <br /> MW-3 7/23/90 10, 000 1, 800 18, 000 11, 000 63 , 000 <br /> 10/09/90 7 ; 900 1. 200 12 . 000 9 , 000 69, 000 <br /> * 1/10/90 10, 000 1, 200 17,000 7, 200 63 , 000 <br /> 90-020A RPT <br />' 90-020 QMR <br /> 1 <br />