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23 <br /> Table 6-1. Site wells not meeting General Basin Plan Water Quality Objectives. <br /> Parameter Basin Plan Site Wells Exceeding <br /> Objective Basin Plan Objectives <br /> A! <br /> Chloride r �Np1t'�" 250,000 ug/L NP-1 <br /> Iron % 300 ug/L MW-2 ,MWA MW <br /> Nitrate 1 f i #c t tl 45,000 ug/L MW-6t% MW-9t' <br /> Specific Conduct ance11 900 umho/cm MW-2i,MW-10', NP-1' <br /> ' Sulfate v 250,000 ug/L <br /> Total Dissolved Solids 500,000 ug/L MW 1'"t, MW-2 , MW-3 <br /> MW-5"", MW-6'"t, MW-7'', MW-8"t, <br /> MW-9"t, MW-10',NP-I` <br /> ' Notes : wells not meeting Basin Plan Objectives at monitoring event conducted Feb 4, 1999 <br /> 'wells not meeting Basin Plan Objectives at monitoring event conducted Tune, 1998 <br /> ' t wells upgradient or cross-gradient of the plume center <br /> Chloride has been only been measured in three Site wells Those measurements were <br /> made during the most recent groundwater monitoring event on wells MW-2, MW 10, and NP- <br /> I The chlonde concentration in well NP-1 (470,000 ug/L) exceeds the MCL and Basin Plan <br /> Objective by a factor of nearly two <br /> ' Well - <br /> MW 2(screened across the water table), well MW-10 (screened from 50 to 60 ft <br /> ' bgs), and well NP-1 (screened from 85-90 ft bgs) are all located within approximately 25 feet <br /> of each other and have been examined for comparison of general water quality with depth <br /> ' Table 5 of Appendix E summarize the general chemistry laboratory analytic results for the <br /> February 4, 1999 monitoring event Analytic results for bicarbonate alkalinity, chloride, pH, <br /> ' potassium, and sulfate are generally similar between wells MW-2 and well MW-10 However, <br /> for all of these parameters,the results are clearly different for well NP-1 than they are for wells <br /> ' MW-2 and MW-10 For example, chloride concentration in NP-1 is greater than MW-2 and <br /> MW-10 by factors of 3 7 and 2 6, respectively Sulfate concentration in NP-1 is greater than <br /> ' MW-2 and MW-10 by factors of 9 1 and 5 3, respectively TDS concentration in NP-1 is <br /> greater than MW-2 and MW-10 by factors of 15 and 19, respectively Bicarbonate alkalinity <br />