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Mr Chuck Carmel <br /> July 21, 1993 <br /> Page 2 <br /> W = Q x C x (120 x 10-5) <br /> where <br /> W = Average amount of chemical discharged, lbs/day <br /> Q = Average flow rate, gpm <br /> C = Concentration, pg/l <br /> 120 x 10-5 = (minutes/day x lbs/gallon)/1,000,000,000** <br /> Thus, <br /> W = 18 x 10-5 x C for Q = 15 gpm <br /> **Use 1,000,000 for determination of average lbs/day of TPH. <br /> BETX values were calculated using the EPA 602 results The biochemical oxygen demand <br /> was calculated using the following conversion. <br /> 0 85 Mg- x 3 7114-x 1 x 10"7 4� x 2 2 lbs x 63,102 jai-x 1 = 000004 thousand lbs <br /> -- - -gal- 4fg -#g- month 1,000 month <br />• <br /> The next monthly status letter will include the interval May 27, 1993, through June 15, 1993 <br /> Please call Mr Steve Misner at (916) 4440123 if you have any questions regarding the <br /> groundwater extraction system at ARCO Station 2133. <br /> Sincerely, <br /> BROWN AND CALDWELL <br /> Seven D. Misner <br /> Project Manager <br /> SDM LEP lk <br /> Enclosure <br /> cc Ms Mary Meays, San Joaquin County ✓ <br /> Ms Elizabeth Thayer, Regional Water Quality Control Board <br /> Mr Frank Tucker, City of Stockton <br /> 10 Ms Mindy Wright, Brown and Caldwell <br /> Use or disclosure of data contained on this sheet is subject to the restriction specrfied at the beginning of this docurnent <br /> Brown and Caldwell 745Zc0RRESP,,7452-04 L-2 <br /> Consultants <br />