Laserfiche WebLink
Rainwater Car Wash • - 2 - 1 August 2012 <br /> 420 W. Yosemite Ave., Manteca <br /> San Joaquin County <br /> In the Model, AAAI presented the results (attached Table 1) of a non-steady state Domenico model <br /> developed by the Los Angeles Regional Water Quality Control Board in May 2001. AA&I's Model <br /> concluded the MTBE travel time is 37 years (2030) to reach the City of Manteca Supply Well 22 <br /> (CMW-22) to first impact at 0.1 ug/L MTBE, 38.4 years (2031) to exceed California Secondary Maximum <br /> Contaminant Levels (MCLS) of 5 ug/L MTBE, and 61.6 years (2055) to reach a peak (maximum) MTBE <br /> concentration of 13.58 ug/L, which exceeds the CA Primary MCL of 13 ug/l. <br /> Comments: <br /> I concur to semi-annual groundwater monitoring for the existing wells. However, the CMT wells MTBE <br /> data may be suspect if groundwater in those wells is flowing between zones allowing cross- <br /> contamination between the water-bearing zones. Please submit a well destruction work plan by <br /> 30 August 2013 for wells MW-7 through MW-13 and a schedule for installation of the previously <br /> approved monitoring wells to adequately delineate the pollutant plume. San Joaquin County <br /> Environmental Health Department must well permit all well destructions and installations. Depth-discrete <br /> well clusters must be constructed to monitor at least the first three water-bearing zones down-gradient of <br /> MW-11. <br /> If you have any questions, I may be reached by phone at (916) 464-4615 or by e-mail at <br /> i Barton ta-�.waterboards.ca.aov. <br /> James L.L. Barton, P.G. <br /> Engineering Geologist <br /> Attachments: Table 1 <br /> cc: Nuel Henderson, San Joaquin County Environmental Health Department, Stockton <br /> Gabriele Baader, Ami Adini &Associates, Inc., 4130 Cahuenga Blvd., Ste. 113, <br /> Los Angeles 91602 <br />