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0 00 <br />Water Boards <br />Jr, <br />FilM1,10 <br /> <br />Central Valley Regional Water Quality Control Board <br />11 June 2012 <br />Gurpal Sidhu et al <br /> Karamject Johal Gurpal Sidhu et al <br />5410 Staples Way 10228 Hall Avenue 1233 N. Central Avenue <br />Linden, CA 95236 <br /> Richmond, British Columbia V6X-3T9 Kent, WA 98032 <br />Paul Sidhu Parmdip Johal Deputy Dhaliwal <br />3032 E. Waterloo Avenue 7391 Nevis Drive 15420 SE 80th Street <br />Stockton, CA 95205 Richmond, British Columbia V7A-1J5 Newcastle, WA 98059 <br />DOCUMENT REVIEW, WATERLOO FOOD AND FUEL, 3032 E. WATERLOO ROAD, STOCKTON, <br />SAN JOAQUIN COUNTY (RB CASE# 390609) <br />I reviewed the Interim Remediation Work Plan Addendum (Workplan Addendum) received <br />1 June 2012 from Advanced GeoEnvironmental Inc. (AGE), the consultant for Deputy Dhaliwal. The <br />Workplan Addendum proposed installation of one additional onsite 4" diameter groundwater <br />extraction well (EW-9) screened from 80' to 100' below ground surface (bgs), and located in the <br />southwest corner of the site near EW-5 (screened 45' to 65' bgs) and multilevel (A through E zones) <br />monitoring well MW-5. New well EW-9 will increase the efficiency of the current groundwater pump <br />and treatment (GWPT) system by 2 gallons per minute in the 80' to 100' bgs zone, and reduce <br />groundwater concentrations of the groundwater plume migrating towards offsite MW-11 (100' <br />downgradient of <br />EW-9). <br />First quarter 2012 groundwater monitoring concentrations are given in micrograms per Liter (ug/L) in <br />the table below. <br />Well Screen Interval TPHg Benzene MTBE TBA <br />MW-5A 45' to 65' bgs 800 <0.5 430 2,100 <br />MW-5B 87' to 100' bgs 3,000 520 94 220 <br />MW-11 90' to 100' bgs 900 <0.5 830 <10 <br />TPHg = total petroleum hydrocarbons as gasoline MTBE = methyl tert butyl ether TBA = tertiary butyl alcohol <br />The Workplan Addendum also proposed the installation an air injection bubbler into an existing <br />250-gallon sediment holding tank, prior to the current six 1,000 lb. granulated activated carbon (GAC) <br />units, "...to ensure treatment of MTBE in extracted groundwater'. According to an email received <br />8 June 2012 from AGE, TBA concentrations in groundwater are rising onsite and the additional <br />pre-treatment for the GWPT system will extend the life of the GAC. Influent treatment system <br />concentrations in May 2012 were TPHg, 20,000 u9/L; benzene, 1,600 ug/L, TBA, 710 ug/L, and <br />MTBE, 220 ug/L. The TPH mass removal from March 2012 to May 2012 was 52 lbs. <br />KARL E LONGLEY SCD. P.E., I PAMELA C. CRELDON P1.. DCEE, E.<Et-Amy: ornr,cr, <br />11370 sw-, Center Drive 5200. Rancho Cordova, CA 95670 www waterboarCIS Ca OevicentralvalIey <br />•