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ENVIRONMFNTAL HEALTH DIVISION <br /> 304 E. Web �*ve. Third f=loor <br /> Wright PO. <br /> O. Box 38E, tock on CA 95201-0388 <br /> EnvironmenApproved P� <br /> Hied ❑ <br /> Services, lniv; onditions 0 <br /> Construction • Engineering • R08W 7,17_c by <br /> March <br /> 2 <br /> March 15, 1999 �4kmoljk_ FaC e-�.pEDiTiZ <br /> �"»1.6�►P�� �N CJ.u1�E5 CONC�T�A't- <br /> �CLG`� <br /> Mr. Ron Rowe Q,w Qct * 4W5/Ot� DU t 1'a <br /> San Joaquin County PHS/EHD thyk;&JAq c-o uSL cRtiY,1 7i dytcM <br /> 304 East Weber Street, Third Floor J_ �.-r Su gm Lt c STAL <br /> Stockton, CA 95202 ZIP <br /> 5l` PIZZ-N0e61fWc F UOT <br /> Re: Comment Resolution—Work Plan, Excavation and Soil Management 50 ?�''` `D a`� <br /> Nelson Ready-Mix Site, 22700 State Highway 99, Ripon, California <br /> t1.CQ131 tJ�,�� <br /> QorE_P-nPR. <br /> Dear Mr, Rowe: Q el^e,aP--Ir <br /> ;>P06 `.A'"F- <br /> It was a pleasure to speak with you on Friday, March 12, 1999 regarding your conditional <br /> approval of the above-referenced work plan. Thank you for your thorough review and ,4 ,,,yzi" <br /> constructive comments. This correspondence addresses the following seven comments <br /> outlined in your fax correspondence of March 10, 1999. <br /> 1. In order to expedite the public participations notification process, a one-page summary of <br /> al hazards associated with the proposed work is attached. <br /> the goals, processes and potenti <br /> 2. After consulting with a shoring contractor and a visit to the site with the contractor, <br /> Wright Environmental recommends that the excavation be shored on all four sides using <br /> slide-rail E&S linear shoring. To facilitate the installation of this shoring system and to <br /> reduce cost, the width of the excavation will be reduced .from 25 feet to 20 feet. This <br /> reduction in excavation area will not significantly sacrifice the remedial efforts. <br /> Incorporating excavation objectives and site and subsurface logistical conditions, the <br /> shoring system and excavation will be designed and certified by a state of California <br /> registered civil engineer. <br /> 3. Groundwater pumped from the excavation will be stored in a rented water storage tank <br /> for temporary storage on site. All of the pumped water will be discharged into the first <br /> water storage tank for sediment collection and control. Additional water tanks will be <br /> used, if needed. Once the de-watering is complete, any separate-phase diesel will be <br /> removed with floating absorbant pads. The remaining liquid will.be sampled and <br /> E analyzed for Total Petroleum Hydrocarbons (TPH)-as-diesel, TPH-as-gasoline,.benzene, <br /> ethylbenzene, toluene, and xylenes(BTEX). Based on the results of the analytical <br /> i testing, a carbon filtration system will be designed to treat the water prior to sewer <br /> I discharge. To confirm that the discharge has been effectively treated, eluent water <br /> samples will also be collected for analysis. Effluent water samples will also be analyzed <br /> for TPH-as-diesel, TPH-as-gasoline and BTEX. <br /> 67 E. 10th Street • Tracy,CA 95376 <br /> 209.833.0758 • Fax 209.832.5152 <br /> wright&nreach.com Lie. #651501 A-B Ha=Mat i^� <br /> websit hap.-Ahome.inreach.com1wright <br />