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_�_HORIZON ENVIRONMENTAL INC. <br /> Specialists in Site Assessment,Rernedial Testing,Design and Operation <br /> .lune 2, 2009 <br /> Mr. Hadin Knoll <br /> San Joaquin County Environmental Health Department <br /> 600 East Main Street <br /> Stockton, California 95202-3029 <br /> Subject: Response to Request foi• Well Disposition and Soil Gas InVestigation <br /> Abdeiwalled Facility, UltranaarNo, 13792 <br /> 2255 South Airport Way, Stockton California <br /> Mr. Knoll: <br /> At the request of Ultramar Inc., Horizon Environmental laic. (Horizon) is submitting this <br /> letter ill response the San Joaquin County Lnvironnlental Health Department (EI-ID) letter of <br /> 7 April 2009 regarding the subject site. The EFID letter included requests regarding <br /> disposition of monitoring well MI1l-12 and for a soil gas investigation work plan. <br /> The El ID acknowledged the status of monitoring well MW-12 that was covered during road <br /> COnStrUCtiOn and requested that the well be located, tither repaired or destroyed and replaced <br /> if it could not function as a monitoring well. vie El ID also stated that the property owner is <br /> considering neer building construction at the site and that a soil gas ]nvcstlgation should be <br /> conducted prior to construction. A soil gas investigation work plan was requested. <br /> Ilorizon coordinated with Vali Cooper & Associates (construction management company <br /> for the Airport Way construction project) to locate well MW-12 under concrete pavement. <br /> The 50-feet-total-depth well was found to be obstructed at approximately 26 feet below <br /> surface grade (bsg). On 7 May 2009, Horizon coordinated with All Well Abandonment (the <br /> drilling contractor that installed the well) to attempt to rehabilitate the well. Water jetting <br /> and bailing methods were utilized to remove sediment froin the well. Returning injected <br /> water was contained and totaled approximately 140 gallons. After termination of jetting, <br /> approximately 80 additional gallons of water were bailed from the well. The final depth <br /> measured in the well was approximately 47 feet bsg. The remaining obstruction in the well <br /> likely consists of coarse gravel that could not lie removed by jetting. The well will be <br /> sampled during the second quarter 2009 monitoring event. Water generated by the well <br /> rehabilitation work is stored on site in drums and will be disposed with the quarterly <br /> monitoring purge water. <br /> Ill regards to the request for a soil gas investigation work plan, at this time, (lie property <br /> owner has not secured funding for new construction and no schedule for construction has <br /> been set. horizon requests postponement of the submittal of a soil gas investigation work <br /> plan until which time the schedule for new building construction at the site becomes more <br /> certain. Additionally, soil and groundwater remediation, which includes soil vapor <br /> extraction, is ongoing. A soil gas investigation completed in the near future that docs not <br /> 4970 Windplay Drive,#C5 • EI Dorado Mills,CA 95762 • (916)939-2170 • FAX(916)939-2172 <br /> P.O.Box 5283 • Bakersfield,CA 93388 (661)589-8389 • FAX(661)589-1456 <br />