WORK PLANS_FILE 1 - Laserfiche WebLink

Home Browse Search

The work plan, which,was submitted in March, proposed installing two 6-inch diameter extraction wells and screenipg them from 38 to 53 feet. During the subsequent pumping test, these two wells and VM-2 would be tested. This plan was approved by EHD in April. Due to financial reasons, Valley Motors was unable to proceed with the work for several months. During this time, groundwater monitoring continued, and in the Third Quarter 2008 Report we concluded that "In view of the stable groundwater flow direction and hydrocarbon plume and the State's current financial problems that are affecting the ability of Responsible Parties to receive reimbursement from the Underground Storage Tank Cleanup Fund,the most prudent course of action is to confine the scope of work to regular groundwater monitoring for the immediate future." In a letter dated October 9, EHD directed Valley Motors to proceed immediately with the groundwater extraction test as proposed in the March work plan. After conferring with Mr. O'Neill, Upgradient Environmental determined that it is financially impossible to proceed with that work plan. A letter dated November 12 was forwarded to EHD informing EHD of the financial situation. On February 6, a meeting was held at the EHD office to discuss future work. A modified groundwater extraction test was agreed to. Therefore, Mr. O'Neill has directed Upgradient Environmental to implement the recommendation made in the Fourth Quarter 2006 Report: perform a limited extraction test on monitoring well VM-2 only. In accordance with that recommendation, a plan to conduct a groundwater extraction test in VM-2 is described in the following paragraphs. 2.0 PROPOSED PUMPING TEST 1) A 500 to 1,000 gallon storage tank will be mobilized to the site and temporarily 10 connected to VM-2. 2) A water sample will be collected from the well to establish a baseline concentration. The sample will be preserved in a cooled ice chest for later analysis. 3) A downhole pump will be lowered into the well and the well will be pumped at an initial rate of 0.5 gallon per minute(GPM). If the well is able to sustain this rate without excessive drawdown, the rate will be increased in step-wise fashion in increments of approximately 0.25 GPM until the maximum sustainable yield is achieved. This rate will then be used in the constant-rate test, which will continue until the drawdown has stabilized or become asymptotic. A second water sample will be collected at this time: 4) Contaminated water will be processed through three 55-gallon carbon canisters and discharged into the City sewer system. To satisfy disposal requirements for the City of Stockton Sanitation District a sample will be collected from the holding tank before removal and analyzed for volatile hydrocarbons by EPA method 8260 and oxygenates. The initial processed water will remain on site