SITE INFORMATION AND CORRESPONDENCE CASE 2

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California Regional Water Quality Pontrol Board Central Vallev Region 7 i Winston H.Hickox Robert Schneider,Chair Secretaryfor Gray Davis Environmental Sacramento blain Office Governor Protection Internet Address: http://www.swrcb.ca.gov/—rwgcb5 3443 Routier Road,Suite A,Sacramento,California 95327-3003 Phone(916)255-3000•FAX(916)255-3015 2 August 2001 Mr. Mike Brown, President �? Oakwood Lake Resort 874 E. Woodward Avenue Manteca, CA 95337 CONDITIONAL APPROVAL OF GROUNDTVA TER SAMPLING WORKPLAN, MANTECA, SAN JOA QUIN COUNTY I have reviewed the "Proposed Groundvvater Sampling TVorkplan, " prepared by Holdrege & Kull, dated 15 July 2001. The plan was prepared in response to Waste Discharge Requirement Order No. 5-01-113, Provision G.Lb. After reviewing the workplan, I have the following comments: — The proposal to disinfect the monitoring wells one time is acceptable. You should develop the wells, if needed, prior to pouring the disinfectant solution into the well. Mix the disinfectant with a sufficient amount of water to ensure the disinfectant reaches the saturated zone. Use a tool to surge the disinfectant solution into the sand pack. — Please prepare a summary table that lists the sample container, preservatives, and allowable holding times for all the analytes. Note that the total coliform organisms analysis requires a specially cleaned, sealed sample container that must be provided by the analytical laboratory. — Because well disinfection is planned, the wells shall be sampled for trihalomethanes during the first sample event. It is noted that the wells installed in the proposed wastewater application area, and other wells installed around Oakwood Lake are not included in the monitoring well sampling plan. Inclusion of those wells in the monitoring network for the existing treatment system addressed by Waste Discharge Requirements Order No. 5-01-113 is not required at this time. For planning purposes, you will need to provide a minimum of four quarters of monitoring data from the wells in the proposed expanded wastewater system Report of Waste Discharge. The workplan is approved on the condition that the above comments are addressed in an addendum letter to be submitted prior to disinfection and sampling activities. California Environmental Protection Agency cla Recycled Paper The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. For a list of simple ways you can reduce demand and cut your energy costs,see our Web-site at hap://\tww jRTcb.ca.9ov,'RVgc1b5