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DEC 2 3 1991 <br /> CALIFORNIA aEGIgNACJ�I QUALITY CONTROL BOARD <br /> CENTRAL` VRNtE REGION <br /> MONITORING AND REPORTING PROGRAM NO. 90-702 <br /> FOR <br /> GEWEKE LAND DEVELOPMENT AND MARKETING <br /> SAN JOAQUIN COUNTY <br /> Specific sample station locations are established under direction of the <br /> Board's staff and a description of the stations are attached to this Order. <br /> Prior to construction, plans and specifications for ground water monitoring <br /> and/or extraction wells shall be submitted to Board staff for review and <br /> approval . After construction, new wells will be added to the monitoring <br /> program as specified by Board staff. <br /> GROUND WATER MONITORING <br /> The ground water monitoring network consists of 13 monitoring wells as shown <br /> on Attachments A and B. The following shall constitute the ground water <br /> monitoring program: <br /> MW4, MW6, MW7, MW1, MW2, <br /> MW10, MW11, MW3, MWS, <br /> MW12, MW13 MWB, MW9, EW1 <br /> Type of Sampling Sampling <br /> Constituents Units Sample Freauencv Freauencv <br /> Depth to ground water Feet ---- Quarterly Quarterly <br /> Benzene µg/l Grab Quarterly Annually <br /> Toluene µg/l Grab Quarterly Annually <br /> Ethylbenzene ug/l Grab Quarterly Annually <br /> Xylene µg/l Grab Quarterly Annually <br /> TPH as gasoline µg/l Grab Quarterly Annually <br /> Lead* µg/1 Grab Annually Annually <br /> 1 ,2-Dichloroethane* µg/l Grab Annually Annually <br /> 1, 1-Dichloroethane* µg/l Grab Annually Annually <br /> Ethylenedibromide(EDB)* µg/l Grab Annually Annually <br /> * Analyses may be discontinued, with Board staff approval , if not detected. <br /> REPORTING <br /> Quarterly reports are required in Section 2652(d) of the Underground Tank <br /> Regulations, Chapter 16, Division 3, Title 23, of the California Code of <br /> Regulations. <br />