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Y � <br /> California Regional Water Quality Control Board °r -, <br /> Central Valley Region . ;` % <br /> Robert Schneider,Chair Gray Davis <br /> Winston H.Hickox <br /> Secretaryfor Sacramento Main Office Governor <br /> Environmental Internet Address: http://www.swrcb.ca.gov/-rwgcb5 <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)255-3000•FAX(916)255-3015 <br /> i <br /> 23 April 2002 A PP� 3 Q 21-'2 <br /> r . <br /> Mr. James Mills and Ms. Karen Giacopuzzi <br /> Westrec Properties <br /> 14900 West Highway 12 <br /> Lodi, California 95242 <br /> FOURTH QUARTER 2001 GROUNDWATER MONITORING REPORT AND 2001 ANNUAL <br /> REVIEW, AND SITE EVALUATION LETTER, TOWER PARK MARINA, SA1�JOAQUIN <br /> COUNTY <br /> We have reviewed the Fourth Quarter 2001 Groundwater Monitoring Report and,2001 Annual Review <br /> (Report) and the Site Evaluation Letter(Letter) from SECOR International, Inc. (SECOR) submitted on <br /> behalf of P.S. Marina Investors I (Marina) for the Tower Park Marina, respectively dated 29 January <br /> 2002 and 20 March 2002. <br /> The Report provides the analytical results of four quarters of groundwater monitoring during 2001. <br /> Groundwater was analyzed for total petroleum hydrocarbons, as gasoline (TPH-g) and as diesel (TPH-d), <br /> benzene-toluene-ethylbenzene-xylenes (BTEX), and fuel oxygenates including methyl tert butyl ether <br /> (MtBE). Maximum concentrations included 4,600 gg/L(TPH-g), 26,000 µg/L (TPH-d), and 1 µg/L <br /> (xylenes). Historically,TPH-d and TPH-g concentrations in monitoring wells MW-3 and MW-4 have <br /> varied up to three orders of magnitude, from 2000 to the present. MtBE has been consistently detected <br /> in MW-2 and MW-3 at concentrations less than 5 µg/L, since fuel oxygenates testing was initiated in <br /> September 2000. <br /> The Report states that use of.a hydrophobic hydrocarbon absorbent sock (sock) has reduced free product <br /> levels in monitoring well MW-3 to the point that no free product is observed in groundwater. The sock <br /> is changed out when saturated by petroleum hydrocarbons or bi-weekly. After using the sock(s) since <br /> September 2000, Marina personnel described the groundwater in MW-3 as having changed in color from <br /> yellow to clear. <br /> The Report states that (1)groundwater flow is away from Potato Slough (a loosing stream)under the <br /> levee, (2) the plume is stable due to a lack of detected BTEX and a decrease in petroleum hydrocarbons, <br /> and (3) natural attenuation is reducing subsurface contaminant concentrations. Flood plain deposits of <br /> clays, peat and silts influence the geology of the site. The levee was constructed of native clay, and is <br /> considered very unstable and likely to fail by the US Army Corps of Engineers (USACE). The surface <br /> water level of Potato Slough varies seasonably, and is generally about ten feet higher that the adjacent <br /> land. <br /> California Environmental Protection Agency <br /> (a Recycled Paper <br />