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RECIJIVEp <br /> OCT 2 5 2012 <br /> v Mni H __ <br /> .7 .�- o <br /> Water Boards ENVIRONMENTAL HEALTH <br /> Central Valley Regional Water Quality Control Board <br /> 24 October 2012 <br /> Mr. Jay Utal <br /> Nextbay Properties, LLC <br /> 3000 Danville Boulevard <br /> Alamo, CA 94507 <br /> WORK PLAN REQUEST, TRAILS OF MANTECA, 2368 EAST WOODWARD <br /> AVENUE, MANTECA, SAN JOAQUIN COUNTY <br /> Regional Water Quality Control Board, Central Valley Region (Central Valley Water <br /> Board) staff reviewed your 14 April 2008 Phase I & Limited Phase II Environmental Site <br /> Assessment and your 29 April 2008 Summary of Soil Excavation Monitoring Activities <br /> written on your behalf by TERRASEARCH, Inc. (TERRASEARCH). Your current <br /> consultant, ENGEO, Inc., submitted the documents to the Central Valley Water Board <br /> for us to evaluate if additional groundwater investigation is needed following the 2008 <br /> excavation of hydrocarbon impacted soil beneath an above-ground storage tank (AST). <br /> The subject site is comprised of one parcel totaling approximately 237 acres located at <br /> 2368, 20601 and 20611 Woodward Avenue, Manteca. In 2008, the site was occupied <br /> by five structures, one trailer home, an almond orchard, alfalfa fields, irrigation system, <br /> farming equipment, two portable ASTs, an abandoned fuel pump, and a collection of <br /> debris. The site is adjacent to East Woodward Avenue and Oakwood Shores <br /> residential development to the north; Walthall Slough, an irrigation ditch and a field of <br /> seasonal crops (oats) to the south; open land and an oat field to the east; and South <br /> Woodward Avenue, Weatherbee Lake, a portion of Oakwood Shores development, and <br /> residences to the west. <br /> Depth to groundwater beneath the site ranges from 11 to 18 feet below ground surface <br /> (bgs). Localized groundwater flows toward the northwest. Based on Environmental <br /> Data Resources (EDR) information dated April 8 and 11, 2008, no USGS water well <br /> was identified within a 0.25-mile radius of the site. <br /> In 2005, one soil boring, B3 was advanced beneath the 300-gallon diesel tank <br /> immediately north of the warehouse. Three (3) soil samples were collected (63-1, B3- <br /> 2.5 and 63-4). In addition, boring AST1 was advanced to 12.5 feet bgs immediately <br /> adjacent to the AST. Two soil samples and one grab groundwater sample was collected <br /> from the AST1 boring. Soil samples collected from boring B3 reported elevated <br /> concentrations of total petroleum hydrocarbons as gasoline (TPHg) ranging from 150 <br /> milligrams per kilogram (mg/Kg) to 350 mg/Kg in all soil samples. Additionally, low <br /> concentrations of xylenes, polychlorinated biphenyls (PCBs), and other volatile organic <br /> compounds were detected in some of the soil samples. Groundwater <br /> sample <br /> results 000 <br /> from the AST1 boring contained 2,000 micrograms per liter (pg/L) g, <br /> Kna. 6. Lwac;u, SCD. P.E. CrXi I PAM[LF C. CRCEDD�! P.C.. C30CC, EXECUTIVE ..vice' <br /> 1 f rlvH#200.H'111'111Cnlhnva C/ 150]0 '.'^'v nrY, a«1c .1v/cenlr.11vallcy <br />