Laserfiche WebLink
�ATC <br /> 1117 Lone Palm Avenue Suite B <br /> (: <br /> Modesto, CA 95351 <br /> www.atcassociates.com V <br /> n 209-579-2221 <br /> A s s o c I A T E s i N c . jfFax 209-579-2225 <br /> Environmental,Geotechnical and Materials Engineers L/ <br /> January 12, 2006 .44PJ 1 7 <br /> 2006 <br /> + 54.26874.0001 <br /> i ENVIRONF4?ENT HEALTH <br /> PERMIT/SERVICES <br /> Ms. Margaret Lagorio <br /> San Joaquin County Environmental Health Department <br /> 304 E. Weber Street, Third Floor <br /> I Stockton, CA 95202 <br /> k <br /> Subject: Workplan for Additional Subsurface Investigation at Jay's Mini Mart, 3302 North West <br /> 1 Lane, Stockton, California <br /> Dear Ms. Lagorio: <br /> ATC Associates Inc. (ATC) has reviewed a letter issued to Mr. and Mrs. Mellrath on July 20, 2005, by the <br /> 1 San Joaquin County Environmental Health Department (EHD). The letter indicated that additional. <br /> investigation to estimate the current mass of petroleum contamination remaining in the soil may be <br /> necessary as a prelude to site closure. <br />€ <br /> In response to the EHD letter, ATC has prepared this workplan on behalf of Mr. and Mrs. McIlrath to <br /> perforin additional subsurface investigation activities at the above referenced site. 'The activities proposed rat <br /> the project site are described in detail in the tbllowing pa?-agraphs. <br /> t <br /> a <br /> .SITE. LOCATION <br /> The site is located on the east side of West Lane and the north-side of Alpine Avenue in Stockton, f <br /> California, as shown on Figure 1. The location is a gas station and-mini ;part. <br /> i <br /> BACKGROUND + <br /> I <br /> In 1997, three underground storage tanks (USTs) and associated piping and fuel dispensers were removed <br /> i from the locations shown on Figure 2. Soil samples were collected from the bottom of the tank excavation <br /> pit at approximately 24 feet below ground-surface (bgs). Analytical testing indicated the collected samples <br /> contained delectable :onceritrations of petroleum hydrocarbon cons ituents and fiiel oxygenates including; <br /> methyl tert-butyl ether(MTBE). The removed USI's were.replaced with new USTs in the same location and <br /> the excavatuon was subsequently backfilled to the ground surface. <br /> in August 2000, John P. Cummings & Associates (JPCA) advanced oae <;oil boring (SB 1) via direct push at <br /> the north end of the former northern dispenser island. The soil boring reached a depth of 25 feet bgs before � <br /> probe refusal was encountered. In September 2000,_JPCA advanced a soil boring via auger at the same f <br /> location as SB I to a depth of 53 .teet bgs. Analyses of soil samples and a groundwater sample from re-bored <br /> SM indicated that the soil samples contained detectable concentrations of MTBE and t-butanol (TBA), and <br /> the water sample contained detectable concentrations of MTBE, toluene, and total petroleum hydrocarbons <br /> as gasoline(TPHg). <br /> S!2687.9hvorkp€anslwkpin2UU5.doc 1 J <br /> I <br />