Laserfiche WebLink
swoo <br /> a d!T inion of ** <br /> ENVIRONMENTAL SOLUTIONS - •� r.fe con <br /> March 24, 1999 <br /> Project 20805-224.002 <br /> Ms. Letitia Briggs <br /> San Joaquin County Public Health Services <br /> 304 E. Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Re: Overexcavation and Soil Sampling Report Associated with the Removal of Product <br /> Delivery Lines and Dispensers, ARCO Service Station No. 5469, Located at 130 South <br /> Wilson Way, Stockton, California <br /> Dear Ms. Briggs: <br /> Pinnacle Environmental Solutions, a division of EMCON (Pinnacle), is submitting this report <br /> documenting overexcavation and soil sampling activities associated with the removal and <br /> replacement of product delivery lines and dispensers at ARCO Products Company (ARCO) <br /> Service Station No. 5469, located at 1.30 South Wilson Way, Stockton, California (see Figure 1). <br /> Overexcavation and soil sampling activities were observed by Letitia Briggs and Ron Rowe of <br /> San Joaquin County Public Health Services (SJCPHS). Soil sampling was conducted during the <br /> product piping upgrade activities in February, 1999. <br /> SOIL SAMPLING AND ANALYSIS <br /> On February 11, 1999, a Pinnacle geologist collected 16 verification soil samples from beneath <br /> the former product delivery lines and dispensers at the locations shown on Figure 2. Dispensers <br /> and product delivery lines in the vicinity of the pump islands had been previously removed. Soil <br /> samples were collected adjacent to dispensers and every 20 linear feet of product line (or at <br /> piping joints) under the direction of Letitia Briggs of SJCPHS. Product lines were located 2 to 4 <br /> feet below ground surface (bgs). Samples were collected at depths ranging from 3.3 to 5.5 feet <br /> bgs using hand operated percussion sampling equipment fitted with a brass sample tube. Sample <br /> tubes were removed from the sampler, sealed with Teflon tape and plastic end caps, labeled, <br /> and placed on ice pending transport to the analytical laboratory. Soil samples were field screened <br /> for the presence of petroleum hydrocarbons using a flame-ionization detector (FID). Samples <br /> were placed in resealable plastic baggies and left in a warm atmosphere. After approximately 15 <br /> minutes, which is generally sufficient for volatiles to escape from the soil, the FID probe was <br /> inserted into the baggic. The total volatile hydrocarbons present were detected by the FID and <br /> reported in parts per million. <br /> Soil samples were transported, with chain-of-custody documentation, to Sequoia Analytical, a <br /> state-certified analytical laboratory, and analyzed for total petroleum hydrocarbons as gasoline <br /> CP\E:IARCO\54691REPORTS15469P 102.DO C-9511sg:1 <br /> 3939 Cambridge Road,Suite 220 Cameron Park,California 95682 (530)676-6B84 (530)676-6885 Fax <br />