Laserfiche WebLink
Stantec <br /> Monthly Status Report - April 2013 <br /> Chevron Facility #92033 - Stockton Charter Way Commingled Plume No . CP0057 <br /> May 14 , 2013 <br /> three USTs . Former Colombo/Toscana Bakery currently consists of a warehouse building ; no <br /> USTs or fuel dispensers are present on the property . The United Gas - branded service currently <br /> consists of a station building , a car wash , four fuel dispenser islands , and four USTs . The Site <br /> lies at an elevation of approximately 12 feet (ft) above mean sea level on flat terrain . The area <br /> surrounding the Site is of mixed residential and commercial use . <br /> Sensitive Receptors <br /> There are no known water wells within one quarter mile of the Site . The nearest surface water <br /> body is the Mormon Slough , located approximately 2 , 800 ft to the north- northeast and down - <br /> gradient of the Site . <br /> Monitoring and Sampling <br /> Blaine Tech Services , Inc . ( Blaine Tech ) of Sacramento , California performed the semi -annual <br /> groundwater monitoring and sampling event from April 22 to 25 , 2013 , <br /> Current Assessment Activities <br /> No assessment activities were conducted during April 2013 , <br /> Remediation Status <br /> The construction of the AS/SVE remediation system at Chevron Facility #92033 was completed <br /> on February 15 , 2013 , The SVE system was operated on March 14 , 2013 for initial startup vapor <br /> sampling under the supervision of San Joaquin Valley Air Pollution Control District ( SJVAPCD) <br /> personnel and was shut down pending SJVAPCD Authority to Construct (ATC ) compliance <br /> verification . On April 2 , 20133 City of Stockton completed the final building inspections on the <br /> AS/SVE remediation system . <br /> SVE System Description <br /> The SVE system consists of six vapor extraction wells (VE- 1 through VE -6) and a Product <br /> Recovery Management of Durham , North Carolina ( PRM ) vapor extraction and thermal - catalytic <br /> oxidizer system . The PRM SVE system includes an 80 gallon moisture separator tank , 3/4- hp <br /> transfer pump , a 10- hp positive displacement main blower , and a 1 - hp combustion blower <br /> housed in a sound enclosure and a skid - mounted thermal- catalytic oxidizer capable of <br /> processing flow rates up to 300 standard cubic ft per minute ( scfm ) with a 440 , 000 British <br /> thermal units ( Btu ) per hour gas burner and a 15 . 5 ft high stack . The main blower extracts soil <br /> vapors from the vapor extraction wells through the moisture separator tank . Liquid collected in <br /> the moisture separator tank will be transferred periodically into a 55- gallon drum or a truck- <br /> mounted tank using the transfer pump . The thermal - catalytic oxidizer uses natural gas as <br /> supplemental fuel to treat extracted soil vapors prior to emission to the atmosphere under <br /> SJVAPCD ATC No , N - 8790- 1 - 0 . <br /> SVE System Operation <br /> Stantec restarted the SVE system on April 2 , 2013 for continuous operation after verifying that <br /> the results of the initial vapor sampling on March 14 , 2013 complied with the SJVAPCD ATC <br /> requirements . Stantec replaced the main blower oil on April 26 , 2013 as part of the system <br /> O & M schedule . The SVE system operated continuously without issue through the month of <br /> April 2013 . Field notes and field parameter readings including flow rates , vapor concentrations , <br /> vacuums , pressures , and temperatures are summarized in Table 1 and are included in <br /> Attachment B . <br /> Stockton Charter Way Commingled Plume Monthly Status Report - April . doc 2 <br />