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' - - _ Ami tip`i` 1 "4 w.rd.._:.n�........... -.,,__-- ---�if.i�-i+. r .. f-r-.--,..,-•--- -- <br /> 1 y , <br /> 01 May 2000 <br /> AGE-NC Project No 95-0121 <br /> ' Page 2 of 7 <br /> ' 2 2 GROUND WATER SAMPLING <br /> Following well purging,ground water levels in the wells achieved a minimum of 80 percent recharge <br /> ' prior to sample collection Ground water samples were collected from the purged wells utilizing <br /> new, disposable polyethylene bailers and three 40-m1 EPA-approved VOA vials containing 0 5 ml <br />' 18% hydrochloric acid as a sample preservative Care was taken to ensure that visible air bubbles <br /> were not present in the vials after filling and capping Ground water sample containers were Iabeled <br /> with the well designation, date, time, and sampler's arutaals <br /> 23 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> Each ground water sample was logged on a chain-of-custody form, placed in a chilled container and <br /> transported to a California Department of Health Services (DHS)-certified laboratory for analysis <br />' for <br /> Total petroleum hydrocarbons quantified as gasoline (TPH-g) by EPA Method 8015M, and <br /> M - Volatile aromatic compounds (benzene, toluene, ethyl benzene and xylene BTEX) with <br /> methyl-tertiary butyl ether (MTBE) by EPA Method 8020 <br />' 3.0. SOIL VAPOR EXTRACTION/IN-SITU AIR SPARGE PROCEDURES <br /> On 15 February 2000, SVE remediation was initiated at the site by a vacuum to wells VW-1,VW-3, <br /> VW-4, VW-5, VW-6, VW-7, VW-8 and VW-9 utilizing a regenerative vacuum blower and two 55- <br /> gallon carbon canisters, during this time, IAS remediation was initiated at the site on wells AW-1, <br /> AW-2, AW-3, AW-4 and AW-5 SVE and IAS procedures for the site were described in a <br />' modification letter dated 04 February 2000, prepared by AGE and approved by the PHS-EHD by <br /> letter on 07 February 2000 <br /> 3 1 SOIL VAPOR EXTRACTION/IN-SITU AIR SPARGE SYSTEM PROCEDURES <br /> Between 15 February 2000 and 31 March 2000, the SVE and IAS remediation systems were <br /> operational at the site The SVE system utilized a regenerative vacuum blower and two 55-gallon <br /> carbon canisters Two-inch diameter, schedule 80 PVC piping was installed underground from each <br /> well-head at wells VW-1, VW-3, VW-4, VW-5, VW-6, VW-7, VW-8 and VW-9 to the inlet of the <br /> regenerative vacuum blower, the outlet from the vacuum blower was routed through two sequential <br /> 55-gallon carbon canisters A Magnehelic vacuum gauge was attached to the inlet of the blower The <br /> Advanced GeoEnn ironmental,Inc <br />