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* amnion <br /> '433 North Market 5c evard • Sacramento California 95834 1943 • (914)928-3300 • Fox(9€6)928 3347 <br /> PAYMENT <br /> ECEIVED May 1, 1995 <br /> t4 Ay I �� Project OF90-002 04 <br /> SAN 10;QI ,y, <br /> PH-l€C 1:. <br /> Mr George Takemori F 1,V1 RON 4 <br /> A Teichert & Sons, Inc. <br /> Equipment Ad€runi,,trator <br /> P O Box 15002 <br /> Sacramento California 95551 <br /> Re Workplan for Air Sparge Well Installation at Teichert Property 103 North E Street <br /> Stockton California <br /> Dear Mr Takemon <br /> At the request of A Teichert & Sons, Inc (Teichert) EMCON is submitting this workplan to <br /> install one air sparge well at the above referenced site to increase removai of dissolved <br /> hydrocarbons and increase the etticiency of the catalytic unit at the site <br /> BACKGROUND <br /> Two 5,000-gallon gasoline underground petroleum storage tanks (UST's) and one 1,000-gallon <br /> Waste-oil UST were removed from the Teichert equipment site in October 1986 (EMCON, Problem <br /> Ati wvment Report and Final Remediation Plan, December 16, 1992) These tanks were not replaced <br /> In September 1997, o�,erexcavation of the impacted soil near the former tank complex was <br /> completed Based on safety and sidewall stability considerations, the overexcavation was <br /> terrrunated at a depth or approximately 38 feet As a result, residual concentrations of petroleum <br /> hydrocarbons remained in soil at the north-central side of the excavation where the pump island <br /> was located, at the bottom (38 feet) center of the tank excavation, and near the northwest corner <br /> of the excavation <br /> In Augu%t 1088 a 10 000-gallon-capacity regular gasoline storage tank was removed (EMCON, <br /> Problem Assessment Report and Final Remediation Plan, December 16, 1992) Two soil samples <br /> were collected from the tank excavation for chemical analysis One of the samples contained detectable <br /> concentrations of benzene toluene. ethylbenzene, and xylenes (BTEC{} BTEX was not detected in the <br /> other sample, and total petroleum hydrocarbons as gasoline (TPHG) was not detected m either sample <br /> In September 1989, the area was overexcavated Confirmation soil samples were collected from the <br /> bottom of the excavation Petroleum hydrocarbon% were not detected in any of the confirmation soil <br /> Samples Collected during irus overercavation activity <br /> 1,ACNYJ(WF9f0F900020 4AS-95 PAS 2 <br />