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i4 0 WATER DISPOSAL <br /> Mr Larry Williams at the City of Stockton Department of Municipal Utilities was contacted <br /> regarding permission to dispose of the drummed water in the city sewer system Permission <br /> was granted on December 13, 1993 A sewer access was located on Rose Marie Lane, and <br /> the water was disposed of on January 13, 1994 <br /> r 5.0 CONCLUSIONS AND RECOMMENDATIONS <br />■ During the first quarter of 1993, the initial sampling, MW-1 contained the greatest <br />` concentrations of hydrocarbons (TPH as gasoline 540 ppb) However, concentrations <br /> decreased significantly the following quarter (120 ppb, 5-13-93) and no petroleum <br /> hydrocarbons were detected in MW-1 during the last three monitoring events (see Table 3) <br /> This decreasing trend can also be seen in MW-2 and MW-3 All constituents in each of the <br /> monitoring wells have decreased steadily during the past three monitoring events TPH in <br /> MW-2 has decreased from 130 ppb to 51 ppb, only 1 ppb above the reporting limit In MW- <br /> 3, TPH concentration has decreased from 62 ppb to ND (None Detected) BTE&X <br /> concentrations have shown similiar decreases <br /> Early fluctuations in the petroleum hydrocarbon concentrations may have been due to a <br /> changing gradient or atypical groundwater elevation changes Therefore, since petroleum <br /> hydrocarbon concentrations in gioundwater are relatively low and, in fact, decreasing, we <br /> do not recommend any active remediation of the groundwater at this time However, <br /> quarterly groundwater monitoring and sampling should continue <br /> Petroleum hydrocarbons are still present at the site and could pose a threat to groundwater <br /> I in the future should groundwater begin to rise GeoAudit recommends the preparation of <br /> a Soil Remediation Plan to mitigate the residual petroleum hydrocarbons in the soil at the <br /> site <br /> d 0 LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily <br /> exercised by environmental consultants practicing in this or similar localities The findings <br /> were based upon analytical results provided by an independent laboratory No other <br /> warranty, expressed or implied, is made as to the professional recommendations contained <br /> in this report <br /> c�irs�i nuasN�. rrsrs <br /> 1 614 6 941Am MMan OM 2 <br />■! r <br />